[Uncle Sam]

Originally Posted by TrackClub

Makes sense. Note that the car may feel very different (especially to a high skill driver) as up to PTM sport1 both Stabilitrak and TC are present. At PTM sport2 and Race only TC is present and naturally may only engage on exits. So entry and mid corner are completely up to a driver to manage.
The only difference between Sport2 and Race is that TC is in its lowest engagement mode in the latter permitting the most tire slip vs any other setting.
I like it especially on any uneven pavement and such as it aids in maintaining forward progress. And i find it very unobtrusive and neat.

It is weird that Chevrolet decided to have TC on but not Stabilitrak, to me it should be the opposite. You should be able to dial up some rear wheel slip and therefore greater rear slip angles with the throttle but if you get say 25-30 degrees of yaw then the nannies should step in.

It seemed that even in PTM 2 that the rear slip on throttle was minimal but it might be that the throttle position sensor is graduated as has been mentioned in comments about Randy Probst's observations. Maybe Race is what would give a more responsive movement in a middle of throttle position and is what I expected. I will try it in a few weeks.

The two times that I had to lift in a corner as I had entered a little too hot, the car was very stable "off throttle" (not completely off). I thought Stabiltirak was on as the car was very neutral in its "drift" attitude; i.e. I didn't get lift throttle oversteer. My last car was mid-engine though. Maybe that V-8 up front makes the difference.

What did surprise me was a little "tail wag" under heavy braking in PTM 2. I think that is do to alignment (I have the supplement's track alignment specs) allowing the car to move at the rear with pavement "waves" in a braking zone.

You have driven Mosport with those long corners, this is where I think slightly more rear slip could steer the car more neutrally. "Wagging the tail" braking into turn 4 there would be scary. That is where I would want an electronic nanny to look out for me.

[TrackClub]

Originally Posted by Uncle Sam

It is weird that Chevrolet decided to have TC on but not Stabilitrak, to me it should be the opposite. You should be able to dial up some rear wheel slip and therefore greater rear slip angles with the throttle but if you get say 25-30 degrees of yaw then the nannies should step in.

It seemed that even in PTM 2 that the rear slip on throttle was minimal but it might be that the throttle position sensor is graduated as has been mentioned in comments about Randy Probst's observations. Maybe Race is what would give a more responsive movement in a middle of throttle position and is what I expected. I will try it in a few weeks.

The two times that I had to lift in a corner as I had entered a little too hot, the car was very stable "off throttle" (not completely off). I thought Stabiltirak was on as the car was very neutral in its "drift" attitude; i.e. I didn't get lift throttle oversteer. My last car was mid-engine though. Maybe that V-8 up front makes the difference.

What did surprise me was a little "tail wag" under heavy braking in PTM 2. I think that is do to alignment (I have the supplement's track alignment specs) allowing the car to move at the rear with pavement "waves" in a braking zone.

You have driven Mosport with those long corners, this is where I think slightly more rear slip could steer the car more neutrally. "Wagging the tail" braking into turn 4 there would be scary. That is where I would want an electronic nanny to look out for me.

In Sport2 and Race you can wag the tail completely out with sufficiently heavy braking (if desired) as there is nothing to actively correct excessive yaws. But, even sans Stabilitrak presence, it is worth noting that elsd does contrubute to overall stability both on entry ( thru its coast function) as well as exit (thru its drive function) and given how stable the car is mid corner its preload must be set to pretty safe spec. I think an excellent elsd calibration is why this car is so superbly stable even with all off.

As to Mosport you are right but i dont brake for T4 at all. It is just a tiny lift (mainly for the benefit of my brain) then back to maintenance throttle to keep the rear planted then hard on power when turning is mostly done while going down hill. Both T4 and slightly slower yet more memorable T2 are fantastic fast rollercoasters with blind entries. And require the same technique albeit t2 does require a touch of brakes while cresting the top.

[Flexhorn]

How much would Stabilitrak hinder a 1/4 mile run?

[TrackClub]

Originally Posted by Flexhorn

How much would Stabilitrak hinder a 1/4 mile run?

IMO zero as long as you go straight.

[TRZ06]

What I don't fully understand is if there is a difference in e-diff setting between Comp. mode and PTM "Sport 1" mode. Mode 4 for comp. mode says that stability is still a priority while giving you better exit speed.

HOWEVER Mode 3 for PTM "Sport 1" says the setting is for nimble turn-in.

Maybe because there is no traction control in comp. mode, it uses a less aggressive e-diff. setting that PTM Sport 1?

[TrackClub]

Originally Posted by TRZ06

What I don't fully understand is if there is a difference in e-diff setting between Comp. mode and PTM "Sport 1" mode. Mode 4 for comp. mode says that stability is still a priority while giving you better exit speed.

HOWEVER Mode 3 for PTM "Sport 1" says the setting is for nimble turn-in.

Maybe because there is no traction control in comp. mode, it uses a less aggressive e-diff. setting that PTM Sport 1?

Could very well be the case. I do think the e diff works differently in Sport 1 vs Race for example. I dont feel Stabilitrack kick in yet i cant quite rotate as freely on entry and mid corner for example.

[Clint455]

Just getting use to my new 2018 2SS 1LE. What does everyone use for regular street driving? When I feel like messing around I put it in Track mode then TC in Race mode. It allows the ass end to kick out moderately while making a turn before limiting power. I tried putting TC in Competitive Mode (press and holding TC button I think) and it's more fun for drifting, but obviously more dangerous. Normal driving I just put it in Track mode and leave TC on. Any reason why you'd drive around in Sport mode? Is there an ideal 'street' mode?

