What kind of numbers should I expect? 408 & 76mm
#1
Staging Lane
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What kind of numbers should I expect? 408 & 76mm
I have a 76mm turbo with a large housing (something like a 96mm with a t6 flange). I am having a forged 408 built for it. What kind of HP would I get through a ported ls2 and a large fuel system. 96# injector, twin bosch pumps, etc...
I am wanting something close to 1000 hp. Is it possible with this setup? I've been told this turbo would make a lot of power because of the larger housing size and the t6 flange. What kind of boost do I need to run to get the numbers?
Thanks for the input.
I am wanting something close to 1000 hp. Is it possible with this setup? I've been told this turbo would make a lot of power because of the larger housing size and the t6 flange. What kind of boost do I need to run to get the numbers?
Thanks for the input.
Last edited by mtb989s; 07-29-2006 at 10:42 PM.
#2
TECH Regular
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a standard t76 is a little small for a 408 cube engine. especially if you are trying to get 1000 hp. a t76 is rated at 950 hp. but that is at around 30psi. you will be off the map with a 408 at @ 1000hp. I would look at something a little bigger. like maybe an 88. better yet, talk to Jose at forcedinductions.com. he can hook you up with the best turbo for your combo.
Last edited by sr71; 07-29-2006 at 11:14 PM.
#4
I think it will work well. A good T76 compressor will flow enough air for 1100+ hp. A built 408 will make 1100 hp at 15-17 psi. Sure, at 100 lb/min and 2/1 Pr, it isn't the most efficient turbo, but it will support the air flow required. It will work especially well with the T6 exhaust side.
Mike
Mike
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#9
TECH Junkie
iTrader: (14)
Originally Posted by sr71
I could be wrong, Mike. but my compressor map shows 100 lbs/min not even hitting the map. 90 lbs/min barely hits the edge of the choke line. but I'm no expert. that's for sure.
#13
single digit dreamer
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i had the basic t76q trim on a 408. best i could do was 640rwhp. i do have a lot of driveline losses. the basic t76 is fun on a 408, it spools real fast but it's too small if you want to push it to 1000rwhp. i dont really know what compresor you are talking about up top.
#15
Banned
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Originally Posted by DrTurbo
You need to go with an S76. Its probably the most powerful 76mm unit on the market. Uses T6 flange, big turbine....etc.
#16
TECH Senior Member
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Originally Posted by Toonz
The GT42-76mm we had on my little bro's car couldn't support his 370 cu in block. I'd upgrade to the 88 if possible.
yep yep.... its not going to work very well.....
14-15 psi was all we could muster out of the ol GT42-76 and the intake temps were in the 200+ degree area also... not a good idea...... i have a 370 so a 408 is a wayyyy NO NO. Sorry.
Kyle
#17
Originally Posted by parish8
i had the basic t76q trim on a 408. best i could do was 640rwhp. i do have a lot of driveline losses.
After a cratered motor, I destroked down to 363 cid based on peoples' advice that 383 is too many cid for a T76GTS. It never performed as well as the 383, even with a bigger intercooler, no boost leaks, and bigger throttle body. After cratering the 363, I'm going back with cubes. This one will be a 388 and I can't wait to see the results.
Mike