1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Whats the advantage of this modification

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Old Jul 2, 2018 | 05:27 PM
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Whats the advantage of this modification



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Whats the advantage of modifying the upper arm like this? With rod end on the out side. Adjustability? more length from the upper arm.? Is it needed for the panhard bar? Just found this in a ad on CL was curious.

Last edited by Holdfast; Jul 2, 2018 at 06:31 PM.
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Old Jul 3, 2018 | 08:23 AM
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Nothing I've ever seen before but its very interesting to say the least.
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Old Jul 3, 2018 | 09:01 AM
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looks like an attempt to reduce binding. I wonder how well it works
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Old Jul 3, 2018 | 10:19 AM
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Likely used for changing or restoring pinion angle on lowered car? to alleviate vibration issue.
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Old Jul 3, 2018 | 02:41 PM
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I am almost guessing that it is to move the upper link out of the way of the rear spring and adjustable perch!
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Old Jul 3, 2018 | 04:19 PM
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I'm guessing an attempt to reduce binding by making the upper link straighter ( the stock one is on a pretty savage angle), and a bit of adjustability with pinion angles, as well as correcting geometry on a lowered ride height with the extra mounting points.. who knows if any of it works though.. it looks pretty rough. I wonder what the lower trailing arm mount looks like on the diff? I doubt it is to clear the spring perches.. I have no problems with clearance on mine.
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Old Jul 4, 2018 | 03:21 PM
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I'll second the adjustability of the pinion angle for either a lowered car and/or for better rear end control at power on at corner exit at wot.

Anyone else notice the left jam nut is loose? Also those welds look like boogers and why not paint them? Weird

Wait a second, that pan hard is backwards from all others I've ever seen... wonder how they managed to get everything to fit around the muffler... no muffler would solve that, which leads me back to thinking this is a track car.

Later edit: the engineer in me had to point out the new setup is in single shear...

Last edited by swbtm; Jul 4, 2018 at 08:59 PM.
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Old Jul 4, 2018 | 03:56 PM
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Originally Posted by Freeskier7791
looks like an attempt to reduce binding. I wonder how well it works
Probably makes it worse, since there is no rubber in that link to allow for the length changes required when you use unequal length arms.

I REALLY need to make that rear suspension video.
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Old Jul 4, 2018 | 03:58 PM
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Oh yeah - My assumption is that the link was moved out so that standard 5" diameter racing springs can be used. They foul on the stock upper links.
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Old Jul 4, 2018 | 04:44 PM
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Makes sense to me Pete!
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Old Jul 4, 2018 | 05:03 PM
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^ no problem with 5" springs on mine...? RE Speed set up.
agree with every point made so far apart from that though.
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Old Jul 4, 2018 | 05:09 PM
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RESpeed makes some great products. Billy did a great job with that stuff!
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Old Jul 4, 2018 | 08:28 PM
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The stock rubber bushing is definitely still there, which makes me think it’s a stock arm modified to change the pinion angle.
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Old Jul 5, 2018 | 09:26 AM
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Originally Posted by peejay
Probably makes it worse, since there is no rubber in that link to allow for the length changes required when you use unequal length arms.

I REALLY need to make that rear suspension video.
I am gonna be making a video series on fixing the rear suspension with a trilink and panhard
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Old Jul 5, 2018 | 09:28 PM
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I’ve had the triblink and Panhard bar on my SA for years and I think it’s a great solution to the bind you get on a lowered Rx7.
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Old Jul 6, 2018 | 02:53 AM
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The pics are from a ITA track car that saw for sale on CL. According to the ad it was a pretty successful car. It looks like the reason for the modification is to get around the springs.
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Old Jul 10, 2018 | 12:11 AM
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I like this solution to the upper arm length.
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Old Jul 10, 2018 | 07:03 PM
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That is similar to what MRTE did with the Group B RX-7s. From what I have seen, they just used lower links in the upper position, and mounted them so they would be parallel in side view.

They also had full floating axles. Not sure if Mazda based or if they just used Ford Atlas axles like Toyota did. I DO have the B255 homologation paperwork, I should look into that a bit more.
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Old Jul 10, 2018 | 08:11 PM
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The FIA homologation show boxes welded into the body for upper mounting points and a special axle housing.

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Old Jul 12, 2018 | 11:44 AM
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Thanks for the pic.

So, yes, they trussed the rearend, made it full-floating, and turned the rear links into a Group 4 Escort, which is pretty much what everyone with solid axles were doing.
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Old Jul 13, 2018 | 04:31 AM
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Here is a video I did trying to show what happens when you lower the car
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