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      05-25-2018, 09:22 AM   #1
bryan_G01
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Track Day - We need to fix this fuel issue

Hey everyone,

So another track day in the books, and yet another day where i hit a drive train malfunction. This time it was with a little more fuel than 1/4 tank.

It's really starting to piss me off. Has anyone figured out a remedy, or is the fix to fill up the tank before each session?


Is this issue only with ppl using upgraded lpfp?
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      05-25-2018, 10:02 AM   #2
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A fuel pump on each side of the saddle tank is the solution for E36s and E46s. Do these cars have saddle tanks with a single pump, and the car starves for fuel only on right-hand (or left-hand) turns? If so, I wonder if a dual fuel pump setup is an F2x solution, too.
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      05-25-2018, 11:49 AM   #3
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Quote:
Originally Posted by bryan_f22 View Post
Hey everyone,

So another track day in the books, and yet another day where i hit a drive train malfunction. This time it was with a little more fuel than 1/4 tank.

It's really starting to piss me off. Has anyone figured out a remedy, or is the fix to fill up the tank before each session?


Is this issue only with ppl using upgraded lpfp?
I just ran a track day and didn't have any issues. Fuel light actually came on for one session and I did a few more laps and was ok.

Last year my light came on with 7-8 laps. I kept going while watching my miles to empty. It was at 7 miles to empty when I finished which seems really low. I had no issues that day either. I am on the stock fuel pump.
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      05-25-2018, 02:08 PM   #4
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Quote:
Originally Posted by jmwilson125 View Post
I just ran a track day and didn't have any issues. Fuel light actually came on for one session and I did a few more laps and was ok.
On which track and in which direction were you running?

Last edited by dradernh; 05-25-2018 at 02:18 PM..
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      05-25-2018, 03:38 PM   #5
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I dream of a bigger fuel tank, so would love to hear if there might be a way to fit something larger in there. Doesn't seem like a lot of room though (and I try not to dwell on the potential what-if's of a gas tank that straddles the driveshaft/diff).
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      05-25-2018, 04:21 PM   #6
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Quote:
Originally Posted by dradernh View Post
On which track and in which direction were you running?
Forgive my ignorance, but I've only ever seen that track run in one direction. Is it common to run a track in reverse?

And it was Cannan speedway, In Cannan NH. It's the only track I've ever been to. To me it seems slower twistier track. Max speed for the day was around 92 mph.
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      05-25-2018, 04:27 PM   #7
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Quote:
Originally Posted by Maynard View Post
I dream of a bigger fuel tank, so would love to hear if there might be a way to fit something larger in there.
The base Cayman can be optioned with a 16.9-gallon tank in place of the standard 14.2-gallon tank. Wouldn't it be nice if BMW had seen fit to offer something along those lines - assuming a larger tank would fit, of course.
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      05-25-2018, 04:45 PM   #8
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Quote:
Originally Posted by jmwilson125 View Post
Forgive my ignorance, but I've only ever seen that track run in one direction. Is it common to run a track in reverse?

And it was Cannan speedway, In Cannan NH. It's the only track I've ever been to. To me it seems slower twistier track. Max speed for the day was around 92 mph.
Canaan Motor Club - got it. The reason I asked the direction is that I'm wondering if the fuel starvation problem is the common one, where starvation occurs only in right-hand turns, or only in left-hand turns, depending upon the car model.

When you hear a driver refer to running a track n.n CCW, he's telling you that he ran the track counter-clockwise in its n.n-mile configuration. Alternatively, he may have run it n.n CW, or n.n miles clockwise. The distance is included because some tracks have multiple configurations resulting in differing distances for the laps being run during a given event.

Some examples: Palmer Motorsports Park is a single-length track in Palmer, MA that is run in both directions, which is fairly interesting given how technical that track is; Pocono Raceway, which I haven't driven, has (I've gathered) a multiplicity of configurations, some or all of which are run both CCW and CW; and, the direction is frequently mentioned when sharing event experiences for one of the popular SoCal tracks (can't remember the name), so they apparently run that track's configuration(s) both ways, too. It says here that Canaan itself was designed to be run in both directions: http://www.canaanmotorclub.com/the-track/

If you're wondering why courses are run both ways, the event sponsors are doing what they feel they have to do to keep drivers interested and attending their events. It's my guess that when running in the opposite direction is first proposed, it's by event sponsors; of course, track owners must agree, as they're in overall control of the event. Palmer, which opened in 2015, didn't start out with events running both ways; COM may have been the first club running Palmer clockwise, and they didn't run it CW until June of last year. COM is a hard-core TT club, and it's entirely possible that the members asked the club officers to ask the track owner if they could run it CW.

