Ghostflames

I replaced my stock 16" wheels with staggered C5 vette wheels 17" front & 18" on rear with 215/45/17 on the front & 225/50/18 now anytime I hit 50mph my ABS Inop & brake light comes on at the same time. When I shut the car down the lights stay off till I hit 50mph again then they return.. Can someone help me with this issue? What do I need to do to keep the lights off?

LilJayV10

iTrader: (39)

My guess is at higher speed there is a difference in your wheel speed sensors that is kicking the ABS light.

The height of the two tires are similar,; 215/45/17 is 24.62in and the 225/50/18 is 24.20in

However revolutions per mile are very different. the 215/45/17 is doing 819 revolutions per miles and the 225/50/18 is doing 751 revolutions per mile. Not knowing what your stock tire size was I can't determine it's revolutions per mile.

The height is the same the radius is different. Even though the vehicle is traveling at a constant speed, because the radius is different one wheel is actually spinning faster to keep up with other wheel.

The PCM allows a variance in the speed sensors before it thinks something is wrong. My guess is above 50mph the variance is greater causing the ABS light to come on. Also the PCM is using a strategy based off of the stock wheel size.

This is my guess at least.

I think even most hand held tuners will let you change your tire size.

mikh338

iTrader: (16)

its because you are running diff size tires in the front and rear and it throws the abs system off

Ghostflames

my stock tires were 225/55/16... So I can use a tuner to change my tire size? do you know just what tuner I would be able to do this with or can I take it somewhere to have it done?

mrstepheneades

Yeah its tire size issue. I had same issue on previous car. Had z06 wheels 18s rear 17s front. Just had tuner correct it. It wasnt a big deal

DeLaRosa25

iTrader: (10)

215's..holy thats a small tire! I think my 94 V6 came with 215's from factory

Ghostflames

When you had it tuned did you do it yourself or take it somewhere? & if you took it somewhere what did they charge to do it?

TheSilverOne

iTrader: (22)

get the real size tires

Ghostflames

Excuse me Mr. TheSilverOne, 225/50/17's will rub my front fenders with my wheels. & BTW I have the stock wheels & tires that I use for winter driving. And seeing how there is no such thing as a 220/50/17 I think I'll have to deal with the 215/45/17 issue. I wasn't asking for smartass remarks I was asking for a little input on an issue that does not concern you or your input..

DemonicZ

what size wheels are those 17X? 18X?