Marcel Burkett

My three week old T70 went south on me after slight use , ( 8psi max ) I may have to get another one if it cant be repaired , I am thinking of a T76 witha a 1.15 (or 1.22 ) a/r turbine with a Q trim wheel to boost to 25psi for street duty , anyone using this turbo and port combo ? , if so how is the lag / boost response etc.

pillage6

If you are using a half bridge, then your powerband will be pretty high up right?

Then you won't have too much lag since your motor will be spinning at high revs all the time.

turbostreetfighter

that is a lotta turbo for the street, you will have to use race gas to run enough boost for that turbo to work. once you add race gas you are no longer streetable!!! it will be lazy as **** unless you plan on shifting at 9.5k all of the time. my suggestion is to stick with the T70 or even a 66. if you are running pump gas you need a turbo that is more effecient in the lower boost levels. i believe Steve Kan made almost 500 RWHP with a 66 on pump gas without a bridge. bigger is not always better when you are limited by fuel and or RPM's!!

MWW

rotaryengineering

Go with the big Turbo T-76 all the way. I did the step by step upgrades and it cost me a fortune I am much happier with the the larger unit.
Here is the list of paths I took before I was really happy.
Turbonetics 60-1 w/Q-Trim @25psi
Turbonetics 60-1 w/70 Compressor Wheel,Q-Trim @25psi
I wanted to make alot of power at low boost so I went to the Turbonetics T-76 w/Q-Trim @12psi made the same power only a much lower boost level.
If you need any additional information let me know.

Albert

RICE RACING

Thats what I like to hear

I am hoping for the same result with my T51, same power @ lower boost, though this is not my main goal.

turbostreetfighter

rotaryengineering..you are running a automatic tranny right? so am i, but a 5 speed on the street that turbo is going to be lazy. judging by the setup on your car (12 bolt rear end, c4 with a trans brake i am sure) your car is not a street car ( you might get away with it but lets be realistic!!) i have this turbo sitting on my shelf and it is a badass turbo, but this guy said he wanted a street setup and 25psi is not for pump gas. Rice, your car is a circuit only car too!! i am just trying to answer Marcell's Question. if he tells me he has a race car that may see an occasional saturday night romp, then by all means get the 76. but if you are cruising around at 35 mph and a supercharged mustang pulls up next to him , you will get your *** handed to you. now, if you plan on racing a Supra at 100 plus MPH and mostly stick to highway cruising the 76 will be great. Marcell why dont you chime in and tell us what you REALLY do with the car?


MWW

turbostreetfighter

Rotaryengineering, i dont know about your setup but my car will make 1.5 bar on a free rev at 9500 rpms! try that with a 5spd car, you will get .3/.5 bar max!that is with Dual 62mm 'p' trim turbos!!!


MWW

RICE RACING

Marcus has VERY valid points, yeah for those who don't know........ I main circuit race my car and am not into these low speed 2nd gear pull away from cruise speed drags

My version of "lag" is different to others, for me no lag is a majority of boost peak by 6k !

It realy does depend on what your expectations are, as to what you will settle on.

Marcel Burkett

I use the car on a daily basis with intentions of the occasional drag race , as for the 25+ psi I intend to run I am relying on water / methanol injection for boost above 15psi.

Marcel Burkett

If not the T76 , how would a T72 with a Q trim 1.15 a/r turbine perform ?.

crispeed

Hey Marcel
Stick with the T-70. The 72 or 76 will only make a difference if you planned on running 30 psi + on a regular basis. For a street car especially with the mods you have the bigger turbos are not going the give you any more power at the boost level you're going to be running at.

crispeed
87 Rx-7 TII
9.204@150.47mph
2600lbs
un-tubbed

Marcel Burkett

I am looking at a new unit from GARRETT but their sizes and discriptions are different to those of other dealers like TURBONETICS , I found a "good looking " turbo with these specs -
TURBINE - 0.89 a/r , inducer = 3.2475 in
exducer = 2.950in
Compressor -0.72 a/r , exducer = 4.029 in
inducer = 2.938 in
can anyone tell me what it is or what it might be equivilent to amongst the more familiar designations , and last but not least , ........ how will it worh on my engine / port with water injestion and using a larger (1.15 a/r ) turbine housing ?.

sushi

t76 1.22 on half bridge will still be laggy... boost won't peak until over 5.5k or so

fdracer

imo, go w/ the smaller turbo. you can always boost more when you want the additional power at the track, but you can never get quicker spool if you get a bigger turbo. a 66 to a 70mm will be an absolute monster on the street, response and power wise, and you can turn up the boost to 35-40psi when you're at the track. that garrett turbo you're looking at is too damn big for a street car, that turbo w/ the 1.15 turbine would be good for 1000hp.

turbostreetfighter

like i said, go with the 66!! FD is right you can always turn the boost up! and it is cheaper.


MWW

Marcel Burkett

Ok guys thanks I think I will stay with the T70 , but go with a larger (Q trim) turbine.
I only managed to get my car partially tuned (was still a bit rich) to 8psi and I couldnt believe how that Mother F@##er hauled *** , I never felt any thing like that before , my tuner was laughing at me and saying that I hadn't felt the real power yet !!!, he says it would definately run 11's or high 10's (possibly low 10's even).
Boost was at 8-9 psi (WG spring pressure ) by 3500rpm , (and remember that I am running two 35mm gates )in first gear and the rev. limit which is set at 8500rpm comes up very quickly, when the other gears go in , the back squats down and the rear tyres rub inside the wheel wells and fender ( 285 -40-17on 9.0" rims ).I know she will be a monster on the street , I am a bit worried about what will happen at 15 - 20 psi and scared for 20 + psi , so I suppose if all this is happening with the T70 I dont need anymore and will stay with it , thanks again.

TYSON

Where will you buy this one from?

pillage6

That's alot of rpms to be running (43500).

Numbers are numbers, it all depends on how much you can control.

Marcel Burkett

I ag getting it from a GARRETT dealer through a local dealer who is giving a warranty of six months .