Mikko

I´m running with 10psi boost and 10:1 compreission ratio on my LS3, E85 in tank. Max power comes with 7 degrees advance, isn´t it quite late with e85? Pushing 770hp/975nm fwhp.

Is this is "off" from normal standars, what could cause this? Cam ->

https://farm1.staticflickr.com/357/1...7376b936_b.jpg


Too restrictive exhaust? long tube headers with 1 3/4 primäry, 3" collectors and 2.5" free flow twin from there with x-pipe. Exhaust is restrictive for sure, have had allready couple of blown header gaskets and 3" twin exhaust is next on work list, but will it affect how much on else but power...?

Also this is bit strange, i have 125lbs injector, usage rate is about 80% at 770fwhp, it was about same ratio before with smaller injectors, needs lot of fuel for it´s power.

LJMSJohn

Blower... turbo??

Mikko

Blower, Paxton Novi 2200

LJMSJohn

not enough exhaust lobe for a Novi 2200.... Too much overlap for an LS3 head....

Get that 2.5 exhaust off and at least a 3 inch on it... necking down the exhaust is never a good idea.

Ben.

My 8:1 383, standard 241 castings, s400sx3, 28psi, 22* timing. I thought it looked a bit excessive but haven't checked with a timing light (dyno verified that the tune is happy there).

Mikko

Can you explain this bit more. Are you meaning lobe lift? Too much overlap? how does this affect.

LJMSJohn

Not enough duration....