Bad steering wobble

[Ian]

Still got this problem.

I thought it could be because the wheels are being held off the hub by the taper very slightly however the guy I use to do some of the more advanced work I can't so myself disagrees, he think the wheel is mating flat with the hub, I don't agree though.

Anyhow, I'm thinking of trying a new set of hubs to see if its the hubs thats the issue.



What are peoples opinions on Alloy hubs?

https://technotoytuning.com/nissan/260z/4-lug-front-hubs-datsun-260z-and-280z


If I get a second hand pair of stock hubs then its not guaranteed that everything will be 100% whereas alloy one are brand new so there shouldn't be any issues, I'd imagine they will also weight a fair bit less.

Other than cost are there any downsides.

 

[Ian]

So it seems that the 260Z/280Z hubs are 73mm and my wheels have 73mm bore.

So its quite possible that its only off very slightly, would this be enough to cause wobble?



In my mind they are not mating to the hub correctly.If I hold the wheel and push it onto the hub and push evenly its possible to wobble the wheel slightly, surely the wheels should be more solid if being pushed onto the hub face? Also if you look at the wheel where bore makes contact with the hub taper its slightly damaged, as like its been rubbing metal on metal.

So assuming I am correct and the mechanic is wrong, what should I do? Machine 1mm off the rim or 1mm of the hub? I'd think 1mm should be enough.

 

[pmac]

How much disc run out do you have??

 

[Albrecht]

In my mind they are not mating to the hub correctly.If I hold the wheel and push it onto the hub and push evenly its possible to wobble the wheel slightly, surely the wheels should be more solid if being pushed onto the hub face? Also if you look at the wheel where bore makes contact with the hub taper its slightly damaged, as like its been rubbing metal on metal.

^Surely this has to be the answer? If your wheels are even partially contacting the taper of the hub centre casting then they won't sit on the hub face properly.

If it were me I'd modify the wheel centres. There must be plenty of scope for it. But a cheap 'test' would be to buy some thin shim-type universal wheel spacers (making sure that they have centre bores that clear the hub centre properly) and see if they make your wheel wobble go away. Worth a try I'd have thought...

 

[Ian]

How much disc run out do you have??

Limited, the discs were skimmed. Having said that theres still a part that rubs slightly when you spin the wheel, but it can't be that bad or I'd feel it through the brakes. If I could find someone that can turn the discs while fitted to the car I guess that would get rid of this completely, but thats not so easy around here.

^Surely this has to be the answer? If your wheels are even partially contacting the taper of the hub centre casting then they won't sit on the hub face properly.

If it were me I'd modify the wheel centres. There must be plenty of scope for it. But a cheap 'test' would be to buy some thin shim-type universal wheel spacers (making sure that they have centre bores that clear the hub centre properly) and see if they make your wheel wobble go away. Worth a try I'd have thought...

I would think the only way to modify the wheel centre is by machining? Anything else would be too uneven/inaccurate?


I ran the car with 10mm spacers on the front, problem was still there, I put this down to the spacers being too big and the wheel not centring 100%. I could always try a 2 or 3mm spacer, if the problem is still there then I guess its probably related to something else.

 

[johnymd]

Just to bring up the problem I had with my Rota wheels. The hole in these wheels is smaller than the largest part of the tapper on the hub. Therefore its held away from the mating surface by a very small amount. This was enough to cause bad wheel wobble. The tapper on the zed hubs is not a machined surface so you should make sure this doesn't touch the wheel or it will push the wheel off center. you could either run spacers or grind a small chamfer on the inside of the center hole on the wheel. You must remember to have the wheels balanced with a cone on the front of the wheel unless you have the chamfer machined and true to the wheel. Hope this makes sense. Or you could get the hub machined to use spigot rings.

 

[datsfun]

Why not try another set of wheels that may "fit" better \ properly? Just borrow as set from a friendly fellow zedder. Or am I missing the point?

 

[Ian]

I think if I have the wheels chamfered I will try and get it machined properly if possible so they are true. I'll try a 3mm spacer the next time I have the car out next and see if this cures it.

Why not try another set of wheels that may "fit" better \ properly? Just borrow as set from a friendly fellow zedder. Or am I missing the point?

Only a couple of Z's in NI and are likely all running 15" or smaller wheels, I can't run smaller than 16's.

 

[datsfun]

Only a couple of Z's in NI and are likely all running 15" or smaller wheels, I can't run smaller than 16's.

Surely anything in 16" + and with 4x114.3PCD will do so long as they don't have weak FWD offsets? Primera's, s13's, toyota's etc...plenty to chose from rather than just look at zed's?

 

[zNathan]

I had this issue with my Rota's Ian - machine the inner edge on your front rims and you'll be good.

Should look something like this:

 

[Ian]

Surely anything in 16" + and with 4x114.3PCD will do so long as they don't have weak FWD offsets? Primera's, s13's, toyota's etc...plenty to chose from rather than just look at zed's?

You are correct, however a lot of wheels have a smaller centre than the +73mm I need.

Worth a search though.




Nathan - Thanks for the photo, I'll arrange to get that done.

Did you have some wobble before they were machined then? Even though they did look to almost fit?

 

[zNathan]

I had wobble yeah - it was because of the where the hub smooths out into the flat surface (can't find the words to explain well enough). The inner edge would just catch on the curved section so it would seem like it was on properly, however it actually wasn't.

See below picture, will probably explain better than I can with words lol