Autocross questions

mdxj · 06-14-2012, 12:29 AM

Quote:

Originally Posted by Shamu

Feedback on runs. Walk the course more as you were not sure where you were going at times from what I could see. You can carry more speed in turns than you were. Try not to coast so much. Goal should be on throttle or on brakes. On spinning. My rule is you don't spin at least once as a nwer driver you're not figuring limits of your car at a local ax event. Save the no spinning stuff for national competitions.

I stopped counting how many times I spun or went into a slide when I first started. I think only half of my runs even counted but that's the only way to learn plus in most autox courses, there is almost zero chance of hitting anything but a cone when you do spin, unless of course some random person drives a golf cart through the course ...

danegrey · 06-14-2012, 07:43 PM

This is a great thread, read it all today not just parts.
I ran an AutoX last Sunday, and for the class did not do too bad. I was running with a local club that follows NASA rules, so I was in BS, which also had a 91 CRX, 99 Mazda Miata, 93 Honda Civic, which all did sub 50's. Those were pure autox cars based on mods. In the mostly stock cars I was in the hunt. I turned a 54.501 just behind a 2010 Camero SS that did a 54.343.

Any how, I ran tire pressures of 38 front / 35 rear, its 100% a stock car. My biggest question is understeer, Now I am not quite sure if was lack of grip, lead foot or what. The rear's stuck with the 35 pressure.

I use my left foot for braking, so I got it into 2nd and left there. I feather it through the turns via braking and throttle. It was fun.

So anyone has any suggestions as to what I my problem might be.

mdxj · 06-14-2012, 07:51 PM

Is your car a base or sport package?

cossie1600 · 06-14-2012, 08:26 PM

Car doesn't turn from the factory. It is worse when you have the OEM tires, there just isn't enough grip to turn the cow. You just need to back off and be patient. You can left foot brake in this car, but you can't ride the brake pedal while you are on the gas as there is a throttle override. Buy some autox tires and practice, that's all you can do.

Quote:

Originally Posted by danegrey

This is a great thread, read it all today not just parts.
I ran an AutoX last Sunday, and for the class did not do too bad. I was running with a local club that follows NASA rules, so I was in BS, which also had a 91 CRX, 99 Mazda Miata, 93 Honda Civic, which all did sub 50's. Those were pure autox cars based on mods. In the mostly stock cars I was in the hunt. I turned a 54.501 just behind a 2010 Camero SS that did a 54.343.

Any how, I ran tire pressures of 38 front / 35 rear, its 100% a stock car. My biggest question is understeer, Now I am not quite sure if was lack of grip, lead foot or what. The rear's stuck with the 35 pressure.

I use my left foot for braking, so I got it into 2nd and left there. I feather it through the turns via braking and throttle. It was fun.

So anyone has any suggestions as to what I my problem might be.

Shamu · 06-14-2012, 08:28 PM

Quote:

Originally Posted by danegrey

This is a great thread, read it all today not just parts.
I ran an AutoX last Sunday, and for the class did not do too bad. I was running with a local club that follows NASA rules, so I was in BS, which also had a 91 CRX, 99 Mazda Miata, 93 Honda Civic, which all did sub 50's. Those were pure autox cars based on mods. In the mostly stock cars I was in the hunt. I turned a 54.501 just behind a 2010 Camero SS that did a 54.343.

Any how, I ran tire pressures of 38 front / 35 rear, its 100% a stock car. My biggest question is understeer, Now I am not quite sure if was lack of grip, lead foot or what. The rear's stuck with the 35 pressure.

I use my left foot for braking, so I got it into 2nd and left there. I feather it through the turns via braking and throttle. It was fun.

So anyone has any suggestions as to what I my problem might be.

I thought throttle cut on our cars as soon as brakes are engaged. did your year not have throttle cut when your on brakes? Left foot braking with throttle off is ...well braking

Car with stock tires and alignment will understeer. You need bigger front tires and some negative camber up front to control understeer.

ChrisSlicks · 06-15-2012, 02:08 AM

Quote:

Originally Posted by Shamu

I thought throttle cut on our cars as soon as brakes are engaged. did your year not have throttle cut when your on brakes? Left foot braking with throttle off is ...well braking

If will give you about 10% throttle with the foot on the brake, but yeah not much. You can defeat that system by pulling the brake light fuse which is fine for auto-x.

danegrey · 06-15-2012, 03:39 PM

Quote:

Originally Posted by mdxj

Is your car a base or sport package?

