E85 wot spark advance

Blkhoess · 02-12-2018, 09:15 AM

Average wot timing on e85 n/a
Thanks in advance

cmitchell17 · 02-26-2018, 06:40 PM

I get about 24-27 rising as RPMs climb at WOT. With the stock tune with the stock E85 adjustment tables its a couple degrees lower than that.

I've tried to read research papers on the topic on proper timing for alcohol and haven't really got a good answer. Basically sometimes it requires more and sometimes less. GM seems to think the same way based on their alcohol adder table.

But if you actually look at a flex fuel truck engine tunes, its all over the place, but the flex fuel adder for the trucks is about adding 5-10 degrees at WOT but actually pulling 4 or 5 degrees at low load.

02-12-2018, 09:15 AM	#1
Blkhoess Drives: Black ss Join Date: Jun 2017 Location: Louisiana Posts: 16	E85 wot spark advance Average wot timing on e85 n/a Thanks in advance Last edited by Blkhoess; 02-12-2018 at 04:04 PM.

02-26-2018, 06:40 PM	#2
cmitchell17 Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016 Location: US Posts: 1,213	I get about 24-27 rising as RPMs climb at WOT. With the stock tune with the stock E85 adjustment tables its a couple degrees lower than that. I've tried to read research papers on the topic on proper timing for alcohol and haven't really got a good answer. Basically sometimes it requires more and sometimes less. GM seems to think the same way based on their alcohol adder table. But if you actually look at a flex fuel truck engine tunes, its all over the place, but the flex fuel adder for the trucks is about adding 5-10 degrees at WOT but actually pulling 4 or 5 degrees at low load.

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