Fuel starvation, who else?

Zeto · 08-26-2011, 08:32 PM

Quote:

Originally Posted by Synack

Been over a month now, maybe 2 months now, and the replacement fuel sending units have done great for me. I can even get the car down to ZERO dots worth of gas now and it'll run. Haven't ran outta gas in forever.

What kind of tires?

ChrisSlicks · 08-26-2011, 08:35 PM

Quote:

Originally Posted by phunk

Our first 2 pre-production units for the race level solution are currently in the CNC right now. These will be the final "prototypes" and unless we run into an issue, we shouldn't have to make any changes or updates. So we are writing all the final CNC programs and everything as we machine these components.

Excellent! Thanks for keeping us in the loop. Track season is nearly over for us in the North East, 2 or 3 more races for me and then it is time to step back and re-evaluate what the car needs over the Winter to remain competitive. Provided the components don't add too much weight (doesn't sound like it) then this could be a great way to run 60 pounds less fuel for competition.

Synack · 08-26-2011, 10:03 PM

Quote:

Originally Posted by ChrisSlicks

LOL, let me drive.

I have very highly spirited driving.... My tires have wires coming out of them.

Zeto · 08-27-2011, 10:07 PM

Quote:

Originally Posted by Synack

I have very highly spirited driving.... My tires have wires coming out of them.

1) That's not very smart.

2) That just lessens the issue since you have a low grip on your tire. (since you say that they are on wires)

3. Get some stickier tires and hit the track. That is the true test.

phunk · 08-27-2011, 10:38 PM

Quote:

Originally Posted by Synack

Been over a month now, maybe 2 months now, and the replacement fuel sending units have done great for me. I can even get the car down to ZERO dots worth of gas now and it'll run. Haven't ran outta gas in forever.

it sounds like you are talking about an entirely separate issue.

i run my Z until there are no dots of gas left just about every single tank. the car runs and drives fine.

the fuel starvation issue that this particular thread is discussing is unrelated to the calibration of the fuel level sending units and their accuracy.

we are all talking about fuel placement control inside the gas tank. when making a hard right, the gasoline shifts to the left side of the tank. the fuel pump cannot draw in the fuel momentarily until it settles and also siphons some over, so the engine starves of fuel and cuts power for a few seconds. the lower your fuel level, the more prone to this issue you become.

in some cases it can be worse. if you manage to relocate nearly every last bit of your fuel over to the left side of the tank (you could even have a gallon or two over there), the car is dead and will not run until you put more gas in it. that is because the siphon that pulls the fuel from the left side of the tank to the right side (this gas tank is divided in half by the driveshaft, shaped like saddle-bags) is a venturi that is powered by the fuel dumped out from the fuel pressure regulator inside the fuel pump sending unit. if the pump isnt pumping fuel, then the venturi dies, and there is no more siphoning action.

this can leave you stranded on the side of the road, it happened to me once. with 1/4 tank of gas according to the gauge.

no replacement sending units from nissan are going to fix this issue. this is not actually a concern of theirs. nearly all factory vehicles have this issue, in some cars it worse than others. ours is pretty bad due to some of the specifics of our fuel system layout.

but alas, i have the answer.

Synack · 08-27-2011, 11:40 PM

Quote:

Originally Posted by phunk

it sounds like you are talking about an entirely separate issue.

i run my Z until there are no dots of gas left just about every single tank. the car runs and drives fine.

the fuel starvation issue that this particular thread is discussing is unrelated to the calibration of the fuel level sending units and their accuracy.

we are all talking about fuel placement control inside the gas tank. when making a hard right, the gasoline shifts to the left side of the tank. the fuel pump cannot draw in the fuel momentarily until it settles and also siphons some over, so the engine starves of fuel and cuts power for a few seconds. the lower your fuel level, the more prone to this issue you become.

in some cases it can be worse. if you manage to relocate nearly every last bit of your fuel over to the left side of the tank (you could even have a gallon or two over there), the car is dead and will not run until you put more gas in it. that is because the siphon that pulls the fuel from the left side of the tank to the right side (this gas tank is divided in half by the driveshaft, shaped like saddle-bags) is a venturi that is powered by the fuel dumped out from the fuel pressure regulator inside the fuel pump sending unit. if the pump isnt pumping fuel, then the venturi dies, and there is no more siphoning action.

this can leave you stranded on the side of the road, it happened to me once. with 1/4 tank of gas according to the gauge.

no replacement sending units from nissan are going to fix this issue. this is not actually a concern of theirs. nearly all factory vehicles have this issue, in some cars it worse than others. ours is pretty bad due to some of the specifics of our fuel system layout.

but alas, i have the answer.

