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Old 08/08/2006, 06:45 AM   #1 (permalink)
Eclipse GT 3.5 6G74
 
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3.5 6G74 Swap Discussion

very good modification
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Old 08/08/2006, 08:15 AM   #2 (permalink)
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The 6G74 and 6G72 heads are identical except for the cams and the distributor.
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Old 08/08/2006, 10:09 AM   #3 (permalink)
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Quote:
Originally Posted by Tearstone
The 6G74 and 6G72 heads are identical except for the cams and the distributor.
Some of that is true. I was looking thru caps and the blue prints for both cars. The 3.5L had different variations for the heads, more so the ignition systems. The 6G74 from a Diamante used a distributor which is different from the 6G72, however its pretty similar aside small differences. But, the the 6G74 from the Montero Sport used coil pack system, with 3 dual post coils. Now the 6G74 from the early models used a DOHC with coils, the from 01+ it used a SOHC with coils, and 03+ used a SOHC but with a different coil setup from the 01. However, the short block essentially is the same for all the SOHC models. So use the 3.5L short block and the 3G SOHC heads would work.

However, the reason for the 3.5L camshafts is simple enough, different valve clearances and opening and closing, and then the distributor needs to be changed because the 3.5L camshafts have different 'key' design and the 3G distributor would not fit.
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Old 08/08/2006, 10:13 AM   #4 (permalink)
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Quote:
Originally Posted by Clipse3GT
Some of that is true. I was looking thru caps and the blue prints for both cars. The 3.5L had different variations for the heads, more so the ignition systems. The 6G74 from a Diamante used a distributor which is different from the 6G72, however its pretty similar aside small differences. But, the the 6G74 from the Montero Sport used coil pack system, with 3 dual post coils. Now the 6G74 from the early models used a DOHC with coils, the from 01+ it used a SOHC with coils, and 03+ used a SOHC but with a different coil setup from the 01. However, the short block essentially is the same for all the SOHC models. So use the 3.5L short block and the 3G SOHC heads would work.

However, the reason for the 3.5L camshafts is simple enough, different valve clearances and opening and closing, and then the distributor needs to be changed because the 3.5L camshafts have different 'key' design and the 3G distributor would not fit.
I should have specified more clearly, the 6G74 Diamante VRX motor, the heads are identical to our Eclipse 6G72 GT motors. I'm not sure about the Monteros and what they did with those engines in there.

I would surmise that 3.5L camshafts are different because the timing belt has further to travel due to the increased height of the engine. Yes, the distributor is different due to the key in the cam, but aesthetically the distributors are different as well.
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Old 08/08/2006, 10:25 AM   #5 (permalink)
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Diamante VRX Distributor


Eclipse V6 Distributor


Eclipse V6 Head




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Old 08/08/2006, 10:52 AM   #6 (permalink)
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Pardon the interuption but what does this mean?? can we use the VRX motor in our car???
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Old 08/08/2006, 10:54 AM   #7 (permalink)
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Quote:
Originally Posted by blackgt00
Pardon the interuption but what does this mean?? can we use the VRX motor in our car???
This means that we can use the the 3.5L shortblock in our cars with our heads, but its not a direct swap of sorts there are a few things that have to be relocated or brackets have to be made for.
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Old 08/08/2006, 11:11 AM   #8 (permalink)
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3G Head, etc...









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Old 08/08/2006, 11:22 AM   #9 (permalink)
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VRX Head etc...












From what I have this seems like both engines are very similar and a direct swap would be very possible.
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Old 08/08/2006, 11:26 AM   #10 (permalink)
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Yes the SOHC 6G74 out of the Diamante is a direct swap. The only thing you run into is changing out the axle bracket in the back.

Diamante guys have been using our 5spd transmissions to do their 5spd swaps for years now.

Another note, is that if you retain the use of the Diamante Plenum you can't use the strut bar anymore, but from what it looks like the GT plenum will still clear with the strut bar still on.

