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Author Topic: rear shock absorbers - Powerflex bushes  (Read 1125 times)

Offline Borderline

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rear shock absorbers - Powerflex bushes
« on: June 26, 2020, 03:47:16 pm »
Hi guys, as my boggo Abarth 500 is now six years old and has suffered more than its fair share of Scottish potholes and countryside tracks, the rear suspension is tired. As well as the usual 500 clunk, it seems to skip sideways quite a lot. So I've bought replacement shockers and some Powerflex bushes. Trouble is, the new TRW shockers appear to have a smaller top eye than the originals, so the Powerflex bushes now look like they might be too big to fit  :'(  Without access to a ramp/lift, I'm struggling to see the OEM part numbers on the original shockers, in order to double-check the fitment of the new ones.  >:(

Also, has anyone fitted this type of Powerflex bush? Or swapped standard shockers but without going the full coilovers route? I don't want to get the car on the ramp, have some grease monkey tap out the top eyes and then find that nothing fits back together!

Bewildered of t'Borders.
   

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    Offline shadyracer

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #1 on: June 26, 2020, 07:45:17 pm »
    Hi, my 10 yr old scottish abarth has koni fsd rear shocks, I still have the originals, the konis are rusting severely so may have to fit std originals again but loathe to suffer the bumpy ride again. Have had no issues with bushes though, and would buy koni again, fsd now called something else, lets hope made of better metal.
    Definitely a big difference regardless of spring type too. :thumb:

    Whats the trw part number so i can check what theyre listed for, maybe standard F500 youve been given?

    Offline Borderline

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #2 on: June 27, 2020, 12:16:45 pm »
    The TRW shocks are JGT581T - according to multiple sites in multiple countries, they should fit the Abarth 500. They certainly look short enough...

    The issue with the bushes is that they're about 40mm in diameter, whereas the top eye bush in the shocks is only 36mm and I'm fairly certain the bushes aren't intended to be compressed by 4mm!  :thumbd:

    Offline shadyracer

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #3 on: June 27, 2020, 02:09:25 pm »
    TRW part number is correct for abarth listings, 38mm dia stated. No way of me confirming powerflex listings though to determine if youve been given correct bushes.
    Sorry I cant be of more help, would be keen to get your feedback on ride difference with trw brand if you fit them.

    Offline Borderline

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #4 on: July 23, 2020, 04:02:22 pm »
    OK, here's the news. Powerflex bushes fitted to rear suspension beam and TRW shockers fitted. 4-wheel alignment carried out. Ride now smoother and quieter BUT I'm still suffering the wretched clonking sound that seems to come from the offside rear. My mechanic put the car back on the ramp three times cos he thought he had missed something out or not torqued up all the bolts. No obvious deficiencies. Latest thoughts are the noise could be caused by metal on metal contact between the spring and the spring pan. The American Abarth forum has a short thread on this. I've ordered new top spring isolators and I'm also thinking of changing the springs to AH Motorsport standard rebound rate, which lower the rear ride height by 20mm but retain the current ride "quality". Hmm. 

    Offline Loki

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #5 on: September 29, 2020, 10:19:07 pm »
    Have you looked at shorter bump stops? I replaced mine yesterday and the clonk has gone

    Offline martwho

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #6 on: September 30, 2020, 11:55:03 am »
    Any lowering of the rear would defo require the coupe bump stops being fitted. Not long ago did mine, makes a difference!

    Offline Borderline

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #7 on: October 01, 2020, 11:15:04 am »
    OK, here's the outcome of several months of tinkering with the rear end. New shockers - no difference to ride or annoying clonk. Powerflex bushes in the rear suspension beam - less lateral flex, increased road noise, no difference to the annoying clonk. AH Motorsport shortened springs with original rebound rate, in combination with Coupe bumpstops, PLUS new spring isolators - ride smoother, annoying clonk finally gone! I reckon it was the isolators all along - they're hard rubber, which must degrade with time and road salt. Should have tried them first... OEM Part number is 46843237, I found a substitute on buycarparts.co.uk - part no. A7G036MT  This is for a standard, 135bhp A500, so I can't vouch for fitting in higher powered versions.

    BTW, the Powerflex bushes for the Fiat 500 rear shocker top mount DO NOT fit Abarths - which have a smaller eye, with a stiffer mount in a thicker ring.

    Offline 124Abarthreplica

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #8 on: October 01, 2020, 11:27:21 am »
    OK, here's the outcome of several months of tinkering with the rear end. New shockers - no difference to ride or annoying clonk. Powerflex bushes in the rear suspension beam - less lateral flex, increased road noise, no difference to the annoying clonk. AH Motorsport shortened springs with original rebound rate, in combination with Coupe bumpstops, PLUS new spring isolators - ride smoother, annoying clonk finally gone! I reckon it was the isolators all along - they're hard rubber, which must degrade with time and road salt. Should have tried them first... OEM Part number is 46843237, I found a substitute on buycarparts.co.uk - part no. A7G036MT  This is for a standard, 135bhp A500, so I can't vouch for fitting in higher powered versions.

    BTW, the Powerflex bushes for the Fiat 500 rear shocker top mount DO NOT fit Abarths - which have a smaller eye, with a stiffer mount in a thicker ring.

    Some useful information there Borderline, thank you :thumb:

    Offline Chino_uk

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    Re: rear shock absorbers - Powerflex bushes
    « Reply #9 on: November 18, 2020, 09:23:56 am »
    As a bit of supplementay info on upper shock bushes, in case it helps someone, there are two Powerflex items for this:

    PFR16-515 32mm long to fit original shocks (these fitted on my 2012)
    PFR16-516 36mm long to fit Koni