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Discussion Starter #1
I've begun the development of UHMW bushing kits to replace the stock bushings in the rear IRS sub-frame, which are no longer available from Ford.

More info HERE.
 

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I'll be interested as soon as I get the cash. Probably a couple months away I'd say.
 

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Discussion Starter #4
Making progress. :D

The upper prototype is complete, and came out just as I had designed it. Tomorrow I'll make the lower prototype.

 

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Nice work! I had seriously considered doing this myself when I worked at a machine shop. I had 2 new factory bushings that I measured some dimensions off of. I had looked fairly quickly in a MSC catalog for polyurethane and Delrin and that would have been REALLY expensive for the right diameter. Although I just checked online and its not THAT bad. I didn't go much farther though because I needed the car on the road really soon so I bought them from the dealer. :(

Just curious, why the diff dia aluminum sleeves for front and rear? IIRC the bushings are the same exterior size front and rear. Is it to make the front ones a little stiffer?
 

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PostWhore, The AFDB is on a lil tight.
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Thats awesome there is now a replacement part for the factory bushing that really is an upgrade. Can't wait to hear about the handling when you take it to the road, this was one of the last suspension parts I considered replacing but not now. I hope others will support this enough for a few batches.
 

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Discussion Starter #8
Nice work! I had seriously considered doing this myself when I worked at a machine shop. I had 2 new factory bushings that I measured some dimensions off of. I had looked fairly quickly in a MSC catalog for polyurethane and Delrin and that would have been REALLY expensive for the right diameter. Although I just checked online and its not THAT bad. I didn't go much farther though because I needed the car on the road really soon so I bought them from the dealer. :(

Just curious, why the diff dia aluminum sleeves for front and rear? IIRC the bushings are the same exterior size front and rear. Is it to make the front ones a little stiffer?
Delrin isn't the correct material for this application, it's just too hard. UHMW, amongst its other properties, resists the transmission of noise and vibration due to its composition. It is damn difficult to machine, however.

Where did you get the idea that I was using two different sleeve diameters? I originally thought that I'd use two different lengths, as the stock front and rear Bushings ARE different, but upon further investigation, I'm going to use the same length for all 4 positions.
 

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Where did you get the idea that I was using two different sleeve diameters? I originally thought that I'd use two different lengths, as the stock front and rear Bushings ARE different, but upon further investigation, I'm going to use the same length for all 4 positions.
Yea, I'm retarded.:zbash: I just re-read the other link and that's obviously length.
 

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Discussion Starter #13

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Discussion Starter #14 (Edited)
Road and Track Results

Tested on my '95 SC

ROAD

My car is already setup pretty stiff. H&R Springs, Koni Shocks (set + 1 1/2 turns from full soft), Delrin IRS Bushings, 1 3/8" bars F&R.

Even so, I was expecting a fairly dramatic change, and a noticeable increase in NVH. However, the change wasn't all that much. There is a slight increase in harshness over expansion joints and the like, and a little more mechanical noise, but not much. I would have no issue using these mounts on a daily driver.

I made the round trip to Englishtown (70 mile round trip) today on DR's, so I didn't push too hard in the corners, but it did feel more stable. I'll take a road trip later this week on my street tires, and push a little harder.

TRACK

On 3/10/2010 @ Englishtown, I had my best previous results. The DA that night was -912 feet.

My best ever 60' was 1.765
My best ever ET was 12.925

Today I went to Englishtown again. The DA today ranged from -685 to -558 feet.

I made no changes to my car, other than the UHMW sub-frame mounts.

Same tune, gas (Exxon 93), tires (MT 275/40-17 DR's), tire pressure (20 lbs.), and the same launch RPM (3,500).

My new best 60' is 1.742, and another 1.759
My new best ET is 12.879, two others were 12.921 and 12.913

So, in worse conditions, I picked up .023 on the 60' and bettered my previous 1/4 mile time by .046.

Most noticeable was the lack of drama during shifts. Previously, the car sort of shimmied when I shifted, today I felt none of that.

I'm quite pleased with the early results. I think with more passes I can improve even more, now that the car is planted better.
 

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Discussion Starter #15
All kits that have been paid for are shipping in the morning via USPS Priority.

Only 1 kit remaining from this batch. Then it will be quite some time before another batch is available.
 

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PostWhore, The AFDB is on a lil tight.
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DLF I think you just improved the stock IRS, Are you going to test them in the mark8.

DO you think its possible to design a front lower control arm out of aluminum, that can more than handle the car weight and stresses and save unsprung weight. I have a feeling ford could have done aluminum in the front if only for the mark 8. It would also need lifetime bushings if it was to be done aftermarket.
 

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Discussion Starter #17
DLF I think you just improved the stock IRS, Are you going to test them in the mark8.
No, my stock bushing in the LSC are fine, and it doesn't have enough power (yet!) to stress them.

DO you think its possible to design a front lower control arm out of aluminum, that can more than handle the car weight and stresses and save unsprung weight. I have a feeling ford could have done aluminum in the front if only for the mark 8. It would also need lifetime bushings if it was to be done aftermarket.
Anything's possible, but that's beyond my capabilities.
 

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No, my stock bushing in the LSC are fine, and it doesn't have enough power (yet!) to stress them.



Anything's possible, but that's beyond my capabilities.
What about the front strut rod bushings? Ford is the only option and the aftermarket sucks. They are simple doughnuts with metal ferrules and washers.
 

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Discussion Starter #19
What about the front strut rod bushings? Ford is the only option and the aftermarket sucks. They are simple doughnuts with metal ferrules and washers.
The Ford parts are good, and still available, why reinvent the wheel?
 
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