There is no difference in throttle response or spool time, only more power to be gained. The main difference is one needs valvesprings, the other doesnt.

Hey RSMike why dont you try and accuse Aaron (JohnBradley ^) of speculating too?

He might if you give the guy a chance.

Why would i? He has first hand experience and he isn't a chump like 90% of the people that post here.
There is a difference between people "feeling" that something will work and someone like Aaron who actually deals with this gear day in and day out.

Are you guys a bunch of Females or something? Because i know how women dont let Logic get in the way of a good arguement

Okay...so we have established that some of us dont wanna get along. Lets leave that in the corner, and get back to the subject at hand- Response.

I am curious as to why someone said it would reduce response, as in their reasons.

On the GSC Power Division website it states that the S1 cams will promote faster spooling, when the S2 cams say it will not lose any spool with Large turbos.

Have you spoken to Greg about the differences Aaron?
I know you've already said S2's are better, but you need valves springs.

I have not noticed a difference as far as increased spool in any of the many GSC cams we tune. S1 over stock makes more torque literally EVERYWHERE and power as well. It looks like the powergraph gets lifted straight up. The S2s dont lose over the S1s but normally really pick up out the top only. Out the top is subjective but we'll say something like 6k. This is why we normally suggest S1 for cars that are road raced and S2s for drag cars. Drag racing is almost always over 6k, road racing varies ALOT.

Transient response (time to boost threshold between shifts) might be better with the S1s but I have no quantifiable data nor care to guess as things like boost level, turbo type, fuel, weather, all play a role in this to some extent.

Greg and I havent talked about this specifically in the last 4 years we have been dealing. Sounds like a conversation I might have though

Gah JB, you help make up my mind in one post and then change it two posts down!

Everyone has been very helpful in their pms and posts, I appreciate it.

I think just for arguments sake i'll just get the S2s, I'm only a few mods away from xmaciek82x setup, so eventually we'll just be able to do a death race in the ol' reservoir and settle this ***ing matter once and for all like the old days.

Aaron, I think for the sake of symbolism you should be the flagger, what you think?

This is me summing it up. Any posts after this one were explaining possible differences should someone really want to nitpick.

"Flagger"? Sorry not following, but sure I like flags

aaron

Ya know, the person who stands between the cars and drops their arms signaling the start of a race. see aerosmith videos and rebel without a cause.

gotcha...thats what I thought but I can be dense sometimes.

so in your oppinion for an autox or road race car the S1s would be better even though the S2s are almost exactly the same but require valve springs and stuff? Just wondering because i have been on the fence for a year about which cams to get and still havnt decided.

aaron,

why do you need valve springs if you dont rev past 7600? will valve float be experience sooner on the s2 cam? a more aggressive cam with higher lift will gain at higher rpm correct? so then why would you need valvesprings for the s2 if say you only need to pull from 3500-7600?

Lift and ramp rate can kill springs as fast as rpm. Most of the cars I tune end up with rev limits of 8000-8100 because of drag racing so its a relative non option. I havent ever tried running S2s on stock valvesprings, Greg says it is okay with stock rev limit. Perhaps it is too much of my early V8 upbringing coming out to play.

I bought the s1's years ago and have always loved them but wished for more at the same time. I have to say that the car pulled harder through every gear. If I was to do it again though I would not ***** foot around and simply get the s2 instead.