Fuel Starvation on High G Corners?

[larryn]

Originally Posted by FrenchBoy

I can attest that larryn is quick out there. Nice driving buddy!

Can't wait for you to get the SOABZCP. You're going to have fun. (did I guess your work password?)

[M3 Number 86]

Any fuel hiccup issue sucks! A few times I've just rolled out to the pits during a session because I haven't realized lol

I'll look at average consumption next time in e90. I think I can get to 6 mpg as well lets see.

[M3 Number 86]

Originally Posted by jacobe92

I take it you get on the track every time at minimum fuel to keep the weight down. ?. I do the same thing. My next Trackday will be on May 28 and it will have turns like you describe. I'll report back. This will only be my 2nd Trackday on my new F80. Cheers!

You better be faster than me in the new ride

[CanAutM3]

Originally Posted by M3 Number 86

Any fuel hiccup issue sucks! A few times I've just rolled out to the pits during a session because I haven't realized lol

I'll look at average consumption next time in e90. I think I can get to 6 mpg as well lets see.

The F8X definitely drinks more than the E9X at the track. I could comfortably do 3 session with my E92, something impossible to do with my F82.

Further, the fuel pick-up was pretty well designed on the E9X. I ran sessions down with ---.- written as range without any starvation issues.

[SYT_Shadow]

This is a shame, it's going back to the ridiculous issues the E46M had... E92 had zero issues with this, it's disappointing BMW did not continue down that path regarding fuel

[wkndracr]

Maybe I'm not driving hard enough, but at my first track day with this car, I had no issues with fuel. My last session I started with a hair over 1/4 tank, and decided to pull in when the car was telling me 2 miles to empty, lol. Even running at around 100-105 mph on the left hand banked turn 1 at Pocono, I didn't notice anything odd.

[M3 Number 86]

Originally Posted by CanAutM3

The F8X definitely drinks more than the E9X at the track. I could comfortably do 3 session with my E92, something impossible to do with my F82.

Further, the fuel pick-up was pretty well designed on the E9X. I ran sessions down with ---.- written as range without any starvation issues.

of course because of turbos - it's ironic how it is basically "live with it, we are going into economical technology" but everyone knows you hammer it and live in boost all day fuel goes down the drain quite quick.

that being said, e90s aren't too shabby in the thirst category. I will try to see how low I can get haha.

[YMB_M3]

I've ran the car down on gas to the point where it said "---" on track probably 5 times now just by not noticing and haven't had this issue.

[dawgdog]

I had fuel starvation issues in my e92 at the Ridge, usually after turn 11. Had to keep 3/8 tank to prevent this. Have not really pushed the f80 yet.

[larryn]

Originally Posted by dawgdog

I had fuel starvation issues in my e92 at the Ridge, usually after turn 11. Had to keep 3/8 tank to prevent this. Have not really pushed the f80 yet.

Wow. That's odd. I never had starvation issues in the E92, anywhere. The F82 has issues on turn 9 on track out at the Ridge. In this car, it is a very involving corner, and having the car suddenly bog down there is not too safe.

[M3Tooner]

Apparently the M4 GTS has a modified fuel pump pickup suction strainer to help with ensuring reliable fuel supply under high lateral and longitudinal acceleration forces. Someone should figure out if that suction strainer can be retro fitted on our regular M3/4 fuel pump. This may be all we need to solve the fuel starvation issue discussed here.

M4 GTS complete technical document in the GTS thread here --->M4 GTS Technical Document Link Skip to page 51.

[larryn]

Excelent find!

I spent the last 20 mins or so looking into realoem, as the GTS is now listed there separate from the regular M4. There do not appear to be any differences in part numbers for fuel delivery, fuel tank, control unit, high pressure fuel pump, throttle housing, injectors, etc. Though there are some changes in the charge air induction tracts, which should be unrelated to this...

[M3Tooner]

Originally Posted by larryn

Excelent find!

I spent the last 20 mins or so looking into realoem, as the GTS is now listed there separate from the regular M4. There do not appear to be any differences in part numbers for fuel delivery, fuel tank, control unit, high pressure fuel pump, throttle housing, injectors, etc. Though there are some changes in the charge air induction tracts, which should be unrelated to this...

Maybe this new suction strainer is already in production across the board for regular M3/4's as well, not just for the GTS. I'm saying this because in another post, I also found this same document describing that the GTS engine bedplate is different then the regular S55, but then was quickly informed by a forum member that BMW has since superseded the old block part number with this new stronger bedplate. So now all S55 blocks starting Dec 2015 production will have this freebie upgrade.

