Plenum & Injector Housing Porting

[jss06c6]

Spark Table and Fuel Table, secondaries open.. Black curve is new, red curve is old. AFR hugging 12.8:1..

[XfireZ51]

Originally Posted by jss06c6

Spark Table and Fuel Table, secondaries open.. Black curve is new, red curve is old. AFR hugging 12.8:1..

I found that the area ~ 4500-5500 rpm (max torque) is where the LT5 is prone to detonation. Beyond that, its pretty resistant to knock. The further u crank up timing at the top, the more u just see power drop, but w no indicated knock.

[jss06c6]

Thanks Dom.. How far can I push rev limit without risk to the engine? Seems it wants to at least get another 200 rpm w/o any issue... Not chasing a number by any means, just curious about when the engine begins to roll over.. Porting heads would seem to add more "headroom" as well..

[XfireZ51]

First of all, this is absurd that I try to reply and end up witha Forbidden 404 message. And not consistently. When is this getting addressed?

Steve,

I set the shift light at 7200 and fuel cutoff at 7400. From the last dyno runs I did several years ago, power peaks at 68-6900rpm. I also roll off timing after 7000rpm and fatten up fuel at that point also.

[jss06c6]

Perfect, thanks Dominic!!

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