Advice on creating an E85 FI Tune with Openflash

[Illuminaughty]

Originally Posted by customfab87

Interesting Thread. Any updates in your E85 pursuit?

I know you PM'd me already but I feel like I should update the thread too for anyone else looking. I've been running a modified version of one of Shiv's tunes for the SBD Turbo kit on E85 for two weeks now with no issues or knock. I've got more testing and logging to do but if anyone has specific questions I'd be happy to answer. Also I'm running stock injectors and not showing signs of fuel cuts (yet), and would wager I'm somewhere around ~250whp (7psi). Since I'm not knocking at all (most I've seen is ~1 degree of FLKC) I believe I have a lot of headroom to push the timing, but I see no point in that until I'm on a dyno and can properly assess how well it's doing in the power department. Big thanks to Shiv too.

[bee_are_zee]

I have been slowly getting ready to give this a try on my vortech at 9 psi and then eventually 11 psi. My plan was to pull timing back modify the fuel to the 30% increase and then work the timing back in. Any suggestions of other parts of the tune you modified? BTW I am running a 270 lph pump and about to install FIC 540cc injectors.

[steve99]

Originally Posted by bee_are_zee

I have been slowly getting ready to give this a try on my vortech at 9 psi and then eventually 11 psi. My plan was to pull timing back modify the fuel to the 30% increase and then work the timing back in. Any suggestions of other parts of the tune you modified? BTW I am running a 270 lph pump and about to install FIC 540cc injectors.

you will need to increase the Cranking Injector Pulse widths their is a set of about 6 tables, you should just be able to copy them from an NA E85 tune, unless you have changed injectors, pretty sure it only uses port injectors on startup.

[bee_are_zee]

Originally Posted by steve99

you will need to increase the Cranking Injector Pulse widths their is a set of about 6 tables, you should just be able to copy them from an NA E85 tune, unless you have changed injectors, pretty sure it only uses port injectors on startup.

Thanks for the tip. I don't currently, but I will shortly. I basically am dissecting the na e85 tune and the ecs e85 tune.

[steve99]

Originally Posted by bee_are_zee

Thanks for the tip. I don't currently, but I will shortly. I basically am dissecting the na e85 tune and the ecs e85 tune.

Once you change port injectors for higher flow ones then you migh get all the fuel you need at startup as those cranking ipw tables look like raw pulse widths, but probably best to talk to @ztan on that or someone who has upped port injector sizes

[customfab87]

Originally Posted by steve99

you will need to increase the Cranking Injector Pulse widths their is a set of about 6 tables, you should just be able to copy them from an NA E85 tune, unless you have changed injectors, pretty sure it only uses port injectors on startup.

I just changed Cranking Fuel IPW Compensation A (RPM) instead of dealing with the 6 tables. This chart corrects cranking fuel based on coolant temperature. Car has started on the first try down to 50 degrees.

[steve99]

Originally Posted by customfab87

I just changed Cranking Fuel IPW Compensation A (RPM) instead of dealing with the 6 tables. This chart corrects cranking fuel based on coolant temperature. Car has started on the first try down to 50 degrees.

Yes that should work as well, in my rom their are actually 10 cranking ipw tables.

did you rescale temp axis on the cranking fuel ipw VS coolant table ?

[Wayno]

You don't tune E85 like you do petrol. If all you're doing is creating a tune so that you can drive to the dyno with E85 in the tank that's fine. But don't expect that you can adjust timing on the street and hit MBT.

[bee_are_zee]

Originally Posted by Wayno

You don't tune E85 like you do petrol. If all you're doing is creating a tune so that you can drive to the dyno with E85 in the tank that's fine. But don't expect that you can adjust timing on the street and hit MBT.

Correct. Are you saying my butt dyno isn't calibrated and an effective method of measurement?

[SteveIsBored]

Originally Posted by Illuminaughty

I know you PM'd me already but I feel like I should update the thread too for anyone else looking. I've been running a modified version of one of Shiv's tunes for the SBD Turbo kit on E85 for two weeks now with no issues or knock. I've got more testing and logging to do but if anyone has specific questions I'd be happy to answer. Also I'm running stock injectors and not showing signs of fuel cuts (yet), and would wager I'm somewhere around ~250whp (7psi). Since I'm not knocking at all (most I've seen is ~1 degree of FLKC) I believe I have a lot of headroom to push the timing, but I see no point in that until I'm on a dyno and can properly assess how well it's doing in the power department. Big thanks to Shiv too.

Would u mind sharing screen shots of changes made or possible send me a copy.

[steve99]

Originally Posted by Illuminaughty

I know you PM'd me already but I feel like I should update the thread too for anyone else looking. I've been running a modified version of one of Shiv's tunes for the SBD Turbo kit on E85 for two weeks now with no issues or knock. I've got more testing and logging to do but if anyone has specific questions I'd be happy to answer. Also I'm running stock injectors and not showing signs of fuel cuts (yet), and would wager I'm somewhere around ~250whp (7psi). Since I'm not knocking at all (most I've seen is ~1 degree of FLKC) I believe I have a lot of headroom to push the timing, but I see no point in that until I'm on a dyno and can properly assess how well it's doing in the power department. Big thanks to Shiv too.

Have you seen this by moto-mike
http://www.ft86club.com/forums/showp...2&postcount=17

[Illuminaughty]

Originally Posted by Wayno

You don't tune E85 like you do petrol. If all you're doing is creating a tune so that you can drive to the dyno with E85 in the tank that's fine. But don't expect that you can adjust timing on the street and hit MBT.

I think you're completely right. The only way (in my opinion) to get the MBT right is on a dyno where you have a controlled environment and you can make incremental timing tweaks while measuring your power. What I've got now is a tune that's giving me decent power, is very drivable, and isn't knocking at all (so i'd presume it's safe). After a few days of logging the most I've seen is 1 degree FLKC in the mid 3000 RPM range. I've got to get on a dyno to see what power I can squeeze out of these stock injectors

[Illuminaughty]

Originally Posted by steve99

Have you seen this by moto-mike
http://www.ft86club.com/forums/showp...2&postcount=17

I did actually, I scoured the forums before undertaking this, but thanks for pointing it out either way . That whole PI/DI thread was really helpful. I hope I can dig myself further into this stuff and contribute back like you, kodename, ztan, shiv, moto-mike, ect all do.

[ztan]

Originally Posted by Wayno

You don't tune E85 like you do petrol. If all you're doing is creating a tune so that you can drive to the dyno with E85 in the tank that's fine. But don't expect that you can adjust timing on the street and hit MBT.

^^^ What Wayno said. E85 is not knock limited like petrol so you can go right past MBT and not know it on the road unless you have somewhere to do repeatable pulls.

Will be interested to see where you are up to at the moment. Still at 9psi?