Experiment: A "fast road" alignment spec for the GT4
03-29-2017, 01:50 PM
#16
My settings are:
Front -2.5 deg on camber and toe is .1mm (I like a bit of toe out for the track but really don't like it on the street)
Rear -2.0 deg on camber and total toe is 2mm
Added shims both front and rear to get the camber.
Bars full soft front and medium rear. ( I take the time/laps to get the tires up to pressure)
I am using TPC rear toe links and their DSC system.
First time on track with this setup will be at the Smokies event next month.
Front -2.5 deg on camber and toe is .1mm (I like a bit of toe out for the track but really don't like it on the street)
Rear -2.0 deg on camber and total toe is 2mm
Added shims both front and rear to get the camber.
Bars full soft front and medium rear. ( I take the time/laps to get the tires up to pressure)
I am using TPC rear toe links and their DSC system.
First time on track with this setup will be at the Smokies event next month.
Might try 1.2mm next time around to see if anything changes. It's just unnecessary rear drag and tire wear to go higher than necessary I think. Running same camber as you as well.
03-29-2017, 04:29 PM
#18
Rennlist Member
you are high on the rear toe vs recommended with dsc and tpc rear toe links. Might want to give them a call to discuss. Max they recommend is 1.5mm total in the rear for full track. Im running 1.5mm and can say it works better than before when I ran much higher toe in the rear without their toe links and dsc.
Might try 1.2mm next time around to see if anything changes. It's just unnecessary rear drag and tire wear to go higher than necessary I think. Running same camber as you as well.
Might try 1.2mm next time around to see if anything changes. It's just unnecessary rear drag and tire wear to go higher than necessary I think. Running same camber as you as well.
Thanks for sharing your thoughts.
03-29-2017, 05:47 PM
#19
Rennlist Member
Thread Starter
I am
-2.2 front
-1.8 rear
zero toe front
a tad toe in rear, forget off hand.
ARB middle/middle
imo that's a faster better road spec car than the OP's
My set up is based on pyro testing on the tyres inc track work.
you don't want toe out either on a road car imho it's a pain in the ****.
Imo you don't want to adjust tyre pressure up 4psi either, again my set up is pyro tested, not guessed.
If I put 4psi extra in my tyres I would get the middle of the tyre hotter than either edge and thus less grip as the contact patch will not be correct.
My geo also works ok on track and is very well balanced, again on the limit the rear ARB on full stiff is not that stable. Tried it and was nice to begin with but when pushed to 100% not a stable set up.
was ok on the road with stock geo, but with a more focused geo ARB works best in the middle imo.
The car did need rear toe links, but the front is ok at -2.2 and caster is fine.
I do think people over do the rear camber looking at peoples set up's.
-2.2 front
-1.8 rear
zero toe front
a tad toe in rear, forget off hand.
ARB middle/middle
imo that's a faster better road spec car than the OP's
My set up is based on pyro testing on the tyres inc track work.
you don't want toe out either on a road car imho it's a pain in the ****.
Imo you don't want to adjust tyre pressure up 4psi either, again my set up is pyro tested, not guessed.
If I put 4psi extra in my tyres I would get the middle of the tyre hotter than either edge and thus less grip as the contact patch will not be correct.
My geo also works ok on track and is very well balanced, again on the limit the rear ARB on full stiff is not that stable. Tried it and was nice to begin with but when pushed to 100% not a stable set up.
was ok on the road with stock geo, but with a more focused geo ARB works best in the middle imo.
The car did need rear toe links, but the front is ok at -2.2 and caster is fine.
I do think people over do the rear camber looking at peoples set up's.
03-29-2017, 07:58 PM
#20
I really like it.....even my wife likes it since it soften the suspension a bit on Normal mode when you are not pushing it and gets down to business even in Normal mode when you get agressive on your driving....really cool mod and very easy to do or uninstall. You should talk with Tom from TPC as he is very knowledgeable on the DSC and explained everything and how DSC is an improvement over stock. I originally purchased the TPC toe links but after numerous e-mails he convinced me as I was a bit skeptical on how much of an improvement the DSC would make. I feel the car is easier to drive on the edge with the DSC.....I have a specific Map on the DSC for TPCs toe links.
