gmoney

Ok so I finally lowered the 8 on Tein S springs and put the 19s on but now I notice after driving for a couple min after start up my traction light comes on. Is there a part on the suspension that would trigger it to go on?

StealthTL

iTrader: (1)

When you put the new wheels on, did you check the tire pressures?

As little as 5 psi can cause enough difference in rotational speed to trip a light.....

gmoney

Ok, my 8 is getting painted Monday so I swapped back to the stock rims, went backwards about 10ft then forward but this time no traction control light came on just the low tire pressure my rear driver side tire is low. Why would the 19s trigger anything?

Bladecutter

Check your tire sizes to make sure they match each other properly.

If the sizes are wrong, the ecu will see that one or more tires are running at different speeds than the others, and that will make the traction control system very unhappy.

BC.

gmoney

That's a good idea I'll go check real quick......

gmoney

Well I check and both rear tires are the same and both fronts match as well, so tomorrow I'm gonna do some more driving around to see if it comes on again.

YaXMaN

what size tires do you have front & rear, and what brand & model are they?
make sure to include not just the width, but the profile as well.

gmoney

My front are 19x8.5 (245/35/19) the rear 19x10 (275/30/19) Hankook ventus v12.....

gmoney

Would the alignment have anything to do with it?

StealthTL

iTrader: (1)

My front are 19x8.5 (245/35/19) the rear 19x10 (275/30/19)

There's your sign...

monchie

I don't think so.

Anyway, you may have a defective sensor or two, that's why its triggering the light.

gmoney

Wrong tire size?????

jasonrxeight

shouldnt be, both sizes are very close. is there a code?

YaXMaN

I'm getting the specifications from the tirerack site located here
http://www.tirerack.com/tires/tires....s+V12+evo+K110

click on the "Specs" tab

245/35/19 revolutions per mile spec is 806, overall diameter of 25.8"
275/30/19 revolutions per mile spec is 813, overall diameter of 25.6"

A 285/30/19 in that tire would have been a perfect match to the 245/35/19. Or, if you had gone with a 235/35/19 in the front and kept the 275's out back, you would have been much closer.

Maybe some of the RX8 owners with aftermarket staggered setups can speak to whether or not the revs per mile are different enough to trip the traction control light, but that might be what's happening. The TCS freaks out if it's not reading the same revs/time for every wheel, and shuts it off.

michael Dombrowski

iTrader: (2)

I have the exact size staggered setup on my car and don't have any issues. I even have Dunlop on the front and Achilles on the back! No issues I also run 37 psi rear 33 front. Only problem I have is too much grip ..hehe

YaXMaN

To the OP... yah, you should try this guy's suggested tire pressure on your setup.

Tires don't have exactly the same specs, but 33 psi front and 37 psi rear could make up just enough for the difference in diameter.

godesshunter

I wrote this up few months ago when I was toying with the idea of staggered fitment check it out.

From what I wrote for option 2 you should change your front tire size. That will allow you to keep your rears. the fronts are probably cheaper to replace to make correct than the rears.

https://www.rx8club.com/series-ii-wheels-tires-brakes-suspension-165/19-staggered-fitment-guide-224543/

YaXMaN

Just know that tires from different manufacturers and tires of different models have variances in diameter and width, even if the "so-called" tire size is the same.

Your 1% number can't be applied against general specs - you have to be looking at the exact tire's brand/model specification.

Also, the revolutions per mile measurement, if available, has higher precision.

godesshunter

If you want to get real technical Ive seen tires of the same brand and model of different sizes made in entirely different countries by different machines. The tolerances aren't as exact as you might think.

But yes I always match tire brand and had assumed he would as well.

YaXMaN

Makes sense... I was just concerned that this guy was going to make a decision to buy other tires without getting the "closest" numbers he could.

Every car is different as well, and maybe his little dash light gets cranky about the variance more than others.