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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Bootmod3 for N20 questions
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      08-18-2020, 10:05 AM   #67
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Two week update:
Changed the factory spark plugs that had 38k on them. Even smoother power delivery. My average MPG dropped from about 28.5 to 24.0. But did I mention how much MORE POWER there is? Well worth the trade-off. Easily the best $600 mod I've ever done to a car. Next up is to squat it a little with some ACS springs and B6s.
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      09-07-2020, 09:57 PM   #68
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n20 stage 2 bootmod3

Looking for some feedback on going stage 2?

Thoughts?
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      09-11-2020, 06:42 PM   #69
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I was driving this weekend in 120F (about 50 degree Celsius) degree weather. Pretty crazy hot. I was running ACN 91 gasoline on my ACN 91 stage 1 tune for N20.

I get drive train malfunction every time at redline when it shifts from 5th to 6th gear (speed is about 120mph). This only happens at redline in 5th. Never happens in lower gears. If I shift before redline, no malfunction. I check for codes and I have none. The car runs fine as well after drivetrain malfunction - no reduced power. A restart will clear the malfunction.

Anyone know what is going on? Is it too much heat and too much load for the tune?
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      09-15-2020, 09:02 AM   #70
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Quote:
Originally Posted by Z K View Post
I was driving this weekend in 120F (about 50 degree Celsius) degree weather. Pretty crazy hot. I was running ACN 91 gasoline on my ACN 91 stage 1 tune for N20.

I get drive train malfunction every time at redline when it shifts from 5th to 6th gear (speed is about 120mph). This only happens at redline in 5th. Never happens in lower gears. If I shift before redline, no malfunction. I check for codes and I have none. The car runs fine as well after drivetrain malfunction - no reduced power. A restart will clear the malfunction.

Anyone know what is going on? Is it too much heat and too much load for the tune?
Could be exceeding torque rating for those gears at those miles per hour. I am not positive, though.
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      09-19-2020, 12:25 AM   #71
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Quote:
Originally Posted by 5mall5nail5 View Post
Could be exceeding torque rating for those gears at those miles per hour. I am not positive, though.

I got a drivetrain malfunction again today. This time it was not hot outside. Same, only happened at redline when automatic shifting to the next gear. I can shift manually before redline and it will not have malfunction. It reset itself after turning the car off.

I used bootmod3 to read the codes, and it gave me a "120308 boost pressure too low" as the only code
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Last edited by Z K; 09-20-2020 at 01:23 AM..
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      09-23-2020, 03:48 PM   #72
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Quote:
Originally Posted by Z K View Post
I got a drivetrain malfunction again today. This time it was not hot outside. Same, only happened at redline when automatic shifting to the next gear. I can shift manually before redline and it will not have malfunction. It reset itself after turning the car off.

I used bootmod3 to read the codes, and it gave me a "120308 boost pressure too low" as the only code
I was able to speak to bootmod3 OTS map support and they were able to fix the issue for me after I explained the problem. Flashed, logged a run and all set. Fast turnaround and good experience. Logging a full 5th gear pull was a bit difficult but I was able to get it in.

They reduced the boost pressure and ignition timing at high rpm and everything is running smooth now. Looks like the OTS ACN 91 map is a little aggressive for the conditions we have in California.
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      10-22-2020, 06:04 PM   #73
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Quote:
Originally Posted by Z K View Post
I was able to speak to bootmod3 OTS map support and they were able to fix the issue for me after I explained the problem. Flashed, logged a run and all set. Fast turnaround and good experience. Logging a full 5th gear pull was a bit difficult but I was able to get it in.

They reduced the boost pressure and ignition timing at high rpm and everything is running smooth now. Looks like the OTS ACN 91 map is a little aggressive for the conditions we have in California.
It has been a few weeks since my final update from BM3 support. I went through 4 test files and lots of logging with BM3 support. It looks like ACN 91 fuel is pretty bad.

The final tune after all the logs and tests feels a lot like stock. He said this is as much as can be safe for the car based on California's 91 octane fuel. Even stock tune will pull timing on ACN 91 fuel...

Pretty disappointed that BM3 couldn't unlock much power safely due to the bad fuel here. The current "safe" power output is way down compared to the OTS ACN 91 map.
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Last edited by Z K; 10-22-2020 at 06:09 PM..
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