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Old 08/21/2006, 10:24 AM   #1 (permalink)
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3.8 6G75 Swap Discussion

has anyone done any research into the 6g75 because i've found a 3.8l for not much more then then 6g74 at a scrap yard near me, if anyone has any info about what might go into the fit up id love to see it
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Old 08/21/2006, 10:53 AM   #2 (permalink)
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Quote:
Originally Posted by camoner
has anyone done any research into the 6g75 because i've found a 3.8l for not much more then then 6g74 at a scrap yard near me, if anyone has any info about what might go into the fit up id love to see it
From what I could tell when looking at the 4g, the mounts are in the same location that they are for us. The transmission on the 3G may not bolt up, but you could always get their 6-speed in that case.

If that motor is cheap enough, just buy it and try it out. If it doesnt work you could always sell it again.

EDIT: The ECU would probably need to be swapped too, in order for the MIVEC to work.
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Old 08/21/2006, 12:33 PM   #3 (permalink)
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actually, it be a very difficult swap. It is all electronically controlled. Meaning, even the throttle pedal shit is electronically controlled! You could probably use the block itself but using the rest might be a lil difficult. deck height is too tall for out engine compartment (nothing a lil after market hood cant handle, ie: raised hood) It would be very interesting to see though.
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Old 08/21/2006, 12:50 PM   #4 (permalink)
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I recall Manybreaws saying that the bellhousings fro the 4G 6-speed and the 3G 5-speed were almost identical. Even so. Id just use the 6-speed. You would need the whole wireing harness and ECU though to make it work. Its easier to just get the 3.5 and bore it out to 3.8-3.9 and do some nice head work and drop it in.
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Old 08/21/2006, 03:31 PM   #5 (permalink)
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Quote:
Originally Posted by McLarenross
I recall Manybreaws saying that the bellhousings fro the 4G 6-speed and the 3G 5-speed were almost identical. Even so. Id just use the 6-speed. You would need the whole wireing harness and ECU though to make it work. Its easier to just get the 3.5 and bore it out to 3.8-3.9 and do some nice head work and drop it in.
Is there enough material to bore it out to 3.8L???
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Old 08/21/2006, 03:35 PM   #6 (permalink)
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Russ is talking about 4.1 so i guess so.
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Old 08/21/2006, 04:04 PM   #7 (permalink)
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Quote:
Originally Posted by McLarenross
Russ is talking about 4.1 so i guess so.
4.1 strokers, not necessarily dependant upon bore but stroked out to 4.1
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Old 08/21/2006, 05:53 PM   #8 (permalink)
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True. I forgot about crank travel. What do the wall thicknesses look like to you. Think .040"-.050" over is feasible??
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Old 08/21/2006, 05:55 PM   #9 (permalink)
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Quote:
Originally Posted by McLarenross
True. I forgot about crank travel. What do the wall thicknesses look like to you. Think .040"-.050" over is feasible??
Plenty of meat on the walls of all the Mitsu 6 cylidners I've come accross. It's the 4cylinders that you have to be careful about.
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Old 08/22/2006, 02:03 PM   #10 (permalink)
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but think of wat you can do with a 3.8L if you bore it , the thing is the electronics, do you think there would be a way to either keep something from my engine so I dont have to deal with it, or basically would i be driving a 4g in a 3g body?
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Old 08/23/2006, 09:49 AM   #11 (permalink)
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Quote:
Originally Posted by camoner
but think of wat you can do with a 3.8L if you bore it , the thing is the electronics, do you think there would be a way to either keep something from my engine so I dont have to deal with it, or basically would i be driving a 4g in a 3g body?
I would talk to some of the guys at RPW about this. They seem to know the 6G7X platforms extremely well. I could be wrong, but I think they have setup standalone computers on Mivec engines. I don't see any reason why you couldn't do the same with some of their help.
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Old 08/23/2006, 11:34 AM   #12 (permalink)
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why not just use the 3.8L block and 3G heads or even 3.5L heads?
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Old 08/23/2006, 11:45 AM   #13 (permalink)
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Quote:
Originally Posted by McLarenross
I recall Manybreaws saying that the bellhousings fro the 4G 6-speed and the 3G 5-speed were almost identical. Even so. Id just use the 6-speed.
I am no transmission guru, but wouldn't you then need custom length axle's? The tranny may bolt up to the engine, but what about all the rotating stuff?
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Old 08/23/2006, 11:48 AM   #14 (permalink)
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Quote:
Originally Posted by TheFranchise
why not just use the 3.8L block and 3G heads or even 3.5L heads?
will they match up to the 3.8L block?