03-29-2017, 08:20 PM
#21
Instructor
I've gone more aggressive than what is suggested here, "All in" as they say. After 3 different setups (one even more aggressive), this is where we've landed. It's quite good now...
- 3.0 F zero toe
- 2.5 R very mild toe in
Caster set to within the proper range.
ARB Soft F, Hard R
Ride height lowered (I don't remember how much F/R)
Tire wear is now perfectly even across the tread face, with 32/33 psi hot.
My main experience with the GT4 is that the rear feels glued to the pavement, unbelievably stable, while front develops a steady state push mid-corner, requiring a lift to get back on line. This new setup is much better, as in 'looser' and more balanced, though I haven't tried it yet with new MPSC 2's. (I've got a zillion heat cycles on the current tires so they are slippery and a bit unpredictable at/above the limit).
As far as street driving goes, it is extremely precise, and goes exactly where I point. The added camber, if anything, gives it a crisp, effortless feel. With 6K miles on the tires, there is no excess wear on the inner edges.
Conclusion: If you push it hard on track days, the aggressive setup is worth it. And IMO it drives quite nice at street/city speeds.
My $0.02.
- 3.0 F zero toe
- 2.5 R very mild toe in
Caster set to within the proper range.
ARB Soft F, Hard R
Ride height lowered (I don't remember how much F/R)
Tire wear is now perfectly even across the tread face, with 32/33 psi hot.
My main experience with the GT4 is that the rear feels glued to the pavement, unbelievably stable, while front develops a steady state push mid-corner, requiring a lift to get back on line. This new setup is much better, as in 'looser' and more balanced, though I haven't tried it yet with new MPSC 2's. (I've got a zillion heat cycles on the current tires so they are slippery and a bit unpredictable at/above the limit).
As far as street driving goes, it is extremely precise, and goes exactly where I point. The added camber, if anything, gives it a crisp, effortless feel. With 6K miles on the tires, there is no excess wear on the inner edges.
Conclusion: If you push it hard on track days, the aggressive setup is worth it. And IMO it drives quite nice at street/city speeds.
My $0.02.
03-30-2017, 09:02 AM
#22
I did the TPC upgrade about a month ago and their recommendation on the rear was 1 mm toe in except in their 2 most extreme alignment specs which go up to -1.2 mm and -1.5 mm...also camber on the rear goes past -2 deg on these setups.
Last edited by jmartpr; 03-30-2017 at 11:18 AM.
03-30-2017, 10:51 AM
#23
Rennlist Member
-1.2 and -1.5 rear toe per side on the extreme settings? That would be interesting.
03-30-2017, 11:16 AM
#25
03-30-2017, 11:24 AM
#26
03-30-2017, 11:32 AM
#27
Good idea....I double checked the e-mail from Tom and our notes post alignment and it says per side.....definitely lets check with them.
03-30-2017, 11:39 AM
#28
I may be wrong. It looks like I might have not read one of the emails sent where he was talking about per side toe. Hopefully one of them chimes in
03-30-2017, 12:28 PM
#29
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Hey all...sorry for the confusion.
The recommended toe settings are PER SIDE.
Updating the setup sheet now to make this explicit.
The recommended toe settings are PER SIDE.
Updating the setup sheet now to make this explicit.
__________________
Dedicated Performance. Daily Comfort.
sales@dscsport.com | (410) 799-7798
Facebook | Instagram | Twitter
Sign up for our Newsletter
Dedicated Performance. Daily Comfort.
sales@dscsport.com | (410) 799-7798
Facebook | Instagram | Twitter
Sign up for our Newsletter
03-30-2017, 02:01 PM
#30