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| Northstar rebuild: Will style (Page 76/119) |
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FieroWannaBe
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FEB 19, 03:11 PM
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Awesome. This gives me some ideas and reinforcment for my planned modification to the front of my racecar.
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fierogt28
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FEB 19, 05:23 PM
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Will, its sounds like your brake set-up isn't stock. This is what I want to know.
The 84-87 calipers bolt directly to the knuckle with two Torx-50 bolts.
Those pics with the brackets are bolted from the knuckle (the old caliper mounting points) and the caliper is
bolted on the bracket. You won't find any spec in the FSM for a modified set-up.
Nobody can actually give you a torque reading unless you use the torque spec use to bolt the caliper to the knuckle.
I owned an 86GT years ago, and there is no caliper brackets what-so-ever. The caliper bolts to the knuckle.------------------
fierogt28
88 GT, Loaded, 5-speed.
88 GT, 5-speed. All original.
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Will
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FEB 19, 05:57 PM
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| quote | Originally posted by fierogt28:
The 84-87 calipers bolt directly to the knuckle with two Torx-50 bolts.
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This is not correct. The calipers bolt to cast or forged brackets which bolt to the knuckles. The Torx bolts attach the caliper to the bracket. There are two conventional hex bolts with 12mm threads that bolt the bracket to the knuckle.
Edit: Photos of stock bracket: http://www.fiero.nl/forum/F.../HTML/122182.html#p7
What the aftermarket kits do is replace the stock bracket with an aftermarket bracket that holds a different caliper.[This message has been edited by Will (edited 02-19-2013).]
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fierogt28
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FEB 19, 06:59 PM
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| quote | Originally posted by Will:
This is not correct. The calipers bolt to cast or forged brackets which bolt to the knuckles. The Torx bolts attach the caliper to the bracket. There are two conventional hex bolts with 12mm threads that bolt the bracket to the knuckle.
Edit: Photos of stock bracket: http://www.fiero.nl/forum/F.../HTML/122182.html#p7
What the aftermarket kits do is replace the stock bracket with an aftermarket bracket that holds a different caliper.
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Will, I understand what you mean now...sorry my mistake. That's for the link for pics...that clairifies everything. 
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Will
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FEB 19, 09:54 PM
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But the FSM doesn't cover the bracket to knuckle bolts... at least not that I've been able to find.
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Will
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MAR 09, 03:47 PM
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Last weekend I got the FINAL wires hooked up for the Shelby harness adapter.
The Shelby A/C request signal from the HVAC panel is analogous to the Fiero A/C on signal. The Shelby computer reads ground via the pressure cycling switch and operates the compressor 100% via software.
I grounded the Shelby pressure cycling switch wire. This *should* cause the Shelby PCM to keep the compressor on at all times except over 86% throttle or above ~4000 RPM. Meanwhile, the Fiero A/C system will continue to work as it currently does.
My alternative was:
In the Fiero, the pressure cycling switch has switched +12V from the HVAC panel on one side and the A/C comp relay primary on the other side. To make the Shelby setup work, I'd have had to take the +12V side of the PCS and ground it, then redirect the relay primary high side wire to the PCM instead. I'd then have to pull relay primary power from the PCM power supply.
Making those mods to the car didn't give me the reversibility I was looking for, which is the whole reason I'm building the harness adapter instead of modifying the harness right away.
I spliced the OBDII port into the harness adapter. I squeezed the two ground wires from it, the pressure cycling switch wire and the MAF ground wire--all 20 ga--into one 16-18 splice with one 18 ga wire on the other side, so I can ground them all with one lug.
I added the A/C request wire from the C203 to the Caddy PCM connector. The Caddy system did NOT originally have an A/C Request line because the PCM received A/C comp instructions from the HVAC panel via the data bus. The HVAC panel monitored the functions of the A/C system.
I also added a clutch switch wire from the C203 (would be the TCC brake switch in an auto trans car) to the Caddy PCM cruise brake switch pin.
I ALSO finally ran the clutch switch wire from the clutch switch to the chassis side of the C203. It wasn't as much of a PITA to fish it through the console as I thought it would be, but it works now.
I'm flying out for two weeks with the Navy on Saturday, so I won't be able to work on this again until 3/23 at the EARLIEST, as I may have an additional 2 weeks taking me through 4/6 or so. My girlfriend is having knee surgery on 4/8, so I'll won't be able to to work on the car much while she's recovering from that.
What remains to do for the Shelby computer is to swap the OBDI throttle to the OBDII throttle--which appears to be a PITA because the throttle has to be disassembled and reassembled on the manifold vice just bolting on--then install the harness adapter and computer.
In addition to getting laid off on Monday, I also hit some expressway debris which flattened my rear tire. I already needed front tires, so I just had to order 4. Feh.
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Will
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MAR 09, 04:02 PM
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Bad alignment sent my front tires to an early grave. I hit some road debris Monday that did the same to one of my rears... So now I get to buy an entire set of tires. And I have to limit myself to the cheapos, too, because of the layoff.
The shop that mounted and balanced attempted to align and found that the UHMW Polyethylene bushings I'd made years and years ago were worn. I guess it's time for spherical bearings now. I had originally gone with UHMW PE on the assumption that spherical bearings would be "too harsh" for a street car. Having driven the UHMW bushings, I think that's bunk. To me, they are barely worse than rubber.
So I figure I'll just snag a bunch of these: http://secure.chassisshop.com/partlist/6455/
And weld them into the control arms. The only ticklish part will be tacking them in place to make sure that they're positioned correctly so that they bolt in without any axial preload on the spherical bearings.
Then I'll have serviceable spherical bearings for the rear control arms and front lowers... probably easiest pushing changes possible in a Fiero.
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Will
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MAR 09, 04:16 PM
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Does anyone have the outer shell diameter dimensions of the rear and front lower control arm bushings?
Having that info will help me pick out the right weld cup without having to buy trial bushings myself.
Of course those bushings are fairly cheap, so I may just snag them anyway.
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ericjon262
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MAR 09, 04:46 PM
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| quote | Originally posted by Will:
Does anyone have the outer shell diameter dimensions of the rear and front lower control arm bushings?
Having that info will help me pick out the right weld cup without having to buy trial bushings myself.
Of course those bushings are fairly cheap, so I may just snag them anyway. |
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I can get you the rear size, I'll just have to find my calipers when I get home.
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Will
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MAR 09, 08:39 PM
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