E85 Timing Map

[yezzir]

OK, back on track and have a much better understanding of tuning the VE (MANUALLY) and the transitions with the ignition timing... Ran the 93 octane out till I had to putter the car home, dumped in the E85 and went tuning with my new found knowledge (thanks to input from Stinger, Wilson and reading).

I upped my required fuel to reach a E85 AFR of 9.7 and spent the 1st 30 minutes using VE analyzer to tune the tables. I ended up just adding 25% across the VE table, especially from 100KPA on up and it was much easier driving and tuning that way. Now I'm into tuning the boost areas and the higher, no load RPM areas.

This is the ignition table I'm using, which I simply added a few points to the 93 octane ign table tune.

Does anyone have a tired and true ign table that I can tailor for my build or any suggestion on the table I'm using? Your input is greatly appreciated!

The VE still needs work, but I haven't hit all the areas as mentioned above. Last datalog and tables are included...

Thanks

[Stinger]

You shouldn't need to add any significant amount of fuel to the VE table after changing the required fuel value (which adds the 30% more fuel required for E85 for you). If you changed required fuel for E85 and added 25% more fuel in the table, you've actually added 55% more fuel than on pump gas (which is way too much).

Short of putting your car on a dyno and tuning the timing table, there is nobody that can provide you a timing table that will be any better than what you already did (just add a few degrees to a pump gas table).

[yezzir]

I was expecting it to add.the additional fuel but it didn't, so I opted to add it after comparing it to my 93 octane map. I added a few points to the timing table and she responded well. I'm going to leave it there and gradually up the boost!

[Stinger]

It doesn't add it to the fuel table (make the ve numbers larger), it changes the required fuel calculation which changes commanded fuel.

In other words, a car running gas, e85, and methanol would all use the same fuel/ve table numbers as long as the required fuel setting is changed for each fuel.

[yezzir]

May 26, 2012 17:48:54 GMT -5 Stinger said:

It doesn't add it to the fuel table (make the ve numbers larger), it changes the required fuel calculation which changes commanded fuel.

In other words, a car running gas, e85, and methanol would all use the same fuel/ve table numbers as long as the required fuel setting is changed for each fuel.

I agree with you in principle Stinger. I went from a required fuel of 3.9 to 5.8 based on the AFR target of 9.7 vs 14.7. My VE table did NOT compensate or make the translation, as it sputtered badly and was SUPER lean. Now my VE numbers are considerably higher across the board, based on the required fuel of the E85.

[svslow]

Seems to me like something else isn't set right if that's the case. When I switched over to E85 all I did was change the Req Fuel and it was good to go.

[yezzir]

Thats what I expected... Can you peak at my msq to see if you find a problem in there?

[Stinger]

I agree. If yours required more than minor VE tuning after the switch, something else is wrong.