Quote:
Originally Posted by codyace
You don't need the longer dowell pin at all for it to work as it should.
BE careful with the M cams, as they IIRC are for the GTiR solid valvetrain.
That's my look at things too.
The main thing i look at with t25/t28 guys, is that they typically aren't making enough power to really show the difference between the two. That, combined with lightning fast small turbo spool, also sorta/kinda leave it up to debate for me.
FWIW: There are a few Japanese tuners that swear by running smaller based turbos with BIG duration (we're talking 266-272) cams and seeing some interesting power (first example is the Mines car, as well as some of the Evo Time Attack cars we see in the JDMyo! kinda videos). Obviously it's hard to compare a little inline 4 to a a little inline 6, but it would be neat to see a side by side comparison from persay, the S3 camshaft to the s4, or to somethign like a 272 duration cam.
Experience says that the larger duration cams will increase spool, but it would be neat to see by how much with the 2871 turbocharger.
It doesn't 'suck', it's just that (IMO) there are better routes to take. For those that argue 'you'll want the extra 20 whp'....no freaking way. 20 hp isn't even getting your toes wet in the pool. I say, if you want 400 whp, get the .64 housing...anything more, look ta a 3071/3076 variant.
The tubular manifold typically spools smalelr turbos later, due to design, and lack of heat retention.
This is the ebst way to look at things. I laugh at people that build 'drag' or 'drift' or 'grip' cars, and then take it their respective events twice a year, and are forced to drive a finnicky quasi-race car around the rest of the time. This is exactly why I went with the combo I did. It's perfect for a street car, and just so happens to work awesome on the road course. Don't get me wrong, I know where i could take away/add form the setup, but it's not worth the small changes to sacrifice it's street manners.
So arond 16 psi...you should be seeing more in the 350/360 range if you were on a dynojet dyno.
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??? But you wanted to get C1's, that really contradicts your statement. Eitherway, I will post my experience with the S4's once its installed. Unfortunately I dont have back to back dyno results, but I did have a GT2871r .86 with S3 cams before and the spool was pretty bad. So far the GT2871r with .64 housing spools really nicely.
SCC did some comparisions of the JWT cams...
scc cam comparo link (please make this a sticky!) - Page 2 - SR20 Forum
NEW JWT S4 SCC REVIEW - SR20 Forum
S4 cams really does not lose much if any low end, just gains more midrange and high end than the S3's.