The S1's were designed around the stock turbo. You could still run them with a larger turbo but you wont see as much of as a gain as you would with S2's

 

Im going to be running S1's in my g-friends 35r pump gas dd 9, the 93 oct gas and stock engine will be at its limit before the cams so it should work for me.

 

So, John, if you even see this post, someone with S1s on a stock turbo at the strip should be shifting at 7k then running out 4th through the trap?

I have been toying with different shift points and my fastest run to date was a redline 1-2 shift (7800), 7500 2-3 shift, and 7200 3-4 shift....

We all know that on a good launch the 9 turbo spools so damn fast that its all but impossible to not hit the limiter in the 1-2 shift but the rest is what im curious about.

Bren

 

Many People would suggest that you run the S2 on a bigger turbo even for street. There are people running the S2s on the stock 9 turbo and have no regrets. Plus the gains would definitely be more noticeable with the S2 on a larger frame turbo. That's my guess.

And you can run the S2's on the stock valve train but would have to keep it under 7k. S2 reving to 6500 should have no harm.