TC78 vs T76?
Hey Moe,
I honestly don't know. It should make more than the previous setup at the same boost levels. I think that you will make the number in tq, but anything I predict about how it would act up top would be a guess to be honest. My gut tells me that the exhaust housing and those cubes may not be a match made in heaven. Having the most free flowing exhaust would be a plus and would help it out up there.
I'm interested to hear how it will turn out.
I honestly don't know. It should make more than the previous setup at the same boost levels. I think that you will make the number in tq, but anything I predict about how it would act up top would be a guess to be honest. My gut tells me that the exhaust housing and those cubes may not be a match made in heaven. Having the most free flowing exhaust would be a plus and would help it out up there.
I'm interested to hear how it will turn out.
Thread Starter
9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
Posts: 3,672
Likes: 9
From: Colorado Springs, Co/ Central, Ca
Gotcha, Frost do you think I will hit my mark of 750-800 Rwhp with my set up? as follows: Remember that it made 648 RWHP on Pump with 12 lbs and 722 RWHP with the fast gas at 14lbs
Engine: 383 LT4
Heads: LT4 Ported
Intake: LT4
T/B: 58mm
Compression:9:5:1
Cam: 23X-23X/ 588-588 on a 114 LSA.
Tranny: M63
T-76 with a T4 flange and a .96 AR
Engine: 383 LT4
Heads: LT4 Ported
Intake: LT4
T/B: 58mm
Compression:9:5:1
Cam: 23X-23X/ 588-588 on a 114 LSA.
Tranny: M63
T-76 with a T4 flange and a .96 AR
Now take that HP76 turbo and remove the S series compressor cover and the backing plate. Machine a custom backing plate and add the smaller 60 series compressor cover....now it's a "TC76" turbo. Still has the HP76 guts in it.
TC76 is just an HP76 with a smaller 60 series compressor cover for packaging.
Now to add confusion...you can take a HP76 turbo...take off the standard S series compressor cover and add the larger race GTM Compressor cover for even more power....but it's a biggg cover and needs plenty of clearance.
GTM Race Cover 76 turbo > HP76 turbo > TC76 turbo
Hey Moe,
I honestly don't know. It should make more than the previous setup at the same boost levels. I think that you will make the number in tq, but anything I predict about how it would act up top would be a guess to be honest. My gut tells me that the exhaust housing and those cubes may not be a match made in heaven. Having the most free flowing exhaust would be a plus and would help it out up there.
I'm interested to hear how it will turn out.
I honestly don't know. It should make more than the previous setup at the same boost levels. I think that you will make the number in tq, but anything I predict about how it would act up top would be a guess to be honest. My gut tells me that the exhaust housing and those cubes may not be a match made in heaven. Having the most free flowing exhaust would be a plus and would help it out up there.
I'm interested to hear how it will turn out.
Go to the Turbonetics website. Go to the HP76 turbo. That's a "T76" with the regular "S Series" compressor cover. They even have a compressor map for that turbo...that's the "standard" T76 Turbonetics turbo. Turbonetics calls it the HP76....not T76...but it's the same thing.
Now take that HP76 turbo and remove the S series compressor cover and the backing plate. Machine a custom backing plate and add the smaller 60 series compressor cover....now it's a "TC76" turbo. Still has the HP76 guts in it.
TC76 is just an HP76 with a smaller 60 series compressor cover for packaging.
Now to add confusion...you can take a HP76 turbo...take off the standard S series compressor cover and add the larger race GTM Compressor cover for even more power....but it's a biggg cover and needs plenty of clearance.
GTM Race Cover 76 turbo > HP76 turbo > TC76 turbo
Now take that HP76 turbo and remove the S series compressor cover and the backing plate. Machine a custom backing plate and add the smaller 60 series compressor cover....now it's a "TC76" turbo. Still has the HP76 guts in it.
TC76 is just an HP76 with a smaller 60 series compressor cover for packaging.
Now to add confusion...you can take a HP76 turbo...take off the standard S series compressor cover and add the larger race GTM Compressor cover for even more power....but it's a biggg cover and needs plenty of clearance.
GTM Race Cover 76 turbo > HP76 turbo > TC76 turbo
TJ has made more then that, Also Josh from KYTP, and several others are all in the 700-800rwhp range. I think TJ has made over 800rwhp with his TC unit but I could be wrong.
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Yes we have crested 800 to the tires though 22" wheels @20psi. That was with a good bit of back pressure on a 370, so yes it can be done.
We made 655 @14 psi on the same truck on the pump gas tune with the 22" wheels.
We never dyno'd it with the TC78, 1.15 a/r but it traps the same mph now on 15psi as it did before at 19.
We made 655 @14 psi on the same truck on the pump gas tune with the 22" wheels.
We never dyno'd it with the TC78, 1.15 a/r but it traps the same mph now on 15psi as it did before at 19.
Yes we have crested 800 to the tires though 22" wheels @20psi. That was with a good bit of back pressure on a 370, so yes it can be done.
We made 655 @14 psi on the same truck on the pump gas tune with the 22" wheels.
We never dyno'd it with the TC78, 1.15 a/r but it traps the same mph now on 15psi as it did before at 19.
We made 655 @14 psi on the same truck on the pump gas tune with the 22" wheels.
We never dyno'd it with the TC78, 1.15 a/r but it traps the same mph now on 15psi as it did before at 19.
LOL...new meaning to Fast DUB's
Well this sounds a little more encouraging, I was getting a little depressed. But I dont think I will make my mark of the 850 RWHP I was hoping for, I might have to settle for hopefully 750 RWHP...Dam!
Well, if you have the space for it, and you can deal with and a little extra lag, you can always look at the Borg Warner units S400 to meet and exceed your 850rwhp goal. I have been stuck between a nicely done TC78 or a BW S400-80/ ST-80 (similarly priced). Hard choosing between more lag with the Borg or quick spool but lower rev limit with the TC. The TC78 is a dream in terms of power output, compact and light, and very affordable, it just doesn't let me spin the motor as high as I intend to. I keep hearing the TC will be peak out start dying out before 6K on my 370. With my 232/240 115lsa cam, I might be forced to deal with some lag on the S400 to be able to spin my set-up as I intended.
Well, if you have the space for it, and you can deal with and a little extra lag, you can always look at the Borg Warner units S400 to meet and exceed your 850rwhp goal. I have been stuck between a nicely done TC78 or a BW S400-80/ ST-80 (similarly priced). Hard choosing between more lag with the Borg or quick spool but lower rev limit with the TC. The TC78 is a dream in terms of power output, compact and light, and very affordable, it just doesn't let me spin the motor as high as I intend to. I keep hearing the TC will be peak out start dying out before 6K on my 370. With my 232/240 115lsa cam, I might be forced to deal with some lag on the S400 to be able to spin my set-up as I intended.
Thread Starter
9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
Posts: 3,672
Likes: 9
From: Colorado Springs, Co/ Central, Ca
I currently have the small cover TC76, .96AR, P trim wheel. Im wanting to try the T78, 1.15AR, S, or F1 wheel like you said. Could that swap be worth a couple tenths on a low sec truck? 