And correct me if I am wrong, but most of the 3.8's hp and tq gain over the 3.5 and the 3.0 is from the MIVEC technology right? I know you'd still get a gain from the displacement change, but you wouldn't be getting the whole shabang, so to speak. Right?
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Old 08/23/2006, 11:51 AM   #15 (permalink)
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Swapping the ecus and electronics should take care of the MIVEC technology issue.
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Old 08/23/2006, 11:59 AM   #16 (permalink)
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Quote:
Originally Posted by randyrat
Swapping the ecus and electronics should take care of the MIVEC technology issue.
While it will take care of the Mivec issue, someone stated earlier in this thread that alot of stuff on the 4G is electronically controlled. Specifically, the throttle pedal. If that is the case, I would assume that the gas pedal has some sort of sensor on it to see how far down the driver has pushed it. The sensor relays that information to the ECU, and the ECU then relays that information to some tiny motor attached to the throttle body that opens it up a certain percentage based on the input from the ECU.

I read an article a while ago about this "drive by wire" technology and how alot of car companies are starting to implement similar stuff. I am not sure if Mitsu did this or not, but someone Dragon34x seems to think so. Who knows?
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Old 08/23/2006, 02:03 PM   #17 (permalink)
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yup the 4g uses drive by wire shit.
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Old 10/03/2006, 09:58 PM   #18 (permalink)
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I own a 2006 G6 that uses a lot of drive-by-wire technology and happen to work at a pontiac dealership as well, it's some crazy looking shit to get involved with, so I'd be careful...but, where there's a will, there's a way and the you said the engine was cheap anyway.
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Old 10/03/2006, 10:49 PM   #19 (permalink)
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cheap engine doesnt mean much, you know the formula time v. money
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Old 10/03/2006, 11:36 PM   #20 (permalink)
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the solution is pretty simple. and it can be done since the 4g has been out for a while now, you find a 4g that was totaled in a rear end accident. and some minor stuff in the front. buy the car and you now have a donor car. If I was going to do a MIVEC swap, thats is exactly what I would do.
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Old 10/04/2006, 08:40 AM   #21 (permalink)
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Word on the street is that the 3.8L in the 4G has a non returnable fuel system. The 4G has a real uphill battle for forced induction.
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Old 10/05/2006, 11:16 PM   #22 (permalink)
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Old 10/06/2006, 07:13 AM   #23 (permalink)
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Quote:
Originally Posted by Slippercream
Excuse me?
Mike W. at RRE stated that you can't use an FMU on the 4G without building the return line to go back into the gas tank. Not that I'm an advocate of an FMU type system anyways but still. They used a lot more technologly on the 4G than they did with the 3G. Also the ECU is not the same either, the ECU Flash does not work on it.
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Old 10/06/2006, 12:17 PM   #24 (permalink)
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Quote:
Originally Posted by Tearstone
Word on the street is that the 3.8L in the 4G has a non returnable fuel system. The 4G has a real uphill battle for forced induction.

why does that make it harder? who give a fawk about returned fuel?
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Old 10/09/2006, 12:42 AM   #25 (permalink)
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I DO! That explains how this car gulps so much fuel like it's free bottomless Mojitos on bitches' night!

So will running a return line back into the tank really be necessary? Ross and I were talking about just using the Ultimate for a simple solution anyway. Fuel return or not, the variances won't really matter that much if you're limiting fuel by injector pulse, I'd think.
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Old 10/09/2006, 01:01 AM   #26 (permalink)
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Quote:
Originally Posted by Slippercream
I DO! That explains how this car gulps so much fuel like it's free bottomless Mojitos on bitches' night!

