Fuel Starvation? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Lunatic · 05-28-2017, 11:50 PM

This weekend I was running Streets of Willow, counter clockwise. I started the day with a full tank of fuel. The last session of the day my car started acting funny. Going up the hill through the Chicane to the bowl I could run through the gears to 7500 no problem. But coming down hill turning left in the last two corners before the main straight my engine would just kind of go flat and not rev above 6000 rpm on the straight. I was down to a half a tank of fuel at this point. Do you think this could be a fuel sloshing problem from the half full tank and left hand turns?

stevesnj · 05-29-2017, 09:02 PM

Depends where the pickup strainer is.

zdr93523 · 05-29-2017, 09:57 PM

You can definitely starve on 1/2 tank, but shouldn't if the car is NA. It's a pretty big pop / immediate loss of power if you run the rails dry.

Sleepless · 05-29-2017, 10:18 PM

The 'won't rev past 6000 on the straight ' doesn't sound like a fuel starvation problem. In my experience a starvation occurs mid corner and goes away fairly soon; by corner exit depending on length of corner

zdr93523 · 05-29-2017, 10:43 PM

Quote:

Originally Posted by Sleepless

The 'won't rev past 6000 on the straight ' doesn't sound like a fuel starvation problem. In my experience a starvation occurs mid corner and goes away fairly soon; by corner exit depending on length of corner

Yea that sounds odd. I'll start to lose FP mid-corner and the power level / consumption sometimes won't let it recover and I'll end up starving at the end of a straight.

Lunatic · 05-30-2017, 08:42 AM

Quote:

Originally Posted by zdr93523

You can definitely starve on 1/2 tank, but shouldn't if the car is NA. It's a pretty big pop / immediate loss of power if you run the rails dry.

Supercharged on e-85

Jonsey · 05-30-2017, 10:33 AM

I was fuel starving my car N/A on E85 by 7/8th of a tank on a long, high-g left hander before going with a surge tank. It would starve right after corner exit and would last two or three seconds.

Lunatic · 05-30-2017, 12:47 PM

Quote:

Originally Posted by Jonsey

I was fuel starving my car N/A on E85 by 7/8th of a tank on a long, high-g left hander before going with a surge tank. It would starve right after corner exit and would last two or three seconds.

That sounds like what I was experiencing.

Sleepless · 05-30-2017, 03:46 PM

Do you have a data log with RPM, speed and throttle position?

Lunatic · 05-30-2017, 04:56 PM

Quote:

Originally Posted by Sleepless

Do you have a data log with RPM, speed and throttle position?

No.

2superblus · 05-31-2017, 10:46 AM

Are you running with stability or traction control on?

Lunatic · 05-31-2017, 06:25 PM

Quote:

Originally Posted by 2superblus

Are you running with stability or traction control on?

NO

Lunatic · 05-31-2017, 06:35 PM

I was able to do some test pulls today. rev to 7500, up to 120 mph with no trouble, engine pulled hard all the way and wide band O2 never leaned out. So I'm guessing it was just the half full tank and the track configuration that was causing my problems.

georgiafrsguy · 05-31-2017, 08:45 PM

you def had fuel starvation at half tank with your setup for sure. welcome to the club. gonna have to keep full tank or get surge tank setup. couldn't run Atlanta motorsports park n/a with half a tank without starving

05-28-2017, 11:50 PM	#1
Lunatic Senior Member Join Date: Jan 2014 Drives: 2015 Raven FRS Location: Indio, CA. Just an Old Fart in a Automatic!. Posts: 1,614 Thanks: 7 Thanked 1,056 Times in 488 Posts Mentioned: 40 Post(s) Tagged: 2 Thread(s)	Fuel Starvation? This weekend I was running Streets of Willow, counter clockwise. I started the day with a full tank of fuel. The last session of the day my car started acting funny. Going up the hill through the Chicane to the bowl I could run through the gears to 7500 no problem. But coming down hill turning left in the last two corners before the main straight my engine would just kind of go flat and not rev above 6000 rpm on the straight. I was down to a half a tank of fuel at this point. Do you think this could be a fuel sloshing problem from the half full tank and left hand turns?

05-29-2017, 09:02 PM	#2
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	Depends where the pickup strainer is. __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

05-29-2017, 10:18 PM	#4
Sleepless Senior Member Join Date: Apr 2014 Drives: 2014 BRZ Location: Redmond, WA Posts: 639 Thanks: 299 Thanked 392 Times in 229 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	The 'won't rev past 6000 on the straight ' doesn't sound like a fuel starvation problem. In my experience a starvation occurs mid corner and goes away fairly soon; by corner exit depending on length of corner __________________ Pete 14 Track BRZ (Build Thread) cmslaptimer.com

05-30-2017, 10:33 AM	#7
Jonsey Senior Member Join Date: May 2014 Drives: 2013 FR-S Location: DFW Posts: 272 Thanks: 369 Thanked 216 Times in 112 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	I was fuel starving my car N/A on E85 by 7/8th of a tank on a long, high-g left hander before going with a surge tank. It would starve right after corner exit and would last two or three seconds. __________________ "It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt." Mark Twain

05-30-2017, 03:46 PM	#9
Sleepless Senior Member Join Date: Apr 2014 Drives: 2014 BRZ Location: Redmond, WA Posts: 639 Thanks: 299 Thanked 392 Times in 229 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Do you have a data log with RPM, speed and throttle position? __________________ Pete 14 Track BRZ (Build Thread) cmslaptimer.com

05-31-2017, 10:46 AM	#11
2superblus Senior Member Join Date: Sep 2012 Drives: 13 BRZ WRB Location: Wiscowsin Posts: 269 Thanks: 71 Thanked 132 Times in 78 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Are you running with stability or traction control on?

05-31-2017, 06:35 PM	#13
Lunatic Senior Member Join Date: Jan 2014 Drives: 2015 Raven FRS Location: Indio, CA. Just an Old Fart in a Automatic!. Posts: 1,614 Thanks: 7 Thanked 1,056 Times in 488 Posts Mentioned: 40 Post(s) Tagged: 2 Thread(s)	I was able to do some test pulls today. rev to 7500, up to 120 mph with no trouble, engine pulled hard all the way and wide band O2 never leaned out. So I'm guessing it was just the half full tank and the track configuration that was causing my problems.

05-31-2017, 08:45 PM	#14
georgiafrsguy Member Join Date: Dec 2015 Drives: white 2013 frs Location: atlanta georgia Posts: 62 Thanks: 0 Thanked 9 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	you def had fuel starvation at half tank with your setup for sure. welcome to the club. gonna have to keep full tank or get surge tank setup. couldn't run Atlanta motorsports park n/a with half a tank without starving

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