Autocross on factory run flats?

fixation88 · 03-22-2011, 09:28 PM

Hi Guys,

I did some searching but didn't find anything, so here it is.

I'm a new 135i owner. Have a decent amount of AutoX experience with a FD RX7. With the RX7 sold, I'm looking to get some seat time in my 135i. I have the factory run flats on the 135i now and am considering several AutoX events this spring and summer to get a good feel of the car. Has anyone AutoX'd with the factory run flats? With all the issues with the infamous run flats, I'm a little concerned.

Thanks! George

Amalfitano · 03-22-2011, 10:05 PM

i don't think there's anything to worry about really. The Star Specs were faster once they scrubbed in a bit. The turn-in on the bridgestones was pretty good, but the overall grip wasn't the best, but honestly was better than most oem out there. The grip limit will help get the car where it really wants to be. Slow is fast and all, but REALLY with this car. there's a point of body roll where the car is just a plow. these tires might get you to slow down well enough for some manuevers that a better tire would then really really benefit now.

Lubo · 03-22-2011, 10:05 PM

Quote:

Originally Posted by fixation88

Hi Guys,

I did some searching but didn't find anything, so here it is.

I'm a new 135i owner. Have a decent amount of AutoX experience with a FD RX7. With the RX7 sold, I'm looking to get some seat time in my 135i. I have the factory run flats on the 135i now and am considering several AutoX events this spring and summer to get a good feel of the car. Has anyone AutoX'd with the factory run flats? With all the issues with the infamous run flats, I'm a little concerned.

Thanks! George

Stock RFT were actually really good in terms of dry grip and it was really hard to roll them over. Only downside is the narrow footprint upfront.

bluesunit · 03-22-2011, 11:19 PM

Grip isn't half bad, but the RFTs have issues with heat dissipation. I've seen a lot of them (mine included) that start to severely deteriorate after a handful of runs. They begin to shed material like crazy.

I'll post some pictures tomorrow.

TrojanBMW · 03-23-2011, 12:15 AM

I ran my first HPDE on the RFTs and had no issues at all, just watch the tire pressures.

They won't grip like a good set of non-RFTs, but they should be OK.

Xaeryan · 03-23-2011, 08:33 AM

Quote:

Originally Posted by bluesunit

Grip isn't half bad, but the RFTs have issues with heat dissipation. I've seen a lot of them (mine included) that start to severely deteriorate after a handful of runs. They begin to shed material like crazy.

I'll post some pictures tomorrow.

You already have them up, just need this:

http://www.1addicts.com/forums/showthread.php?t=417653

fixation88 · 03-23-2011, 02:31 PM

Thanks for the great feeback guys! My plan is to run the RFTs to shreds and get a spare set of wheels and tires for the winter. Next Spring, probably some star specs... they are awesome!

MarkRacerX · 04-16-2011, 01:06 AM

I just ran my 1st Autocross in my 135i on stock RFT's I just started at 50psi and they did good, no rolling issues at all, They spin easy and you don't even hear any screatching, so not even trying to grip, For stock they are decent, I was surprised I took 1st in DS 1st time racing the 135i 100% stock setup. Fun Car!!

Hops128i · 04-19-2011, 06:30 PM

Quote:

Originally Posted by MarkRacerX

I just ran my 1st Autocross in my 135i on stock RFT's I just started at 50psi ....

Wow! 50psi. I did an autocross school a couple of months ago and ran 40psi. and started to get the outside wear pattern seen the link a few posts previous to this on. I guess i need 50psi?

MarkRacerX · 04-21-2011, 11:45 PM

Quote:

Originally Posted by Hops128i

Wow! 50psi. I did an autocross school a couple of months ago and ran 40psi. and started to get the outside wear pattern seen the link a few posts previous to this on. I guess i need 50psi?

Yeah, 50psi did great for me. Was a 2nd gear track pretty much, few areas top of 2nd. Good luck!

fboutlaw · 04-22-2011, 12:32 AM

So it's totally doable. Initial turn in response is really good, but you won't hold any corners. Slow is not fast, it's slow. Use the autox to practice drifting!

MarkRacerX · 04-23-2011, 03:40 AM

Nice Pics!! The 135i just looks Soo good out on the track being pushed, I have almost same pic of mine turning w/ front tire tucking in wheel well

Looks Great !!

hatepotholez · 07-11-2014, 11:41 AM

Bumping this old thread. Is it better to run stock psi's, 40psi's all around or 50 psi's all around? Last autox event I was on stock psi's.

Zsanz · 07-11-2014, 12:13 PM

Chalk the tires, adjust accordingly.

hatepotholez · 07-11-2014, 01:36 PM

Quote:

Originally Posted by Zsanz

Chalk the tires, adjust accordingly.

Thanks, completely forgot about that. Shoe polish is another option.

Ginger_Extract · 07-11-2014, 09:25 PM

Nope, they're gonna blow up for sure. People bash the RFT's too much. In terms of performance, they really aren't too much worse than the hot street tires from a few years ago. I autox'd my 1'er when it was showroom stock, and it was fine. However, I get the feeling that they would not take well to aggressive track driving.

claysones · 07-17-2014, 09:26 AM

do you guys think run flats wear faster on autoX than normal all season semi performance tires?

