I was just curious if its possible to hit the 400hp mark on 91 octane? If not what are the usual numbers for 91 octane? Theres no e85 for about 250-300 miles for me.

 

Have you ever considered water/methanol injection? Not sure how much of a pain it is to setup on turbo cars but I use it with TVS and it is a great option when all you have is 91.

 

Only way ur hitting 400whp on 91 is with a zfr or bigger, maybe k04r , and like 750 cc or more meth at like 28 psi. I have to use 91, I run 1075cc meth and 30 psi on s257 and I'm decently beyond 400 . just on 91 it will knock once the tune gets aggressive. Meth is easy to do, hard to get for people in the states, very easy to get in Canada. Any paint department at hardware store has pure meth. Install is not for someone who can't change their oil, if u can at least do that, u can install the kit

 

Wont hit 400 on the r on 91 even with meth.

If you are on the stock turbo and only run 91 you will be hard pressed to get to 320whp

 

Why do you want 400hp? Just cause it's the number you chose?

What sort of modifications do you have now? How much hp?

 

That's usually why people want a certain power, that's their goal they choose ,so they work toward it. Its not like they say, I want to road race this so I'll need 400hp.

 

ive done over 400 whp on 91 octane only. just bigger turbo's.