[Co2SS]

And I have a few quick questions.

—Is it necessary, and if so, how do y’all keep soapy water from pouring into the heat extractor and all over the engine when you wash the car? Or did they design it right to drain well and not drench your engine?

—First supercharged car….does the supercharger always run? Or is it based on either RPM and/or throttle percentage? Just curious if driving very conservatively keeps the supercharger from boosting, thus saving any gas? Not that I would be driving very conservatively, very often.

—What do y’all do to keep the Alcantara clean? Anyone wear driving gloves to keep hand sweat/grease off of the steering wheel and gear shift?

—Is the “pulling timing” issue really that common in the car as some make it seem when driven in hot temps? It can be quite hot here in the summer and I never had problems with that in my SS so it would be quite disappointing to have it happen in this car.

—Anyone switch to Michelin PS4S? And how do they compare to the GY F1 Supercars, particularly in summer rain conditions?

I’m sure I will have more questions and you guys are always great about having all the answers.
Here are a couple of quick pics for the ZL1 lovers. I will post better ones in the coming day or 2 after I pick her up tomorrow morning after the LPO items and tint are installed.

[Walkure]

I have the PS4S. They seem to perform just as well for daily driving. But they last a lot longer than the Goodyears.
Nice car. Welcome to the club.

[CW3SF]

Welcome!
- The soapy water drains out without getting all over your engine and under hood parts
- The supercharger runs all the time but boost level stays low when you drive normally
- You can find alcantara cleaning kits online. Amazon is a good place to start your search
- It is likely that your car will pull timing in extreme heat. It won’t affect your day to day driving. You’ll only notice it if you are at the drag strip, road course or street racing. You can upgrade the cooling system to help with that
- The MPS4 tires will be a life saver if you drive the car in the rain. The SC3s are dangerous in cold or wet


Great looking car. Congrats!

[LT4Greg]

Congratulations and you will love that new hotrod. Yes the supercharger runs all the time and water does drain to the front of the engine. When you open the hood you will see 2 vents that drain the water near the front of the hood. The micro suede will wear and get dirty especially on the steering wheel and shifter knob. Be sure to use either 92 or 93 octane gasoline and of course that depends on where you live if it’s available for maximum performance.

[arpad_m]

Originally Posted by Co2SS

—First supercharged car….does the supercharger always run? Or is it based on either RPM and/or throttle percentage? Just curious if driving very conservatively keeps the supercharger from boosting, thus saving any gas? Not that I would be driving very conservatively, very often.

It is belt driven, so technically it is always running, but it has a bypass valve that allows, well, the air to bypass the supercharger, so you are not always in boost (watch your boost gauge in the cluster).

Although I have a supercharged SS with AFM disabled, not a ZL1, it's a somewhat similar setup with more power, yet fuel economy can still be good and reach high twenties despite that. Only in grandma mode, of course.

[hawk02]

I'll add that the PS4S have a softer sidewall compound than the Goodyears. This means they don't get as hard as a rock in cold temps but it also means they're not as good for track use. If you jump on the throttle you'll get a little more wiggle out of the back end with the PS4S. As others have mentioned, they're much more stable in the rain.

As far as pulling timing in hot weather, it's the downside of forced induction. These engines definitely DO NOT like compressed HOT air. I estimate a drop of 25-50 horses on a 90 degree day with 100% humidity. NA engines aren't as affected by the ambient temperatures as FI engines. I never realized how much ambient temps affect performance until I owned two supercharged cars. 50-60 degree ambient temps seems to be the sweet spot for these engines. You'll feel the difference right away compared to driving in 80-90 degree temperatures.

[Co2SS]

Thanks for all the good info guys! Ready to get out and break it in!

[WhiteMale]

SC3 are tremendous tires but they'll scare the hell out of you in the rain or hit a puddle/ standing water, etc above about 40mph...you'll white knuckle it.

[Gunkk]

Originally Posted by Co2SS

And I have a few quick questions.

1. —Is it necessary, and if so, how do y’all keep soapy water from pouring into the heat extractor and all over the engine when you wash the car? Or did they design it right to drain well and not drench your engine?

