E85 and timing

[wirelessguy2005]

I would like to see what others are running as far as timing goes with a supercharged 4.6 dohc on E85. I am still on the bone stock motor with a KB 2.1 running 11 lbs. Tuner says my timing is at 17 deg., at my most recent dyno session i was making 430 rwhp and 402 torque. Those number seem kinda low to me and I am wondering if it's due mainly to the timing.

 

[biminiLX]

Yes that’s at least 5 degrees low in my experience.
-J

 

[MG0h3]

Yep. Way low. I was on 17* on 91 and 15psi.

Think I’m at 22 or so on 20psi and E85


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[wirelessguy2005]

Thank you guys for the responses. This car is non intercooler as it's a B headed car so I am guessing that's why the tuner made the timing so conservative. Out of curiosity does anyone have a guess at the difference 3 or 4 degrees of timing will make?

 

[biminiLX]

10-20hp/degree depending.
I had assumed stock bottom end and non intercooled were the reasons, but if IATs ok, and you’re only on 11#, then you probably have an easy 50rwhp on the table.
-J

 

[MG0h3]

E85 and timing with no other changes results in @50rwhp if you peruse the distillery threads


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[wirelessguy2005]

Received a new tune and it has the timing at 20 deg. , tuner added timing and took about 2% fuel away. At WOT that puts me in the 7.7 afr on an e85 scale, is that safe enough or would a little more fuel be better? With the new tune the car is running much better at WOT.

 

[blownstang4.6]

My car is slightly different, but here are my results. Stock motor 2004 auto Mach with a Vortech at 11psi. On 93 with 11.25* of timing the car made 460. On E85 with 13.75* the car made 508. For a non forged motor with a non cooled pd blower i think 11psi and 17* is right where you want to be. The numbers do sound a bit low for a 4v.