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Suspension slight knock and slightly wayward feel on a 997 Turbo

domswinfield

domswinfield

New member
Hello All,

Happy New Year! Hope you all had a lovely Christmas.

I was driving my 911 on a long run on saturday and felt the car wasn't tracking straight very easily. It feels slightly wayward at times, following the lines of the road a bit to easily which it hasn't done previously. Then when driving last night I went over some speed bumps very slowly and i heard a knocking when passing over the bumps and this seemed unusual as i don't normally hear anything at all. Over normal road undulations I don't here any knocking sounds, so don't believe this is a bush noise.
I was traveling fast on saturday and the car did pass over a indentation on the motorway and compress the suspension hard. I am wondering if something is bent now? Any ideas??

I have just replaced the pads for Pagid RS14 units all around and they are squeaking like mad! Good brakes but a bit annoying. The brakes after hard use made quite a noise like they were fading but with no lose of power, any ideas??

Except for this she runs beautifully ass always. Thanks for the help.

Dom
 
Dom,
It's like spitting into the wind trying to guess a diagnosis on something as vague as a suspension knock on here.

I assume it is at the front, so you need to figure out which side it's on, then get it up onto a ramp for a thorough inspection. It's unlikely to be something bent due to suspension compression on a motorway - unless you've hit a pothole very hard, that is.

You don't give your car mileage, but I suspect it'll be a worn joint, tca, drop link or top mount (top mount defects are common on 997's). You'll know once it's been examined and when fixed you should get a full 4 wheel alignment done. It'll make a big difference to handling and road holding.

As regards the brakes, did you clean off the rotors before fitting new pads? Residual pad material or glazing on the friction surfaces will cause brake noise. Also, you'll need to bed the pads in. Assuming you've been using them lightly and high spots have now been removed, you should use them very hard from high speed for several applications until they get really hot, the pedal goes down slightly and stopping power drops off. Really rag them, then drive slowly, allowing them to cool off and recover, then you should then be set. BTW - don't ever apply the handbrake when the brakes are hot. [:eek:]

Some aftermarket pads are noisier than others and experience/advice is your friend here.

Regards,

Clive.
 
Hi Clive,

Thanks for all the help! The sound is from the left front side. I will have an inspection carried out. The mileage is just 40,000 miles, and the car has been well maintained. The brakes discs were fully cleaned before the new pads were installed and all items such as calipers were removed and cleaned/checked for operations. I will try again your brake bed in procedure, I did do this according to manufactures instructions but its a little hard not the road.

Thank you for all your help.

Best wishes

Dom
 
ok thanks Ill have them looked at when it goes in to the mechanics. How much did it cost, do you remember? Having an expensive time as we have a new baby on route in march!

Best wishes

Dom
 
I had Chris at Centre Gravity do them as he could keep the Geometry to his settings.
At a guess it was £150 as side +the Geometry setup.
I used to clonk when swapping weight across the cars (cornering) or speed bumps.
 
garyw said:
I had Chris at Centre Gravity do them as he could keep the Geometry to his settings.
At a guess it was £150 as side +the Geometry setup.
I used to clonk when swapping weight across the cars (cornering) or speed bumps.
Click to expand...


does Chris give you a geo print out with all settings Pre and post edits?
 
Yes he does a before and after printout. I can also thoroughly recommend centre gravity. Chris is the best thing since sliced bread for your Porsche suspension. His knowledge is second to none and his attention to detail is exemplary.
 
angusc said:
Yes he does a before and after printout. I can also thoroughly recommend centre gravity. Chris is the best thing since sliced bread for your Porsche suspension. His knowledge is second to none and his attention to detail is exemplary.
Click to expand...


You are not a lone voice. He has many many fans :)
 
Thanks for all the advice, does anyone know a company a little closer to London as I need to get this looked next month on my return from Asia and don't fancy driving mmiles to get there. Any recommendations? I normally use John at Tower Bridge Porsche and he had been great for the last 10 years on all my 911's.
Many suspension geniuses in London??
cheers

Dom
 
I would consider Peter Tognola in Datchet near Windsor. He is a very experienced, very reasonable chap and has raced these beast for decades. I used him to PPI my 964 two years ago and I'd use him again if I were closer.
 
I travelled for Centre of Gravity from Lincoln. Chris drove me around in the car and did a road surface test drive over a cobbled area to bring out issues like yours - water in rubber mounts can perrish them causing "snooker ball" sound - (done in Atherston Market place), and all manner of track rod ends, all sorts of possibilities - he will bring out the error, sort it and set up your car - have a day out to him, he made a huge difference to the handling on my turbo.
 
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