Nickn20

T76 time

squirrel masta

what are you guys talking about when you are saying the turbo is burning oil.i have that kit and im installing it shortly but i only plan on running 8 lbs max prob less will i still have this problem or is it just cause you are running it a lot harder thanx guys

gogogadgetcar

I doubt youd see the same problems (hope not)
He thinks he is over reving his turbo which is causing it to burn the oil

MelloYellow

I know a lot of people like the T70/T72/T76's, but if I recall the numbers, the T68 or 68-1 was the best match flow wise/efficiency wise for a 348cid LS1.

rodent

iTrader: (1)

Great Googly Moogly!!!

Awesome torque! I'm doing a larger turbo with TEC on my QMP kit Dave. Me and Jim (at TEC) went over my specs and found one that should support over 700rwhp. Its also water cooled. Cost is around $1100 for the turbo. The AR housing is .96 and fits fine. The only thing I don't like is how the standard 4 bolt turbo flange on the turbo doesn't align that well with the exhaust manifold hole. I'll have to port the turbo ex. inlet to match. I'm also doing a SS flex pipe on one of the waste gate tubes to allow for the heat expansion. Its too bad we can't fit a 3.5" or 4" downpipe in our cars.

frcefed98

iTrader: (16)

Damn! Great torque numbers. Too bad the boost drops off like that. Did you recheck all the hoses/clamps for leaks? Probably checked em.... but 720 lb ft
J

MIGHTYMOUSE

iTrader: (59)

only thing i have not verified is a massive hole that could be in the back of the intercooler.. which i doubt.
rodent, you got any links for tec? i sure would love to 'try' one but i refuse to pay (again) for something i allready paid for once, catch my drift?

i will just have to see what rob and precision think about the whole thing monday..

rodent

iTrader: (1)

I know what you mean. The place I've been going to is:

http://www.turboengineering.com

Nice for me since its local and they know thier turbo's.

buschman

Awesome Dyno Dave. Area under the curve looks good. Your peak HP comes on fast and stays level. How were your wideband readings? Congrats bro.

Mike

MIGHTYMOUSE

iTrader: (59)

no a/f meter hooked up at the time other than good ole a-tap which i have done 100% of my tuning (myself) with; and they were in the .940's

smokinHawk

iTrader: (48)

amazing torque numbers.

that 720lbft is that were your boost spikes up to 18psi?

Black LS1 T/A

MightyMouse, that is GREAT!

I do think exhaust restriction is a prohibitive factor.

So far I've only gotten up to a peak of about 9# (the meat of it 5 PSI at 5000 and rising) and put out 507 RWHP, 622 RWTQ.

When my setup got me 6# by 5000 RPMs, but rose no higher than 6#, I got 505 RWHP, 656 RWTQ. (TQ was higher because I punched it earlier, where there was more torque. TQ figure matches at the same RPM point.)

When I got 8 PSI by 5000 RPMs and no higher, I made 526 RWHP and 655 RWTQ.

In each case, the RWHP number was very flat. I had peak RWHP at close to that 5100/5200 RPM point and it did not drop off until about 6500 RPMs.

Once I get my setup where I can get 12 or 13 PSI of boost, I don't plan to take it any higher... or, if I max out these injectors. But, the dyno guys and I can see already, that exhaust restriction is going to be a BIG inhibitor for my HP number.

gogogadgetcar

Wow you did all the tuning yourself? thats quite the accompishment. You've successfully tuned your car, on pump gas no less, to the limits of the T-63E QMP turbo kit. Good Job

I realy don't think anybody will dyno too much more than you did with that turbo. If they do they'll probably be on the stock motor with the higher cr and higher octane.

If you get a turbo on there that will hold 18psi...look out!!!

ChrisB

Have you considered plumbing a guage to measure backpressure? Also what camshaft are you running - I know one of my roomates had an almost identical issue with his LT1 t-76q trim - tremendous torque, but laying over at 5k or so. Currently he is thinking it's the camshaft (217/213 cam motion grind) - and a slightly larger one will be taking over. The turbo is definitely not maxed out, and backpressure was reasonable.

MIGHTYMOUSE

iTrader: (59)

my cam is 224/226, .510/.523 115*

yes the tq graph looks exactly like what the boost did. shot up then fell straight down.. somewhere around 18 at peak though i did 3 pulls turning in my mbc every time to no avail.

well the kit does have the log style manifold which is the same that george at turbotech admitted was the reason their kits are maxed out no matter the combination around 500rwhp..

but rob did make 700rw with his car, and i assume that that configuration is what spawned his production kit..but having not seen pictures of the details, cant confirm.

i do have a extra 02 sensor hole that i could put a pressure meter in, but i'd rather not foot the bill for that equipment ya know.. it shouldn't be my problem

i did make a misquote from precision and edited it.. they are confident the te-63 which i have will do 740 flywheel (not the t-63 which is 690)at 30psi.. i just have to get it there.. me not wanting to run 30 psi puts me at needing around a 71GTq for 15psi in the mid 600's rwhp. im not sure what the miscommunication was between them and qmp about their boost/output specs.

Warbird

Robs 700 hp car was done using a passenger side header and a 3" cross-over. I just bought one MAC shorty header to replace the stock log. I will see if I can get it dynoed at ARE before and after with no other changes to see what happens.

I'm thinking I should call Rob myself and ask for the T76 Ball Bearing turbo we talked about to replace the T74 Thrust Mount I got

MIGHTYMOUSE

iTrader: (59)

i talked to precision and qmp today, both suggested i go bigger with the turbo at my own expense.. that my specific combination is just not cabable of using the 63 to its maximum boost.

White_Hawk

iTrader: (3)

Did they tell you specifically what specific thing in your combination is limiting you? I'd make them narrow it down a little if you are serious, especailly if it is your passenger header or crossover pipe.

-Geoff

A DEE O

iTrader: (2)

Maybe that explains why the power is down from what was originally posted? That sucks!

Mark C

If you are maxing out the intake or exhaust airflow, I'd think a larger turbo would not make any more power. If you are not, the turbo is not making nearly what it should.

Are you sure its not a controller issue. Did you try to set it at, say 10 - 12 psi.? Does it still spike, or is it steady to redline?