[Boost Creep]

Originally Posted by Clint455

Just getting use to my new 2018 2SS 1LE. What does everyone use for regular street driving? When I feel like messing around I put it in Track mode then TC in Race mode. It allows the ass end to kick out moderately while making a turn before limiting power. I tried putting TC in Competitive Mode (press and holding TC button I think) and it's more fun for drifting, but obviously more dangerous. Normal driving I just put it in Track mode and leave TC on. Any reason why you'd drive around in Sport mode? Is there an ideal 'street' mode?

Because streets in many areas are less than ideal.

I put the exhaust in track, set the main mode to sport, then activate competitive mode. If the roads get worse just switch to tour then back to sport when you are clear of the real bad section.
That's my ideal 'street' mode. Gives you access to all the power, but tries to keep you from going off into the woods backwards.

I tried PTM "dry", didn't do anything for me.
Used PTM "wet" while driving in some rain, and thought it worked great.
When you get up into sport1 and above it's track suspension.

Pennsylvania roads are complete garbage for the most part anywhere people live, so any track suspension setting gets annoying rather quickly if driving for any period of time.

[jeep_junkie]

Originally Posted by Clint455

Just getting use to my new 2018 2SS 1LE. What does everyone use for regular street driving? When I feel like messing around I put it in Track mode then TC in Race mode. It allows the ass end to kick out moderately while making a turn before limiting power. I tried putting TC in Competitive Mode (press and holding TC button I think) and it's more fun for drifting, but obviously more dangerous. Normal driving I just put it in Track mode and leave TC on. Any reason why you'd drive around in Sport mode? Is there an ideal 'street' mode?

Yeah if you read the more detailed responses in this thread, you will learn that the PTM race modes allow progressively higher degrees of rotation on WOT corner exit.

As for Competitive Mode, you can access that by pressing the TC button twice when the main driving mode is Sport. A prompt on the instrument cluster will let you know when it has been successfully activated. The TC light should stay on.

If you hold the TC button down, it turns off both Stabilitrak and TC and both lights will turn on. Be careful with this one - it turns all the nannies off.

Your 'ideal' street mode depends mainly on how you want the suspension to feel and the throttle to respond - the exhaust and steering can be manually adjusted from the driving mode menu in Settings. Tour suspension is marginally less choppy than Sport, but throttle mapping is the same - pretty aggressive. Track mode decreases throttle response for a more linear feel, and it also decreases steering assist. I don't find Track mode of much use on the street unless using one of the PTM race modes. Even that requires one to keep the gas pedal floored on corner exits, so it's kinda pointless unless you're driving really hard. For the street, I find street mode to be adequate as I can put the exhaust in whatever setting I want (usually the default setting) and occasionally hit the TC button to enter Competitive mode or to turn only the TC off completely by holding the TC button down.

[TRZ06]

Originally Posted by jeep_junkie

Yeah if you read the more detailed responses in this thread, you will learn that the PTM race modes allow progressively higher degrees of rotation on WOT corner exit.

As for Competitive Mode, you can access that by pressing the TC button twice when the main driving mode is Sport. A prompt on the instrument cluster will let you know when it has been successfully activated. Both stability control and traction control lights on the cluster will turn on too. Be careful with this one as it does turn ALL the nannies off.

Your 'ideal' street mode depends mainly on how you want the suspension to feel and the throttle to respond - the exhaust and steering can be manually adjusted from the driving mode menu in Settings. Tour suspension is marginally less choppy than Sport, but throttle mapping is the same - pretty aggressive. Track mode decreases throttle response for a more linear feel, and it also decreases steering assist. I don't find Track mode of much use on the street unless using one of the PTM race modes. Even that requires one to keep the gas pedal floored on corner exits, so it's kinda pointless unless you're driving really hard. For the street, I find street mode to be adequate as I can put the exhaust in whatever setting I want (usually the default setting) and occasionally hit the TC button to enter Competitive mode or to turn only the TC off completely by holding the TC button down.

Comp. Mode does not turn ALL nannies off. It turns off traction control, stabilitrak is fully 100% on still.

You need to hard hold for 5 seconds or more to turn everything off.

[jeep_junkie]

Originally Posted by TRZ06

Comp. Mode does not turn ALL nannies off. It turns off traction control, stabilitrak is fully 100% on still.

You need to hard hold for 5 seconds or more to turn everything off.

Yes, I stand corrected. Had it backwards.

[TrackClub]

Originally Posted by Clint455

Just getting use to my new 2018 2SS 1LE. What does everyone use for regular street driving? When I feel like messing around I put it in Track mode then TC in Race mode. It allows the ass end to kick out moderately while making a turn before limiting power. I tried putting TC in Competitive Mode (press and holding TC button I think) and it's more fun for drifting, but obviously more dangerous. Normal driving I just put it in Track mode and leave TC on. Any reason why you'd drive around in Sport mode? Is there an ideal 'street' mode?

For me an ideal street mode is the mode a car goes into each time you start it up. Read the original post on page 1 of this thread for a detailed explanation of each mode, its purpose etc. Cheers!

[Tachitup]

Hey TrackClub,

I just spent the last hour reading all 166 posts. Thanks for taking the time to educate us all on PTM. Well done my friend! Hope to see you at the track again sometime.

[TrackClub]

Originally Posted by Tachitup

Hey TrackClub,

I just spent the last hour reading all 166 posts. Thanks for taking the time to educate us all on PTM. Well done my friend! Hope to see you at the track again sometime.

Thanks! Well i needed to educate myself first so simply decided to share

We may see each other often next season if your bud John convinces me to go back to OTA lol!...3 Camaros in the series would be awesome. I may just do it but need to figure out logistics for first 2 events as i am usually still far away from Ont then...