6g75 NA hp?

[skyy406]

damn 60whp from those heads?

Greg, do you refinish heads? My Mivec heads need some work...

Does the 3.8L non-mivec lower intake mani work with Mivec heads?

[Silvertune]

Originally Posted by skyy406

damn 60whp from those heads?

Greg, do you refinish heads? My Mivec heads need some work...

Does the 3.8L non-mivec lower intake mani work with Mivec heads?

The MIVEC heads flow 274 cfm intake, non MIVEC flow 275. The difference is in the cams.

[Z1]

I had the 3.8 UIM & TB (bored to 68mm) fitted on the same day.....heaps more responsive than the 3.5 UIM & 65mm TB.

We back to back dyno tested the 3.8 UIM verses 3.5 UIM using the 65mm TB on my car and gained 4nm and 6kw with the 3.8 UIM.

[skyy406]

Hmmm. It would probably make more sense then to just begin with a 6g75 Mivec engine to start with.

[Silvertune]

Originally Posted by skyy406

Hmmm. It would probably make more sense then to just begin with a 6g75 Mivec engine to start with.

Can MS control MIVEC correctly though? The solenoid runs on a duty cycle so it doesn't overheat.

An old member named David (RIP) ran it on a window switch and he didn't have any problems but Idk how far you can take it until it burns up. Greg probably knows.

[2g Strat]

Why not cam the non mivec? You can get cams more aggressive than the mivec cam profiles...

What you save in buying a non mivec can almost pay for cams. And a non mivec doesnt get much easier as a swap....

[White Knight]

what would be a good cam for a non mivec 75 if i wanted to run all motor? would 272 be to much? and would a step down from that even be worth it?

[PharmEcis]

If I was able to bring cams to the market, would people pay $800 for a set?

[thahnic1080]

Originally Posted by PharmEcis

If I was able to bring cams to the market, would people pay $800 for a set?

im sure everybody will say yes but half of them wont buy them

[Silvertune]

Originally Posted by White Knight

what would be a good cam for a non mivec 75 if i wanted to run all motor? would 272 be to much? and would a step down from that even be worth it?

272 is going to breath outside your rev range, if you could hit 7k you'd be good. The 264's (stage 2's) would be perfect for you. They maximize the torque band and peak power a little over 6k at stock dialing on the 74. If you dial them back a tad and put them on the 75 I bet you could peak around redline.

Originally Posted by PharmEcis

If I was able to bring cams to the market, would people pay $800 for a set?

That's an awesome price. People spend that much on 350z and 3000gt cams. RPW's are over a grand for just the cams.

[mysticj]

Originally Posted by White Knight

what would be a good cam for a non mivec 75 if i wanted to run all motor? would 272 be to much? and would a step down from that even be worth it?

272 would be ideal on a 3.8L. Larger engines love bigger cams[duration], my 4G64 DOHC runs 272* on the intake and idles like stock.

[foxbrand]

subscribed

[SPD_FRK]

The MIVEC has a slightly better camshaft, and design if you know what you are looking at with the MIVEC compared to the Non-MIVEC camshafts.


We have been working hard the last few months on camshaft profiles and their operating design. We should see boostzealot running our first set by spring time and we anticipate some damn solid numbers in comparison to other cams currently offered.

[Silvertune]

What's wrong with the RPWs?

[SPD_FRK]

Originally Posted by Silvertune

What's wrong with the RPWs?

Nothing wrong with RPW camshafts. They have some good profiles offered, but they haven't really gone for further innovation of the design such as OEM has been.

[boostzealot]

btw, someone asked about 272's in a 6g75, the answer as given already is that the 75 nearly needs something comparable to a 272. reason being is with given the perfect conditions the 75 has the capability and the efficiency to make use of cams in the 280 range. on top of that, with some real meticulous work on the heads and the rest of the breathing functions the 75 would be on par with a cosworth built vq35 that was stroked and cammed. this motor made over 400 and had...get this...300 duration cams in it. oh boy, imagine the lope at idle if you could get it to live below 1k rpms. also the lift on those cams were somewhere in the 12.5mm range.

Justin, there is nothing wrong with the rpw cams themselves. this is why i joked about buying them back from you. its just the support and lack of information rpw is and was willing to share on them and now with the availability or rather lack there of of these cams and very slow response times from rpw along with the price, they are not worth it any longer.

BHM has been busy folks, and you all will reap the benefits if and when you participate.

[Silvertune]

RPW straight up posted the exact specs of the cams... They've been posted here before as well. What more do you want from them?

How do you plan on getting the 75 to rev above 7.5k in order to support cams of that duration level? Stiff valve springs will only get you so far, you're going to have to address the lead heavy rockers and the whimpiness of the lifters if you're going to take it that high.

[boostzealot]

and dont i always come through with what i set out to do or research?