So will running a return line back into the tank really be necessary? Ross and I were talking about just using the Ultimate for a simple solution anyway. Fuel return or not, the variances won't really matter that much if you're limiting fuel by injector pulse, I'd think.
Nah, not having a return fuel line does not really create any problems if you know how to properly setup a car for fuel
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Old 10/09/2006, 01:01 AM   #27 (permalink)
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Fuel? What's that?

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Old 11/08/2006, 12:58 PM   #28 (permalink)
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anyone know if the new 3.8L gt engine will fit into the 3g gt??

my mitsu tech says it "will not fit"
others are telling me otherwise

can anyone please offer advice?

thanks!
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Old 11/08/2006, 01:25 PM   #29 (permalink)
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anything fits just needs shitload of work just do it
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Old 11/08/2006, 04:47 PM   #30 (permalink)
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The block will go in Im pretty sure. As for the exhaust manifolds.....No. The 4G rear manifold is worse that the 3G rear manifold.
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Old 11/08/2006, 04:51 PM   #31 (permalink)
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You also will most likely encounter problems fitting that intake manifold in the engine bay. As it is, the 3G engine bay is much more cramped than that of the 4G. You may have to custom-fab one that won't come so close to the firewall.
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Old 11/08/2006, 05:20 PM   #32 (permalink)
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I wonder if this is indeed feasible, if the 3g will then suffer from the GODAWFUL torque steer the 4g has?
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Old 02/25/2007, 06:07 PM   #33 (permalink)
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Where did He say that this was a 3.8L MIVEC engine? Mitsu makes a 215 HP 3.8 liter engine in the motero. I'm pretty sure that that is a 6G75, and that it shouldn't be any harder to put into the eclipe then the 6g74.
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Old 02/25/2007, 06:08 PM   #34 (permalink)
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Where did He say that this was a 3.8L MIVEC engine? Mitsu makes a 215 HP 3.8 liter engine in the motero. I'm pretty sure that that is a 6G75, and that it shouldn't be any harder to put into the eclipe then the 6g74.
Really? Is this a Montero/Pajero outside of the US?
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Old 02/25/2007, 06:24 PM   #35 (permalink)
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the 2005 and later Montero switched to a 3.8 liter engine.

http://media.mitsubishicars.com/deta...60619&mime=ASC
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Old 02/25/2007, 06:26 PM   #36 (permalink)
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the hp gain isn't all that much, but 50 extra pound feet of torque would be nice. If I had to guess I would say that fitting the exhaust manifolds into the 3g would be a bitch. There's barely enough room for the crappy rear exhaust manifolds that the car comes with.
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Old 02/25/2007, 06:36 PM   #37 (permalink)
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http://media.mitsubishicars.com/deta...52825&mime=ASC
I guess it runs on regular gas too? Nice, It'd be nice to see what this motor could do with headers, an intake, and tuning for premium gasoline.
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Old 02/25/2007, 06:45 PM   #38 (permalink)
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the 2005 and later Montero switched to a 3.8 liter engine.

http://media.mitsubishicars.com/deta...60619&mime=ASC
That's great news for those owners, lots of aftermarket support on the way for everyone
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Old 03/05/2007, 11:22 AM   #39 (permalink)
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Would anyone here happen to know what size injectors come on the galants 6G75? Also. . . would ya happen to know what impedence they are?
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Old 03/05/2007, 11:53 AM   #40 (permalink)
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Would anyone here happen to know what size injectors come on the galants 6G75? Also. . . would ya happen to know what impedence they are?
That is the non-mivec engine right?
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Old 03/05/2007, 05:36 PM   #41 (permalink)
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Right. . . it'd be nice to have the info for both too.
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Old 03/05/2007, 05:55 PM   #42 (permalink)
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At the risk of being really flamed if it has been posted already, I put this up on the other site and I'd like to hear what y'all think.

Have any of you considered putting the AWD sporty transmission from the magna on the 'clipse? It bolts up to the 6G74.