[dawgdog]

Originally Posted by larryn

Wow. That's odd. I never had starvation issues in the E92, anywhere. The F82 has issues on turn 9 on track out at the Ridge. In this car, it is a very involving corner, and having the car suddenly bog down there is not too safe.

Larry,
Aaron has had issues there with my erstwhile M3. Not sure why it happened to me after 11. I had it happen 3-4 times until I started filling up more often.

[larryn]

Originally Posted by dawgdog

Larry,
Aaron has had issues there with my erstwhile M3. Not sure why it happened to me after 11. I had it happen 3-4 times until I started filling up more often.

Filling more often is the key. More weight though, more of the time, unfortunately.

Funny thing, the 76 gas station down the street from the Ridge shuts off your card after two fill ups. It happened to me both times I was there this year. You either have to go inside to use the card, or use a different card.

Doing any events this year? I am hoping to get into the PCA event on Saturday, and am currently on the waitlist.

[PrimeBMW]

Try HOD on the 26th of May. I'll be there. Strange your having issues on those slow left handers.

[larryn]

Originally Posted by PrimeBMW

Try HOD on the 27th of May. I'll be there. Strange your having issues on those slow left handers.

I'm not having issues at 11 at all. I do have issues on turn 9, which is an "oh shit" corner in this car. I'm used to keeping my foot down in the E92 while going around 9, I do that in this car, and I'm probably +10mph faster at the top of the hill for turn 10 turn-in, and you have a rough time keeping it on as you track out to the left towards 11, entering the braking zone. Fun stuff though!

I'll check out HOD. I've only done Thunderhill's 5mi course with them.

[PrimeBMW]

Originally Posted by larryn

I'm not having issues at 11 at all. I do have issues on turn 9, which is an "oh shit" corner in this car. I'm used to keeping my foot down in the E92 while going around 9, I do that in this car, and I'm probably +10mph faster at the top of the hill for turn 10 turn-in, and you have a rough time keeping it on as you track out to the left towards 11, entering the braking zone. Fun stuff though!

I'll check out HOD. I've only done Thunderhill's 5mi course with them.

Ah 9 makes more since but still something that should not be an issue with the new car. Hopefully there is an easy fix.

Side note: HOD runs a safe and professional day. Appropriate involvement for all experience levels. Short download meetings after each session so you can correct any bad or unsafe behavior. Pass anywhere with point in advanced group......and people point unlike other orgs. Did I mention safe? I have been with a few other groups that didn't have control of the situation and something bad could of happened.

[CSBM5]

Originally Posted by M3Tooner

Maybe this new suction strainer is already in production across the board for regular M3/4's as well, not just for the GTS. I'm saying this because in another post, I also found this same document describing that the GTS engine bedplate is different then the regular S55, but then was quickly informed by a forum member that BMW has since superseded the old block part number with this new stronger bedplate. So now all S55 blocks starting Dec 2015 production will have this freebie upgrade.

There was a superseded part number for the fuel pump/filter/level sensor unit. The old P/N is 16117853942 that was used up to 11/2014 production. The new P/N is 16112284693. Perhaps this updated part cures the problem?

[larryn]

Originally Posted by CSBM5

There was a superseded part number for the fuel pump/filter/level sensor unit. The old P/N is 16117853942 that was used up to 11/2014 production. The new P/N is 16112284693. Perhaps this updated part cures the problem?

My car is a 11/2015 prod car. So, most of us would have that newer part (2014).

[larryn]

Originally Posted by PrimeBMW

Ah 9 makes more since but still something that should not be an issue with the new car. Hopefully there is an easy fix.

Side note: HOD runs a safe and professional day. Appropriate involvement for all experience levels. Short download meetings after each session so you can correct any bad or unsafe behavior. Pass anywhere with point in advanced group......and people point unlike other orgs. Did I mention safe? I have been with a few other groups that didn't have control of the situation and something bad could of happened.

HOD does run a good event, and I had a great time with them at Thunderhill. I usually run with BMWCCA, PCA and Turn2. I also happen to like the open track days with all advanced drivers with on/off privs all day long. There's only a few clubs that do that out here. Doing a couple ORP days in a three weeks with one of those open lapping groups.

[CSBM5]

Originally Posted by larryn

My car is a 11/2015 prod car. So, most of us would have that newer part (2014).

Oh well, it was worth a shot. One would think that if *all* cars manufactured had this issue, they would have sorted it by now. Of course with BMW's strongly focused interest on cost reduction, that's likely not the case anymore. This would fall to be a low priority fix I would imagine.