BTW, where are you getting these images from, is it that one thing you were supposed to send me that time

Regardless, I can get you guys a great price on full 6G74 engines complete with exhaust intake/exhaust manifolds through one of our guys here in Florida. If anyone is interested, I am currently getting 6G74 CP pistons made and if anyone would like to jump on board for a short or long block let me know.

http://www.diamanteowners.com/forum/...howtopic=82650
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Old 08/08/2006, 11:28 AM   #11 (permalink)
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Quote:
Originally Posted by Tearstone
Yes the SOHC 6G74 out of the Diamante is a direct swap. The only thing you run into is changing out the axle bracket in the back.

Diamante guys have been using our 5spd transmissions to do their 5spd swaps for years now.

Another note, is that if you retain the use of the Diamante Plenum you can't use the strut bar anymore, but from what it looks like the GT plenum will still clear with the strut bar still on.
Well I am sure you can always purchase a different strut bar. That would clear that obstical.

As far as the axle brackets. Which ones are you talking about?
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Old 08/08/2006, 11:32 AM   #12 (permalink)
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Quote:
Originally Posted by Clipse3GT
Well I am sure you can always purchase a different strut bar. That would clear that obstical.

As far as the axle brackets. Which ones are you talking about?
The passenger side axle bolts to the mid way to the engine. That axle bracket has a different bolt configuration on the 6G74 vehicles.
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Old 08/08/2006, 11:39 AM   #13 (permalink)
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Well damn. I was planning on using a VR4 block for my build but now Im thinking about this 3.5L. How far out can this motor be bored? 3.8? 4.0!!!??

And no shit Kris where do you get those breakouts from?? I want!!!
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Old 08/08/2006, 11:41 AM   #14 (permalink)
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Okay got it, for those of you wondering what we are talking about look at the diagrams in this post of the axles and look at letter H.

VRX Bracket Kit
MR486921


3G Bracket Kit
MR470020
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Old 08/08/2006, 11:46 AM   #15 (permalink)
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Quote:
Originally Posted by McLarenross
Well damn. I was planning on using a VR4 block for my build but now Im thinking about this 3.5L. How far out can this motor be bored? 3.8? 4.0!!!??

And no shit Kris where do you get those breakouts from?? I want!!!
You know you want to do it

Dude, just putting the 6G74 in a N/A car makes a world of differnce in power. I was considering just dropping another one in the Galant I have too

I forsee this being a very popular path for future 3G owners even if your just going the N/A route.

It's best that if you guys want to start doing this, get to the junk yards now because there are 6G74s that these junkyard guys want to get rid of for super cheap. Even if you just do the direct swap it's still waaaaaay more cost effective than even buying an CAI
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Old 08/08/2006, 11:49 AM   #16 (permalink)
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No shit man. As the old addage goes, "There is no replacement for cubic inches, except more cubic inches." (I know this isnt strickly true)
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Old 08/08/2006, 11:50 AM   #17 (permalink)
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Quote:
Originally Posted by Tearstone
You know you want to do it

Dude, just putting the 6G74 in a N/A car makes a world of differnce in power. I was considering just dropping another one in the Galant I have too

I forsee this being a very popular path for future 3G owners.
There is no replacement for displacement.

Russ, this is where it is confusing I know you spoken with Dave. Which bracket do you use. The VRX A/T one in the a 3G Manual?
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Old 08/08/2006, 11:53 AM   #18 (permalink)
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Quote:
Originally Posted by Clipse3GT
There is no replacement for displacement.

Russ, this is where it is confusing I know you spoken with Dave. Which bracket do you use. The VRX A/T one in the a 3G Manual?
You don't even have to switch the bracket out, you can machine the difference down to get the 3G one to fit, but I'm just saying it's easier just to get the Diamante axle bracket (they are all A/T).
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Old 08/08/2006, 11:56 AM   #19 (permalink)
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I know this is kind of geeky to say, but I was absolutely floored when I took the oil pan off of my 74 that it was a 4 bolt main like the 6G72TT engines were.

