hey guys, last year I bought and installed a FB stage 2 kit with the gtx3582r turbo made 430/278. I like it that it gives me top end power but wanting a little more mid range power. Build boost at about 4800 and full boost at 5600 but I want to spool quicker then that under 4800, I've seen and heard talks of other turbo like the gtx3076r and BW267sx series. What are the recommendation on a fast spool turbo?

 

A GTX3576R will spool about 400-500rpm sooner.. A GTX3071R will be about 700-800rpm sooner. Considering your torque and power numbers, you're hardly pushing the GTX3582R at all, it's a 700whp turbo. I'd probably just drop down to the GTX3071R and it'll probably make about the same power on pump as it's a 500whp turbo. Actually, the new Gen2 GTX3071R is probably 550whp, maybe even 600whp pushed to the absolute limit.

Another thing really hurting your spool is the turbo sucking hot air coming off the radiator. I would do something like this which is duct cold air to the compressor inlet. It's probably worth a few hundred rpm of spool:


480WHP Honeywell Garrett Powered F20C: Devin Giles' Time Attack S2000

Or make and air deflector like this:

 

I would go with the new Garrett g series g25-660. It’s rated at 660 hp and should spool well over 1000rpm faster. Or the gen 2gtx3071r is rated at 650hp and will also spooL faster. But the g25 is smaller than a gen 2 gtx3071r and rated for more power.

https://www.atpturbo.com/gseries/garrettgseries.html

 

You also have to look into the hot side. The size of the turbine, and the AR of the hot side will GREATLY adjust spool and power curve. Smaller turbine, smaller AR fast spool more torque, Lower peak HP.

 

Thanks, I will look into getting something like this for it but I'm also thinking of grabbing the GTX3071R, but still looking for option as I'm not looking for big power. If I can get it under 500whp and over 320-330lb tq I'm fine with it.

 

what is the prefer trim if this is the turbo I went for?

 

Also, could I possibly change the AR hotside to be smaller to achieve a quicker spool instead of buying a new turbo?

 

Unless you have swapped out the OEM exhaust valves for something suited to the extreme temps of turbocharging, be very careful of changing to a smaller exhaust turbine as the increased back pressure will cause the standard valves to fail (lunching the entire engine).....

 

Not quite sure where you going with this here but is it better off getting a different turbo instead?

 

Good question on what your current A/R turbine housing size is. My go-to is 0.82 A/R. The 1.06 is too big and costing you ~200-300rpm of spool. But I would still drop down to the GTX3071R in the 0.82 A/R turbine housing.

G-series is a badass turbo, but would also require a change to the turbo kit setup as the G-series uses a v-band inlet on the turbine housing. The GTX3071R would be nearly a drop-in replacement with the only difference being a slight difference in compressor housing outlet location. But that can easily be taken up by the flex in the IC piping. The G-series is really a motorsport turbo too, so the extra cost may not be worth it for a primarily street driven car. Well, unless one must have the absolute best