My Tubonetics “ball bearing” (To4B H trim and stage 3 .63 A/R hot side) has had its seals changed every year so far and I do take care on shut down. So I am looking for a new true Garret since they seems so reliable. Something like a GT35R.

However, my car is an accord 98 with the not so famous F23A1 engine. I am currently pushing around 290 whp at 16 psi and would like to reach at least 350whp at no more than 20 psi. It’s got 2.5 inch down pipe and 3” after that, no cat.

So my question is. Is it worth it to get a GT35R for my goal? Or should I just get a GT3071R , GT3076R instead or anything else? The car is mainly used for street and road race driving but I do not mind a little lag. Full boost starts at 3700 rpm. Ends at 6500 rpm.

What do the experts thinks?

 

They will all get you to your goal of 350WHP.

What kind of response and headroom are you looking to have?

Quick response and less headroom would be the GT3071R and slower response and more headroom would be the GT35R with the GT3076R in the somewhere between.

 

Headroom? I would be very happy to get 350 whp at no more than 16 psi. I just do not think it can be done on the F23. 350 whp is probably like 22+ psi.

 

Each turbo will flow enough to make the horsepower you want.

At what pressure is another matter entirely and strictly between you and your engine builder as to how well you can reduce the resistance to that flow.

The lower the resistance the less pressure you will need to force the required amount or air to make the power you are after.

 

Yeah that's what I'm thinking. Compresser side is easy to understand, but hot side is not that easy.

 

Any more opinions?

 

Sure, I have lots of opinions.

As far as our being in Iraq... I think********************************************* **********
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living in this country!

As far as your turbo. Anything you can do to increase your VE (decrease resistance to flow) the more power you will make at a given boost setting.

These three turbos can be purchased with the GT or T-31 turbine housings in either a .63, .82 or 1.06. The .63 will give you the best response, the 1.06 would be overkill and the .82 'probably' the best bet given your situation. The GT turbines have a 3" outlet versus the T-31's 2". While you can go from 2" to 3" on your DP, if you have the room to make the 3" bend all the better. It ALL adds up, a few % here and a few % there. Use a tubular header and external gate too!

 

there are some rumors floating around about 35Rs with T67 compressor wheels... the spool of a 35R and the power of a t67

 

Thanks, Alfa Turbo.

Full-Race Geoff, what do you mean?

 

i mean if you wanted a higher power gt35R that spooled identically, they are in existence, and would definatley make the power at the boost level you want to be at.

if you wanted quicker spolo the gt3037 makes huge tq, spools quicker and would probbaly be a great turbo for your application

 

Sent you a pm geoff, curious as to what this gt35r/67 is. Paul

 

Sounds like you need a mild cam to make that F series breathe. You'll make more power at the same boost level since you're probably choking things up now.

I think the 3071R can get you to 350rwhp, since SR20's can do 350rwhp on small 0.64 A/R GT2871R's at around 18 psi. The 0.64 A/R T2 housing is more restrictive than a 0.63 A/R T3 housing, so you're good there. The 0.86 A/R GT2871R's do more like 380-400rwhp at 18-20 psi. The key is that these engines don't make over about 320-330rwhp with stock cams since they start choking up top. Put in some cams and it'll pull to redline.

 

I would love to see a good maker of aftermarket cams for the F23. I think it would gain max. of 500 rpm. At 7000 rpm the piston speed is getting fast on my engine.

 

So, should I buy the GT35R .82 AR hot side and think it will not be a monster lag engine with an 1800 rpm powerband?

 

Just like every other turbo choice, that is the million dollar question. With SO many variables it is hard to say exactly what a given turbo will do on a particular setup. ( I know folks like FRG (Full Race Geoff) can tell you exactly what kind of power you will make with their setups, but in those cases they are managing all the variables... unlike this situation.)

In your case I would lean toward the 3076 since it has the ability to make what you want where you want it and in case it does not you can always opt for head work to get you there. If you go with the 35 you will make the power you want but may have more lag than you like or have to have to make that kind of power.