I've definitely had this problem at the track, drifting. More than a quarter tank and it just dies. No fun.

Quote:

Originally Posted by Zeto

1) That's not very smart.

2) That just lessens the issue since you have a low grip on your tire. (since you say that they are on wires)

3. Get some stickier tires and hit the track. That is the true test.

I was at the track on my Hankook's and after the session the tires had wires coming out, because I used every damn bit of tread. I have more tires on my porch.

ResIpsa · 09-05-2011, 01:02 PM

Quote:

Originally Posted by Synack

I have very highly spirited driving.... My tires have wires coming out of them.

Check this out!

ChrisSlicks · 09-05-2011, 01:08 PM

Quote:

Originally Posted by ResIpsa

Check this out!

I'd say that is almost worn out.

spearfish25 · 09-05-2011, 09:55 PM

RE-11 slicks. Cool.

WWJD · 09-05-2011, 10:15 PM

After I read through 16 pages, it doesn't seem like there's any plug and play solution available yet? I bet whoever makes it first and put in market will sell a bunch in no time.
The Z had this problem at Buttonwillow and Big willow even on stock shitty tires. Damn it...

Elysium · 09-06-2011, 03:43 PM

So I've been exchanging pm's with Phunk and expressing interest to be one of the first to get his new setup. How many others are interested?

1. Elysium

ChrisSlicks · 09-06-2011, 03:57 PM

I'm definitely interested as long as there isn't too much added weight.

zinistr · 09-06-2011, 03:58 PM

I am ready...assuming the cost isn't astronomical.

nismo09 · 09-06-2011, 04:01 PM

Quote:

Originally Posted by Elysium

So I've been exchanging pm's with Phunk and expressing interest to be one of the first to get his new setup. How many others are interested?

1. Elysium

Count me in.

travisjb · 09-06-2011, 04:16 PM

Quote:

Originally Posted by Elysium

So I've been exchanging pm's with Phunk and expressing interest to be one of the first to get his new setup. How many others are interested?

1. Elysium

My setup gets me down 9 gallons from full but sure would be nice to be able to drive it all the way down to empty or close to it... count me in if it can do that, and if he stays on track with his price target.

09-05-2011, 09:55 PM	#234 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	RE-11 slicks. Cool. __________________ 2013 Cadillac V-Wagon, RIP Z

09-06-2011, 03:43 PM	#236 (permalink)
Elysium Base Member Join Date: Mar 2011 Location: Ontario Posts: 133 Drives: 2013 GT-R, 2008 Sti Rep Power: 14	So I've been exchanging pm's with Phunk and expressing interest to be one of the first to get his new setup. How many others are interested? 1. Elysium __________________ 2013 GT-R black edition.....with mods to come 2010 370Z stillen supercharged.....will be missed

09-06-2011, 03:57 PM	#237 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	I'm definitely interested as long as there isn't too much added weight. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

09-06-2011, 03:58 PM	#238 (permalink)
zinistr Premium Member Join Date: Jul 2009 Location: Chardon, Ohio Posts: 127 Drives: 2009 Nismo - Silver Rep Power: 16	I am ready...assuming the cost isn't astronomical. __________________ 1970 Datsun 240z (HLS #201) & '71 240z "Zuns Z" 1991 300zx TT 'ZINISTR' & '93 300zx Vert TT "MASTR" 1994 300zx Vert 'BREEZZY' & 1995 300zx Z32 Coupe 2009 NISMO Edition 370Z, Silver #196

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09-05-2011, 10:15 PM	#235 (permalink)
WWJD Enthusiast Member Join Date: Jun 2010 Location: SoCal Posts: 396 Drives: PW 370Z Rep Power: 15	After I read through 16 pages, it doesn't seem like there's any plug and play solution available yet? I bet whoever makes it first and put in market will sell a bunch in no time. The Z had this problem at Buttonwillow and Big willow even on stock shitty tires. Damn it...