From what I understand these might be the same engines they use in the 6G74TT




This is our 6G72 2 bolt main

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Old 08/08/2006, 11:57 AM   #20 (permalink)
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Here is some good information where about 75% documented here sort of gives you an idea of the differences. I can take more pictures of the parts if you guys want tonight.

http://wrenchmonkey.com/Webpages/6G74swap.html
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Old 08/08/2006, 11:58 AM   #21 (permalink)
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Quote:
Originally Posted by Tearstone
You don't even have to switch the bracket out, you can machine the difference down to get the 3G one to fit, but I'm just saying it's easier just to get the Diamante axle bracket (they are all A/T).
I hate dicking around with axles...

Anywho better start looking for a VRX motor, anyone know of a place that makes pistons etc... for these beside RPW?
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Old 08/08/2006, 12:00 PM   #22 (permalink)
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Quote:
Originally Posted by Clipse3GT
I hate dicking around with axles...

Anywho better start looking for a VRX motor, anyone know of a place that makes pistons etc... for these beside RPW?
I am getting CP pistons made for them right now. If you want to piggyback on my order let me know and I'll put in the call for them to make more than one set.
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Old 08/08/2006, 12:08 PM   #23 (permalink)
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Quote:
Originally Posted by Tearstone
I am getting CP pistons made for them right now. If you want to piggyback on my order let me know and I'll put in the call for them to make more than one set.
I'll let you RD this one first Probably there would be very little need to replace anything beside pistons on those motors for 500whp. And they would just need machining, balance the rods and the crank with knife edging. And cryo treat them. I think that would be sufficent for those motors.

However, I noticed they dont have oil squirters for hte pistons.
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Old 08/08/2006, 12:24 PM   #24 (permalink)
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~3.8L + 25psi would make me and
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Old 08/08/2006, 12:25 PM   #25 (permalink)
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Quote:
Originally Posted by McLarenross
~3.8L + 25psi would make me and


Can you say slicks.
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Old 08/08/2006, 12:37 PM   #26 (permalink)
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Hell yea! 600+whp
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Old 08/08/2006, 12:38 PM   #27 (permalink)
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Quote:
Originally Posted by Clipse3GT
I'll let you RD this one first Probably there would be very little need to replace anything beside pistons on those motors for 500whp. And they would just need machining, balance the rods and the crank with knife edging. And cryo treat them. I think that would be sufficent for those motors.

However, I noticed they dont have oil squirters for hte pistons.
There are oil squirters on the rods that point at the pistons

72 on the left, 74 on the right.

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Old 08/08/2006, 12:39 PM   #28 (permalink)
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Quote:
Originally Posted by Juan Soto


Um... Use photobucket or tinypic for posting pics.
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Old 08/08/2006, 12:41 PM   #29 (permalink)
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Quote:
Originally Posted by Tearstone
There are oil squirters on the rods that point at the pistons

72 on the left, 74 on the right.

Well that link you posted the dude says the 6g74 does not have oil squirters. Hmm porbably the VRX ones do.
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Old 08/08/2006, 12:55 PM   #30 (permalink)
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Quote:
Originally Posted by Juan Soto
that the serpentine is in the midle of the oil filter because in the 3.5 the oil filter is in the front of the engine.
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Old 08/08/2006, 12:56 PM   #31 (permalink)
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Quote:
Originally Posted by Juan Soto
that the serpentine is in the midle of the oil filter because in the 3.5 the oil filter is in the front of the engine.
You don't have that worry if your using all 6G74 accesory parts. You keep saying all these negative things but all you did was take a 6G74 short block and retrofit it with all of the 6G72 parts. That is not the best way to go about doing this swap.
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Old 08/08/2006, 01:06 PM   #32 (permalink)
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Quote:
Originally Posted by Tearstone
You don't have that worry if your using all 6G74 accesory parts. You keep saying all these negative things but all you did was take a 6G74 short block and retrofit it with all of the 6G72 parts. That is not the best way to go about doing this swap.

