New Project 408 and GT 42 76 Turbo Rear Mount
10-17-2006, 05:49 PM
#1
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New Project 408 and GT 42 76 Turbo Rear Mount Well guys what kind of HP do you think I can get out of this setup ?
Here is what I have so far,,,2000 C5Corvette,Auto Built by Rodney 373 Rear And Hardened Output Shafts 408 Stroker iorn block ETP 255 Heads 72cc all the best internals fully coated pistons
Custom Fuel System,, 96 lb Injectors with converter ,HPTuner 3 Bar Tuning
We are using the sts oiling system
As soon as we finish this we will be taking it to EPP for tuning.
I will also be taking My T88 Corvette to them to get a real tune
We are doing a GT 42 76 on rear,
Want some input
Here is what I have so far,,,2000 C5Corvette,Auto Built by Rodney 373 Rear And Hardened Output Shafts 408 Stroker iorn block ETP 255 Heads 72cc all the best internals fully coated pistons
Custom Fuel System,, 96 lb Injectors with converter ,HPTuner 3 Bar Tuning
We are using the sts oiling system
As soon as we finish this we will be taking it to EPP for tuning.
I will also be taking My T88 Corvette to them to get a real tune
We are doing a GT 42 76 on rear,
Want some input
10-17-2006, 09:17 PM
#7
Originally Posted by RealQuick
It will be fine as a rearmount. Frontmount efficiency is not the same when its a rearmount. If you are shooting for 800hp like you stated in the other post, I think you'll get there.
Originally Posted by y2khawk
you WILL run out of turbo, it's way to small. Especially for a 408.
Right Right.....
Harlan knows because he's Talking about my car.....
38 cubic inches less then your 408 with the T6 Flanged GT42-76.....
We were out of steam by 14 psi..... way to much back pressure... so much we were getting valvefloat like crazy......
Swapped to the S88 and went 8mph faster in the 1/4 mile and almost .7 tenths quicker with 1 psi less boost..... now if that doesnt tell ya nothing will
Kyle
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10-18-2006, 12:17 AM
#9
Originally Posted by RealQuick
It will be fine as a rearmount. Frontmount efficiency is not the same when its a rearmount. If you are shooting for 800hp like you stated in the other post, I think you'll get there.
And Kyle's not exactly right, the backpressure wasn't that bad. About 2:1, reasonable but not ideal. A larger motor will just make it worse, no matter where the thing is.
It was just out of compressor.
10-18-2006, 07:35 AM
#11
Originally Posted by y2khawk
nothing to do with efficiency, all about flow at that point.
And Kyle's not exactly right, the backpressure wasn't that bad. About 2:1, reasonable but not ideal. A larger motor will just make it worse, no matter where the thing is.
It was just out of compressor.
And Kyle's not exactly right, the backpressure wasn't that bad. About 2:1, reasonable but not ideal. A larger motor will just make it worse, no matter where the thing is.
It was just out of compressor.
10-18-2006, 08:44 AM
#12
Originally Posted by RealQuick
It may just be a tradeoff then between limiting the HP with a smaller turbo and having a half decent spool. Its up to the poster to decide what the car will be used for and how lazy he wants to make it.
Theres nothing lazy about my 88mm turbo on my 370...... he's limiting his self alot by going with that turbo...from the look of it it see's the track quite a bit.....
10-18-2006, 09:47 AM
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Hey John
I wish I would have listened to guys last year when I was having my car tuned, I can't say the name here it is a bad word here
how ever if you look back at my past post you will see how, his tuned sucked azz
Anyway We went with this turbo because of spool time, I didn't feel that the T88 would have worked as well on the rear mount, now on my corvette the 88 works great with 0 spool time.
So you guy don't thing we will get close to 800hp ?
I might need to rethink what I'm doing here
So what Turbo do you guys think I should go with ?
Thanks guys
Dave
I wish I would have listened to guys last year when I was having my car tuned, I can't say the name here it is a bad word here
how ever if you look back at my past post you will see how, his tuned sucked azz
Anyway We went with this turbo because of spool time, I didn't feel that the T88 would have worked as well on the rear mount, now on my corvette the 88 works great with 0 spool time.
So you guy don't thing we will get close to 800hp ?
I might need to rethink what I'm doing here
So what Turbo do you guys think I should go with ?
Thanks guys
Dave
Originally Posted by Pro Stock John
Sounds like a fun build. I'd listen to the turbo gurus posting, they can save you some wasted time.
10-18-2006, 10:02 AM
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Originally Posted by VINCE
I say dont sell yourself short!!! GT55-91 all the way...
i dont know how it would react with a rear mount setup, but my 408/gt55 made 833 rwhp on pump gas.
10-18-2006, 10:52 AM
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I'm really wanting to get away from Nitrous.
Are you counting days until you get home
Are you counting days until you get home
Originally Posted by VINCE
GT55-91 is your friend Dave. If you are really worried about spool then bring in your other friend named nitrous..
10-18-2006, 11:01 AM
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Originally Posted by David Dillon
I'm really wanting to get away from Nitrous.
Are you counting days until you get home
Are you counting days until you get home