I did a quick search and didn't see anything about it. If it's a dead horse, go ahead and flame me.
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Old 03/07/2007, 04:27 PM   #43 (permalink)
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I didnt find anything. . .

anyone here got the info?
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Old 03/07/2007, 04:43 PM   #44 (permalink)
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With people spending thousands on mods, I have to think that someone is crazy enough to spend the money to import that tranny.
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Old 03/07/2007, 09:34 PM   #45 (permalink)
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oh, i was talking about the injectos . . . .
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Old 03/07/2007, 10:16 PM   #46 (permalink)
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i'd really enjoy someone giving this a try for the rest of us, because a guy down here ran 13.8 bone stock on an 4g GT

i'm wanting to see what it will do in a smaller chassis
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Old 03/07/2007, 10:23 PM   #47 (permalink)
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Would love to see this dream come true, it could be a one-of-a-kind.
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Old 03/10/2007, 09:42 AM   #48 (permalink)
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Anyone with info on the INJECTORS!!! . . . need to know asap, cuz i got a pretty good chance to buy some for cheap if they are around the size that i will need!
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Old 07/30/2007, 01:41 AM   #49 (permalink)
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These engines are getting cheaper... Someone needs to get the dimensions and compare them to the 6G72 Dimensions so we have an idea of fitting in the engine bay. I'm looking at swaps simply because displacement is key if these cars are ever going to be up there speed wise.
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Old 07/30/2007, 02:09 PM   #50 (permalink)
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It's already been proven that it will fit, but very tightly.
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Old 07/30/2007, 02:50 PM   #51 (permalink)
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At the risk of being really flamed if it has been posted already, I put this up on the other site and I'd like to hear what y'all think.

Have any of you considered putting the AWD sporty transmission from the magna on the 'clipse? It bolts up to the 6G74.

I did a quick search and didn't see anything about it. If it's a dead horse, go ahead and flame me.

i'd do it if i knew it worked!
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Old 07/30/2007, 04:29 PM   #52 (permalink)
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I'll be attempting this once i come back from Iraq next year. . . . Possibly even be throwing in the 6speed tranny too. . . .but until then. . . anyone else wanna step up?
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Old 07/30/2007, 04:30 PM   #53 (permalink)
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I'll be attempting this once i come back from Iraq next year. . . . Possibly even be throwing in the 6speed tranny too. . . .but until then. . . anyone else wanna step up?

I'ma stick to my Diamante swap for now
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Old 07/31/2007, 05:36 AM   #54 (permalink)
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I'll be attempting this once i come back from Iraq next year. . . . Possibly even be throwing in the 6speed tranny too. . . .but until then. . . anyone else wanna step up?


you gotta let me know if this works! = -)
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Old 07/31/2007, 04:14 PM   #55 (permalink)
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So the axles with line up? If not couldn't you always use the 4g axles and Diff and just swap that in too when you put in the engine??
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Old 08/01/2007, 04:25 PM   #56 (permalink)
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I have a question, if 3.8 uses the drive by wire setup couldnt you just swap the throttle body off the 3.0 and put it on the 3.8? wouldnt that get rid of that particular issue, and then just use the ecu off the gts for the mivec control?
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Old 08/08/2007, 12:50 PM   #57 (permalink)
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I'm guessing you'd have to keep the 3.8 ECU for it's own motor...
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Old 08/09/2007, 08:14 PM   #58 (permalink)
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I kind of figured that, but would there be anyway to get around the drive by wire set-up, thats the only reason i posted that question. that shit is a pain in the ass to work with.
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Old 10/29/2007, 05:12 AM   #59 (permalink)
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Sorry for asking a reoccuring question, but I really need a quick answer. Will the 3.8L fit in the engine bay or not. Heres why I ask. I came a across a 6G75 from a 2006 GT Spyder that was given to a fire dept. by me. Well they cut the car up, and the engine, transmission, and rest of the chopped up mess resides in a junkyard. The owner is selling it for really cheap I guess, and I want to know what all I would have to do to get it in, and running.
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Old 10/29/2007, 01:13 PM   #60 (permalink)
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If you would've read from above the engine mounts "appear" to be in the same location, it's just not certain that the transmission will bolt-up directly. You'd also need the ECU and anything else that is electronically controlled. I'd say stick with the 3.5l swap.
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