OK I have 6G74 mounted in my car your not
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Old 08/08/2006, 01:18 PM   #33 (permalink)
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Quote:
Originally Posted by Tearstone
BTW, where are you getting these images from, is it that one thing you were supposed to send me that time
Thats from the Mitsu CAPS program - I'd like to get my hands on a copy of that.
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Old 08/08/2006, 01:21 PM   #34 (permalink)
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Quote:
Originally Posted by Juan Soto
OK I have 6G74 mounted in my car your not
We have a 6G74 mounted in a car too. You don't understand what I'm trying to tell you: Usted no es el primer para hacer esto.
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Old 08/08/2006, 01:29 PM   #35 (permalink)
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Quote:
Originally Posted by Tearstone
We have a 6G74 mounted in a car too. You don't understand what I'm trying to tell you: Usted no es el primer para hacer esto.
??? Russ, Quien?
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Old 08/08/2006, 01:59 PM   #36 (permalink)
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Quote:
Originally Posted by McLarenross
??? Russ, Quien?
One of the shop cars. After a year and half of me always talking about it, they picked up a 6G74 and dropped it in one night. It was a fairly painless procedure. After I took a ride in it, I knew that's something I definitely had to do as well which is why I'm waiting on my 6G74 pistons to come back from CP

I was keeping it on the D/L, but I figure I would at least offer my expertise on the subject of doing these swaps. IMHO I think every V6 owner can afford to throw in a junkyard 6G74 into their engine bay. The manifolds even bolt up to the stock downpipe. The V6 turbo kit even bolts right up to the 6G74 cali spec manifolds.
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Old 08/08/2006, 02:12 PM   #37 (permalink)
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Quote:
Originally Posted by Tearstone
Usted no es el primer para hacer esto.
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Old 08/08/2006, 02:16 PM   #38 (permalink)
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Where is the oil filter located on a stock Diamonte? Like you say, it wouldnt be in the way of the belts. Im on the hunt for a 6G74 block now.
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Old 08/08/2006, 02:20 PM   #39 (permalink)
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Quote:
Originally Posted by McLarenross
Where is the oil filter located on a stock Diamonte? Like you say, it wouldnt be in the way of the belts. Im on the hunt for a 6G74 block now.
I'll take a picture for you later this evening, it's on the corner of the block instead of in the middle underneath the exhaust manifold like it is on our engines. Actually it's right about where the oil pump feeds oil into the block if you have ever pulled the oil pump off before.
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Old 08/08/2006, 02:22 PM   #40 (permalink)
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That makes sense. Like you said this is a pretty easy swap that will result in nice gains. And with the ECU reflash it will run right without too much of a hassle. We can just relfash our ECUs with the Diamonte ROMs.
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Old 08/08/2006, 02:24 PM   #41 (permalink)
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Quote:
Originally Posted by McLarenross
That makes sense. Like you said this is a pretty easy swap that will result in nice gains. And with the ECU reflash it will run right without too much of a hassle. We can just relfash our ECUs with the Diamonte ROMs.
They did not do anything to the ECU on this other car, it just ran right out of the box. It's a fed spec IIRC so ECU flash was not even an option on this particular vehicle.

It actually felt exactly like how my car feels when it first spools up but it's just missing something after about 4K RPMs but still quite the kick in the pants.
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Old 08/08/2006, 03:07 PM   #42 (permalink)
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How much HP does the VRX engine has??? And is it worth it to swap then???
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Old 08/08/2006, 03:25 PM   #43 (permalink)
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Quote:
Originally Posted by blackgt00
How much HP does the VRX engine has??? And is it worth it to swap then???
Engine Type 3.5-liter SOHC V6 engine
Horsepower 210 @ 5,000
Torque 231 @ 4,000

According to the results of my butt dyno, the results were quite favorable. Just think how much horsepower headers or an intake gives you. If you can pull an engine for $300~$600 and plop it in your car, you would be crazy not do do this depending on the condition of the engine when you get it.

