Best C.I.D. for a TC78...?
Thread Starter
Launching!
Joined: Feb 2011
Posts: 234
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Best C.I.D. for a TC78...? Got a buddy that is looking at getting a TC78 .96 at killer price...
Which naturally started a conversation on what would be the best displacment engine to take complete advantage of this turbo.
We know that it will be exh. limited and that with to many ci. the back pressure gets pretty high and limits its hp and rpm level.
This would be a max effort type build on race gas...Highest hp.
So it comes down to the question of...
More ci. less boost or less ci. and more boost...
Some of the choices are
4.8
(4.8 crank in a ls1 block) (312ci.)
5.3
(4.8 crank in a 6.0 block) (329ci.)
5.7
So...Lets hear it...
What is your opinion on what would match the turbo best...
I like the two destroked combo's...but then I am a bit biased as I have been wanting build both of them for awhile...
And as always, thanks for your input...
Which naturally started a conversation on what would be the best displacment engine to take complete advantage of this turbo.
We know that it will be exh. limited and that with to many ci. the back pressure gets pretty high and limits its hp and rpm level.
This would be a max effort type build on race gas...Highest hp.
So it comes down to the question of...
More ci. less boost or less ci. and more boost...
Some of the choices are
4.8
(4.8 crank in a ls1 block) (312ci.)
5.3
(4.8 crank in a 6.0 block) (329ci.)
5.7
So...Lets hear it...
What is your opinion on what would match the turbo best...
I like the two destroked combo's...but then I am a bit biased as I have been wanting build both of them for awhile...
And as always, thanks for your input...
Check the consumption charts on www.forcedinductions.com and plot the points to see where you are on the efficiency islands.
Thread Starter
Launching!
Joined: Feb 2011
Posts: 234
Likes: 1
They don't have one for the tc78 but the t76 is close enough to use...
The problem is those are only compresser maps...
The problem with the the tc78 that we are looking at from what I can gather, is the size of the .96 t4 housing and its 3" down pipe limits its exh. flow and it build s back pressure.
The problem is those are only compresser maps...
The problem with the the tc78 that we are looking at from what I can gather, is the size of the .96 t4 housing and its 3" down pipe limits its exh. flow and it build s back pressure.
312 would just be cool!
someting that could revv to the sky!!
also there is a group buy for larger turbine housings that you could get in on if you wanted more options for the TC..
someting that could revv to the sky!!
also there is a group buy for larger turbine housings that you could get in on if you wanted more options for the TC..
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Any of those combos will work well but keep in mind the larger the CI the more DD friendly it will be due to more low end torque. Turbo motors are dogs out of boost and the more low end torque you can retain, the better. I would personally do the 5.7 or 6.0L. The small the the motor the more you will shift the powerband to the upper rpms-which is not as usable as low or midrange on the street...
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Any of those combos will work well but keep in mind the larger the CI the more DD friendly it will be due to more low end torque. Turbo motors are dogs out of boost and the more low end torque you can retain, the better. I would personally do the 5.7 or 6.0L. The small the the motor the more you will shift the powerband to the upper rpms-which is not as usable as low or midrange on the street...
10 Second Club
Joined: Dec 2008
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skinnies went 8's with a 5.3 and TC78
you need to do some research
I would run the smallest CI even if it is a street car with the small .96ar turbine housing. I am running the same housing with a 5.7 ltr and it runs wonderful, but the top end could benefit a bit by going with a larger ar housing. I'm not complaining at all just know I would rather have the 1.02 ar or whatever it is over the .96. I have upped my boost with the 5.7ltr and gotten over 780 rwhp at 5800 and it was probibly peaking with the TC76. It all depends on where you want your peak power and what rpms you will mostly be at. If you don't want to rev over 6k then the .96 is your best shot otherwise move up to the larger ar.
We are spoiled with the torque we have with the ls1. Even a 4.8 ltr would have more torque for the street than most people are used too. The 4.8 ltr with the TC turbo would run into less back pressure issues than anything larger.....
Thread Starter
Launching!
Joined: Feb 2011
Posts: 234
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Launching!
Joined: Apr 2010
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From: Sand Springs, OK
http://www.youtube.com/watch?v=QRwmy_FBcjc
That was the tune only 4.8 hauling *** in my 4 or 5000 truck before i threw the blower on it. Halve that weight, and, you still have more then enough torque out of boost to push something.
Thread Starter
Launching!
Joined: Feb 2011
Posts: 234
Likes: 1
