square tire set up and spacers to reduce 335 understeer

n55PR · 08-21-2012, 12:42 PM

I have sports suspension with fixed camber plates upfront. I have -2 camber in the front and -1.8 in the back. I just ordered a set of 4 Kosei K1 17x8.5 with 245s. The K1s have 40mm offset. I will need spacers in the front, from my calculations I need 15mm to avoid rubbing with the front strut.

The square set up is supposed to help reduce the inherent understeer on these cars. Will a wider stance in the front also help with understeer? Should I go with the thickest spacer I can fit in the front? will it make a noticeable difference? This set up is for track only.

CJ421 · 08-23-2012, 10:20 AM

Quote:

Originally Posted by n55PR

Will a wider stance in the front also help with understeer?

Yes and no - the spacers will widen your track (vs. no spacers) so it technically makes a difference but it's too small to be noticed. The wider tires up front will definitely help increase grip up front as will the extra camber, so those were great upgrades on your part.

Ultimately though if you're experiencing understeer - just slow down. Any car will understeer if you enter a corner too fast. As you increase the grip up front (as you are doing), you'll be able to push that limit before the car understeers higher.

Do you have a limited-slip diff? That is a pricey upgrade but helps more than anything on the track, IMO. You can really power out of corners and that will settle the car. The open diff won't allow that.

A $0 tuning tool is tire pressure - you can go with more or less in the front/rear to change how the car grips. It will only do so much and obviously be careful.

n55PR · 08-23-2012, 10:42 AM

thanks, I don't have LSD, not thee yet, but it is in my wish list. I clearly understand your point on entering the corners too hot, and tuning tire pressure. Our track is a killer on tires, particularly the hairpin.

I will probably put 18mm spacer upront (I got them with the wheels) and see how it goes. No spacer in the back. Next step will be a set of 255 tires, a bit more rubber should help.

The HACK · 08-23-2012, 11:28 AM

Trail brake.

n55PR · 08-23-2012, 02:35 PM

practice, practice and more practice

08-21-2012, 12:42 PM	#1
n55PR Private First Class 6 Rep 132 Posts Drives: 335i M-sport e90 Join Date: Jun 2012 Location: Puerto Rico iTrader: (2)	square tire set up and spacers to reduce 335 understeer I have sports suspension with fixed camber plates upfront. I have -2 camber in the front and -1.8 in the back. I just ordered a set of 4 Kosei K1 17x8.5 with 245s. The K1s have 40mm offset. I will need spacers in the front, from my calculations I need 15mm to avoid rubbing with the front strut. The square set up is supposed to help reduce the inherent understeer on these cars. Will a wider stance in the front also help with understeer? Should I go with the thickest spacer I can fit in the front? will it make a noticeable difference? This set up is for track only. __________________ 2011 e90 N55 (now 100% stock) & e36 2.8L SCCA ITR race car Last edited by n55PR; 08-21-2012 at 12:48 PM..
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08-23-2012, 10:42 AM	#3
n55PR Private First Class 6 Rep 132 Posts Drives: 335i M-sport e90 Join Date: Jun 2012 Location: Puerto Rico iTrader: (2)	thanks, I don't have LSD, not thee yet, but it is in my wish list. I clearly understand your point on entering the corners too hot, and tuning tire pressure. Our track is a killer on tires, particularly the hairpin. I will probably put 18mm spacer upront (I got them with the wheels) and see how it goes. No spacer in the back. Next step will be a set of 255 tires, a bit more rubber should help. __________________ 2011 e90 N55 (now 100% stock) & e36 2.8L SCCA ITR race car
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08-23-2012, 11:28 AM	#4
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	Trail brake. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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08-23-2012, 02:35 PM	#5
n55PR Private First Class 6 Rep 132 Posts Drives: 335i M-sport e90 Join Date: Jun 2012 Location: Puerto Rico iTrader: (2)	practice, practice and more practice __________________ 2011 e90 N55 (now 100% stock) & e36 2.8L SCCA ITR race car
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