Gsc s2's vs s3's w/fp red
 

Been a while since I posted on here and about a year or so since I built my last Evo. The times come again and I'll give a basic build run down of what I'm doing.
2.0l
10.5:1
E85
Fp red with full supporting mods.

I ran s2s with my last car on a stock Evo 9 turbo with great results. I was going to just purchase them again but after looking into s3s it seems people even run them on stock turbos. Now I'm stuck in the debate between which to get, opinions?

Since you are using E85 on a built motor meaning that you can get the max out of an fp red, and depending on what you want to use your setup for I have a couple of basic guidelines for you:


-If you are after very good low end but still keeping power strong in the upper revving part, that's between 7-8+ K, stick with cams that have less than 11mm lift and 225-230 effective duration.


-If you are building a dragster orientated setup, use a set that has 11+mm lift and 240+ degrees of effective duration.







Marios

This is a real-world test with a level playing field maintained throughout to guarantee accuracy and repeatability of results. The test car was equipped with a GT35R. In general, the difference in spool is reduced as the turbo becomes larger; the difference in power is reduced as the turbo becomes smaller.

https://www.evolutionm.net/forums/ev...ml#post5631514

Old and pretty good test, went through it when it firstly came up. It goes without saying that the bigger the turbo the greater the loss of spool, 2 different variations of cams on the same turbo-setup have different result of a powerband as the set clearly states. The same goes for using the same set on same setup but with different dialing.


As a basic rule of real world testing that follows theory and I am sure many tuning houses on here would agree with me, a milder set aids spool of a turbo more than a more aggressive one on the same exact settings.


In another thread I suggested to a fellow member on here to exchange his kelford 272 10mm lift camshasfts with a set of hks 280s. The above test simply verifies what I said and I thank Ted B for digging it out. Explaining a little more to those who have not already got it,the kelfords 272 used in the test are not the same as the ones the fellow member is using, the specific set has 11mm lift and some more duration in relation to his set. By changing to hks 280s he will lose nothing low down, in fact he will gain through out the rev range instead, mainly due to the better lift/duration combo of the specific set in comparison to the cams he already uses. He is on stock head and block on fp red turbo.



If the hks 280s were tested by AMS, they would be having the same spool such as the hks 272 and in between the hks 272 and Kelford 272 in max power.



So in other words the hks 280s would be ideal for a smaller turbo pushing less CFM than a gt35r such as the fp red in creating the ideal powerband. A set you can find used, cheap on net and can work fine without any sort of issues with the stock valvetrain.







Marios

+1 for S3's

I personally feel that an S3 cam would be a big mistake on a 2.0 RED Car. The S2’s would make more power and faster spool all the way across the RPM range except at the absolute end of the curve. The S3 is simply too big and you will lose power over the S2’s, lose even more torque. Running a Turbo like a 37R or Larger? Have at it. BB RED? S2’s all day long no question.

S2's hands down for a 2.0L FP Red setup

I made 569 on a jb 64mm red and s2's w/ e85.

Aiming to have the car as quick spool as possible and high torque to keep it as fun on the streets as possible. Most likely just going to stay with the s2s at this point from the responses. They worked well in my last car.

def stick with s2's for fastest spool..

https://www.evolutionm.net/forums/ev...tock-cams.html

On smaller turbos the loss between S2's and S3's is very minimal but the gains up top are large. I would go S3's and call it a day. What is 200-300 rpm lag for an extra 20-30hp up top? Worth the trade off in my opinion, plus you have 10.5 compression to help with off boost response.

So torn, I'd give up a few 100 rpms for gains up top.

Not 100% what you are looking for since it was a Black and not a Red, but the S3s definitely held power very well out the top. An S2 car with Black will normally make 430 or so at 28-29psi where this Black with S3s was at 25.5-26. For the compression and turbo you have I wouldnt hesitate putting S3s in it.

I don't get that John? I run 1st Gen S1's in my BB Red Evo IX and made 460WHP and 400FP's of torque at 29PSI dropping to 27PSI. I know an S2 and much more aggressive tuning with a VSR will get me near or past 500WHP on pump. The S3 might give me ore PEAK but the area under the curve would most likely drop, more lag and then power would be less until the absolute peak of the power band.

Everyone wants to have giant cams, the biggest cams in the land for whatever reason but I'm telling you an S2 would make more power within your powerband until the peak. Want to Run an S3? Run a turbo like a 37R or bigger. Even with a 35R i'd pick the S2's.

He said that the car made same power, with less boost. SO, turn the boost back up and reap the gains.


I missed the 10.5:1 compression. I say do the S3's..