Autocross questions

cossie1600 · 06-14-2012, 07:26 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.

danegrey · 06-15-2012, 02:40 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?

Shamu · 06-14-2012, 07:28 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, 01:08 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.

mdxj · 06-14-2012, 06:51 PM

Is your car a base or sport package?

danegrey · 06-15-2012, 02:39 PM

Quote:

Originally Posted by mdxj

Is your car a base or sport package?

Its the sports package

cossie1600 · 06-15-2012, 02:55 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

gomer_110 · 06-18-2012, 07:28 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.

danegrey · 06-15-2012, 04:04 PM

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

cossie1600 · 06-18-2012, 08:44 PM

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

ChrisSlicks · 06-18-2012, 09:29 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.

Shamu · 06-19-2012, 08:35 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!

gomer_110 · 06-18-2012, 09:51 PM

I stand corrected.

Blue Gumby · 06-21-2012, 12:58 PM

Just picked up a Z w/ sports package. Looking for tires for RTR class. Noticed people talk about Re11 in 285/35/19, but how about 275/30/19 size.

Cons are smaller contact patch, 84 bucks more for narrower tire (tire rack).

Pros include better rim fitment, lowers car more than half inch (1.3 inch diff) for more camber and better C.G., better gearing = better acceleration, 2 pounds lighter per corner.

Anyone tried the Koni yellows for autocross yet? Was thinking picking up a set and sending them to Lee Grimes for revalve and degassing. AST are nice but too much money.

cossie1600 · 06-21-2012, 01:08 PM

I am all about saving money, but you have to pay to play. I think you will get tons more wheelspin and the bigger tire will not overheat quite as easily

06-14-2012, 06:51 PM	#5 (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, 09:51 PM	#13 (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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06-15-2012, 02:55 PM	#7 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 31	Safety feature, it wont let you ride both pedal at the same time. You get 10 to 15% engine power while brakes are on

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06-18-2012, 08:44 PM	#10 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 31	Umm no, it was in many cars prior to the fake cases. Ask Subaru owners

06-21-2012, 12:58 PM	#14 (permalink)
Blue Gumby Base Member Join Date: Jun 2012 Location: new york Posts: 31 Drives: 370z Rep Power: 14	Just picked up a Z w/ sports package. Looking for tires for RTR class. Noticed people talk about Re11 in 285/35/19, but how about 275/30/19 size. Cons are smaller contact patch, 84 bucks more for narrower tire (tire rack). Pros include better rim fitment, lowers car more than half inch (1.3 inch diff) for more camber and better C.G., better gearing = better acceleration, 2 pounds lighter per corner. Anyone tried the Koni yellows for autocross yet? Was thinking picking up a set and sending them to Lee Grimes for revalve and degassing. AST are nice but too much money.

06-21-2012, 01:08 PM	#15 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 31	I am all about saving money, but you have to pay to play. I think you will get tons more wheelspin and the bigger tire will not overheat quite as easily