cant get tracion, what is everyone PSI with a tune?

5soko · 08-15-2008, 02:56 PM

well i thought i could live with it but sometimes i cant.
i have the stock 255 rear sport package RFT. in 75*-90* weather i cant get trraction

i have a bmw mech. psi gauge that i check my tires with, the doorjamb says 34-35psi for the rear tires, but i went down to about 32 psi and it got a bit better.

what are you guys running? should i go down to 30 psi?

the only way i can even get of the hole fast is using DTC.

lawdude · 08-15-2008, 04:19 PM

I don't think lowering air pressure in stock RFT will help with launch.

darkphantom · 08-15-2008, 04:30 PM

DTC = good launch.....no DTC/DSC = lots of smoke lol...

maui86 · 08-15-2008, 04:40 PM

if you have a manual, launch at a lower rpm and play with the clutch slightly. if you move several feet at a steady pace before going all out, you should do fairly well...i have the non-sport 225x17s and fair not too bad, of course, could be better. i can launch way better without the traction control off.

maui86 · 08-15-2008, 04:41 PM

oh and my tire pressure is 36psi.

Dan335i · 08-15-2008, 07:56 PM

Lowering the pressure wont do anything except make the car handle worse.Stock rft wont hook up if you let the air out to any pressure.You have to work on a quick slip, and use the throttle to control the tire spin.

sflgator · 08-15-2008, 08:00 PM

Get new tires; non-RFTs.

If not, then at least push the DTC button 1 quick time to turn DTC on; no button press and it's on "auto" mode where DTC will kick in quicker when it detects wheel spin...but you'll have lots of wheel spin.

DTC "on" will turn DTC on, but raise the threshold for intervention, and your launches will be better. btw - your tire psi is fine .

5soko · 08-16-2008, 03:15 PM

so should i keep it where it is, lower it or just leave it to the stock specs?

i didnt know that lowering the RFT tire pressure didnt do nothing, that is a first.

08-15-2008, 02:56 PM	#1
5soko Brigadier General 350 Rep 4,633 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	cant get tracion, what is everyone PSI with a tune? well i thought i could live with it but sometimes i cant. i have the stock 255 rear sport package RFT. in 75-90 weather i cant get trraction i have a bmw mech. psi gauge that i check my tires with, the doorjamb says 34-35psi for the rear tires, but i went down to about 32 psi and it got a bit better. what are you guys running? should i go down to 30 psi? the only way i can even get of the hole fast is using DTC.
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08-15-2008, 04:19 PM	#2
lawdude Colonel 95 Rep 2,339 Posts Drives: 335i ZPP ZSP TiAg MT Join Date: Jul 2006 Location: Georgia iTrader: (1)	I don't think lowering air pressure in stock RFT will help with launch. __________________ What do I know? I'm insane.
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08-15-2008, 04:30 PM	#3
darkphantom Banned 625 Rep 5,945 Posts Drives: E93 335i Join Date: Aug 2007 Location: The place for Bimmers iTrader: (4)	DTC = good launch.....no DTC/DSC = lots of smoke lol...
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08-15-2008, 04:40 PM	#4
maui86 Captain 38 Rep 738 Posts Drives: 07 335i Join Date: Nov 2007 Location: paradise iTrader: (1)	if you have a manual, launch at a lower rpm and play with the clutch slightly. if you move several feet at a steady pace before going all out, you should do fairly well...i have the non-sport 225x17s and fair not too bad, of course, could be better. i can launch way better without the traction control off. __________________ http://videos.streetfire.net/video/s...rays_37268.htm gotta do what i gotta do to get them donuts 04 spec-v: rip dec07
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08-15-2008, 04:41 PM	#5
maui86 Captain 38 Rep 738 Posts Drives: 07 335i Join Date: Nov 2007 Location: paradise iTrader: (1)	oh and my tire pressure is 36psi. __________________ http://videos.streetfire.net/video/s...rays_37268.htm gotta do what i gotta do to get them donuts 04 spec-v: rip dec07
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08-15-2008, 07:56 PM	#6
Dan335i Lieutenant Colonel 33 Rep 1,786 Posts Drives: 07 335i coupe 6MT,w/sp. pack. Join Date: Oct 2007 Location: orange county NY iTrader: (2)	Lowering the pressure wont do anything except make the car handle worse.Stock rft wont hook up if you let the air out to any pressure.You have to work on a quick slip, and use the throttle to control the tire spin.
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08-15-2008, 08:00 PM	#7
sflgator Major General 166 Rep 5,389 Posts Drives: '09 MB C63 AMG & '08 MB GL450 Join Date: Oct 2006 Location: U.S. iTrader: (1)	Get new tires; non-RFTs. If not, then at least push the DTC button 1 quick time to turn DTC on; no button press and it's on "auto" mode where DTC will kick in quicker when it detects wheel spin...but you'll have lots of wheel spin. DTC "on" will turn DTC on, but raise the threshold for intervention, and your launches will be better. btw - your tire psi is fine . __________________ \|2009 RENNtech MB C63 AMG \| Black/Black Leather/Black Maple \| Premium II \| MultiMedia \| iPod \| \| TeleAid \| Charcoal Filter Delete \| BMC High-Flow Air Filters \| High-Flow Secondary Cats \| Clear Side Markers \|
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08-16-2008, 03:15 PM	#8
5soko Brigadier General 350 Rep 4,633 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	so should i keep it where it is, lower it or just leave it to the stock specs? i didnt know that lowering the RFT tire pressure didnt do nothing, that is a first.
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