Last edited by dradernh; 05-25-2018 at 05:02 PM..
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      05-26-2018, 09:59 AM   #9
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My issue happens all the time at lime rock, coming under the bridge on the downhill, about 90 - 95 mph, quick lift to plant suspension, than steer toward apex, flat out on the straight.

As i hammer down for the straight, it starts to hiccup (not misfire) if i lift, i can keep the car from going full out CEL, If i continue with gas mashed down, it will 100% throw the code.

This usually only happens with 1/4 or little more left in tank. Im running stage 2 lpfp.


Can see it happen here with 10 seconds left ( on my fastest lap ever, so pissed would have been a few tenths quicker)

https://www.facebook.com/bryanduncan...2585834664262/
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      05-26-2018, 10:35 AM   #10
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I'd call Bimmerworld; if they can't help, they might know who can.
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      05-27-2018, 06:35 PM   #11
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I've ran clockwise with about 1/8 tank without issue. Honestly I consider anything around 3/8 of tank pretty good for a production car such as ours.

I do remember seeing that Fuel-it had a solution to this for BMWs that involved multiple pick up points in the tank, but I can't seem to find it now. Maybe I only saw them mention it on n54tech.

I've had two cars with this issue that were very severe. My EvoX had this with CCW tracks and I would easily get fuel cut at just over 3/4 of tank at Auto Club Speedway.

My 370Z was just as bad as the EvoX and I had to go with this soluion:
https://www.z1motorsports.com/fuel-s...p-p-10002.html

It was a huge pain in the ass to install though.
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      05-27-2018, 08:23 PM   #12
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yea, about to go back to a stock fuel pump i think...

was cool when was thinking BIG POWER, now its all about laptimes. And throwing a drivetrain malf and sounding like a tractor till you get to restart the car isnt cool.
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      05-28-2018, 12:30 AM   #13
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Could you try and adapt something like a Holley Hydramat to your aftermarket pump?

Similar to what Fuel it is now doing with their bucketless set ups.
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      05-28-2018, 01:02 PM   #14
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I've run surge tanks in my drag cars, for this same reason.

In this car, I got the fuel starvation/ drivetrain malfunction when on hard left turns, mostly. And was under 1/2 tank, somewhere around 3/8 tank. Simple fix is to always keep it above half, but shouldn't be that way. Some tracks don't offer fuel, on site, and some don't have fuel nearby, either. Can be frustrating.

Anyone see fuel anti-surge tank offerings for BMWs? I don't even hear that language around these parts, lol
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      05-31-2018, 08:14 AM   #15
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not to mention fuel at the track is crazy expensive.

This is a stop gap for HPDE's, but how is the m235 Motorsport car dealing with this?

Probably dosen't have an issue since its only 300whp and stock pump.
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      05-31-2018, 09:49 AM   #16
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Quote:
Originally Posted by bryan_f22 View Post
but how is the m235 Motorsport car dealing with this?
Race car = fuel cell

It's mentioned in passing on Turner's page listing the M235iR kit parts they sell: https://www.turnermotorsport.com/p-3...AQEBAQEBAQEBAQ
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      06-01-2018, 07:55 AM   #17
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Quote:
Originally Posted by dradernh View Post
Race car = fuel cell

It's mentioned in passing on Turner's page listing the M235iR kit parts they sell: https://www.turnermotorsport.com/p-3...AQEBAQEBAQEBAQ
thought about fuel cell.... not worth the hassle.
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      06-16-2018, 05:14 PM   #18
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Fully submerged in line pump & surge tank would solve this, for sure, just don't know if it's something anyone has done around here? Would defeat the purpose of an in tank LPFP upgrade, though. The VAG guys use these in line pumps in conjunction with the OEM FI in-tank pumps, to get the fueling they require for 400-600whp setups. Not even sure this would be compatible with a DI setup, but worth the conversation, I think?


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