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Discussion Starter #1
So once again I need a LF hub for my 89 ITB MR2. Apparently they are no longer available thru Toyota. Just dried up! Apparently the Chinese supplier requires 500 pieces to produce. So does anyone have a reliable supplier for 1st gen hubs & bearings? Toyota part number is 43502-17010.
PLEASE HELP! :dontknow:
AJ
 

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Any racer that uses the Mk1 as weapon of choice need some, either factory or custom at this point. Check out www.toyotapartszone.com for some oem parts. Some stronger custom hubs would be the ticket as the oem Front Hubs will fail again, it's just a matter of time.

John
 

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Discussion Starter #5
Yeah John, we tried all those normal suppliers as well. Found out that the rear hub on an FX 16 or Corolla is apparently the same part, so we will be investigating that option. That would also explain those damn holes thru the hub. Access. Will report back.
 

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hmm....if the rear hub on an FX 16 or Corolla is the same, then I can't help but wonder why Toyota wouldn't simply cross-reference the number, instead of saying they're NLA for MK1s
 

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Discussion Starter #7
Same reason Toyota has drilled quarter sized holes thru the fronts for 26 years. Left hand doesn't know what the right hand is doing. :dontknow:

I'm not saying it's a fact that the parts are the same, but there is some reliable evidence online that they are and the part has been ordered. Assuming the part is available, we'll find out in a few days and I'll let y'all know what happens.
 

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Discussion Starter #9
Update

Corolla/FX16 parts came in. So even though the part numbers are the same for the front hub on the MR2 and the rear hub on the Corolla/FX16, they are not the same part, and it still has the access holes. The "hat" that the lugs go thru is wider on the Corolla than the MR2, so the front rotor on the MR2 does not fit over the hub. The SCCA GCR p. 430, shows 2 different specs for the rotors on the ITB MR2. Anyone have some insight into this? Only thing I can figure is that the bigger ones would be for the supercharged model, but according to the CGR that would be legal. No idea what that would mean to the calipers and brake pads. That still doesn't address the problem of replacement hubs, but we're still researching.
AJ
 

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GCR Brake sizes

The only thing I know is: some early (85) stuff is different. My old Firehawk car had smaller brakes both ends, as well as smaller dia. clutch disk than those on my 86 and later NA cars. Also, know my early axles don't fit the later rear hubs on the race car... So, imagine that there was some changes in production parts earlier than SC cars intro. in 88 and 89. (Saw the same on the window switches, heater controls, etc... had very early, first MR2 in town, bought a total with 800 miles for spares right afterwards....)

Bob L.
 

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Discussion Starter #12
Looking pretty grim. According to reliable sources, Toyota has canceled production of the front hubs, God knows why. I've tried everything I can think of and called I don't know how many suppliers, and several mechanics have done the same. Dead ends.
So, If anyone has a supplier or has an idea, please post it here. We found a
Chinese manufacturer which requires 500 pieces to order a run. I found another foreign manufacturer website which was not in English, but showed the part, so I emailed them anyway. Probably won't hear from them.
My next step is to contact Toyota USA, which will probably go nowhere. It may take a mass call in effort for them to realize we have a problem.
AJ
 

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why not just turn down those FX16 rear hubs? (if they are indeed the same otherwise). Can't be a big deal for any semi-competant machine shop

Can you measure their diameter?
 

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what a pain! I am curious to a specific as to why the hub itself is going bad...Unless a bearing blew out and causes damage to the hub? tommyg is right, if the hub is similar, any good machinist can make do, or you could use mk2 hubs machined into the mk1 bearing assembly and have five lug hubs as a worst case? curious to what you guys come up with... even used spares are getting hard to come by.
 

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Discussion Starter #15
Long story, but basically the hub hat, which has the lugs thru it, sepearates from the hub assembly. The weakness is mostly the large access holes which are drilled thru the hat, so the stresses of sharp right hand turns causes the evetual failure of the LF hub. The RF goes every once in a blue moon, but the LF takes the most abuse. The problem with machining the larger hats from the Corolla is again the access holes. I haven't actually seen them but my mechanic says there's not enough meat on there to machine without getting into the same problem. Peter Doane posted up a couple photos of the issue a while back, so maybe he'll put them up again if he reads this discussion.
Still hunting down alternatives. Even exchanging emails with some manufacturer in Russia... :shakeshea
AJ
 

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I have only had one fail (over 20+yrs), and that was possibly a result of abuse (broken brake duct, overheated/failed bearing, etc.). The hub broke.

Consequently, every 2nd time I change bearings, as a matter of course, I've been replacing the hubs too...but I never had a failure again.
Maybe that one hub was flawed...I really can't be sure.
And, until recently, it never occurred to me that they could have been different for a Mk1a vs Mk1b...and still don't know...

But again, if the FX16 rear hubs are really identical, except for a slightly larger OD, then I really fail to see the supply problem. In fact, my curiosity is further piqued as I'm not sure if the Mk1b (87+) don't happen to be the same. This is why I keep asking about the exact diameter
 

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my primer on MKI hub failures

http://carpron.com/multisite/v/Upload/PDoane/HubAxleInfo1.JPG.html?g2_navId=x5de927b4

http://carpron.com/multisite/v/Upload/PDoane/HubAxleInfo2.JPG.html?g2_navId=x5de927b4

http://carpron.com/multisite/v/Upload/PDoane/HubAxleInfo3.JPG.html?g2_navId=x5de927b4

After the first one (Early Signs in the primer) for me, I was checking them before every race. The Total Failure one in the primer went from no signs of any cracks before the race weekend to total failure in the race. As far as I know, both those items were original equipment on my '85 car. One of the replacements failed within 1 season, but it was hit hard by a Miata at Pocono. My experiences were as an ITA car (less weight than these guys are running at ITB specs)
 
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