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      10-14-2019, 10:33 AM   #1
tony77298
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BM3 E30 Tune Fuel Cuts

Hello all! I am curious if anyone else is having this issue, I run the stage 2 E30 tune on my 340I 18 - ap intake, bm3 tune, ER catless downpipe, OEM exhaust, X-delete.

I notice on occasion under WOT pulls if I get close to redline probably around 6k the vehicle will cut power and start horrendously backfiring which I can confirm shoots flames out of my exhaust lol, this does not happen every pull though.

Obviously with that not being good I did contact BM3, they want a few logs however I was curious if anyone else has experienced this, I feel it is the vehicle reaching its fueling limit however I don't know if it could be something else. I also plan on changing my plugs and gaping them to .022 this week, maybe that will help with the issue however I feel it does have to do with fueling.

Any insight would be great!

Thanks !
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      10-14-2019, 06:08 PM   #2
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I get it too, try to get it as close to e30 as possible. If I fill up more than e35 I get em.
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      10-14-2019, 09:33 PM   #3
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https://f30.bimmerpost.com/forums/sh....php?t=1654085
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      10-15-2019, 07:55 AM   #4
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Post up your logs.

What's your E85 actual ethanol content? And what are you using to calculate the mix? I target e33-e34 and never get fuel cuts.
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      10-15-2019, 08:56 AM   #5
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E20-E21 is runs perfectly on the Stage 2 93 tune.

No I don't have logs, but I have no fuel cuts.
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      10-15-2019, 10:26 AM   #6
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Quote:
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E20-E21 is runs perfectly on the Stage 2 93 tune.

No I don't have logs, but I have no fuel cuts.
Same for me. But on the E30 tune, that will cause timing issues. Have to run at least E30.
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      10-15-2019, 11:12 AM   #7
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On MP's flash, I was running out of fuel with only 2 gallons of E85. I'd image on E30, you're well on your way to being limited in fuel. I can say however, that since my modified-G20 HPFP, I can run upwards of 5 gallons of E without that "wavy" acceleration feel and fuel cut.

Last edited by eksigned; 10-15-2019 at 11:39 AM..
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      10-15-2019, 12:03 PM   #8
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Quote:
Originally Posted by kern417 View Post
Quote:
Originally Posted by j1980mac View Post
E20-E21 is runs perfectly on the Stage 2 93 tune.

No I don't have logs, but I have no fuel cuts.
Same for me. But on the E30 tune, that will cause timing issues. Have to run at least E30.
Totally
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      10-15-2019, 12:56 PM   #9
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Quote:
Originally Posted by eksigned View Post
On MP's flash, I was running out of fuel with only 2 gallons of E85. I'd image on E30, you're well on your way to being limited in fuel. I can say however, that since my modified-G20 HPFP, I can run upwards of 5 gallons of E without that "wavy" acceleration feel and fuel cut.
Again, something must be wrong with OP's mix or some other hardware issue. I'm running over 4.5 gallons of E85 (measured E82) with no fuel cuts or issues. 2 gallons barely gets you to E20. Definitely not safe for an E30 tune.

I actually track my fillups to make sure it's the right amount. We're supposed to have 15.8 gallon tanks. However when I go into the hidden menu and calculate how much fuel is left, topping off ends up being closer to 15.1-15.5 gallons. That can play a difference as well if you're already aiming for E35+ with your calculator. But even when I've rounded up and ended up at E34, i was fine.
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      10-15-2019, 01:45 PM   #10
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Quote:
Originally Posted by kern417 View Post
Again, something must be wrong with OP's mix or some other hardware issue. I'm running over 4.5 gallons of E85 (measured E82) with no fuel cuts or issues. 2 gallons barely gets you to E20. Definitely not safe for an E30 tune.

I actually track my fillups to make sure it's the right amount. We're supposed to have 15.8 gallon tanks. However, when I go into the hidden menu and calculate how much fuel is left, topping off ends up being closer to 15.1-15.5 gallons. That can play a difference as well if you're already aiming for E35+ with your calculator. But even when I've rounded up and ended up at E34, i was fine.
I have the same experience as Kern. I was running E30 Stg 2 for a while and my E content would go up to E35-36 sometimes and I never had fuel cut issues until the weather turned cold. Now, if I run the E30 map and its cold outside (especially at night), it will hit fuel cut. That shouldn't be an issue now that I have the Fuel-It CPI kit.
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      10-15-2019, 08:44 PM   #11
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Quote:
Originally Posted by eksigned View Post
On MP's flash, I was running out of fuel with only 2 gallons of E85. I'd image on E30, you're well on your way to being limited in fuel. I can say however, that since my modified-G20 HPFP, I can run upwards of 5 gallons of E without that "wavy" acceleration feel and fuel cut.
Boost is different on the tunes, BM3 runs more timing and less boost. So more boost = more fuel = less E you can run
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      10-17-2019, 05:03 PM   #12
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Cant help without a log. How are you mixing the fuel?
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      10-17-2019, 07:50 PM   #13
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Originally Posted by mike@x-ph.com View Post
Cant help without a log. How are you mixing the fuel?
This entire thread is useless without logs.
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      10-18-2019, 07:12 AM   #14
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Quote:
Originally Posted by G.Newt View Post
This entire thread is useless without logs.
PTF asked for logs, I asked for logs, Mike asked for logs, but instead he'd rather just start a thread so everyone can shoot in the dark and he's been online since, but not giving an update.

Anytime I flash, i run logs to make sure everything's right. Then, if I have an issue, I can run new logs to compare. It seems like a lot of BM3 users don't use the feature until an issue pops up. And, even then, it's hard to get them to do it.
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      10-18-2019, 11:27 AM   #15
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Quote:
Originally Posted by kern417 View Post
PTF asked for logs, I asked for logs, Mike asked for logs, but instead he'd rather just start a thread so everyone can shoot in the dark and he's been online since, but not giving an update.

Anytime I flash, i run logs to make sure everything's right. Then, if I have an issue, I can run new logs to compare. It seems like a lot of BM3 users don't use the feature until an issue pops up. And, even then, it's hard to get them to do it.
Considering that thread was open 4 days ago and OP has not commented since, im assuming issue got resolved. People tend not to post when things go well
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      10-18-2019, 12:43 PM   #16
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My apologies for the lack of responses! Was out of town, spoke with PTF. The cut was due to improper mixture of E30. Everything was running fine except for occasionally on hard pulls it would cut fuel and freak out.

I took the mixture down by half a gallon and since then it has not been acting up ! I also plan on replacing the plugs here soon however it was good to know it was not directly related to that.

Ill also add I ended up testing the ratio which is oddly a pain in rear to do, I was running around e35 with my setup which would explain so. I also checked my local car scene to see if someone has done a test on my local speedway E85, I saw an average of 81% on Ethanol content.

With the tank being 15.8 gallons for anyone wondering I do 5 gallons of e85 and the rest 93, comes out to around E32. I could do a bit less however I would rather overshoot E30 then undershoot it for the tune. Apparently just don't over do it lol
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