The Official 370Z Autocross Thread

handyman · 05-06-2011, 08:33 AM

Yea, they actually fit pretty well. A bunch of the local autox guys were trying to convince me to go as far as 295 on all 4. I didn't want to push it, but after seeing the 285 fitment I definitely believe its doable.

cossie1600 · 05-06-2011, 09:37 AM

for dedicated race tires, i dont see why not. i just dont want to go that far for street tires

AutoX Z · 05-06-2011, 05:19 PM

I'll repeat what I told you before. Street tires do not respond to being squeezed onto rims the same way that R-comps do. In general you will get optimal grip with a street tire if it is square or slightly stretched on the rim.

handyman · 05-07-2011, 07:23 AM

Quote:

Originally Posted by AutoX Z

I'll repeat what I told you before. Street tires do not respond to being squeezed onto rims the same way that R-comps do. In general you will get optimal grip with a street tire if it is square or slightly stretched on the rim.

I totally agree, I was just surprised at how well the 285's fit. I expected them to be more of a squeeze.

cossie1600 · 05-06-2011, 05:30 PM

thats why i have 285, a slight pinch in the front to get the balance i need. i am not some ricer trying to jam 305s on my rim to look cool

cossie1600 · 05-08-2011, 01:13 PM

you are going to need modification regardless of which one, so just go custom

handyman · 05-15-2011, 06:41 PM

Had two autox's this weekend. Won the stock street tire class and placed top 10 pax in both. Still getting inside rear tire spin up on sweepers, and still fighting understeer (although its much better than before). Hopefully an alignment and front bar will help. Also, I still have a lot to improve with my driving, I'm definitely not as smooth as I could be and I'm not using trailbraking/weight transfer to my advantage enough, which would also help.

Thoughts on the RE-11's:
1. They love pressure! I started with 40f/35r and they sucked. I ended up with 47f/45r and was still rolling the fronts over a bit further than I would have liked. The higher pressure also helped a LOT with the numbness I previously felt on the street. The pressure in the rear didn't seem to have much effect, From 38 to 45 there wasn't much of a difference other than feeling slightly more crisp (times where the same)

2. They kick *** in the wet. On Saturday I was leading pax in the pouring rain in the morning, only to drop back to 10th once it dried out.

3. Good feedback. I could easily feel/hear understeer and the oversteer was nice and progressive*, which allowed for easy modulation.

*The only issue I had was once on a wet lap the back end completely let go without any warning. I may have hit a puddle or slick spot on the course, but it was very unnerving. Luckily it didn't happen again, so I'm chalking it up as a fluke.

Video of the winning lap today
Video of a very sloppy wet lap yesterday

ChrisSlicks · 05-15-2011, 07:34 PM

Those are some crazy high pressures, I never found it necessary to run them that high.

handyman · 05-15-2011, 07:56 PM

Thats what I thought too, but I was still rolling them over about halfway down the triangle which is already very low on the sidewall. Its worth noting that this was on a very grippy lot with stock camber.

I think I'm going to go ahead and order a pyrometer to help sort them out. The engineer in me needs more data

Chriz · 05-18-2011, 12:51 AM

Hey you guys, im autocrossing the Z for the first time this week, any recommended tire pressures for stock re050's?

ChrisSlicks · 05-18-2011, 07:09 AM

Quote:

Originally Posted by Chriz

Hey you guys, im autocrossing the Z for the first time this week, any recommended tire pressures for stock re050's?

Start with about 40 up front and 35 rear and see how you do and check the roll over.

AutoX Z · 05-18-2011, 08:09 PM

What Chris said will work, where are you racing at in Houston?

Chriz · 05-19-2011, 01:51 PM

Quote:

Originally Posted by AutoX Z

What Chris said will work, where are you racing at in Houston?

I'm actually heading to San Antonio to visit some friends and autocrossing at Retama Park hosted by sasca/spokes. Won't be my first time autocrossing but ive never taken the Z yet. I can't wait! Iv'e only driven a bone stock civic si and won novice class with it, so im expecting quite a difference.

I'ts also alot cheaper in san antonio compared to Houston. Only 25$ for non members. And thanks for the info Chris!

AutoX Z · 05-19-2011, 08:28 PM

Quote:

Originally Posted by Chriz

I'm actually heading to San Antonio to visit some friends and autocrossing at Retama Park hosted by sasca/spokes. Won't be my first time autocrossing but ive never taken the Z yet. I can't wait! Iv'e only driven a bone stock civic si and won novice class with it, so im expecting quite a difference.

I'ts also alot cheaper in san antonio compared to Houston. Only 25$ for non members. And thanks for the info Chris!

Well make sure to make it out to some Houston events too. The SCCA club here puts on first class events with some great competition and friends mixed in.

