My 625 dyno graph
ya what the hell is that dip? Otherwise that is some nice numbers. Kinda confusing since you have the dark blue line as the HP bt the dark red line as the TQ. How come you spun it alot higher with the old turbo but cut off at 6k with the new one? GL man
John
John
IMPRESSIVE!!! Your numbers are better from 3000rpm up...so this bigger turbo is spooling well.
Having looked at a number of your posts, I am not clear about the 'custom mounted' part...what have you done differently on your plumbing? I am curious as I've just finished my STS install on my LS2GTO. I went w/ a GT67 turbo...and have both .81 and .96 exhaust housings to play with for comparison. This is the first STS on an LS2 engine...so the 'optimum' is unknown. The hard part is waiting for another week until I get this thing tuned down in Mobile @ RWTD...don't like having to 'baby' it around.
Having looked at a number of your posts, I am not clear about the 'custom mounted' part...what have you done differently on your plumbing? I am curious as I've just finished my STS install on my LS2GTO. I went w/ a GT67 turbo...and have both .81 and .96 exhaust housings to play with for comparison. This is the first STS on an LS2 engine...so the 'optimum' is unknown. The hard part is waiting for another week until I get this thing tuned down in Mobile @ RWTD...don't like having to 'baby' it around.
If you are running a EBC they can cause dips like that if you passed the limit you set them at. For example if you set them for 14psi and they see 15psi they will pull boost out which can cause dips like that. Just my 02 cent.
the dips are where it spun on the dyno. It needed to be strapped down better. I stopped the pull early because it didn't feel right, I also noticed it was starting to lean out pretty good.
Last edited by Zombie; Aug 21, 2005 at 06:46 PM.
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Originally Posted by MTBDOC
IMPRESSIVE!!! Your numbers are better from 3000rpm up...so this bigger turbo is spooling well.
Having looked at a number of your posts, I am not clear about the 'custom mounted' part...what have you done differently on your plumbing? I am curious as I've just finished my STS install on my LS2GTO. I went w/ a GT67 turbo...and have both .81 and .96 exhaust housings to play with for comparison. This is the first STS on an LS2 engine...so the 'optimum' is unknown. The hard part is waiting for another week until I get this thing tuned down in Mobile @ RWTD...don't like having to 'baby' it around.
Having looked at a number of your posts, I am not clear about the 'custom mounted' part...what have you done differently on your plumbing? I am curious as I've just finished my STS install on my LS2GTO. I went w/ a GT67 turbo...and have both .81 and .96 exhaust housings to play with for comparison. This is the first STS on an LS2 engine...so the 'optimum' is unknown. The hard part is waiting for another week until I get this thing tuned down in Mobile @ RWTD...don't like having to 'baby' it around.
The .96 a/r housing is probably going to be too big for the setup. The .81 should work nice though. If I was going to reccomend a turbo for a LS1 based car i'd suggest a .68 a/r T70. The .68 housing makes it a lot more fun to drive. Good luck with the LS2 project. If you can lower the comp down to somewhere in the 9's it will be a lot more fun. The other choice is more octane. Methanol is AMAZING.
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Verdad Gallardo 507 on 10 psi, i was pushing it to 15-16 at times though, but never ran at the track or dyno'd. Most of the time I ran at the track was 13 and sometimes 14 if it would get there.
I'm still on a stock bottom end.
I'm still on a stock bottom end.
Originally Posted by gametech
As far as street driving impressions, did the 76 give up any power on the low end? On my gto I'm not going for best track times, I'm going for most fun daily driver.
This turbo will be going on my 408 when ever I build it.
Originally Posted by JZ 97 SS 1500
Get a smaller A/R on that thing. You have a crazy amount of lag for a 346ci motor. Here is a 2JZ with a 76GTS, non Ball bearing turbo and .81A/R.
Jose
Jose
I'm use to them being much cheaper. I'll live with it the way it is for now. My solution is not a smaller housing, just a larger motor. I'm probably going to leave the .70 a/r on it initially and see how it works. I'll most likely tap into the exhaust and install a gage so I can monitor back pressure.I'm still having wastegate issues. I have a 9 psi spring in there but it's only showing the same as my 6 psi spring. Time for a 11psi spring to see if that increases spool. The car will not hit full boost on the dyno.
I agree with you though, it could use a smaller housing. I think all the STS 67's should have a .68 housing to be sized properly. The .81/s they are shipping them with just seem to laggy for a p-trim 67.
It's one of the down sides to having the turbo in the back. The plus side is that I have a turbo on my car though and thats a HUGE plus
Originally Posted by JZ 97 SS 1500
Ditching the R-trim wheel would help a good bit. Its a very heavy wheel/shaft combo.
Jose
Jose
Originally Posted by red91z
I run the .96 housing on the 67 turbo and it made almost 20HP over the .81. That is on a stock long block ls1.