timing with e85
 

how much more timing r u guys running on e85 than gas lets say up between 15-25psi,

also compared to race gas like c16 do u run same or less timing

thnx

21 psi 12 degrees. was only testing.

I am also interested in this....

My engine is high compression(10:1) and I am running around 20psi of boost on e85 too.

Thanks.

Chris

we r running 15* @ 20 psi,

will try some more next time

Oh I see. I am running about 8Deg advance at 20psi across the board with a split of 8 falling to 6 towards the top end.

My engine is high compression though(10:1).

Thanks for the info....anyone else?

Chris

Brought the thread back from the dead.
Dynoing my car most likely on Wed.
Right now running .76 - .78 lambada(11.3-11.5 gas AFR)
25psi boost falling to 23psi above 7k (out of turbo)
12* 0 split at 25psi
13.5* 0 split at 23psi
15* 0 split at 20psi
EGT's are 1450-1500f steady

Should I bother to tune leaner or add more timing? Or am I pressing my luck as is.

I have an hour avail on the dyno this session.

How's your knock logs look like? Hell, if they're good... raise the boost a bit* (~27psi) ;)

Any updates?

would like to know how the timing advance compares to c16.

and how much cooler your engine temps are with E85.

is e85 decent to run on a n/a. Or am I being crazy?

with e85. I generally run 2-3 degrees more timing then normal pump fuel.

On e85 you can run around 5-6 degree advance at around 30psi no worries with a 8 degree split.

Around 35psi run around 3-4 degree advance with 8 degree split.

Once you start getting close to 40psi start to get some knock with even 0 degrees advance.(you can use water to get rid of the knock, we have done that on a customer car).

25psi run around 9 degrees advance with 8 degree split

20psi run around 11 degrees advance with 8 degree split.


Just remember guys. If the engine is built right, it will not a huge amount of advance to make bulk power. Only engines with crappy porting will need lots of timing to make ok power.

THANKS 72c,, good info, YUP,, somethin to think about !!

I made this little chart for my E6K.

Is this on a 13b or 20b and is it ported

13B halfbridge

Do you think the timing would change alot more, if it was pure methanol?

I would think you could add much more timing with pure meth. Takes a lot to get that stuff to detonate.