Mazda Rotary Club

General => General Technical => Topic started by: crispyj on October 20, 2005, 08:23:52 PM

Title: Car Rear Lifting At Speed
Post by: crispyj on October 20, 2005, 08:23:52 PM
I Have Bought A Gen 3 And The Rear Spoiler Is Missing , The Car Feels Back End Twitchy At Speed.  Is This Due To The Spoiler Missing Causing Downforce Issues.

Thanks  Crispyj
Title: Car Rear Lifting At Speed
Post by: Gman on October 20, 2005, 09:17:02 PM
I wouldn\'t have thought so unless you are driving above 130mph.
Title: Car Rear Lifting At Speed
Post by: antnicuk on October 20, 2005, 09:20:59 PM
unlikely,  more likely due to the bushes being worn out.
Title: Car Rear Lifting At Speed
Post by: iaint on October 20, 2005, 09:42:07 PM
Dead dampers at the rear will also exhibit this kind of feeling - very unsteady, worse the quicker you go.

Replaced mine and it made the world of difference.
Title: Car Rear Lifting At Speed
Post by: B9 KLF on October 20, 2005, 11:17:57 PM
Low tread on the back tyres can also be a cause. Or deflate the rears a little.

Keith
Title: Car Rear Lifting At Speed
Post by: clive on October 21, 2005, 08:07:35 AM
These cars should drive arrow straight at VERY high speeds, like you were doing 50mph in yer Fiesta.

Have a good shake around the suspension and then get a four wheel geometry check done, also in the long run it will pay for itself by increasing tyre wear.

If its still doing it after the above, put a spoiler back on as god intended
Title: Car Rear Lifting At Speed
Post by: Donato on October 21, 2005, 08:35:54 AM
Has it been lowered? Could be the back lower than the front causing lift...
Title: Car Rear Lifting At Speed
Post by: Initial-D on October 21, 2005, 10:38:24 AM
Laser alignment will help alot, they\'d also be able to check for worn bushes and suspension probs. Of course I\'d recommend a HUGE rear GT wing owning one myself!
Title: Car Rear Lifting At Speed
Post by: crispyj on October 21, 2005, 12:39:36 PM
It is lowered with Apexi adjustables all round.  The tyres are new size  265/40/17 on the rear  235/45/17 on the front.  I will get it allignment checked on tuesday.

Thanks
Title: Car Rear Lifting At Speed
Post by: Sy. on October 21, 2005, 03:45:54 PM
spoiler will make no difference .. as i had a gt spoiler and did 140 mph (on privet road) and took if off and did 152mph and no difference in stickability.
Title: Car Rear Lifting At Speed
Post by: Martiny on October 21, 2005, 05:23:43 PM
Yep, mostly aesthetic .
Title: Car Rear Lifting At Speed
Post by: B9 KLF on October 21, 2005, 10:15:39 PM
I had this problem after new Koni shocks were fitted and the mix of tyres was different front to back.

Went to Elite in Essex for 4 wheel laser alignment and boy what a difference.

Keith