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907rwhp

 
Old 07-21-2018, 07:40 PM
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04 silverado with an s485, 6.0. stock 706 heads, hi ram, studs, 22# and 21* of advance past peak torque. .81 lambda because the twin 450s and 210s were at 112% duty cycle.. so we couldnt go up in boost. 3rd gear pull unlocked 80e with a 252 circle d converter, the dip at the end of the curve is the lack of fuel pressure. 907rwhp.. was expecting more power but thats what it made.




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Old 07-22-2018, 08:48 PM
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First time out, 4500lb truck
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Old 08-02-2018, 11:38 AM
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Nice setup!
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Old 08-02-2018, 01:07 PM
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I’m confused by the lack of fuel issue? Is it on m1 or something? Shouldn’t twin 450’s be good for a lot more power?
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Old 08-02-2018, 03:17 PM
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That is weird. Dual 450s and 210# injectors should support that...

What turbo kit is that? Or homebrew?
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Old 08-02-2018, 03:46 PM
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Its on E
and well duty cycle was done so not sure what else to say. I'm sure it was the high base pressure causing the lack of fuel.
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Old 08-02-2018, 04:01 PM
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That could be, the 450’s nose dive hard after 60#, I have the same setup being dyno tuned the 31st, I bet your loosing fuel pressure and the injectors are trying to make up for it. I wouldn’t be surprised if you backed off your fuel pressure if it wouldn’t support more.
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Old 08-02-2018, 06:12 PM
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Set them at 3-bar and go from there. Even on E85... that should do more.

What's the wastegate situation? And I assume the T6 1.32 A/R exhaust housing?
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Old 08-02-2018, 10:03 PM
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unfortunately the base couldn't be brought down, the return was too small so the regulator couldn't maintain a 3 bar pressure. Hence I just decided to tune it like so since they brought the vehicle from a ways out with a couple hours notice. The wastegate works perfect, and yea I am sure its the pressure that is killing these pumps up top. Its a t6 1.32 96mm turbine, best time is a 6.0 at 116 in the 1/8th before the stock 80e input shaft broke on the launch
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