You'll get better feedback from the latter. It is highly unlikely ATP can provide that exacting information you're looking for.

 

GTX3076R Compressor Map


GT3076R vs GTX3076R Compressor Map comparison

 

If I can make same power as now with less boost, even better. I would even be fine with 420-430whp. I just want it DEAD reliable 24/7 all day every day any weather condition and not have to worry about it or nurse it (heat/longevity/durability wise) without fear of it failing me.

 

That's going to be fine for any ball-bearing cartridge as long as you're using the correct oil, good oil cooler, and correct use of water fittings. Its about as "dead reliable" as anyone is going to get . Luckily, whether its ATP or any other Garrett-distributed company, you're going to get the same cartridge number and set for either their housings, or the Garrett ones. I think sticking with the GTX3071R or even the current GT3076R would yield that more effectively than the GTX3076R, despite the compressor map comparison. It doesn't take into account turbine wheel efficiency of the 60mm exhaust wheel.. which could be a problem for circuit use in the long run.

The only thing that has always bothered me was the small bit of mis-match that seems to exist between the compressor wheel of the GTX3076R vs. the GT3076R. Now the change up was really good with the GT3071R and GTX3071R, but they seemed to have missed the ball on this one.. Its too much compressor wheel flow over 2.0PRs than the Turbine wheel would like for the transient response that you're looking for.

That's why they created the GTX3576R, to better match that compressor wheel with the N111 68mm GT35R exhaust wheel: to better match the turbine flow with the compressor flow and rotational inertia of the GTX3076R wheel. That is why a few companies were smart and made some "in-between" sizes to match with the N32 60mm exhaust wheel more effectively, that stay within the 57lbs/min-59lbs/min level, and not the higher 60-62lbs/min flow rate that the GTX3076R uses.

Now, how that exactly translates into use of the ATP housings that are available for bolt on use, I cannot say, as its easier for me to use universal housings than the bolt on versions. that way , I don't lock myself into one particular company for all my needs.

 

not sure if i mentioned this, but im on a 2.3L so lag probably won't be an issue. On my local dyno, there was a guy who made 480whp with same turbo. Note sure the boost level, but im guessing around 28psi-30psi.

 

That's good. Being a large bore/stroke will help with much more midrange torque for the circuit than upper end power anyway. I'm not saying that 480awhp can't be done on the GTX3076R, but I'm not looking at upper end power. I'm looking at better torque curve for the majority part of the rev range that you'll be in. being a 2.3 litre will really help with that, but honestly if going much higher than that for bigger power, the GTX3576R is a better answer for the 2.3-2.5litre user for the best of both peak power and torque band.

 

The GT30 and GTX30 use the same size turbine wheel but is the blade shape the same?

 

Out of curiosity, why are you not also considering a FP red/black?

 

It is because I think they have the same inherent issue possibly with the BBK-B in terms of back pressure and small oem hotside. Yes i know they both are ball bearing. Plus the fact that if I were to get it, i would need a different intake, a different downpipe, etc. which adds costs. My car is down right now and want it back up and running as soon as possible as to not miss any more events that I already missed because of the turbo.

 

The ATP turbine passages look pretty large based on the exterior dimensions. The sharp turn needed to point the exhaust gases in the direction needed for a normal rotation turbo doesn't really seem any sharper than the turn that the exhaust gasses make in an OEM exhaust manifold at the collector region.

Since its nearly a bolt-on turbo, why not go for it? Seems like you'll not be going back to the 3B.

 

I think it's either you don't get the fp red or black because of the new down pipe etc needed or the oem housing isn't it? But not both?

Anything that gets lower egt is going to be your hero IMHO

 

Option A) Lower boost/lower timing than before. :P
Option B) Full on Race Kit (Garret/Borg Warner EFR $4-5.5k)
Option C) ATP GTX3076R (sponsorship deal)
Option D) FPRED or FPBLACK (better than BBK-B in backpressure/EGT standpoing?) +Downpipe + Intake
Option E) Fix the BBK-B and run it (not sure how much $$$ if any, depends on Chad)
Option F) Drive slower. :P

 

I agree with 3576. the 3076 is a mismatch. 3576 works way better. spools faster and makes more power.

 

Zhong
I have to support ATP GTX3576 being best matches
Even faster spooling and more top end
And FFTec built one and made 530whp at 30psi without optimizing much, on 2.0!!
2.3 will be better all around matches to it!

 

According to this thread the 3576 is a horrible mismatch for 2L'S which is why no one has seen any great dynographs or results to prove it.
http://www.evoxforums.com/forums/sho....php?p=4077858