[Msquared]

The thing is, the PTM modes were set up for track use, and they work as advertised on a road course. However, they are pretty aggressive for use in an autocross, where things are much tighter and slower and where slip angles are often higher (even transitioning into sliding at times). I think it's been well demonstrated that turning all the nannies off is the fastest way to autocross a Camaro, and I promise you that this is how every top autocross driver (like Nationals trophy winners) runs the car.

[TrackClub]

Originally Posted by Msquared

The thing is, the PTM modes were set up for track use, and they work as advertised on a road course. However, they are pretty aggressive for use in an autocross, where things are much tighter and slower and where slip angles are often higher (even transitioning into sliding at times). I think it's been well demonstrated that turning all the nannies off is the fastest way to autocross a Camaro, and a promise you that this is how every top autocross driver (like Nationals trophy winner) runs the car.

Best response yet! Cheers!

[VR Baron]

Op, all I can add is you have changed some parts that can possibly add to oversteer issues, mainly the , I assume, the BMR sway bars. If you haven’t used them yet at an event, use the search button for sway bars to see what results and bar settings guys are using. You have gone from a stock car balance which is darn good if not slightly understeer biased to potential oversteer tail happy if the bars aren’t set right. Mainly as the rear bar settings are really stiff vs the front bar, so don’t go to crazy. Based on stiffness rates from BMR maybe try mid front bar hole and soft rear bar for a tiny bit oversteer bias if you like that, or stiff front bar setting and mid rear for a close neutral balance like stock but stiffer. If these add more oversteer then you like for controlling the possible rear sliding try stiff front soft rear bar . It will be trial and error but that’s all part of the fun!

[pontiaco1]

Originally Posted by Msquared

The thing is, the PTM modes were set up for track use, and they work as advertised on a road course. However, they are pretty aggressive for use in an autocross, where things are much tighter and slower and where slip angles are often higher (even transitioning into sliding at times). I think it's been well demonstrated that turning all the nannies off is the fastest way to autocross a Camaro, and a promise you that this is how every top autocross driver (like Nationals trophy winner) runs the car.

ok I'm going to try that way thanks!!

[pontiaco1]

Originally Posted by VR Baron

Op, all I can add is you have changed some parts that can possibly add to oversteer issues, mainly the , I assume, the BMR sway bars. If you haven’t used them yet at an event, use the search button for sway bars to see what results and bar settings guys are using. You have gone from a stock car balance which is darn good if not slightly understeer biased to potential oversteer tail happy if the bars aren’t set right. Mainly as the rear bar settings are really stiff vs the front bar, so don’t go to crazy. Based on stiffness rates from BMR maybe try mid front bar hole and soft rear bar for a tiny bit oversteer bias if you like that, or stiff front bar setting and mid rear for a close neutral balance like stock but stiffer. If these add more oversteer then you like for controlling the possible rear sliding try stiff front soft rear bar . It will be trial and error but that’s all part of the fun!

Copy that!!!

[TrackClub]

Originally Posted by VR Baron

Op, all I can add is you have changed some parts that can possibly add to oversteer issues, mainly the , I assume, the BMR sway bars. If you haven’t used them yet at an event, use the search button for sway bars to see what results and bar settings guys are using. You have gone from a stock car balance which is darn good if not slightly understeer biased to potential oversteer tail happy if the bars aren’t set right. Mainly as the rear bar settings are really stiff vs the front bar, so don’t go to crazy. Based on stiffness rates from BMR maybe try mid front bar hole and soft rear bar for a tiny bit oversteer bias if you like that, or stiff front bar setting and mid rear for a close neutral balance like stock but stiffer. If these add more oversteer then you like for controlling the possible rear sliding try stiff front soft rear bar . It will be trial and error but that’s all part of the fun!

Another excellent point!

PTM should still work regardless of balance changes, as it is based on gyros to measure yaw angles, however its effectiveness may be very different.
Also, with after market mods and all Nannies off, the car's balance could be completely different vs stock. If one does not have a really good feel of what the car is doing, then dialing it properly to actually get some level of benefit from the mods could be a long journey.

[VR Baron]

Originally Posted by TrackClub

Another excellent point!

PTM should still work regardless of balance changes, as it is based on gyros to measure yaw angles, however its effectiveness may be very different.
Also, with after market mods and all Nannies off, the car's balance could be completely different vs stock. If one does not have a really good feel of what the car is doing, then dialing it properly to actually get some level of benefit from the mods could be a long journey.

Exactly. And especially if he takes the training wheels off !

[pontiaco1]

Ok guys I just got back from doing some back to back run on some back roads with some really tight turns and the car felted much better, more planted on the rear and much responsive, I try sport 1 and 2 and track in all felt I bit different but much better, let's see how I do Sunday on the autocross, will keep you posted . Thank you all

[VR Baron]

Originally Posted by pontiaco1

Ok guys I just got back from doing some back to back run on some back roads with some really tight turns and the car felted much better, more planted on the rear and much responsive, I try sport 1 and 2 and track in all felt I bit different but much better, let's see how I do Sunday on the autocross, will keep you posted . Thank you all

Well you changed a lot and new tires. And the sway bars will make it feel better with less roll which will help camber loss with less body and tire roll. Maxing out camber helps a lot as well if you want to do that down the road. More grip and better turn in. Where are your bars set?

[pontiaco1]

Originally Posted by VR Baron

Well you changed a lot and new tires. And the sway bars will make it feel better with less roll which will help camber loss with less body and tire roll. Maxing out camber helps a lot as well if you want to do that down the road. More grip and better turn in. Where are your bars set?

my BMR bars are the non adjustable ones, I order the adjustable ones and they send me the wrong ones so I decided to install them, they are thicker than the originals though. I did the strut mod to get more camber and I was able to get negative 2.8 camber but right now it's at negative 2.0 up front and negative 1.8 rear.

[VR Baron]

Originally Posted by pontiaco1

my BMR bars are the non adjustable ones, I order the adjustable ones and they send me the wrong ones so I decided to install them, they are thicker than the originals though. I did the strut mod to get more camber and I was able to get negative 2.8 camber but right now it's at negative 2.0 up front and negative 1.8 rear.

Cool. Your front is 40% stiffer than 1le, like my hotchkiss bar set soft. Your rear is just 16% stiffer. So no oversteer worries from those. May have understeer with staggered stock tires but with the BMR suspension parts maybe ok(?) Anyway sounds like on the street it’s working for you. Autocross will tell the tale

[pontiaco1]

[QUOTE=VR Baron;11375513]Cool. Your front is 40% stiffer than 1le, like my hotchkiss bar set soft. Your rear is just 16% stiffer. So no oversteer worries from those. May have understeer with staggered stock tires but with the BMR suspension parts maybe ok(?) Anyway sounds like on the street it’s working for you. Autocross will tell the tale[/QUOTE
what tirepressure should i shootforon the SC3s??]

[pontiaco1]

Originally Posted by VR Baron

Cool. Your front is 40% stiffer than 1le, like my hotchkiss bar set soft. Your rear is just 16% stiffer. So no oversteer worries from those. May have understeer with staggered stock tires but with the BMR suspension parts maybe ok(?) Anyway sounds like on the street it’s working for you. Autocross will tell the tale

What tire pressure should I shoot for on the new SC3s ???

[Msquared]

Originally Posted by pontiaco1

What tire pressure should I shoot for on the new SC3s ???

For autocross use with those tires, I would aim for 33psi front and 31psi rear. Set pressures there for your first run, and then bleed off pressure between runs to set it back there every time, because it will gain heat/pressure on at least your first three or four runs.