DDMotorsports: Redline Time Attack Round #7

M.Bonanni · 09-30-2009, 07:20 PM

Quote:

Originally Posted by travisjb

Congrats ! Z is really proving itself as a capable track car... we're all converging on the same issues mechanically. We need some creative solutions for the fuel issue in form of baffling in tank, swirl pot outside tank, or complete fuel system replacement for the racers.

With the understeer, any second thoughts on trying out a 'square' tire setup? I'm dying to find out how the car would perform with that kind of setup. Maybe also a front splitter... was it high speed or low speed or both?

It was definitely mechanical, not aero related, but aero up front would help at higher speeds. As for a square tire setup, I still think the car likes a little stagger. If I had more practice time with the car I can guarantee you I could have gotten the understeer to go away but with only one lap at a time I only had a few opportunities to see if my adjustments helped. By the end of the weekend it was much better than where we started. I don't think it is a chronic problem or a big enough problem to change my equipment, just need to find the happy spot in the settings.

Mike · 09-30-2009, 08:12 PM

So, on the fuel starvation issue. I experienced the same thing today on my car at Road Atlanta during the BMW Oktoberfest lapping days, turns 1 and 7 (right handers). Oil temp was approaching 260 and I thought and was focusing on that. Took a couple cool down laps, then went at it again going into the back half of the track, but for me, coming out of turn 7, the car totally died.

It wouldn't restart and fuel gauge showed empty. Wound up getting towed in, then filled it up and it only took under 14 gallons to fill it completely.

Now that I know what it was, I think that if I had ever completely shut the car off and then restarted it would have worked, but I never did that since I thought it was out of gas (even though it was half full when I started, after 3 previous sessions), and the car thought it was out, so it shut down the gauge and fuel pump?

Regardless, its very embarrassing to get towed off the track, especially at a national BMW event for running out of gas. Other than that, the car is feeling pretty good.

MightyBobo · 09-30-2009, 08:40 PM

Sorry, cant help but chuckle a little. I dont think I'd go out with anything less than 1/3rd of a tank at least....

Mike · 09-30-2009, 09:13 PM

Quote:

Originally Posted by MightyBobo

Sorry, cant help but chuckle a little. I dont think I'd go out with anything less than 1/3rd of a tank at least....

I had half a tank, and when you use almost a quarter tank per session, its kind of inconvenient and ridiculous to fill up every session, although I think I will be from now on. My 350z and my C6 never had a problem like this, nor do probably any other car on the track on any given weekend.

MightyBobo · 09-30-2009, 10:22 PM

Some silly things it seems Nissan overlooked in their sports car, it seems lol

B1nks · 09-30-2009, 11:29 PM

What would just be down right awesome in a can would be if Nismo would come out with parts to correct this causing warranty to stay in tact. I'm sure you guys aren't worried about that but having the parts be factory backed isn't such a bad thing and it isn't like Nismo doesn't have racing experience.

travisjb · 09-30-2009, 11:36 PM

Quote:

Originally Posted by MightyBobo

Sorry, cant help but chuckle a little. I dont think I'd go out with anything less than 1/3rd of a tank at least....

I've had fuel starvation and throttle cut out with only 5 bars from full. I've had the engine cut off completely and not been able to restart with half a tank... had to coast off the track, and likewise was unable to diagnose the cause - thought it might have been electronic or oil temp related, but turned out to be fuel starvation.

We need a dedicated thread on fuel starvation in the track section focused on solutions (not whining). Who's gonna start it ?

Mike · 10-01-2009, 08:36 AM

Quote:

Originally Posted by travisjb

We need a dedicated thread on fuel starvation in the track section focused on solutions (not whining). Who's gonna start it ?

I did, and Valentino offered one possible solution there.
Fuel starvation, who else?

09-30-2009, 08:12 PM	#17 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	So, on the fuel starvation issue. I experienced the same thing today on my car at Road Atlanta during the BMW Oktoberfest lapping days, turns 1 and 7 (right handers). Oil temp was approaching 260 and I thought and was focusing on that. Took a couple cool down laps, then went at it again going into the back half of the track, but for me, coming out of turn 7, the car totally died. It wouldn't restart and fuel gauge showed empty. Wound up getting towed in, then filled it up and it only took under 14 gallons to fill it completely. Now that I know what it was, I think that if I had ever completely shut the car off and then restarted it would have worked, but I never did that since I thought it was out of gas (even though it was half full when I started, after 3 previous sessions), and the car thought it was out, so it shut down the gauge and fuel pump? Regardless, its very embarrassing to get towed off the track, especially at a national BMW event for running out of gas. Other than that, the car is feeling pretty good. __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

09-30-2009, 08:40 PM	#18 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 52	Sorry, cant help but chuckle a little. I dont think I'd go out with anything less than 1/3rd of a tank at least.... __________________ I don't own a car anymore.

09-30-2009, 10:22 PM	#20 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 52	Some silly things it seems Nissan overlooked in their sports car, it seems lol __________________ I don't own a car anymore.

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09-30-2009, 11:29 PM	#21 (permalink)
B1nks Track Member Join Date: Apr 2009 Location: Houston,Tx Posts: 721 Drives: 2009 370Z Base 6MT Rep Power: 507	What would just be down right awesome in a can would be if Nismo would come out with parts to correct this causing warranty to stay in tact. I'm sure you guys aren't worried about that but having the parts be factory backed isn't such a bad thing and it isn't like Nismo doesn't have racing experience.