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408 Single turbo build. Need Input

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Old Sep 11, 2014 | 08:12 PM
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Originally Posted by Heavy H.P.
So the setup does work and you can get away with the T4 then.
How much boost are you running, would you say the setup is maxed out?
I have gone auto and should have the car on the dyno as soon as I get a converter figured out (prob the beginning of oct). I will push the turbo until it runs out of steam and then if I need to upgrade to a t-6 and new race cover I will.
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Old Sep 11, 2014 | 08:16 PM
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Originally Posted by ghost-1
I have gone auto and should have the car on the dyno as soon as I get a converter figured out (prob the beginning of oct). I will push the turbo until it runs out of steam and then if I need to upgrade to a t-6 and new race cover I will.
Keep me updated on how that goes. I want that kind of setup as a end game. Can't make up my mind to go ahead and buy the PT88 now and run it on my 346 untill I get the bigger motor or just do a 75mm turbo in the mean time.
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Old Sep 11, 2014 | 08:21 PM
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From: ft rucker
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Originally Posted by Heavy H.P.
Keep me updated on how that goes. I want that kind of setup as a end game. Can't make up my mind to go ahead and buy the PT88 now and run it on my 346 untill I get the bigger motor or just do a 75mm turbo in the mean time.
I had a 76mm on my 402 and it ran out of power at 5k pretty hard I would not put a turbo that small on there just my opinion.
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Old Sep 11, 2014 | 08:29 PM
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Originally Posted by ghost-1
I had a 76mm on my 402 and it ran out of power at 5k pretty hard I would not put a turbo that small on there just my opinion.
Exactly
How I was looking at it was like, since the car has the 346 in it now use a 76mm turbo instead of the PT88. Since the PT88 would take all day to spool and so on. Or just go ahead and get the PT88 deal with the spool issues because I plan to do a 408 later.
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Old Sep 11, 2014 | 08:38 PM
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From: ft rucker
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Originally Posted by Heavy H.P.
Exactly
How I was looking at it was like, since the car has the 346 in it now use a 76mm turbo instead of the PT88. Since the PT88 would take all day to spool and so on. Or just go ahead and get the PT88 deal with the spool issues because I plan to do a 408 later.
I think an 88 would spool ok on your motor.
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Old Sep 13, 2014 | 07:34 AM
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Originally Posted by ghost-1
I think an 88 would spool ok on your motor.
On a 346, really?
What type of top end do you have on that 408?
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Old Sep 13, 2014 | 10:36 AM
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i have a 408 with a billet S480 92mm turbine. it spools instantly and still makes 900 horse at 19 psi.
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Old Sep 14, 2014 | 01:49 AM
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From: ft rucker
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Originally Posted by Heavy H.P.
On a 346, really?
What type of top end do you have on that 408?
The turbo on my car made power all the way to 7300 rpm's it never fell off.
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Old Oct 5, 2014 | 11:19 PM
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Originally Posted by ghost-1
The turbo on my car made power all the way to 7300 rpm's it never fell off.
I'm running with the comp ct5x 80/87. It has a t4 flange with a 1.25 a/r and the turbine housing is not a normal t4. It's pretty big and has a 3.5" outlet. I'll run it with my 408 and report back. Comparing it to a normal t4 turbo, it's nearly as big as a t6 on the turbine side. If guys are running those 76mm t4 units on stock displacement engines, I think this will workout. With this hotside setup I am space limited and getting the 3.5" downpipe out will take a little creativity but it's been done plenty of times.

My build is nearly complete. Cold side piping and downpipe left.
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Old Jun 25, 2020 | 08:35 PM
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💀From the grave!
Hows ya'lls 408 with turbo choides go?
Im in the process of gather parts for a future 408 build with and turbo. Im thinking of running an S480 and im curious what the flow difference is between the t4 and the t6 S480s that are out there? Are they negligible or is there a significant backpressure issue between the two?
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Old Oct 16, 2020 | 05:50 PM
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