Shakey car at 70-80MPH?

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griffo20022
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Shakey car at 70-80MPH?

Post by griffo20022 » 24 Oct 2007 10:16 am

Hey guys, I know I know, yet another bloody thread lol! Anyway since having the car at speeds of upto around 70-80mph the car shakes quite badly. Initial though was the wheels need balancing up. I've had all four balanced and it's helped slightly but hasn't got rid of the problem.

I'm currently running on mini revolutions of which the bore diametre is larger than the hub seat for the spigot so ideally I need spigot rings but theres people on here who don't have the seats and just have a flat brake drum face so unless you guys get the same problem I wouldn't have thought it would purely be down to that?

Is there anything else I need to consider it being etc?

Thanks guys :)
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Post by SteveP » 24 Oct 2007 11:04 am

I'd say you've pointed out your problem already - Mini wheels are 4x4" rather than 4x100, can't be helping...
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Post by griffo20022 » 24 Oct 2007 11:46 am

Arrrr right didn't know that, so thats about 101mm 4" isn't it? So even though the difference of 1mm will fit it could throw it out to cause me that problem?
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Post by Ronnie » 24 Oct 2007 01:04 pm

1mm ecentricity at 80 miles per hour is going to add up to some quite scary forces... Personally I wouldn't drive a car with that going on, you're liable to destroy bearings and possibly much worse.
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Post by classicswede » 24 Oct 2007 01:11 pm

If you are runnin low profile 13" tyres than that will probably be more like 60 - 70 MPH actual speed which is the normal point for vibration. Have you jacked the car up and checked all the wheel bearings.

Is the vibration more RPm related rather than speed? Prop out of balance?
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Post by griffo20022 » 24 Oct 2007 02:06 pm

No it's definately in proportion with speed, although it does clear itself up slightly at quicker speeds (have tested on private road :) )

I think i'll check the bearings out this weekend, don't really wanna change my wheels, I like my jaffa cakes :( lol!
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Post by bennett » 24 Oct 2007 08:27 pm

get the wheels balanced
thanks lee
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Post by griffo20022 » 24 Oct 2007 11:17 pm

already have mate
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Post by petefarrell360 » 25 Oct 2007 12:24 am

I'd say as Steve pointed out, you're wheels aren't the correct fitment, I know it's not much, and as Ronnie says, it soon adds up to a lot. I wouldn't be keen running anything that isn't a good fit, or intended at least!

I've recently had my wheels on my van balanced, as when I got it there was some vibration at approx 50 mph and a track rod end was worn out. You will end up like Ronnie says doing wheel bearing etc no good if there is vibration present for long. My wheel ended up being a long way out of balance, and that I believe caused the track rod end to wear out prematurely. It is still causing some vibration though, but at a different speed, so I suspect the rim is actually bent. Do you know the history of the rims and if they've taken any knocks? Also how long is it since the wheels were balanced, as they do settle or wear in sometimes, and need redoing.

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Post by filthyjohn » 25 Oct 2007 02:58 am

whack 4 steelies on and see if that helps?
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Post by griffo20022 » 25 Oct 2007 08:35 am

The wheels were balanced about a month ago now.

I do have some TSW alloys from a VW Golf so I might try the full set of them on, get em balanced and see how they go. If that is the case that those wheels are giving me grief due to incorrect fitment i'll have to sell em I guess. Won't be for a while anyway.

Thanks for the feedback guys!
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Post by Chris_C » 25 Oct 2007 10:29 am

How are you tightening the wheel nuts up? With the wrong pcd the wheels could possibly not even be lying flat, as the angle of the wheel nuts will pull the first hole centre, leaving the last three out, or just not forcing the wheel flat against a hub.

Vibrating quite bad is surely a reason to get something sorted, that "Won't be for a while" scares me. The forces created are relative to speed, and amount the wheel is off centre, tbh if you don't want to get the problem sorted then fair doo's, you can go flying into a hedge when either the bearing locks up do to the force put on it being outside it's mechanical tollerance, or the wheel comes off. Thing is, it'll never be that simple, and some poor sod is going to be driving on the motorway with you. If it's that bad, sell the alloys, and get some steels with the money, or even cheap 400 alloys if steels arnt 'da pimp'
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Post by pettaw » 25 Oct 2007 10:42 am

If you're getting wheel wobble even with balanced wheels, then you've likely either got a tyre out of round or a wheel out of round, or a bearing problem, but bearings give a 'different' sort of rumble.......

It won't help that your wheels don't quite fit the hubs either although I would have thought it would centralise with the bolts :?

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Post by griffo20022 » 25 Oct 2007 11:27 am

Nah I don't care about "pimpness" at all to be honest Chris, so it's all good. To be honest I hear what you guys are saying. I think i'm gonna put the TSW's on as they are a true 4x100 PCD, get them balanced and see if it sorts it. If it does i'll sell the revo's and get something else and in the meantime get some steelies to use as my knockabout wheels :)

It is a problem I completely agree and the only reason I say it'll have to wait is that in my job i'm merely an apprentice so i'm not made of money which is a bummer. I don't say it for the reason I just don't care.

EDIT: Just a quick thought. Can I actually have the wheels PCD measured at all? I don't actually know if they are off a Mini or not, I thought that was part of the name for the wheels. At least then I can determine wether it's down to fitment problems or something else.
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Post by Chris_C » 25 Oct 2007 02:23 pm

Nah, I know mate, I also know what you mean about pennies, I'm still a student ;)

The wheels *should* have the fitment stamped on them, usually under the center caps if they have them. Worth a look, andy also has a point, if wheels are stored upright for a length of time, i.e. not moved, they can go off round.
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