Discussion
All,
Developing a 996C2 for track, had KW Clubsports fitted and tracked the car for the first time last weekend.
Overall very pleased but noticed a slight steering pull to the left on the way home and after measuring the geo found that the NSR toe has gone from +5mins to +40mins - OSR toe has not moved and neither have the cambers.
The rear toe arms and bolts are new and AFAIK were torqued up correctly.
Questions: 1) would the above cause a steering pull and 2) what should I do about this - re-torque and try again?
Going to Spa in July so don't want the geo moving around and spoiling my days :-)
Cheers,
Kevin
Developing a 996C2 for track, had KW Clubsports fitted and tracked the car for the first time last weekend.
Overall very pleased but noticed a slight steering pull to the left on the way home and after measuring the geo found that the NSR toe has gone from +5mins to +40mins - OSR toe has not moved and neither have the cambers.
The rear toe arms and bolts are new and AFAIK were torqued up correctly.
Questions: 1) would the above cause a steering pull and 2) what should I do about this - re-torque and try again?
Going to Spa in July so don't want the geo moving around and spoiling my days :-)
Cheers,
Kevin
GT2rainge said:
Hi Kevin, did you have them fit new eccentric bolts and nuts?
If so I'd guess they either didn't clean and scrub the subframe where the bolts fit or/and they covered the bolts with copper slip crap. They need to be fitted dry with no lube etc on them then they shouldn't move.
Ask me how I know, plenty of tyres killed and European trips ruined because of toe moving.
Niel - I hope they did all the above given who is doing the job :-)If so I'd guess they either didn't clean and scrub the subframe where the bolts fit or/and they covered the bolts with copper slip crap. They need to be fitted dry with no lube etc on them then they shouldn't move.
Ask me how I know, plenty of tyres killed and European trips ruined because of toe moving.
OK, so had the geo reset today to pre-Anglesey specs (when the car was driving fine)...
...and its no better - so I am guessing that the stress of the day has maybe bent something - I went onto the exit kerbs on the hairpin at the end of the loop a couple of times which are very mild and spun once at fairly slow speed (Rocket) whilst staying on the tarmac.
The pull is subtle but most defintely there - the car doesnt feel as neutral as it did before the trackday.
Gonna swap the front tyres (888s) round over the weekend but think this is unlikely to be causing the issue.
All suspension compnents were inspected prior to the polybushing and KW fit - ARBs are on centre setting F&R.
Ideas?
...and its no better - so I am guessing that the stress of the day has maybe bent something - I went onto the exit kerbs on the hairpin at the end of the loop a couple of times which are very mild and spun once at fairly slow speed (Rocket) whilst staying on the tarmac.
The pull is subtle but most defintely there - the car doesnt feel as neutral as it did before the trackday.
Gonna swap the front tyres (888s) round over the weekend but think this is unlikely to be causing the issue.
All suspension compnents were inspected prior to the polybushing and KW fit - ARBs are on centre setting F&R.
Ideas?
Had a look at the tyres last eve and the geo is goign to have to be changed notwithstanding the pulling issue.
Both the n/s tyres are visibly worn on the inner half which surprises me considering i have only done one track day and 300 road miles.
Current geo is -2deg fr and -2.5deg rear with 10min of rear toe in.
I am surprised at the tyre wear, on both RSs they wear very evenly and I get 8-9 days out of a set - these will be worn out by the time I get to Spa at this rate!
Is the current geo super aggressive or par for the course for 996s that are tracked?
Thanks,
Kevin
Both the n/s tyres are visibly worn on the inner half which surprises me considering i have only done one track day and 300 road miles.
Current geo is -2deg fr and -2.5deg rear with 10min of rear toe in.
I am surprised at the tyre wear, on both RSs they wear very evenly and I get 8-9 days out of a set - these will be worn out by the time I get to Spa at this rate!
Is the current geo super aggressive or par for the course for 996s that are tracked?
Thanks,
Kevin
All,
Decided to try a different set of wheels with road tyres and found that the problem disappears and the car drives straight and true.
On inspection there is a clear wear profile on the NSR/F tyres with even wear on the OSR/F - called up Toyo and they confirmed that this could cause a steering pull.
So, I am going back to a less cambered geo as per my RSs which wear tyres very evenly - around 1.25deg front and 1.5deg rear - will use this until this becomes a limiting factor.
Thanks to all for the contributions.
Cheers,
kevin
Decided to try a different set of wheels with road tyres and found that the problem disappears and the car drives straight and true.
On inspection there is a clear wear profile on the NSR/F tyres with even wear on the OSR/F - called up Toyo and they confirmed that this could cause a steering pull.
So, I am going back to a less cambered geo as per my RSs which wear tyres very evenly - around 1.25deg front and 1.5deg rear - will use this until this becomes a limiting factor.
Thanks to all for the contributions.
Cheers,
kevin
yes, brand new and the car drove perfectly to Anglesey - it was only after the track day that i noticed the issue on the way home.
Makes sense that its the tyres if the geo is now back to what it was and nothing is bent which it shouldn't be unless I have a weak coffin arm or similar. i went over a couple of v mild kerbs at the exit of the loop hairpin and spun once on the tarmac (no grass cutting etc.)
Car goes back in Friday for re-geo and a spanner/visual check - anything else i should be doing?
Cheers,
Kevin
Makes sense that its the tyres if the geo is now back to what it was and nothing is bent which it shouldn't be unless I have a weak coffin arm or similar. i went over a couple of v mild kerbs at the exit of the loop hairpin and spun once on the tarmac (no grass cutting etc.)
Car goes back in Friday for re-geo and a spanner/visual check - anything else i should be doing?
Cheers,
Kevin
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