phunk

iTrader: (21)

I would like to know if any of you, or how many of you, are dealing with having to run your fuel tank at near full levels on the race course in order to avoid fuel pump pickup starvation, which would be most likely to occur during a hard/sustained right turn.

Short story... the 370z experiences this problem 10x as bad as the 350z does. We had to design/test and now manufacture a "fix" for this. You honestly would not believe how bad it is in the 370z until you experience it yourself... I have never personally known another sports car to suffer from this issue nearly as bad.

Anyways, our product that solves this in the 370z could be very easily adapted for the 350z / G35 gas tank. I am curious if its worth considering a batch for the 350z / G35. I never ran into fuel starvation problems with my 350z on the street, but I never tracked it. I know already that its not nearly the issue that it is with the 370z... but if it is a problem that any of you are experiencing than its probably something we should consider retrofitting over.

Thanks

91rs13

Funny you posted this, as I was just searching to see if it is a common issue.

I ran at NJMP -Lightning on Monday and had issues with about a 1/4 of a tank of fuel or less in right handers. Also ran into it a little at Lime Rock Park in April, but not as bad.

Funny thing is, I ran these tracks the last 2 years and did not have the same issue. (only change to the car is wider wheels/tires--so perhaps more grip changing how bad the starvation is)

What is the fix? ( besides keeping more fuel in car)

2TH PWR

iTrader: (21)

I just looked at my data from my last track day. Looks like peak lateral G's were 1.51 and I didn't notice any problems running 1/4 tank.

2003 350Z.

phunk

iTrader: (21)

We have a product that basically keeps a constantly refilling small reserve storage tank around the pressure pump. Being much smaller than an entire gas tank, fuel does not have the means to escape the pump. These are commonly referred to as surge canisters, and are mounted in various places. We built one that mounts inside the gas tank, and we were able to take advantage of doing so and integrated some features that the typical surge can has never seen.

phunk

iTrader: (21)

Thanks for the post. Ya I can only remember one incident in my 350z, on a super long tollway entry ramp, and flooring it at 550+rwhp coming out of the ramp and that was good enough to make it stutter a little.

I have had a few guys over the years ask me about a solution for this in the 350z, but I just wasnt finding a problem myself.

terrasmak

iTrader: (8)

Under 1/2 tank on a couple of the tracks I hit, been thinking about building an external swirl pot to fix it. Would love to checkout your solution.

350z006

iTrader: (79)

Yes, sounds intersting...

laze1

iTrader: (17)

Yes, I get some fuel starvation in long Sprint races on right hand turns...like T7 @ Road Atlanta....

For Enduro events, I run the car until I get fuel starvation then pit for gas @ driver change

I think this would be a good product for most Spec Z racers

hndumafia

iTrader: (10)

I have this problem after right-handers when I hit around 1/4-1/3 tank remaining.

JETPILOT

iTrader: (51)

I had issues on the track with 3/4 of a tank. I installed a 1 liter aluminum surge tank. I feed the surge tank with the in tank Walbro pump. From the surge tank I run an Aeromotive pump to feed the injectors. The return from the injectors also feeds into the surge tank. The surge tank overflow goes back into the main tank. I'll post some pics a little later. I thinks it's the only sure way to never run lean. I'd like to see what your set up looks like.

Chebosto

iTrader: (43)

Phunk, you still doing this?

Italianjoe1

iTrader: (6)

I actually had this problem the other night getting on the highway, long RH sweeper, 270 degree turn going from west to southbound. Came out of the corner about 90mph and had a break up in 4th gear around 6000, didn't realize what it was, habit shifted to 5th and it kept popping when I tried to step back down. Had maybe 1/4 showing on the gauge, possibly less. First time in 3 years i've had that happen.

phunk

iTrader: (21)

The 370z model is like 98% done. I hope to be shipping them next week. Once its all done with, I can start figuring the required changes for the 350z.

The product that we built is a fuel pump assembly that is designed to be able to be used as a surge tank on the drivers side of the tank, or a standalone pump assembly to replace the stock one. To use it as a surge can design would require switching the main fuel pump assembly out to a 370z unit because it has exposed plumbing that can be intercepted inside the tank to make it all PnP outside the tank. While its also designed to be used as a standalone pump assembly, I have not done any testing in that configuration. It would make more sense to go straight to standalone use for the 350z so that you wouldnt have to get a 370z fuel pump assembly... but with no testing done on it that way, I would only want to build one or two to get out there for testing first.

Chebosto

iTrader: (43)

thanks for the update charles.

looking forward to it applied on the 350.. this was one of the major problems i had back in 09 and sorta in limbo since then...

xzotklr

iTrader: (2)

Here is the solution:

ACCUSUMP UNITS
Accusumps are oil reservoirs that connect to the engine's oiling system. They are designed to collect pressurized oil from your engine and store it so it may be discharge when oil pressure is low. Accusump Oil Accumulators deliver oil before starting to eliminate dry start scuffing (pre-oiling) and discharge oil during low oil pressure surges to protect against engine damage during demanding racing conditions. Accusump Turbo-Oilers deliver oil to turbos after shut down to lubricate and cool hot turbo components and prevent coke build up and turbo damage.

Link:

https://www.cantonracingproducts.com...&category=2410


The 3 Quart Accusump is ideal for V-8 and high horsepower V-6 and 4 cylinders engines. It is the original and has been providing pre-oiling and surge protection in all types of racing and recreational vehicles for over 30 years. Has a 16" long and 4-1/4" dia. body.





You're welcome.

Chebosto

iTrader: (43)

the stuff you posted is for engine oil ... this thread is for fuel system, unless you're implying they can be reused for fuel purposes?

phunk

iTrader: (21)

it would probably hold up in fuel no problem... its just a cylinder with a piston and orings in it.. real basic design. i doubt it would work very well since fuel pressure is under precise control unlike oil pressure where "any is better than none"... so long as you dont mind a giant cylinder of gasoline hanging off your car. i keep fuel storage in the fuel tank.

scotts300

iTrader: (46)

Yes, I have had this problem in the Z33 track car(s) and experienced it with the 370. It's no fun. The local shop, Z Car Garage, also has a 370Z fix that they are trying to adapt for the 350 as well. We will soon see; it sucks to have to donate all that extra weight when trying to get down to the 3100# requirement (with driver).

laze1

iTrader: (17)

Gas = 6.073 pounds per US Gallon.

scotts300

iTrader: (46)

Yup, so in my #219 car, I donate about 20# of gas just to keep from fuel starve. The #12 car was much worse, 40/45# donated. OT: I still have some weight to trim off this pig as well, so am shopping for a little battery.