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Am I ruining my car?

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Kamys
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Am I ruining my car?

Post by Kamys » Thu Jun 14, 2018 4:10 pm

Hello everyone,

Since I got my dream car (the RX-8), I wanted to replace bits on it to make it better, 10 years ago I would've opted for 5 turbo chargers on it, now I just want to make it a healthy, reliable (subject to stock availability) and agile. Therefore I started to change parts in the order they started to crap out (as I bought the car on 34k miles). First thing to crap out was the coils, which I managed to change in time (got the 585's) - very happy about those, then I got new bushes as the old ones were being squeezed out of their place like ancient tooth paste. For the bushes I chose these: https://www.racingbeateurope.com/bmazda ... 1923-p.asp ...now...its been a pain to change (and very much expensive) as the bolts were rusted, the bushes don't come with all the sleeves and so on, the ride now its very stiff, a lot more than I expected. How bad will the vibrations ruin the frame? Should i go back to OEM?

Now the break rotors are crapping out, and I'd like to go for: https://www.racingbeateurope.com/bstopt ... 1411-p.asp
Is it a good choice? As for break pads, I'd go for these, unless I'm being recommended otherwise: https://www.racingbeateurope.com/bhawk- ... 1259-p.asp

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Re: Am I ruining my car?

Post by PeteH » Thu Jun 14, 2018 4:27 pm

Polybushes will make the ride and vibrations worse than using Mazda bushes, because Mazda did a brilliant job. You won't damage the car, so whether you stick with them or not is your choice. Do make sure you have fitted them correctly though. The bushes should be correctly greased, and all the arms should be free to move.

Note that it is most unusual for the Mazda bushes to fail at that mileage. They can usually last for the life of the car.

The brake components you have chosen are a very high specification. If that's what you want then go for it. They will be great.
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Re: Am I ruining my car?

Post by warpc0il » Thu Jun 14, 2018 8:42 pm

The only time I've seen suspension bushes fail that quickly is where someone has loosened the lower A-frame bolts and retighten with the wheels hanging.

This makes the car sit high and put a massive strain on the bushes.

The Mazda bush material is pretty resilient but it's possible that someone has steam cleaned or used a nasty chemical to clean the underside and this has damaged the bushes.

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Re: Am I ruining my car?

Post by wiggles » Thu Jun 14, 2018 8:57 pm

I had to change one of mine because of a seized bolt rather than the bushing failing... it took a LOT of work to get the rubber/metal out of the control arm certainly cant see it falling apart by itself easily!
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Re: Am I ruining my car?

Post by Kamys » Thu Jun 14, 2018 10:45 pm

https://www.rx8ownersclub.co.uk/forum/v ... t#p1110172 this is a picture of the bushes last summer...this winter they shattered

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Re: Am I ruining my car?

Post by warpc0il » Thu Jun 14, 2018 10:48 pm

That bush has been twisted by being bolted up with the suspension extended, hence it ripped apart.

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Re: Am I ruining my car?

Post by PeteH » Thu Jun 14, 2018 11:09 pm

I'm not convinced that the car hasn't got some accident damage either. The bushes don't appear to be "co-axial", so they look like they have a permanent twist on them. And the subframe looks deformed. This would explain why the Mazda bushes failed, and why the polybushes feel so harsh.

It's impossible to say from one picture. But given that your bushes failed, I'd be worried about the integrity of the upper arm.
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