i have heard of ppl running s3/s4 cam combo in turbo setups. i wonder how the s4/s5 will run? 12.8mm lift sounds tempting!

how much better are aftermarket cams than the regular ones in a det doesnt the turbo do all the work how much could cams actually do

^^^^^^^^^ you should search solo

as far as the cam q i have no idea pm choderboy mike kojoma

how much better are aftermarket cams than the regular ones in a det doesnt the turbo do all the work how much could cams actually do
A lot better. Indeed, search this forum for dyno numbers of cam-med turbos. +30whp is common.

Chris

i have heard of ppl running s3/s4 cam combo in turbo setups. i wonder how the s4/s5 will run? 12.8mm lift sounds tempting!
No-one has done it so no-one knows for sure.
SR20DE(T) seem not to like different intake and exhaust cams.
So, what type of combo do you have in mind? S4 intake, S5 exhaust?

Chris

^^^^^^^^^ you should search solo

as far as the cam q i have no idea pm choderboy mike kojoma

definitely :redface:

I've heard of people running staggered cams with nitrous, but not with turbo.

how much better are aftermarket cams than the regular ones in a det doesnt the turbo do all the work how much could cams actually do
i suggest researching the concept and functionality of a camshaft, i don't want to sound like an ass, but anytime you mechanically allow more air/duration to a 4-stroke motor whether turbo,supercharged,nitrous, whatever it'll net you more horsepower/torque ESPECIALLY on turbo motors. :biggthump

no.

if you increase lift, you will increase power on a turbo car. on a turbo car, unless it has a monster turbo, increased overlap (generally a product of increased duration) will more than likely reduce power. if you got these cams, youre going to want to reduce overlap to a minimum unless youre running a monster turbo (my turbo would be the minimum).

but, since youre asking, you probably dont really know how, or have the resources to do this kind of testing, so my suggestion is to stick with what is known to work: S3s or S4s with 2.5* retard on intake and 2.5* advance on exhaust. this would close up your overlap nicely, spool your turbo faster and fatten up the midrange. another good combo is some C1s with similiar cam timing, but they require valve springs, and every motor is different, so i would use that cam timing as a starting point.

with the S4/S5 combo, you could sit on the dyno for hours (at, what, $200 an hour? ouch!) and do nothing but lose power and have a nice, lazy turbo.