Official OpenFlash Tablet FA20 Tuning Tech Discussion Thread

[Indestruct]

Originally Posted by jsimon7777

FYI, getting cold start issues with E85 tunes, both the last version and current b version. Car takes at least two tries to start when the temp is below 60 degrees. Perhaps the Propel fuel has too much ethanol?

And just a friendly reminder to all of you who are considering tuning your car: DO IT! And do e85 if you can. My goodness...

I think we're using the same propel fuel, mine's from Oakland... Having the same problems as you are. I downloaded Romraider and am thinking of increasing the pulse cranking...

[Sterling Doc]

Originally Posted by Indestruct

I think we're using the same propel fuel, mine's from Oakland... Having the same problems as you are. I downloaded Romraider and am thinking of increasing the pulse cranking...

This has to be a fuel blending issue, as him having very little trouble with "E85" starts down to 0° here in the Midwest. The fuel trims all still look pretty good. AFR's are a bit rich at high RPM, which may indicate a slightly higher gasoline content. Runs great, and pulls very strong at these cold temperatures.

[EAGLE5]

Originally Posted by Indestruct

I think we're using the same propel fuel, mine's from Oakland... Having the same problems as you are. I downloaded Romraider and am thinking of increasing the pulse cranking...

I'm going to fill tonight but put $5 of 91 in first. A pain in the butt, but it will let me know if the fuel is the problem. I can live with a little blending to get the e85 advantages. Propel is labeled down to e70 but I don't know if there are any top limits on the ethanol content.

[Shiv@Openflash]

I primarily use the E85 pump at the Sunol super stations (Andrade exit) and the station right off of the A street exist on 880 (in Hayward). Neither are Propel brands and both work well when it comes to cold start. Don't have a especially hard time starting even when temps are down to 30F. Maybe a little sputter for a first few seconds. But it never requires more than 2 starting attempts. And I have measured ethanol content as high as 85%. Perhaps Propel is now pumping higher than that?

[WRB5titch]

AFAIK, We only get propel down here in OC area and I have to dilute with 1 to 2 gallons of 91 to start nicely in the morning. Even with the revised cranking tables in 1.42b, if I ran straight e85 it would take 3-5 cranks to start up, car's LTFT would shoot up to 8% during WOT as well.

Tossed in 2 gallons of 91 and car started up fine. LTFT also went back to normal ~.75

[steve99]

Originally Posted by shiv@vishnu

. Feel free to email sales@vishnutuning.com if you have any questions about the OFT

Cheers,
shiv

Hi Shiv,
noticed in the RomRaider Defs thread that Td-d has posted up the RAM addresses for IAM logging for G series ROM's, any idea when when this may be incorporated into OFT so we can log IAM

Thanks

[Indestruct]

Originally Posted by jsimon7777

I'm going to fill tonight but put $5 of 91 in first. A pain in the butt, but it will let me know if the fuel is the problem. I can live with a little blending to get the e85 advantages. Propel is labeled down to e70 but I don't know if there are any top limits on the ethanol content.

All I know is that my first tank w/91 and E85 I had 0 problems. Now when i'm on full e85 and zero 91, I'm getting issues. Also other people reported that blending some 91 makes the car start easier... Please report back.

[EAGLE5]

Originally Posted by Indestruct

All I know is that my first tank w/91 and E85 I had 0 problems. Now when i'm on full e85 and zero 91, I'm getting issues. Also other people reported that blending some 91 makes the car start easier... Please report back.

I'll start the car later today and post my findings. I blended in about 1.3 gallons last night (5 bucks exactly!) with a tank of e85. Yeah, my first tank went beautifully. Second and third tank had hard starting.

[Terrapin77]

I have a question about E85 and fuel trims. I'm on my third tank of E85. The 1st two tanks my trims were consistently +/- 3. My current tank the trims are +/- 15. I did buy my current tank at a different station. But considering all stations in Atlanta guarantee at least E70, why would the trims go crazy? I did recently flash a new map, however the only difference from the previous one was a change in the cranking tables. Would this affect the fuels trims?

Sent from my XT912 using Tapatalk

[Shiv@Openflash]

Originally Posted by Terrapin77

I have a question about E85 and fuel trims. I'm on my third tank of E85. The 1st two tanks my trims were consistently +/- 3. My current tank the trims are +/- 15. I did buy my current tank at a different station. But considering all stations in Atlanta guarantee at least E70, why would the trims go crazy? I did recently flash a new map, however the only difference from the previous one was a change in the cranking tables. Would this affect the fuels trims?

Sent from my XT912 using Tapatalk

Everytime you flash a new file into the ECU, it takes at least 50-75 miles of driving before LTFTs settle to where they are stable. If it has been less than that, that would account for the noise you are seeing. If you have that many learning miles on the car, then next step would be posting up you logs (datazap.me) and letting us see

[EAGLE5]

Originally Posted by Terrapin77

I have a question about E85 and fuel trims. I'm on my third tank of E85. The 1st two tanks my trims were consistently +/- 3. My current tank the trims are +/- 15. I did buy my current tank at a different station. But considering all stations in Atlanta guarantee at least E70, why would the trims go crazy? I did recently flash a new map, however the only difference from the previous one was a change in the cranking tables. Would this affect the fuels trims?

Sent from my XT912 using Tapatalk

Sounds like different gas.

[Terrapin77]

Originally Posted by shiv@vishnu

Everytime you flash a new file into the ECU, it takes at least 50-75 miles of driving before LTFTs settle to where they are stable. If it has been less than that, that would account for the noise you are seeing. If you have that many learning miles on the car, then next step would be posting up you logs (datazap.me) and letting us see

It's only been 25 miles since the flash. If my trims don't clear up in the next 50 miles, I will try to get good data log, which is hard to do in the constant traffic in Atlanta considering a 3rd gear WOT pull puts you at around 90 mph. I don't need anymore tickets.

[solidONE]

I've been back on 91 pump gas for a while now, and the crickets that went away when I ran E85 have not come back yet. Not sure if it's the cooler weather, or the E85 effected the squeaky part of the pump in a permanent way causing the crickets to go away for good.

[solidONE]

Here's a recent log I took with Shivs test rom to fix my fuel trim and knocking problem:
http://www.datazap.me/u/solidone/1-1...64-199-129-207

Here's a log before I ran the test rom above when I had modified the MAF scale to fix the fuel trim problem:
http://www.datazap.me/u/solidone/1-1...9148-9143-9113

Couple of things between the 2 roms:

1. Shiv's new test rom has leaned out the target AFR a bit.
2. The MAF scale between the 2 roms were extremely similar when graphed.
3. While the earlier rom had the throttle increase to past 99% from about 96% at 5000rpm or so, shiv's test rom had the throttle taper off from 97% at 3900rpm to 90% at redline.
4. Both roms were pretty resistant to the IAM getting trimmed back from 1, but the rom with my modified MAF was more resistant. I'm assuming because of the richer mixtures across the board.

Curious why the throttle does not open 100%. Which parameter(s) is used to decrease throttle opening?