http://www.car-parts.com
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Old 08/08/2006, 03:29 PM   #44 (permalink)
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I see them at the $1000 range, not bad will my headers,CAI,exhaust fit??? Also it has to be the 3.5 liter right?
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Old 08/08/2006, 03:33 PM   #45 (permalink)
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Quote:
Originally Posted by blackgt00
I see them at the $1000 range, not bad will my headers,CAI,exhaust fit??? Also it has to be the 3.5 liter right?
Which headers do you own? That will be critical because there is a height difference on the block which pulls up the headers a few inches, I'm worried about clearance under your oil pan. Mitsubishi made up this height difference in the manifolds. Which is why the V6 turbo kit bolts up to the stock 6G74 manifolds.

The exhaust is in the back of the car, so I don't think that will be an issue, and the CAI would fit as well.
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Old 08/08/2006, 03:40 PM   #46 (permalink)
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I own the XIR shorty headers.
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Old 08/08/2006, 03:49 PM   #47 (permalink)
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Quote:
Originally Posted by blackgt00
I own the XIR shorty headers.
When I talk to Dave tonight at RPW I'll get more details. The headers they make fit both engines so I want to see what's going on with that before I say anything final about what you can expect.
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Old 08/08/2006, 03:50 PM   #48 (permalink)
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Juan, Tearstones car does not have a 3.5 in it. It is another car that he is talking about. He has seen and ridden in the car personally.

You aren't the only one to do this.
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Old 08/08/2006, 03:58 PM   #49 (permalink)
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juan soto what numbers and time are u putting down?
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Old 08/08/2006, 04:00 PM   #50 (permalink)
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About how much HP potential are we talking about, ltes say I/H/E?
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Old 08/08/2006, 04:01 PM   #51 (permalink)
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You aren't the only one to do this.
And damn sure wolnt be the last.
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Old 08/08/2006, 04:42 PM   #52 (permalink)
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still waiting for your WHP numbers and times juan soto
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Old 08/08/2006, 04:46 PM   #53 (permalink)
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I'm not going to give in Juan's blatent lack of maturity. For anyone else that needs assistance with this upgrade you know how to get a hold of me. rsanderlin@tearstone.com
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Old 08/08/2006, 05:16 PM   #54 (permalink)
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Quote:
Originally Posted by icemanrld19
still waiting for your WHP numbers and times juan soto

At this time I do not have the WHP because I have a stage 1 in my car and I changed for stage 2, the last week I received the graybox and the software to set it with the new stage. As soon as I have the WHP I will let you know. I want to test it soon.
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Old 08/08/2006, 05:19 PM   #55 (permalink)
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Give us a favor, show me a picture of the other car that you test, I want to see it because told that you make this change and make it its different. So, I want to see the pictures...thanks
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Old 08/08/2006, 05:31 PM   #56 (permalink)
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Quote:
Originally Posted by Juan Soto
35% more HP 205HP + 35% HP = 276HP Stock
That much??? I mean isnt the 6g74 only a few Hp away from a stock gt??? I have a Fed-spec and i have 205 stock.
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Old 08/08/2006, 05:39 PM   #57 (permalink)
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Quote:
Originally Posted by blackgt00
That much??? I mean isnt the 6g74 only a few Hp away from a stock gt??? I have a Fed-spec and i have 205 stock.


I do not find that the Eclipse have 35% more HP with only change the short block for a 6G74, living all the other stock parts of the eclipse
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Old 08/08/2006, 05:45 PM   #58 (permalink)
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I mean with swap alone and a few bolt ons can we gain some extra power??? I know the 6g74 has about 231 torque instead of 205.
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Old 08/08/2006, 05:56 PM   #59 (permalink)
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Quote:
Originally Posted by blackgt00
I mean with swap alone and a few bolt ons can we gain some extra power??? I know the 6g74 has about 231 torque instead of 205.
Are you doubting that .5 more liters of displacement won't give you any extra power?
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Old 08/08/2006, 05:57 PM   #60 (permalink)
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Not at all but what Juan said going from 205 to 276 sounded a bit crazy.
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