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Whats the advantage of this modification
https://cimg5.ibsrv.net/gimg/www.rx7...67eb284398.jpg
1 https://cimg2.ibsrv.net/gimg/www.rx7...e508acbf3f.jpg 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. |
Nothing I've ever seen before but its very interesting to say the least.
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looks like an attempt to reduce binding. I wonder how well it works
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Likely used for changing or restoring pinion angle on lowered car? to alleviate vibration issue.
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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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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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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... |
Originally Posted by Freeskier7791
(Post 12285733)
looks like an attempt to reduce binding. I wonder how well it works
I REALLY need to make that rear suspension video. |
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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Makes sense to me Pete!
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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. |
RESpeed makes some great products. Billy did a great job with that stuff!
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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. |
Originally Posted by peejay
(Post 12286050)
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’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. |
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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I like this solution to the upper arm length. https://cimg8.ibsrv.net/gimg/www.rx7...06b6e32041.jpg
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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. |
The FIA homologation show boxes welded into the body for upper mounting points and a special axle housing.
https://farm5.staticflickr.com/4362/...2ed5c432_o.png |
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. |
Here is a video I did trying to show what happens when you lower the car |
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