[SPD_FRK]

Originally Posted by Silvertune

How do you plan on getting the 75 to rev above 7.5k in order to support cams of that duration level? Stiff valve springs will only get you so far, you're going to have to address the lead heavy rockers and the whimpiness of the lifters if you're going to take it that high.

Do we have any dyno charts of people running the 6g7x series motors that high and making additional power? From what I have seen, most people are making power in the 5500-maybe 6500rpm ranges and power starts dropping off.

The 75 heads (MIVEC or Non-MIVEC) with definitely breath happily in the upper RPM range, that is not in question. Offering a camshaft with a longer duration than an OEM 6g75 cam, with additional lift will put it on par, if not above that of the 6g75 MIVEC motors...without having to bring the motor out to 7K RPM.

Unless you are building a strictly race motor that will rarely see operation RPMs below 3K, and it will build and maintain power to the higher RPM range...it is a mute point to argue about making anything hold up to 7500RPMs or more.

Bj and I have a lot of time and documentation poured into the camshaft stuff and we have already addressed the other valvetrain components to accomodate the camshaft profiles we would offer.

[Silvertune]

Originally Posted by boostzealot

and dont i always come through with what i set out to do or research?

For your car of course. Its easy to have a custom set of something made but making it a simple affair for someone else is another ball game.

Originally Posted by SPD_FRK

Do we have any dyno charts of people running the 6g7x series motors that high and making additional power? From what I have seen, most people are making power in the 5500-maybe 6500rpm ranges and power starts dropping off.

The 75 heads (MIVEC or Non-MIVEC) with definitely breath happily in the upper RPM range, that is not in question. Offering a camshaft with a longer duration than an OEM 6g75 cam, with additional lift will put it on par, if not above that of the 6g75 MIVEC motors...without having to bring the motor out to 7K RPM.

Unless you are building a strictly race motor that will rarely see operation RPMs below 3K, and it will build and maintain power to the higher RPM range...it is a mute point to argue about making anything hold up to 7500RPMs or more.

Bj and I have a lot of time and documentation poured into the camshaft stuff and we have already addressed the other valvetrain components to accomodate the camshaft profiles we would offer.

I'm not talking about the stuff you plan on offering, you and I have been over that, and I trust your research as well. But BJ commented on its ability to support the same kind of CFM a set of Cosworth VQ heads can, a set of 300's, and that will take far more then a set of valve springs. It takes more then potential, you have to be able to sweep that kind of volume if you want to make 400 horsepower with under 4 liters and you don't do that without spinning above 7.5k. Even small V8's hit 8 grand in search of that kind of power and they don't necessarily suffer down low so much.

You cam goals are realistic and achievable at any rate. We all know it by now, the problem with the old gen heads is the tiny valves, you can see it in my dyno chart and everyone else's. The 75's glory comes from the simple fact that it has the larger valves, way larger, over 5 millimeters. The ports are basically the same, the 75's being substantially bigger only down by the valves; no port and polish job could compensate on the old gen heads in comparison though it does make a massive difference.

A blueprinted 75 with a set of decent cams is a recipe for everyone 90% of the people who drive these cars could dream of.

[boostzealot]

i see what went wrong, Justin, you have to not take that comment as a point to prove the potential of an off the shelf type of application. cosworth spent over 4months just developing the cams for that particular application and the cams were not the crown jewel of that build although they did help make that power. the particular vq in question was a test bed for nearly five unique and one off cosworth products and really allowed them to go, for the lack of a better term, "F1" on that motor. it didnt have to rev to the sky to make power but it had the ability to. the major factors in making 400hp with under 4 liters is keeping the motor's efficiency up as high as you can for as long as you can. thus why i brought up the cams they made for that application. they wanted to have a beast of a motor. not just on power but on curve. with the cams being so large and having such a high lift, they were able to utilize a very high compression piston specially designed for the cams. the heads were ported not for flow but for efficiency and thus were matched to the cams and the VE capabilities of that setup. also, the headers were tuned for that car. in a way, if that motor had to be put into a 350z or g35, the headers would have to be designed differently so that they gave results close to those on a bench, they would never achieve more.

so my point still stands about the 75 being capable of doing the same thing with very close attention to detail and the level of build would have to be something that most 3ger's couldnt afford as it would cost most of our salaries to do so.

we all know development takes more than just one try to perfect. (which is why my second set of headers fit better than my first) so cams will be the same way. as matt said, we are coming up with a solution that people will be able to afford and will see viable results from. is it too soon to say that with supporting mods and tune that someone without a built 75 will be near 300whp? no

[foxbrand]

you sir have made me very happy to have joined this forum

[PharmEcis]

300s.... You mean what is in my shop's drag EVO...

[Silvertune]

Fair enough Bj, I see what you really meant.

If you guys ever need/want someone to do a comparison with RPW's, a free set of cams might earn you a guinea pig.

[mysticj]

The problem with the SOHC head is the limitation of cam lift. The journals are like 45mm and if the cam have too much lift, it can't fit inside the head.