Expected HP numbers from new 408 build
11-21-2017, 07:24 PM
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Expected HP numbers from new 408 build Hey guys just wondering if anyone has had a build similar to mine Dyno-ed? Just wondering what kind of numbers to expect. Specs below:
lq4 block
callies dragon slayer crank & h-beams
wiseco -22cc dish pistons
Custom cut ls3 heads 64cc chamber, 255cc intake runner w/ stainless valves
comp cams custom grind: .235/ .246 @ .050" .620/ .615 lift
90mm Holley throttle body w/ Holley high ram intake
compression ratio is 9.7:1
all of this will be behind a brand new j.w. th400 in an fbody with 3.73 gears and a 4000 stall. Working on a turbo kit right now, just wondering what to expect HP wise on motor. Any info is greatly appreciated . Thanks
lq4 block
callies dragon slayer crank & h-beams
wiseco -22cc dish pistons
Custom cut ls3 heads 64cc chamber, 255cc intake runner w/ stainless valves
comp cams custom grind: .235/ .246 @ .050" .620/ .615 lift
90mm Holley throttle body w/ Holley high ram intake
compression ratio is 9.7:1
all of this will be behind a brand new j.w. th400 in an fbody with 3.73 gears and a 4000 stall. Working on a turbo kit right now, just wondering what to expect HP wise on motor. Any info is greatly appreciated . Thanks
11-21-2017, 08:11 PM
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Probably s480. Looking for a t6 hot side at the moment. Or a whole kit. Also plan on running e85. Why wouldn't that cam be good turbo cam? Just wondering, cause comp cams spec'd it for me. It has a 116 LSA
11-21-2017, 08:28 PM
#4
Looks like the EVO opens too early, building more back pressure.
80mm compressor wheel likely wouldn't keep up with a 408 - unless you just want a sub 6500 RPM street car. Otherwise, I'd recommend the S488. And the 96mm turbine T6 isn't enough either for anything other than a low RPM street motor. Need the 100 wheel.
But an 88/100 turbo is a 1500HP turbo. The 80/96 is a 1200HP turbo. But the problem is the 408 is going to have some backpressure issues. The 80/96 is a very good turbo for a 346-370 motor.
80mm compressor wheel likely wouldn't keep up with a 408 - unless you just want a sub 6500 RPM street car. Otherwise, I'd recommend the S488. And the 96mm turbine T6 isn't enough either for anything other than a low RPM street motor. Need the 100 wheel.
But an 88/100 turbo is a 1500HP turbo. The 80/96 is a 1200HP turbo. But the problem is the 408 is going to have some backpressure issues. The 80/96 is a very good turbo for a 346-370 motor.
11-21-2017, 08:34 PM
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That's really what I'm going for is a mostly street application. I'm new to the turbo world, so my mind is still open to a lot of options. Just want a nice, stout build I wouldn't be scared to line up next to anything. Don't get me wrong, it will see it's fair share of track runs lol. Just like the whole street car concept too much to go full drag car right now.