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LuckyX2 · 07-14-2011, 11:40 PM

First off I'd like to say hi as this is my first post here (started on nico a while back

)

I have a s15 turbo redtop sr20det setup with poncams that just put out 293whp and 299tq; tuned by myself on my Haltech Platinum 1000. But after witnessing my little s15 turbo's inability to hold boost in the upper rpm's (spiked to 18psi, tailed to 12psi...) I've decided to move to the 2871/s3 combo.

Unfortunately, due to some some poor machine work on my head, my sr is in pieces now. The valve stems were machined down too far and the shims were pressing on the retainer before the valve stem because of that, thus loosening the keepers and eventually leading to one failing. I'm in the process of fixing it but the plan is to bring it back better than ever with a 2871 and some s3 cams.

I was wondering, Cody, that since I'm about 5 minutes from the Diehl's Paving you dyno at; would you be interested in meeting up when I go to re-tune? It's probably not going to be for a bit since I have to order valves, wait, replace them, measure clearances, order the shims, wait and then put them in but I thought I'd give a heads up.

My setup will be as follows:
Gt2871rs
S3 cams with adj. gears
Solid lifters and dual springs
Mild port/polish
LS2 Coils
Tubular exhaust manifold
Greddy FMIC
550cc (650cc @ 4bar) injectors with adjustable fpr
Walbro 255lph
3" exhaust
Haltech Platinum 1000 ecu

There's a few things I'm interested in seeing:
1.) 2871rs vs 2871r
2.) How much difference will cam timing produce in the powerband?
3.) What advantages will my extra head work bring? Solid lifters should produce more usable cam lobe area and thus more area under my power curve and also, I hope my handy work with a dremel payed off...
4.) Stock ignition vs. LS2's; any real benefit at this power level?
5.) Tubular vs. honed stock
6.) Standalone vs. Jim Wolf/Enthalpy

I feel like my car has a pretty unique set of supporting mods and could make for some interesting comparisons to yours, Cody. It's just a shame that there are too many variables to pinpoint what would be making the differences.

07-14-2011, 11:40 PM	#4
LuckyX2 Zilvia Addict Join Date: Jul 2011 Location: Philadelphia Age: 34 Posts: 850 Trader Rating: (7)	First off I'd like to say hi as this is my first post here (started on nico a while back ) I have a s15 turbo redtop sr20det setup with poncams that just put out 293whp and 299tq; tuned by myself on my Haltech Platinum 1000. But after witnessing my little s15 turbo's inability to hold boost in the upper rpm's (spiked to 18psi, tailed to 12psi...) I've decided to move to the 2871/s3 combo. Unfortunately, due to some some poor machine work on my head, my sr is in pieces now. The valve stems were machined down too far and the shims were pressing on the retainer before the valve stem because of that, thus loosening the keepers and eventually leading to one failing. I'm in the process of fixing it but the plan is to bring it back better than ever with a 2871 and some s3 cams. I was wondering, Cody, that since I'm about 5 minutes from the Diehl's Paving you dyno at; would you be interested in meeting up when I go to re-tune? It's probably not going to be for a bit since I have to order valves, wait, replace them, measure clearances, order the shims, wait and then put them in but I thought I'd give a heads up. My setup will be as follows: Gt2871rs S3 cams with adj. gears Solid lifters and dual springs Mild port/polish LS2 Coils Tubular exhaust manifold Greddy FMIC 550cc (650cc @ 4bar) injectors with adjustable fpr Walbro 255lph 3" exhaust Haltech Platinum 1000 ecu There's a few things I'm interested in seeing: 1.) 2871rs vs 2871r 2.) How much difference will cam timing produce in the powerband? 3.) What advantages will my extra head work bring? Solid lifters should produce more usable cam lobe area and thus more area under my power curve and also, I hope my handy work with a dremel payed off... 4.) Stock ignition vs. LS2's; any real benefit at this power level? 5.) Tubular vs. honed stock 6.) Standalone vs. Jim Wolf/Enthalpy I feel like my car has a pretty unique set of supporting mods and could make for some interesting comparisons to yours, Cody. It's just a shame that there are too many variables to pinpoint what would be making the differences.