Quote:
Originally Posted by ForeignMuscle
I have a $12k sr20 that I'm about to sell in lieu of a stock sr20 with a head gasket, head studs, CodyAce mani, JWT s4 or c1 cams, and the GTX2867.
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C1 cams are great, I just think they'd be better suited to a 30r turbo with less exhaust back pressure. Ttruthfull, that's the main detriment IMO with all of these T2 setups as it's such a fine line pushing these things with such high backpressure ratios. In this same regard that's why we see these setups often knock pistons out and or ruin headgaskets at the hands of inexperienced or aggressive tuners, as it's easy to keep dumping timing in them as they naturally are just going to keep spooling quicker. Torque onset is like herion to engines though, as they love it...but it doesnt' love them back.
Quote:
Originally Posted by ForeignMuscle
I would like to try for 475whp with very close to even torque at 25+ psi on e85.
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I'd say 450-475 would be possible, but you'd certainly need S4 cams and some RPM to play with. Big intake manifold too. In that same regard, I'd be certainly using an externally gated/extruded (or ported) setup for sure.
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Originally Posted by 801nismo104
Ill be running 20+psi on ny gtx2867r with sunoco 104 not E85 though. What size exhaust housing are you going to use? I have the 0.64 but I might switch over to the 0.86 to get the max potential out of it.
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Agreed there. Again we're at that fine line of backpressure actually hurting top end (albiet while helping spool up)....which stinks...but we can't have both unfortunately.
Quote:
Originally Posted by Rafa-Z
Hey guys so I was going to run the cody ace manifold but got a great deal on a DOC race manifold with optional v band setup but Im still interested to know what mods do you guys do to the stock manifold? Do you port it or run it like that? How much is it usually to extrude and hone? Do you guys think the DOC racing one flows a lot more?
Also I got a great deal on a GT2871r .86 since I didnt have enough money to purchase the GTX2867r but to my surprise, the same day I got it Pure Turbos posted that they upgrade it to the billet gtx wheel for an extra 300 which saves me almost half of what I would pay for the other turbo. I plan on posting dynographs and everything once its all done. Let me know what you guys think.
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The doc is tubular, so I don't see the extrude being worth it as that pipework is already quite smooth. I'd certainly get it coated, and I'd even go as far as to brace the manifold too to help further prevent cracking.
In regard to the Pure turbo setup I'd be interested to see, but I'm not sure if proof is in the pudding yet...it just seems too cheap yet.
Quote:
Originally Posted by ForeignMuscle
An sr engine has more displacement. I could use 12.5mm cams and I feel like I could push more than 24psi out of the gtx, but I could be wrong. Surely the thing is good for 450whp at least. If Codyace made 400whp with a 2871 and pump gas then I should be able to see close to 475whp with e85, 5 more psi, and the advanced timing that ethanol allows. No proof without puddin though.
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I strongly believe with my S3's that the GTX is an easy 415-425 whp car at 20psi just based on maxing out things that were not maxed before. It's a hell of a turbo.
Quote:
Originally Posted by Croustibat
TBH that CA, while very efficient, is boring with that turbo. When it had a gt3071r it has some kick to it. Now it has a big fat powerband... but it is boring. It accelerates very fast fast, but there is no "turbo feel", no kick in the butt.
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It's funny you say that as I've had plenty of people say 'man this car doesn't really feel that fast' and I like to point them over to the speedometer racing the tachometer
