08-06-2019, 04:48 PM | #45 |
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03-08-2021, 03:32 PM | #46 |
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Drives: M2 M Performance Edition - 6mt
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I want to revive this thread, mainly because I have been experiencing this problem at Sebring in turn 17 (a super fast, long right hander). Unfortunately for me, this resulted in a cracked piston and therefore required a complete engine rebuild. I was running an F80 Paul Johnson custom tune at the time, I thought that was the cause...
The N55-b was completely rebuilt with Carrillo rods and CP pistons and VAC bearings. I also did the crank hub since everything was disassembled anyway. To my surprise, when I went back to Sebring this weekend the car stuttered again coming out of turn 17 for just a second, but kept going. I took it easy for about 1/2 a lap, trying to ignore what just happened but everything seemed fine and by the time I got back to turn 17, obviously there was even less gas in the tank. Then it happened! Full on stutter / drivetrain malfunction. The car was coughing and running super rough. I thought I blew the motor again and freaked. Drove to the pits and started talking to other BMW guys and sure enough somebody said "fuel starvation". I googled it and here we are. Has anyone else has this level of issues? And does the Dinan kit really solve this? I already have the LPFP from Fuel-it installed, and obviously that alone does not solve the issue. |
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03-08-2021, 03:38 PM | #47 | |
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03-08-2021, 03:40 PM | #48 | |
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Before the mod, I’d have fuel starvation issues below 1/2 tank. Now, I can run the tank dry. |
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04-18-2021, 08:45 PM | #49 |
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Yes - I'm also running an XDI-35 HPFP. The entire fuel system is upgraded. I added the Dinan LPFP upgrade kit as well in an attempt to solve the pickup issue. Unfortunately, I still got stutters out of 17 below 1/2 tank. Just have to keep filling up I guess.
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04-18-2021, 09:01 PM | #50 | |
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I'd imagine the bumps aren't helping either. I wonder if an upgraded LPFP would help, or if the design of the M2 gas tank just can't handle high-G + big bumps at the same time? |
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06-02-2021, 04:09 PM | #51 |
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Is this a problem for the M2C as well? My car went into limp mode at the track right after a high speed / high g force right hander. I was pretty high up in the rev range too so I'm guessing it wanted lots of fuel. I'm pretty sure I was at or below half a tank.
Anyway, code was for a misfire. The car was able to drive fine right after I pulled into the pits and restarted the engine. Took it to BMW and they blamed 'mid range fuel' which is not at all what I was running lol. |
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