[pwpanas]

Originally Posted by sezar

what the difrens between the (98 motor octane and 98 reasearch octane)
the fuel i will use is regular but it is 98 octane and that fuel is availaple on my area

2- iam talking about 600 hp wheels

3-i want it for roadracing

what is the the turbo that i shold use and what it's cost

1 - please find out the motor octane of the fuel that you're planning on using. Octane rating - Wikipedia, the free encyclopedia
In the US, typically we see 87, 89, and 93 octane available at the pumps, using the (R+M)/2 formula to calculate the octane. Are you saying you can get 98 octane 'race fuel' at the pump where you live?
2 - 600hp wheels is typically referred to as 600rwhp.
3 - do you already roadrace? which tracks?
4 - do you have an auto or a 6spd?

If you're planning on making 600rwhp with (for example, 93 octane (R+M)/2) pump gas, then you'll need to supplement with alcohol injection. There's really no way to do this with a 3L engine and 93 octane fuel. Honestly, it's doubtful that you could do this reliably with 98 octane race fuel as well, especially if you're using a turbo small enough to roadrace. For roadracing, you need a relatively small turbo so that you don't have to deal with terrible lag coming out of the corners...

Assuming you'll be supplementing with a methanol kit, you'll need to budget about $5k for your turbo kit, and then about another $2K or so for a proper, professional install of the turbo and the meth injection kit. Based on what you've told me so far, a 67mm turbo should do the trick.