Just as the title says... I'm looking to see where you are hitting your peak torque RPM-wise. I have a turbo eerily similar and am plotting some calculations on the compressor map based on the GT3076R. However, with the calculations I have now based on 20% total airflow, I am AWFUL close to the surge line. If I knew the peak torque reading I could be calculate these things. Thanks in advance for the information and advice guys and gals! Boost will be at 17-20 psi BTW...

Below is what I have thus far (based on 20% of max airflow @ 8000RPM redline, 1.9L engine) CLICK THUMBNAIL:

 

3076 on a 1.6L:

 

Thanks Braineack... I had actually come across that by searching but it looked like there were no BP-ZE's running this turbocharger at all. Should be interesting to see if one turns up out of the blue.

 

compressor wise, is it the same as the 2876?

 

I'm using that turbo and the car should be running by the end of the day. It's going on the dyno this Saturday, but I'll just be running a base tune and a 1 bar spring in the wastegate. In the next week or two I'm having it tuned and will up the boost until I run out of injector.

 

I think it is more similar to the GT30R housing, but don't quote me on that. I'm pretty sure it has a T04S compressor housing.

The specs on the turbo are:
Incon Systems GTBB37
Compressor --- Ind. X Exd. 55 mm X 76 mm 52 trim A/R .60
Turbine --- Exd. X Ind. 53.5 mm X 56.5 mm 90 trim A/R .86

Keep me updated on this as I see you are running the 1.9L as I plan to do. I still have awhile yet until I'm running so it would be good to have a comparison. Can't wait to the see the results, pics, and video (hint, hint).

 

And yes...

Click to enlarge:

 

I just hope that is a 7 psi run or something because that is a damn narrow power band for little over 200bhp.

 

No, yours is a td04 wheel or something like, the 3076 wheel is a different size/shape/style.

 

user was cptnsloni, pretty sure it was 12psi. it helps if your turbo spools before 4K.

 

garrett put a mitsu wheel on my shizz?

it's a TO4S style also. just smaller inducer.

 

What's the size of the 2876 y8s? I have seen dynos of my exact turbo on a few SR20's and it has made anywhere from 350-420WHP depending on supporting mods and boost.

 

Turbo 705330-2
CHRA 446179-18

Compressor
Ind 52.7mm
Exd 76.0mm
Trim 48
A/R 0.70

Turbine
Wh Dia 53.8mm
Trim 76
A/R .86 or .64 (i run the 64)
Type Internally Wastegated

though mine has a welded flapper and I run EWG.

 

just looking, it appears to be a better suited compressor based on your lines above. it puts you a little bit further away from teh surge line.

 

Yeah... I actually have that plotted I do believe. I'll have to post it when I get back to work on Monday however. The GT2876R WAS a better match for the engine, but wouldn't get me to the power capability that I wanted and also, I got a steal on the INCON GTBB37 turbocharger... I too have the internal flapper welded shut and plan to run EWG as well.

 

On a side note: My plots assume that you are making full boost at 20% of airflow, which as you all know is not the case at all. Peak torque should be a much better estimate as you know you are making full boost at that point and maybe tach off another 1000 RPM to from the peak torque RPM to assume that you are at full boost by then...

JayL! I needz dyno data!

 

I'm seeing full boost at 3750 but then I only run <10 psi.

on mine i'd call 15 psi at 4250 and 20 psi at 4750 give or take a hundred rpm.

max boost at 20% airflow sounds fun.

 

Haha! Yes, max boost at 20% of max airflow does sound fun... Thus why it's only an assumption unless I run a GT10 series.

 

Here it is. Unfortunately it's pretty much worthless and not a good representation of what this turbo is capable of. You could say that I have lots of work to do.

 

Haha! Appreciate the dyno Jay. I'm guessing this was at 10 psi as you mentioned earlier? Do you have any datalogs of boost levels and how they climb with this turbocharge on the 1.9L? Thanks again man!