I currently have a GT40 on my car. .58 Cold, .94 Hot. I am around 11psi by 3600rpm, on the stock port 76k Mile engine, Wich is awesome.

Recently Ive been looking into going down to a GT35R. My Power goals are 350-370whp.

My biggest question is, what will be the best Cold/Hot A/R for my application? This is mainly a street car, with the occasional Track day on a road course.

Engine setup as Follows:

S4 13BT, fresh, with a Heavy streetport
550s/1600s
Walbro 255
Haltech E6k
NPR FMIC

Any insight is appreciated!

 

Stock port, I would run no larger than 1.0 divided, If really good response is what your after and aren't too worried about long straights or topend I would get the .82 divided.

-S-

 

what rwhp are you putting down with the GT40 i would expect it would be pretty close to your power goals..

 

I would think so too...

Another turbo you can get would be the GT4082. It's a very responsive turbo on a rotary and it's much cheaper than the GT35RT4. It'll fit perfectly with your power goals too.

 

You mentioned a .58 cold A/R, so you must have a GT4082. I am planning on buying a GT4088 soon...its too bad your not getting rid of one of these.

Justin

 

Well The motor is getting ready to get a decent streetport and rebuild, tho im not sure how much that matters...? By the sounds of it I believe ill go with the 1.0

I havent had it on the Dyno yet, but I was guessing 300-320whp with the rich tune that is currently on it. Should I expect more out of the current setup?

 

The 1.0 will give decent response and good top end. I think it will suit you well. The larger sizes I offer would be OK, but from my experience the 1.0 is as big as it sounds like you want to go.

-S-

 

I appreciate the advice. If you get a chance can you pm me a price for the Turbo/Manifold combo? It has an SS Autochrome Manifold on it, and I would love to switch that out as well.

 

We have a manifold instock, check out our web site for pic www.rx7store.net

 

to zero R
what will be the best gt35rt4 to produce 450 hp on a street ported engine??1.08 hot side with the rs option? or what will be??

 

The 1.0 will give good response and With the RS you will have a much better time up top. Big difference in eff. at 20lbs. 67% versus 75% The 1.06 will be slightly off in response. If I get a chance I will swap housings out on the dyno and I can then show you the exact difference. It's up to you really tell me what you want.

-S-