hey everyone, im in the market for a turbo and wanted to know what you guys/gals thought. my power goals are 300-400hp. what would a good turbo be that would not restrict the motor at around 8psi. and i want it fully spooling around 4k rpm.

tell me what you think of a turbo like this specs
* Compressor Wheel 0.60 A/R Cold Side
* Trim: 50
* ind/exd: 76.2mm/53.9mm
* Turbiner Wheel T3 5 Bolt Standard Hot Side
* Trim: 31
* ind/exd: 57mm/65mm

would this turbo cause any restrictions?

 

Gt3076r .82 a/r sounds about right to me. Mine spooled at about 4500 on the 2.0L engine.

 

You just cannot measure the turbo and psi into the power target. You have to consider the design and size of tubing on the manifold, downpipe, exhaust etc.

If you are using simple cast log manifold, you may not feel significant boost at 8psi. However, you will find the comfort boost at 7psi with tubular design.

Each component must work in harmony to achieve your desire power, not based on turbo only...

 

i understand there will be other factors involved in that, but as far as the turbo goes, will it turbine side be too small?

as for a gt3076r, i cannot afford such a baller turbo, its really expensive.

 

3076 all the way, your manifold will affect your spool just as much as the turbo!

 

Save up longer. Do it right the first time.

Back in the day when I turboed my first car, my parts sat in the closet for over a year before I had enough money to get everything else i needed to finish.

 

thankyou for all the advice, this will actually be my 3rd car that i will turbo, i feel you when you say parts sit. but all previous turbo'd cars has been kit. the only thing im afraid of when i put this thing together is the turbo size, an equal length manifold is being made, with a v mount project in the works. i am def not a noob at turbos, only when it comes to s2ks and turbos.

 

the gt3076 on a equal length manifold should get you 500hp on 18lbs! with 93 octane.
spool stupid fast and be a blast to drive - i have done several just like this.

 

a precision 5965 is definitely cheaper than 3076R (especially if you buy one that isnt ball bearing) and may even spool up a bit quicker.

are you looking for 300-400whp @ 8psi? with an equal length manifold i dont see a problem with that. a guy on this board made 340whp with an inline log @ 8psi tuned on EMS.

in my experience the A/R rating on the hot side tends to matter much more than on the comp side. if you are not planning on running higher than 10psi or so i'd say stick with an .63 a/r on the hot side. if you want to upgrade go to an .83 or higher, depending on how nuts you want to get.

 

I use a Gt3076R with the .82 hotside and i get full boost around 4000-4300rpm ( 8psi 371whp - 249 ft/lb ). Its really not that baller....I paid 1200 for mine. If you cant afford a 30R then use a 50 trim t4 compressor wheel mated to a T3 stage 3 turbine in a .63 hotside. Will spool as fast as a GT3076R and flow about as much too. Its the old tried and true t3/t04e 50 trim.