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lowered shake

 
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Old 12-01-2014, 06:30 PM
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lowered shake

quick question, bought a 93 prelude, that was lowered by previous owner using just springs, approx 1.5" lower than stock, i removed those springs, and replaced with a set of coil overs, which dropped it down another inch or so. the issue im having is since i put the coil overs on, i have a distinct shake in the front end, but only when accelerating, most noticeable in 2nd gear. any suggestions on what to check would b greatly appreciated. the shake was not there prior to the spring swap
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Old 12-01-2014, 08:16 PM
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Re: lowered shake

I assume you adjusted the toe-in of both the front and rear wheels after lowering. If you didn't you could be seriously misaligned, especially in the front.

Most people take their car in for alignment but we have been aligning our races cars, and street cars ourselves for years. We have plates (commercially available) that we hold on to the outside of each wheel with slots in each end of each plate that we hang identical tape measures in. You compare the front distance to the rear and adjust the toe accordingly. Mind which wheel you move with relation to the steering wheel position so it doesn't get to far off center. If you don't have the plates you can measure between two common slots or marks on the tire in the front and back. After you make an adjustment you have to roll the car back and forth to free any twist in the tire before measuring again. Also when you do the rears it is more difficult because you are aligning each tire to the car not just to each other since they are stationary.

If you don't want to adjust it yourself you could at least measure it to see how far it's off before you pay a shop to align it.
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Old 12-01-2014, 08:24 PM
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Re: lowered shake

Did you get a wheel alignment after putting the new coilovers in? Dropping another inch will throw everything out. Do you have aftermarket wheels? If so are you running hub adaptors? If the wheel nuts aren't torqued correctly this can cause a shimmy too.

Give this thread a read too for ideas ALL the reasons WHY your wheels vibrate...

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Old 12-01-2014, 09:09 PM
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Re: lowered shake

yes i had all that done, wats throwing me off is the fact that its only when accelerating, if im not on the gas, its fine, at any speed
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Old 12-01-2014, 10:13 PM
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Re: lowered shake

One or both your axles are bad, possible due to over lowering.
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Old 12-01-2014, 11:36 PM
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Re: lowered shake

There is also......


















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Old 12-02-2014, 01:10 AM
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Re: lowered shake

Haha static, we're not helping.

It could indeed be the axles, if they were going bad before lowering it then the drop could be making it worse. Try moving with the steering at full lock (at low speed) in both directions, is there an audible clicking noise and/or a clunking in the steering wheel?

The steering rack could be having problems for the same reasons. You can jack the car up, hold the front wheels at the 3 and 9 position and give it a wiggle. Any movement and it's likely the steering rack. While you're there give it a wiggle at 12 and 6, this will tell you if it's the wheel bearings.

BTW, since when is a 2.5" drop TOO low? Sounds about right to me.
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Old 12-02-2014, 02:26 PM
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Re: lowered shake

well what has me confused is it started as soon as i drove it directly after lowering, both front wheels are tight when wiggled at 3/9 position, and no clunking when i turn the wheel. it just seems very bizarre that its most noticeable in 2nd gear, 1st its not there at all, 3rd, very little, 4th, gone again

Last edited by prelude93_vtech; 12-02-2014 at 03:27 PM.
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Old 12-02-2014, 02:27 PM
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Re: lowered shake

im gonna go do some high speed tests, see if it has any other characteristics i can add to help figure this out
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Old 12-02-2014, 04:18 PM
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Re: lowered shake

Take note the speed it occurs.
You say only happens when accelerating, right?
Is your half shaft tight to the block?

Did you get all your joints back to spec tight?
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Old 12-04-2014, 12:01 AM
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Re: lowered shake

If the inner joint is bad it will not click when turning as the inner joint only flexes with suspension travel. Thus why when you lowered the car it got worse, the inner joint is at the incorrect angle.
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