TC78 and 408cui build
06-15-2009, 09:02 PM
#1
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TC78 and 408cui build few people say the .96ar tc78 w/ 68 turbine is to small for a stock headed 408cui..
few say its fine?
what say ye?
on other option for me is a pt88.
few say its fine?
what say ye?
on other option for me is a pt88.
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06-16-2009, 12:14 PM
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Is this a street car, or strip car? Front mount or Rear mount? Jose of Forced Induction Inc. recommended a TC76 for my rear mount 402cu street car. Also, there's been no mention of your power goal.
Last edited by Karpellarpy; 06-16-2009 at 12:14 PM. Reason: adding additional information
06-16-2009, 12:46 PM
#9
Rear mount recommendations will be way different then front mount depending on the level of power you are trying to run. A TC76 for a rear mount 402 will work beautifully up to 650-700rwhp. Put that same turbo on a front mount 402 and it will choke like a rock.
06-16-2009, 12:48 PM
#10
Without a power goal no one will know. For modest setup, the TC78 will work with a 1.15A/R being stock headed makes a nice difference. Now using big heads and looking for a 1000rwhp.....no. You would need a GT88 or GT47-88, or even a GT5018.
06-16-2009, 12:53 PM
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my goal started out in the 800hp range.
realistically, more like 650-750 whp
This is a street car, so I dont plan on taking the 408 much past 6000rpms.
I know if I do use the tc78, I will have enormous instant torque but like steve told me, it will nose over around 5000rpms and stop making power.
realistically, more like 650-750 whp
This is a street car, so I dont plan on taking the 408 much past 6000rpms.
I know if I do use the tc78, I will have enormous instant torque but like steve told me, it will nose over around 5000rpms and stop making power.
06-16-2009, 01:42 PM
#12
Chris!!! I didn't realize this was you. Though I did think to myself "man haven't I heard these questions recently?" 
If you don't want to make more than 650-750 and don't mind being a little RPM limited, the PTE88 may be an option, but that many cubes will really appreciate a better exhaust side.
If you don't want to make more than 650-750 and don't mind being a little RPM limited, the PTE88 may be an option, but that many cubes will really appreciate a better exhaust side.
06-16-2009, 01:45 PM
#13
I have a 3900lb car that traps 136mph through a TH400 on 15psi with a 5000+ DA and is horribly inefficient (2.25"-2.5" IC Piping). Anyone is welcome to copy it. It's a **** ton of fun to drive on the street, haven't lost to a liter bike on the highway in a long long time.
With a 408 I'd step up to something like GT47-88 myself as long as a 1.0+ divided housing was available so I could use my quick spool valve.
Sizing a rear mount turbo gets trickier when you run an anti-turbo trans like a 6sp.
With a 408 I'd step up to something like GT47-88 myself as long as a 1.0+ divided housing was available so I could use my quick spool valve.
Sizing a rear mount turbo gets trickier when you run an anti-turbo trans like a 6sp.
06-16-2009, 03:02 PM
#14
I have a 3900lb car that traps 136mph through a TH400 on 15psi with a 5000+ DA and is horribly inefficient (2.25"-2.5" IC Piping). Anyone is welcome to copy it. It's a **** ton of fun to drive on the street, haven't lost to a liter bike on the highway in a long long time.
With a 408 I'd step up to something like GT47-88 myself as long as a 1.0+ divided housing was available so I could use my quick spool valve.
Sizing a rear mount turbo gets trickier when you run an anti-turbo trans like a 6sp.
With a 408 I'd step up to something like GT47-88 myself as long as a 1.0+ divided housing was available so I could use my quick spool valve.
Sizing a rear mount turbo gets trickier when you run an anti-turbo trans like a 6sp.
It's not a rear mount I don't think, AFAIK he told me he had (or could use?) one of John Pham's front mount kits.
06-16-2009, 03:58 PM
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yea steve 3+3 IS 7 lol
spot on its a Pham kit (under the K, tubular manifolds). really still a nice kit for an unlowered car.
I'm leaving the 317's bone stock... either way a 408 is going to move air like a 400+ cube motor. a guy on here offered his pt88... so that what I'm going with.
need to find a buyer for this tc78 and I'll be on the horn with you steve.
spot on its a Pham kit (under the K, tubular manifolds). really still a nice kit for an unlowered car.
I'm leaving the 317's bone stock... either way a 408 is going to move air like a 400+ cube motor. a guy on here offered his pt88... so that what I'm going with.
need to find a buyer for this tc78 and I'll be on the horn with you steve.
