993 Carrera 4 Rake question
#1
Track Day
Thread Starter
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I'm getting some instability when running above 65-70mph on straight roads. Alignment has been checked and set, including Kinematic Toe, tires and pressures are good.
I seem to remember that a 993 has a requirement to set a rear-front rake, is this true, and how is it measured and set.
I have KW Type 3 all round, RS Hubs and matching track rods.
I seem to remember that a 993 has a requirement to set a rear-front rake, is this true, and how is it measured and set.
I have KW Type 3 all round, RS Hubs and matching track rods.
#2
RL Community Team
Rennlist Member
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I'm getting some instability when running above 65-70mph on straight roads. Alignment has been checked and set, including Kinematic Toe, tires and pressures are good.
I seem to remember that a 993 has a requirement to set a rear-front rake, is this true, and how is it measured and set.
I have KW Type 3 all round, RS Hubs and matching track rods.
I seem to remember that a 993 has a requirement to set a rear-front rake, is this true, and how is it measured and set.
I have KW Type 3 all round, RS Hubs and matching track rods.
My experince of ths is when the rear kinmatic toe is set incorrectly. I have found I have had to take the car back to the dealer more than once after an alignment to get this set correctly to eliminate the high speed wandering. I would let the guy who did the alignment resolve this issue for you.
I have not experienced or have heard of others having stability problems due to rake at highway speeds.
Andy
Last edited by pp000830; 07-25-2024 at 12:21 PM.
#3
Track Day
Thread Starter
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Hi Andy
Thanks for the reply
At the time of the alignment the KT was set using the aftermarket tool from Gert at Carnewal (apparently the Porsche KT tool does not support lowered suspension)
I set the KT to the middle of the gauge and ensured it was the same both sides.
Once the KT was set the other settings, camber, static toe, were al re-adjusted to spec.
Does anybody know if any different KT setting should be used instead?
The reason for my "rake" question was I thought maybe air was lifting the front enough to cause the instability
Thanks
John
Thanks for the reply
At the time of the alignment the KT was set using the aftermarket tool from Gert at Carnewal (apparently the Porsche KT tool does not support lowered suspension)
I set the KT to the middle of the gauge and ensured it was the same both sides.
Once the KT was set the other settings, camber, static toe, were al re-adjusted to spec.
Does anybody know if any different KT setting should be used instead?
The reason for my "rake" question was I thought maybe air was lifting the front enough to cause the instability
Thanks
John
#4
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Two similar threads in the same week...
At the time of the alignment the KT was set using the aftermarket tool from Gert at Carnewal (apparently the Porsche KT tool does not support lowered suspension)
I set the KT to the middle of the gauge and ensured it was the same both sides.
Once the KT was set the other settings, camber, static toe, were al re-adjusted to spec.
Does anybody know if any different KT setting should be used instead?
....not sure what you mean by the 'middle of the gauge', but apparently the initial KT setting should show as 11 o'clock and 1 o'clock on the car - see attached pdf.
At the time of the alignment the KT was set using the aftermarket tool from Gert at Carnewal (apparently the Porsche KT tool does not support lowered suspension)
I set the KT to the middle of the gauge and ensured it was the same both sides.
Once the KT was set the other settings, camber, static toe, were al re-adjusted to spec.
Does anybody know if any different KT setting should be used instead?
Last edited by orangecurry; 07-26-2024 at 05:37 AM.
#5