03-22-2011, 09:28 PM	#1
fixation88 Enlisted Member 2 Rep 39 Posts Drives: '08 135i Join Date: Mar 2011 Location: IL iTrader: (0)	Autocross on factory run flats? Hi Guys, I did some searching but didn't find anything, so here it is. I'm a new 135i owner. Have a decent amount of AutoX experience with a FD RX7. With the RX7 sold, I'm looking to get some seat time in my 135i. I have the factory run flats on the 135i now and am considering several AutoX events this spring and summer to get a good feel of the car. Has anyone AutoX'd with the factory run flats? With all the issues with the infamous run flats, I'm a little concerned. Thanks! George
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03-22-2011, 10:05 PM	#2
Amalfitano Second Lieutenant 15 Rep 269 Posts Drives: 2009 135i STEP, Future //M2012 Join Date: Jan 2010 Location: Chicago iTrader: (1) Garage List 2009 135i [0.00]	i don't think there's anything to worry about really. The Star Specs were faster once they scrubbed in a bit. The turn-in on the bridgestones was pretty good, but the overall grip wasn't the best, but honestly was better than most oem out there. The grip limit will help get the car where it really wants to be. Slow is fast and all, but REALLY with this car. there's a point of body roll where the car is just a plow. these tires might get you to slow down well enough for some manuevers that a better tire would then really really benefit now.
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03-22-2011, 11:19 PM	#4
bluesunit Second Lieutenant 7 Rep 202 Posts Drives: D-Stock 135i Join Date: Oct 2007 Location: The South iTrader: (3)	Grip isn't half bad, but the RFTs have issues with heat dissipation. I've seen a lot of them (mine included) that start to severely deteriorate after a handful of runs. They begin to shed material like crazy. I'll post some pictures tomorrow.
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03-23-2011, 12:15 AM	#5
TrojanBMW First Lieutenant 18 Rep 308 Posts Drives: Black 135i Join Date: Sep 2007 Location: Los Angeles, CA iTrader: (0)	I ran my first HPDE on the RFTs and had no issues at all, just watch the tire pressures. They won't grip like a good set of non-RFTs, but they should be OK.
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03-23-2011, 02:31 PM	#7
fixation88 Enlisted Member 2 Rep 39 Posts Drives: '08 135i Join Date: Mar 2011 Location: IL iTrader: (0)	Thanks for the great feeback guys! My plan is to run the RFTs to shreds and get a spare set of wheels and tires for the winter. Next Spring, probably some star specs... they are awesome!
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04-16-2011, 01:06 AM	#8
MarkRacerX Private First Class 12 Rep 150 Posts Drives: E92 M3 Join Date: Jun 2010 Location: Spokane,WA iTrader: (2) Garage List 2011 BMW M3 [0.00]	Stock RFT's I just ran my 1st Autocross in my 135i on stock RFT's I just started at 50psi and they did good, no rolling issues at all, They spin easy and you don't even hear any screatching, so not even trying to grip, For stock they are decent, I was surprised I took 1st in DS 1st time racing the 135i 100% stock setup. Fun Car!! __________________ E92 M3
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04-22-2011, 12:32 AM	#11
fboutlaw Cone Cruncher 31 Rep 534 Posts Drives: Dinan 135i Join Date: Apr 2010 Location: Cupertino, CA iTrader: (3)	So it's totally doable. Initial turn in response is really good, but you won't hold any corners. Slow is not fast, it's slow. Use the autox to practice drifting!
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04-23-2011, 03:40 AM	#12
MarkRacerX Private First Class 12 Rep 150 Posts Drives: E92 M3 Join Date: Jun 2010 Location: Spokane,WA iTrader: (2) Garage List 2011 BMW M3 [0.00]	Pics Nice Pics!! The 135i just looks Soo good out on the track being pushed, I have almost same pic of mine turning w/ front tire tucking in wheel well Looks Great !! __________________ E92 M3
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07-11-2014, 11:41 AM	#13
hatepotholez Major 293 Rep 1,015 Posts Drives: M3 Join Date: Mar 2011 Location: NYC, NY iTrader: (1)	Bumping this old thread. Is it better to run stock psi's, 40psi's all around or 50 psi's all around? Last autox event I was on stock psi's.
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07-11-2014, 12:13 PM	#14
Zsanz Private 0 Rep 70 Posts Drives: 135i Join Date: Jan 2014 Location: Haiwood Jablome iTrader: (0)	Chalk the tires, adjust accordingly.
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07-11-2014, 09:25 PM	#16
Ginger_Extract California-bound 385 Rep 1,480 Posts Drives: BMW 135i Join Date: Jan 2013 Location: Los Angeles, CA iTrader: (3)	Nope, they're gonna blow up for sure. People bash the RFT's too much. In terms of performance, they really aren't too much worse than the hot street tires from a few years ago. I autox'd my 1'er when it was showroom stock, and it was fine. However, I get the feeling that they would not take well to aggressive track driving. __________________ Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 \|\|\|\| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17 Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 \|\|\|\| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing \|\|\|\| http://www.youtube.com/user/RaceMeMZ3
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07-17-2014, 09:26 AM	#17
claysones New Member 0 Rep 7 Posts Drives: 135i Join Date: Jul 2014 Location: fl iTrader: (0)	do you guys think run flats wear faster on autoX than normal all season semi performance tires?
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