Rogue_Ant

Great power - must be a blast to drive!

BTW your power divided by two doesn't even get you on the list, lol

333pg333

What would this size turbo compare to against a Garrett bb turbo? What other mods on the car? Do you have EMS or piggyback?
Cam, headwork?

NZ951

Garrett turbos eat the old KKK stuff for breakfast. I really believe the K26/K27 are well undersized for the 2.5 motor. I would think you wouldnt go past a GT3582 with a .82 turbine as a minimum.

333pg333

Duke ran one of those on his 2.5L and it was really too laggy. I was just wondering what that turbo above compared to against a GT one in size/spec as his hp looks very good on a Dyno Dynamics dyno. It looks to perform waaaay better than my GT3076R.

NZ951

I guess it depends on the application, personally I would prefer to gear the car for high HP high RPM over low / mid range torque. The small turbine housings used just choke the 2.5, the #8 is less than a .63, and when I went from the #8 to a .63 I picked up a lot of power over all the rev range, I would have liked to have tried a .82.

Duke

A GT3582R .82 is a great 500-600 rwhp turbo. Less than that and your're not getting the most out of it and could be faster with another turbo.

333pg333

When I said to compare the turbo to 'above' I meant this one:

"The turbo I believe is a k26 with a k27 turbine and a #10 hotside which would explain the power numbers. 333 rwhp and 340 rwft/lbs at 16psi"

So is a 10 hotside like an .82?

Duke

A 10 is much smaller than a 0.82

333pg333

Well that's just very interesting isn't it....hmmm....

Another interesting thing is that it seems that GTS headlights are popular going by the avatars on this page.

ptuomov

It is fun to drive. Even though it's 689 rear axle hp with the current boost program, it's still manageable to drive with my 255 RE050As when they are warm. In the earlier tune with a flat boost program of 14 psi, it made 617 ft-lbs at low rpm, which was a bit too much for the tires. By lowering the boost in the mid range and increasing it above 5000 rpm, I smoothed out the torque curve a bit and that helped a lot with traction.

I have a low-compression engine (currently my avatar) waiting for this current one to blow up. Then the "divided by two" power maybe also more interesting.

Constant boost runs, the highest with 14 psi:


Rpm-specific boost profiles, with about 10 psi int he mid range and as high as 17.7 psi in the top end. I changed the settings between runs just to get some data, hence the dispersion across runs at the top end:

Duke

And vented hoods a close 2nd

Rogue_Ant

LOL - no not a close 2nd... I have the Turbo RS style vent in my hood as well. I haven't updated the avatar since I did that mod.

Rogue_Ant

Any pics of a #10 compared to a .82? I have a hard time believing that the #10 is "much smaller". If anything I would guess the #10 to be close in size to the .63, perhaps a bit larger.

Well if he is running a K27 compressor with a #8 turbine, then a similar physical size GT would be the 3071R for the compressor.
The #8 turbine wheel is very close in size to the older T3 stg II turbine, or the GT2871R turbine. Keep in mind that the GT turbine wheels flow tons better given the same size.

333pg333

Well whatever it is, he's getting a much better power figure than me on a much lower boost level. Same brand of dyno. Clearly there can be other mitigating circumstances.

elargentino

Wow - just stumbled across this thread by accident.
I love this forum.