fuse

Is there a rule of thumb when using e-85 in ignition timing maps.

Lets say you have a stock b16a and you tune fuel. Should you mess with ignition timing? I have searched and read you add ignition timing. On average how much more ignition timing do your all run compared to a stock ignition map?

Chris Harris

You are only going to be able to tell if the car is making more power with the extra ignition timing if you are on a dyno, have a G-Meter (accelerometer), or can do consistant back to back runs on the track to see any changes in trap speeds.

You will def be able to add more timing without pinging using E-85, but will it help is the question.

fuse

K will leaving ignition stock be ok? Till I get a G meter or dyno time.

Chris Harris

It will be safe with E85, yeah

fuse

K thanks.

sewell94

typically with 116 you can run 5 degrees on top of your pump gas maps and that will give you a good starting point.


The last e85 tune i did, ended up having 4.5 degrees more timing over the pump gas map. This was on a bone stock boosted b16.

fuse

Nice any one else want to chime in. I am just wondering how hard your can push e85 ignitions.

cb1000rider

I haven't found that I can push ignition a lot harder than I can running 93 octane, maybe a few points of ignition total. Generally I've found retuning ignition for occassional use not worth it... IF you're NA, forget about E85.

undesiredshoe

Im running e85 in my stock block ka24e 240sx. 13 psi from a t3/t4 and im currently running about 1* retard per psi which i think is on the safe side. From reading around, i found that e85 should be run at the same timing as gasoline.