Big Block Chevy Ing Timing
 

Looking for a little guidance here in regards to my ign timing map for my 468. This is an EFI engine controlled via a AEM infinity, running at 575sci blower with the smaller pulley (8ish psi) and intercooler, roller cam. Not looking for max power just reliability and a safe tune on 93. Any thoughts / concerned with this timing map ?

https://cimg3.ibsrv.net/gimg/www.off...1a8dc93d8d.jpg

yeah, way to low imop.
20* at 6K with 9lbs? How hot would those exhaust valves get holy cow.It`s not an LS
I wouldn`t be under 31*

https://cimg4.ibsrv.net/gimg/www.off...54f3b0b3dd.jpg

Before anyone can give a recommendation, what's the compression?

that would be useful info :). Its 8.25:1

yeah it looked low, it was just the base map but I am more familiar with Imports with higher revs and much higher boost. Thanks for posting your table.

Made a few tweaks.
https://cimg4.ibsrv.net/gimg/www.off...2c160a8bef.jpg

I'm not familiar with boosted motors, but a have advanced the timing on my mefi 3 mpi by quite a bit and talk about feel like a different motor. Gained 3+ mph. I like the chart tinimg ICEDEDPPl has around the 0 manifold pressure area. Mine's actually a couple degrees higher for the same RPM/man pressure, but i do always run premium and i am not having to drive a blower either. I appreciate all the knowledge that others give on here. Thats how i started learning, along with a LOT of trial and error. LOL.

Good luck.

I remember you asking about adding timing. How much did you end up adding?

tomz, stock was 29 or 29.5 but not until got righ t at WOT around approx 4800/4900 or so, I dont recall exactly, would have to look at the mefi3 tables. I went to 34 deg at 2500 rpm, 35 deg at 4800rpm. Only run premium.

Would have been fun to try when I had it running the MPI. Totally different now.

TOMZ, when hitting WOT at mid engine rpm, the orig factory timing would drop to 20 deg and until it hit high rpm. When i redid the timing on a sraight climb to go from 15 deg at1500 rpm, to 34 deg at 2500 rpm it made a world of difference in torque. Felt like a different motor. Had never had issues.

I do always run premium fresh gas though. It might be okay on regular, I am just not going to risk it. See too many rebuilt motors from detonation on regular gas and sometimes old gas.