Its the sports package

danegrey · 06-15-2012, 03:40 PM

Quote:

Originally Posted by cossie1600

Car doesn't turn from the factory. It is worse when you have the OEM tires, there just isn't enough grip to turn the cow. You just need to back off and be patient. You can left foot brake in this car, but you can't ride the brake pedal while you are on the gas as there is a throttle override. Buy some autox tires and practice, that's all you can do.

No I do not ride the brake while on the gas, I gas and brake through the wider turns.

What is throttle override?

cossie1600 · 06-15-2012, 03:55 PM

Safety feature, it wont let you ride both pedal at the same time. You get 10 to 15% engine power while brakes are on

danegrey · 06-15-2012, 05:04 PM

Thanks all for the input, this will give me food for thought, until the next time I get to autocross....

gomer_110 · 06-18-2012, 08:28 PM

Quote:

Originally Posted by cossie1600

Safety feature, it wont let you ride both pedal at the same time. You get 10 to 15% engine power while brakes are on

F***ing Toyota. If it wasn't for their sticking accelerator pedal this PITA feature probably wouldn't exist.

cossie1600 · 06-18-2012, 09:44 PM

Umm no, it was in many cars prior to the fake cases. Ask Subaru owners

ChrisSlicks · 06-18-2012, 10:29 PM

Quote:

Originally Posted by cossie1600

Umm no, it was in many cars prior to the fake cases. Ask Subaru owners

And Porsche and BMW. Even the GT3 RS has this feature.

At least it is easy to work around on the Z, probably not so easy on some other platforms.

gomer_110 · 06-18-2012, 10:51 PM

I stand corrected.

Shamu · 06-19-2012, 09:35 AM

Quote:

Originally Posted by ChrisSlicks

And Porsche and BMW. Even the GT3 RS has this feature.

At least it is easy to work around on the Z, probably not so easy on some other platforms.

Yeah go figure! It's been around for long time my 2006 Mazda had same programming. My new 2012 Jeep Grand Cherokee allows braking and throttle at same time. Guess you have to buy SUV to left foot brake in new car!

06-14-2012, 07:51 PM	#168 (permalink)
mdxj Enthusiast Member Join Date: Nov 2011 Location: OKC Posts: 290 Drives: 09 Nismo, 98 Jeep XJ Rep Power: 14	Is your car a base or sport package? __________________ '09 370 base - RIP '09 370 Nismo - New track car

06-18-2012, 10:51 PM	#179 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	I stand corrected. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

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06-14-2012, 07:43 PM	#167 (permalink)
danegrey A True Z Fanatic Join Date: Oct 2011 Location: Knoxville Age: 71 Posts: 3,190 Drives: 12 370Z BK Cherry M6 Rep Power: 649540	This is a great thread, read it all today not just parts. I ran an AutoX last Sunday, and for the class did not do too bad. I was running with a local club that follows NASA rules, so I was in BS, which also had a 91 CRX, 99 Mazda Miata, 93 Honda Civic, which all did sub 50's. Those were pure autox cars based on mods. In the mostly stock cars I was in the hunt. I turned a 54.501 just behind a 2010 Camero SS that did a 54.343. Any how, I ran tire pressures of 38 front / 35 rear, its 100% a stock car. My biggest question is understeer, Now I am not quite sure if was lack of grip, lead foot or what. The rear's stuck with the 35 pressure. I use my left foot for braking, so I got it into 2nd and left there. I feather it through the turns via braking and throttle. It was fun. So anyone has any suggestions as to what I my problem might be.

06-15-2012, 03:55 PM	#174 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	Safety feature, it wont let you ride both pedal at the same time. You get 10 to 15% engine power while brakes are on

06-15-2012, 05:04 PM	#175 (permalink)
danegrey A True Z Fanatic Join Date: Oct 2011 Location: Knoxville Age: 71 Posts: 3,190 Drives: 12 370Z BK Cherry M6 Rep Power: 649540	Thanks all for the input, this will give me food for thought, until the next time I get to autocross....

06-18-2012, 09:44 PM	#177 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	Umm no, it was in many cars prior to the fake cases. Ask Subaru owners