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My dealer, who I like, wants to do track alignment for me. DSC suggests Toe of -0.5MM. Dealer says his equipment does it in degrees. Does anyone know what -0.5mm toe is in degrees?
If it matters I am running 315/680/18F and 325/705/18R. From the calculations I have seen, tire diameter matters. I am assuming that what DSC recommends is for the stock Cup2 Z06 tire diameter.
My dealer, who I like, wants to do track alignment for me. DSC suggests Toe of -0.5MM. Dealer says his equipment does it in degrees. Does anyone know what -0.5mm toe is in degrees?
If it matters I am running 315/680/18F and 325/705/18R. From the calculations I have seen, tire diameter matters. I am assuming that what DSC recommends is for the stock Cup2 Z06 tire diameter.
thanks, paul
He obviously doesn't know his equipment because all alignment machines can read both with the touch of a button. But IIRC -.5mm is -.044 degrees.
Was rear caster on a separate screen or sheet? It's not listed on the screen shot under "Primary Angles/Rear".
There are no alignment machines available that measure rear caster it has to be performed manually.
Sean that is sad GM cant even get the rear caster close on a ZRI. Half the C7's we align have the caster is way off and never are they equal from side to side. With that said I would NEVER track a C7 without first having that checked.
The alignment from the factory on the ZR1 looks just like the Z06 and GS alignments. Front camber was around -1.0 and rear was around -1.3. We didn't spend too much time on before measurements since we knew we needed to pull the wheels and remove UCA washers before mounting the heads for the real alignment. Here is what it read with stock alignment *after we pulled the washers*.
Was rear caster on a separate screen or sheet? It's not listed on the screen shot under "Primary Angles/Rear".
As Mad Dog said, none of the alignment machines measure "rear caster" so it has to be done manually. There is a special tool for this and it's actually pretty easy to measure...
The alignment from the factory on the ZR1 looks just like the Z06 and GS alignments. Front camber was around -1.0 and rear was around -1.3. We didn't spend too much time on before measurements since we knew we needed to pull the wheels and remove UCA washers before mounting the heads for the real alignment. Here is what it read with stock alignment *after we pulled the washers*.
You removed the UCA washers? I did on my Z06 but the owners manual for 2019 said NOT to remove the washers for the ZR1 so we didn't.
You removed the UCA washers? I did on my Z06 but the owners manual for 2019 said NOT to remove the washers for the ZR1 so we didn't.
I hadn't read that but just checked the OM for 2019 and it says not to remove washers for the GS, Z06, or ZR1. I don't see anything different from 2017 to 2019 in the UCA so we removed them.
Grand Sport, Z06, and
ZR1 models – do not remove
washers from front or rear upper
control arm bolts.
Nice Sean! I'm looking forward to watching developments with the new car.
Also, the Essex/AP Racing crew will be heading to VIR for the NCM event late next month, so maybe you can take me out for a spin.
Come on by! I can at least promise you a ride. Depending on how the CCBs hold up to my two open track days at Summit Point I may have the AP Racing brakes back on the car at VIR.
There are no alignment machines available that measure rear caster it has to be performed manually.
Sean that is sad GM cant even get the rear caster close on a ZRI. Half the C7's we align have the caster is way off and never are they equal from side to side. With that said I would NEVER track a C7 without first having that checked.
They are within the GM spec which is for the caster to be set at 0.00 degrees with a tolerance running from +0.8 degrees to -0.8 degrees with no cross caster spec called out.
[QUOTE=Questar;1597271920]As Mad Dog said, none of the alignment machines measure "rear caster" so it has to be done manually. There is a special tool for this and it's actually pretty easy to measure...QUOTE]
Thanks for posting the pics of the tools in place for measuring rear caster.
It's beyond disappointing that GM can spend almost a billion $ on the factory, then skimp on a more precise alignment on a car costing $120,000+. It's a part of their quality control that needs to be done better.
Hopefully the C8 will be better in this regard.
As Mad Dog said, none of the alignment machines measure "rear caster" so it has to be done manually. There is a special tool for this and it's actually pretty easy to measure...QUOTE]
Thanks for posting the pics of the tools in place for measuring rear caster.
It's beyond disappointing that GM can spend almost a billion $ on the factory, then skimp on a more precise alignment on a car costing $120,000+. It's a part of their quality control that needs to be done better.
Hopefully the C8 will be better in this regard.
Honestly most of the dealer network are incapable of doing a proper alignment on a corvette. Most are only now (4 years into production of the C7’s) getting the tool to measure rear caster and many in the dealership network still don’t know that rear caster can be adjusted or how to do it. Most of their alignment machines are not properly setup to do an accurate alignment to the tolerances “we” want... in my opinion that’s why GM sets such wide tolerances... to hide the fact the dealerships cannot achieve any better. Many of the dealership alignment machines are not properly levelled... so results are flawed... but “within tolerances”.
Think about this... my car arrived at the dealership (like all the others) with the skirts, wing, etc. packaged separately, for dealership PDI and installation. Except the rear wing requires a tool that the dealership didn’t own... they had to scramble to buy one. That just blew my mind... I don’t understand how GM does that.
All prep items complete and I also decided to change the diff fluid before I go and again after. Tuesday we go to Summit Point for the maiden outing. Two days of open track with typically very few cars. It should be a solid run down.
If I can figure it out I'll try some live streaming during the day but worst case I'll have a debrief and track videos up afterwards.
Was just going to ask you "when's the day!" but you answered.
I hope you will document the whole day with a video. looking forward to seeing an unbiased opinion non magazine or GM employee etc, in comparison of the ZR1 v the C7Z.
05-24-2018, 10:04 PM
track alignment