Shamu · 05-19-2011, 11:13 PM

You guys in Texas see my old FP Boxster yet?

YouTube - ‪FP #111 Texas SW Divisional Best Run‬&rlm;

05-06-2011, 05:19 PM	#3 (permalink)
AutoX Z Enthusiast Member Join Date: Jun 2009 Location: Houston, Tx Posts: 314 Drives: 370Z Base, Sport Rep Power: 18	I'll repeat what I told you before. Street tires do not respond to being squeezed onto rims the same way that R-comps do. In general you will get optimal grip with a street tire if it is square or slightly stretched on the rim. __________________ 2013 SCCA Solo National Champion VVV For Sale VVV

05-15-2011, 06:41 PM	#7 (permalink)
handyman Base Member Join Date: Jun 2010 Location: WV Posts: 45 Drives: 370Z Rep Power: 17	Had two autox's this weekend. Won the stock street tire class and placed top 10 pax in both. Still getting inside rear tire spin up on sweepers, and still fighting understeer (although its much better than before). Hopefully an alignment and front bar will help. Also, I still have a lot to improve with my driving, I'm definitely not as smooth as I could be and I'm not using trailbraking/weight transfer to my advantage enough, which would also help. Thoughts on the RE-11's: 1. They love pressure! I started with 40f/35r and they sucked. I ended up with 47f/45r and was still rolling the fronts over a bit further than I would have liked. The higher pressure also helped a LOT with the numbness I previously felt on the street. The pressure in the rear didn't seem to have much effect, From 38 to 45 there wasn't much of a difference other than feeling slightly more crisp (times where the same) 2. They kick *** in the wet. On Saturday I was leading pax in the pouring rain in the morning, only to drop back to 10th once it dried out. 3. Good feedback. I could easily feel/hear understeer and the oversteer was nice and progressive, which allowed for easy modulation. The only issue I had was once on a wet lap the back end completely let go without any warning. I may have hit a puddle or slick spot on the course, but it was very unnerving. Luckily it didn't happen again, so I'm chalking it up as a fluke. Video of the winning lap today Video of a very sloppy wet lap yesterday Last edited by handyman; 05-15-2011 at 06:48 PM.

05-15-2011, 07:34 PM	#8 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 655	Those are some crazy high pressures, I never found it necessary to run them that high. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

05-15-2011, 07:56 PM	#9 (permalink)
handyman Base Member Join Date: Jun 2010 Location: WV Posts: 45 Drives: 370Z Rep Power: 17	Thats what I thought too, but I was still rolling them over about halfway down the triangle which is already very low on the sidewall. Its worth noting that this was on a very grippy lot with stock camber. I think I'm going to go ahead and order a pyrometer to help sort them out. The engineer in me needs more data Last edited by handyman; 05-15-2011 at 08:05 PM.

05-18-2011, 12:51 AM	#10 (permalink)
Chriz Track Member Join Date: Dec 2009 Location: Houston TX Posts: 626 Drives: '10 370z PW 7AT Rep Power: 18	Hey you guys, im autocrossing the Z for the first time this week, any recommended tire pressures for stock re050's? __________________ PW 7AT w/Sports Pkg Hook Em!

05-06-2011, 08:33 AM	#1 (permalink)
handyman Base Member Join Date: Jun 2010 Location: WV Posts: 45 Drives: 370Z Rep Power: 17	Yea, they actually fit pretty well. A bunch of the local autox guys were trying to convince me to go as far as 295 on all 4. I didn't want to push it, but after seeing the 285 fitment I definitely believe its doable.

05-06-2011, 09:37 AM	#2 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 32	for dedicated race tires, i dont see why not. i just dont want to go that far for street tires

05-06-2011, 05:30 PM	#5 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 32	thats why i have 285, a slight pinch in the front to get the balance i need. i am not some ricer trying to jam 305s on my rim to look cool

05-08-2011, 01:13 PM	#6 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 32	you are going to need modification regardless of which one, so just go custom

05-18-2011, 08:09 PM	#12 (permalink)
AutoX Z Enthusiast Member Join Date: Jun 2009 Location: Houston, Tx Posts: 314 Drives: 370Z Base, Sport Rep Power: 18	What Chris said will work, where are you racing at in Houston? __________________ 2013 SCCA Solo National Champion VVV For Sale VVV

05-19-2011, 11:13 PM	#15 (permalink)
Shamu A True Z Fanatic Join Date: Jan 2011 Location: Nor Cal Posts: 1,059 Drives: 370Z Racecar Rep Power: 21	You guys in Texas see my old FP Boxster yet? YouTube - ‪FP #111 Texas SW Divisional Best Run‬&rlm; __________________ Grant

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