Going From 19" Back To Stock 18", Slip Light Comes On?

[sethaiyaar]

Hi guys,

Here is an interesting one. I had the original spec wheels 225/45/18 & 245/45/18 on the before I upgraded them to a 19inch set-up (245/35/19 & 275/35/19). Recently I got a small cosmetic bend on the outer lip of the 19s and decided to put back my stock wheels.

Stock wheels go back on, and the traction control doesn't let the car accelerate and the SLIP light comes on. Car wont go more then 60-ish no matter how much the throttle is pressed. If I turn the traction control OFF, it is OK but I wasn't totally satisfied and went back to the 19s.

Any ideas on why this is happening and how to rectify it?

p.s. I had no issues when going to the 19inch wheels.

[V35_Paul]

I've heard something like this before.

Check the common problems thread... Maybe

[sethaiyaar]

Nothing in that section, not having much luck searching in the forum either.

[sonicii]

are you sure you put the 245s on the rear and not the front?

I swapped my wheels front/back to check if there were any clearance problems with 245 tyres on the front of my sedan and the VDC went nuts.

[Nightcrawler]

How long did you drive around with them on for? A couple of times what I have changed tyres size/profile dramatically and the it takes the VDC system 20 mins or so to learn, then it just turns the lights off and is all ok again.

[sethaiyaar]

are you sure you put the 245s on the rear and not the front?

I swapped my wheels front/back to check if there were any clearance problems with 245 tyres on the front of my sedan and the VDC went nuts.

Yeh I thought about that but I'm 100% sure they were on the correct ends.

How long did you drive around with them on for? A couple of times what I have changed tyres size/profile dramatically and the it takes the VDC system 20 mins or so to learn, then it just turns the lights off and is all ok again.

Actually not long at all, maybe only 2-3 mins then back into the shop to get them changed back. How did you drive 20mins? It hardly let me accelerate?.....It seemed ok when I turned it off (VDC).

[V35_Paul]

How long did you drive around with them on for? A couple of times what I have changed tyres size/profile dramatically and the it takes the VDC system 20 mins or so to learn, then it just turns the lights off and is all ok again.

Yeah I heard something like that.

Yeah and a fewpeople have a problem when putting the car on the dino and it take a while for the car to set itself right again. Holding the VDC down for 10 sec might help.

[nickcorr]

Hi guys,

Here is an interesting one. I had the original spec wheels 225/45/18 & 245/45/18 on the before I upgraded them to a 19inch set-up (245/35/19 & 275/35/19). Recently I got a small cosmetic bend on the outer lip of the 19s and decided to put back my stock wheels.

Stock wheels go back on, and the traction control doesn't let the car accelerate and the SLIP light comes on. Car wont go more then 60-ish no matter how much the throttle is pressed. If I turn the traction control OFF, it is OK but I wasn't totally satisfied and went back to the 19s.

Any ideas on why this is happening and how to rectify it?

p.s. I had no issues when going to the 19inch wheels.

I think I know what the issue is...

You do not have the stock 18" tyre sizes fitted...

Standard 18" tyres are 225/50/18, not 225/45/18 on the front. With both ends being 45 profile on your car, there is a 3% difference between the front and rear wheels rotational speed and I belive that this is enough to trip the traction and stability control systems.

The fix would be to fit the correct 225/50/18 tyres on the front, or do what I did, and fit the same 245/45/18 tyres on the front rims. They do fit fine.

[Nightcrawler]

^^ Nah I had vastly different width wheels, tyres and type profile/rolling diameters from the rear for years - like I said previously, all you have to do is drive for 10-20mins or so and let the ECU figure out what is going on, and it all goes back to normal.

[sonicii]

I think I know what the issue is...

You do not have the stock 18" tyre sizes fitted...

Standard 18" tyres are 225/50/18, not 225/45/18 on the front. With both ends being 45 profile on your car, there is a 3% difference between the front and rear wheels rotational speed and I belive that this is enough to trip the traction and stability control systems.

The fix would be to fit the correct 225/50/18 tyres on the front, or do what I did, and fit the same 245/45/18 tyres on the front rims. They do fit fine.

The stock sizes are 225/45/18 front and 245/45/18 rear. Even the tyre placard on mine shows this.

Same with the 19s. stock sizes are 225/40/19 front and 245/40/19 rear.

They are a staggered setup.. I think the 350Z might be the same??

Edited February 13, 2015 by sonicii

[nickcorr]

Ah sorry, my bad, I thought V36...

I guess the V35 has more robust handling of the diffrence in the wheel speed front to rear... I have seen this issue before with the V36s and it was the difference in tyre size that screwed the VDC system up..

[sethaiyaar]

Hi Guys,

Yep I just turned off the VDC for about 10-15 mins and then turned it back on. Everything was fine after that.

Thanks for the help!