Typical advance with E85/ 10psi boost? And couple other issues...

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Jul 14, 2015 | 10:52 AM

Mikko

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Typical advance with E85/ 10psi boost? And couple other issues...

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.

Jul 14, 2015 | 11:05 AM

LJMSJohn

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Joined: Aug 2014

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Blower... turbo??

Jul 14, 2015 | 11:10 AM

Mikko

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Blower, Paxton Novi 2200

Jul 14, 2015 | 01:01 PM

LJMSJohn

FormerVendor

Joined: Aug 2014

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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.

Jul 14, 2015 | 07:51 PM

Ben.

Staging Lane

Joined: Jun 2015

Posts: 96

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From: Melbourne, Australia

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).