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88GT bump steer and excess road feel by notaguru
Started on: 04-29-2014 11:43 AM
Replies: 7 (148 views)
Last post by: Csjag on 04-29-2014 04:45 PM
notaguru
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Report this Post04-29-2014 11:43 AM Click Here to See the Profile for notaguruClick Here to visit notaguru's HomePageClick Here to Email notaguruSend a Private Message to notaguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
This '88GT is a recovery project - only 40k miles, but many years stored in the sun. It finally runs fine, but has so much road feedback and bump steer that it is uncomfortable. I know the redesigned '88 suspension doesn't include a steering damper, but something seems to be wrong.

What is the likeliest source of the feedback problem?

On another post someone mentioned a Rodney Dickman kit for the '88, but I did not find it on his website. It would be easy to fabricate brackets to fit a damper from another car.

???
Thanks!
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Gall757
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Report this Post04-29-2014 11:53 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
No need for a damper on an 88! The first thing to worry about is alignment. The 88 suspension will track like a go-kart with a good alignment....and the alignment specs are for the 88 only, so if somebody was sloppy or just did it like any Fiero it is wrong, and you will notice it while driving. The second thing to worry about is tires. Old tires get hard, and some new tires are too hard. Avoid tires with a high mileage warranty. The only way that happens is with a hard compound rubber. Get the softest tires you can find. The rest of it is the usual maintenance stuff like bushings, shocks and struts, and you will be very happy with the handling with no added components.
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Report this Post04-29-2014 12:47 PM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
Stock wheels? A farther out offset will cause road feedback. But alignment is another.
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notaguru
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Report this Post04-29-2014 12:53 PM Click Here to See the Profile for notaguruClick Here to visit notaguru's HomePageClick Here to Email notaguruSend a Private Message to notaguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
Excellent - thanks!
It's good to know that the potential for that front suspension is very high. I'll work on it.

The tires are about 16 years old, and most of that time the car was stored in the sun. Tread is good, but perhaps they just need replacing. This week it will get new shocks/struts and - in the rear - urethane bushings, and then will get a good alignment.

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fieroguru
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Report this Post04-29-2014 01:09 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
I would check all the bushings front/rear and all suspension bolts for proper torque. Then get it aligned (using the 88 specific alignment specs). The upper a-arm might have slipped and caused a severe toe out condition which will make the front end very darty.

The other common issue with the 88 suspension is in the rear where the long bolt that connects the lateral links to the uprights becomes loose and allows the rear wheels to "turn" in an out slightly.
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Gall757
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Report this Post04-29-2014 01:33 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by notaguru:
Tread is good, but perhaps they just need replacing.


At that age they not only need replacing, They are a safety hazard.
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Blacktree
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Report this Post04-29-2014 03:31 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post
The chassis may only have 40k miles on it, but the car is still 26 years old. And 26 year old parts can deteriorate, even when not in use. Take a good look at the existing parts and see what's going bad. Because if an '88 Fiero suspension is suffering from bump-steer and poor handling, something is definitely going bad.

The first thing to check would be the tires. If the rubber is starting to dry-rot, the tires need to be replaced. And if the air pressure is low, it can degrade the handling.

Next thing to check is the shock absorbers. Worn out shocks will degrade handling. While you're at it, you might as well jack up the front end and do the "wiggle test" on the front wheels. Grab the wheel at the 3 o'clock and 9 o'clock position, and try to wiggle it side to side. Then grab the wheel at the 6 o'clock and 12 o'clock positions, and try to wiggle it up and down.

Also, after checking the above, have the alignment checked.

Best of luck.
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Csjag
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Report this Post04-29-2014 04:45 PM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
I was amazed at the difference new tires, new front shocks and new motor and transmission mounts made on my 85
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