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| 84-87 rear spindle - why not swap out for a newer GM FWD spindle w/ large brakes? (Page 3/6) |
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qwikgta
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MAY 24, 05:57 PM
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and someday i'll get my hands on this stuff and see if I can use it.
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wftb
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MAY 24, 06:12 PM
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I was hoping the Buick you have been getting parts out of would have the hyper strut but not the case. The steering rack and its placement has a lot to do with bumpsteer and if it isn't right it will upset things.
Over all, the older cars as they first came out with skinny 13" rims and narrow tires did not have enough bump steer to worry about. And the early tests do not even mention it. Going up to 15" wheels and wider tires made it more noticeable, as wider tires tend to follow road imperfections. As has been mentioned, the tie rod is too long but the worse thing is it is also in the wrong place on the cradle.
The thing I do not like about using an alternate spindle is they are always from the front of a front drive car so there is no parking brake. So for now I will just stick to a stock rear spindle with my home made SLA suspension and bumpsteer bracket.
edit to add link to my bumpsteer bracket thread
http://www.fiero.nl/forum/Forum2/HTML/134732.html
86 GT built 2.2 ecotec turbo
rear SLA suspension
QA1 coilovers on tube arms[This message has been edited by wftb (edited 05-27-2020).]
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cvxjet
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MAY 24, 07:09 PM
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| quote | Originally posted by qwikgta:
But in the Gen I cars, isn't the rear end just a transplanted X body front end? And if so, isn't the suspension tie-rod just the steering outer tie-rod that is hard mounted to the cradle, in about the same location and height as the original steering rack? If so, and if the steering rack was kept in place, would there still be a lot of bump-steer. in other words, is there a lot of bump steer associated with the X body cars. I was not aware that the steering rack had a significant impact on the suspension geometry.
Rob |
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I can't tell from pics on the web, but I doubt that the Citation has this problem...I think it was just the guy who adapted the Citation front suspension to the Fiero was an incompetent "Drunk-chimp"....To picture what is going on during suspension movement, think of this; The A-arm tip moves in an arc with a 12 inch radius, while the tie-rod moves in an arc with a 15 inch radius.....you can see how much that would affect the rear wheel angles.....
wftb- would the Buick REAR brake calipers fit on those front spindles?
I have the total solution- we need to have all the states resurface all of the roads so they are smooth as glass....Then we'd have (Almost) no trouble with bump-steer!
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wftb
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MAY 24, 08:17 PM
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I would guess not because most FWD cars have non vented discs on the rear usually with smaller calipers. Maybe Rob could have a look next time he is at the wreckers....
Steve
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qwikgta
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MAY 24, 08:32 PM
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yea, i do remember the stuff in the rear was smaller
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mender
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MAY 24, 09:53 PM
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| quote | Originally posted by Raydar:
Seems like I have heard of people transplanting Pontiac 6000 struts and knuckles as an assembly into the rear of a Fiero, in order to allow the use of the larger bearings/hubs/axles. I don't remember exactly what the story was, however. |
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That's what I run on my Chumpcar Fiero. 1990 P6000 wagon hubs, spindles, and outer axle stubs. Big bearing, 5 x 115 wheel bolt pattern. No failures or issues. Other Fieros that get used for endurance racing seem to shed rear hubs regularly. Use the non-ABS hubs.[This message has been edited by mender (edited 05-24-2020).]
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Patrick
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MAY 24, 10:32 PM
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| quote | Originally posted by Raydar:
Seems like I have heard of people transplanting Pontiac 6000 struts and knuckles as an assembly into the rear of a Fiero...
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| quote | Originally posted by mender:
That's what I run on my Chumpcar Fiero. 1990 P6000 wagon hubs, spindles, and outer axle stubs. Big bearing, 5 x 115 wheel bolt pattern.
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Mender, just to clarify... which struts do you use?
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Blacktree
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MAY 25, 11:15 AM
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| quote | | Originally posted by qwikgta: My issues in this thread are for the 84-87 suspension. |
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I was looking at it from the perspective of swapping the '88 rear suspension into the pre-'88 Fiero. I figured it was a foregone conclusion that one would want to do that. But that may have been a bad assumption.[This message has been edited by Blacktree (edited 05-25-2020).]
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arbakken
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MAY 25, 12:38 PM
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I took a look at my donor cobalt, which appears (still have to take the fiero axles off and do some measuring, but they physically fit in the hubs) to have CV axles that match the Fiero ones, but all the distances are way off.
Even if you did manage to find a knuckle that would work, what would you do for a parking brake?
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jscott1
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MAY 25, 04:43 PM
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| quote | Originally posted by fieroguru:
But it has been done, but never made it mainstream... there are probably 20+ examples where people went down this path and ended up with running/driving cars. The issue is effort involved to bring it to completion, overall cost to get there, overall performance once complete, and is it economical to bring to market.
<snip>
Like I said, I am going down this path for the 88's because it is something I want for my personal car... but even at this stage, I can see that having something that could be brought to market at a reasonable price is well below 50/50 odds. |
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All I want is to be able to mount Corvette wheels without using adapters and experiencing catastrophic bearing failure. Like you said it's probably been done 20 different ways but I'm not smart enough to know which is the "best" way to achieve what I'm trying to do. I need one of you smart guys to build something that I can bolt on. Oh and I need it for an 88 and I need two sets. How hard is that? 
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