2. —First supercharged car….does the supercharger always run? Or is it based on either RPM and/or throttle percentage? Just curious if driving very conservatively keeps the supercharger from boosting, thus saving any gas? Not that I would be driving very conservatively, very often.

3. —What do y’all do to keep the Alcantara clean? Anyone wear driving gloves to keep hand sweat/grease off of the steering wheel and gear shift?

4. —Is the “pulling timing” issue really that common in the car as some make it seem when driven in hot temps? It can be quite hot here in the summer and I never had problems with that in my SS so it would be quite disappointing to have it happen in this car.

5. —Anyone switch to Michelin PS4S? And how do they compare to the GY F1 Supercars, particularly in summer rain conditions?

1. Don't worry. Water will not drip on the engine. The rain deflector works as intended.
2. The SC is belt driven off the crank, always spins. Boost is a factor of RPM and throttle position (mostly RPM). You didn't just ask about gas mileage, did you?! No? Didn't think so.
3. Sonax Alcantara Cleaner. For example: https://www.camaro6.com/forums/showp...postcount=6402
4. Not as long as you have high enough octane gas. IIRC "regular" gas in CO is like 85 or something really low. Stick with the recommended 93.
5. I will be this coming wet season as my 4yo OEMs are mostly slick after 9k miles. Not worth the risk if I get caught in rain coming home from a show/cruise-in/meet. MPS4S are the best wet+street tire for our cars. The OEM Goodyears will try to kill you in rain. If you daily the car, swap the tires. You can sell the OEMs easily here.

Congrats on the new ride!

[lenix38]

Replace the tires. They are dangerous in the rain, and even daily driving. They need a lot of heat. I switched them out to Continental Extreme Contact Sports. Love that tire. Also had PS4 in my Z06, they were good as well. Just wanted to try the Contis and glad I did. Enjoy the car it’s a blast.

Also I would get the front end ppf’d ASAP.

[Idaho2018GTPremium]

I wipe the Alcantara with a damp clean microfiber cloth. So far so good, but only 3,400 miles so far on my '21 ZL1 and I don't drive with dirty hands, so it all still looks brand new.

I've had Michelin PS4S and they are just as bad in cold as the GY Supercar 3 tires. Neither are good at cold weather. The PS4S may last longer than the SC3, but the PS4S tires are ~$180 more expensive in the 305/30/20 size. So, they have to last a while longer to cover the extra cost. I would go with the OEM Goodyears over the PS4S. If you switch to PS4S let me know, I may buy your OEM Goodyears if they can be shipped to Boise for a reasonable cost.

It's true that there's a large power difference between hot and cool weather in the ZL1. But even at 95 F it doesn't feel slow. It just feels more powerful at 50-60F. It feels like an angry monster at 40 F. Hot air hurts forced induction cars more than N/A unless they have massive intercooler capability, but elevation hurts NA cars more than FI, so it's a trade-off.

[pauly1119]

Congrats!! PS4S are a must for regular driving. Save the GR's if you plan on tracking if not they will sell quickly for good money.

[arpad_m]

Originally Posted by Idaho2018GTPremium

I've had Michelin PS4S and they are just as bad in cold as the GY Supercar 3 tires. Neither are good at cold weather. The PS4S may last longer than the SC3, but the PS4S tires are ~$180 more expensive in the 305/30/20 size. So, they have to last a while longer to cover the extra cost. I would go with the OEM Goodyears over the PS4S. If you switch to PS4S let me know, I may buy your OEM Goodyears if they can be shipped to Boise for a reasonable cost.

My PS4S tires are actually very reasonable in the cold, down to 40 °F and a bit under, when the tire temp indicator is permanently stuck in the COOL zone. Not sure what constitutes "good" in your book, of course I don't go crazy with the throttle in such cold weather, but the tires do hold some power in a straight line and even in turns.

[Idaho2018GTPremium]

Originally Posted by arpad_m

My PS4S tires are actually very reasonable in the cold, down to 40 °F and a bit under, when the tire temp indicator is permanently stuck in the COOL zone. Not sure what constitutes "good" in your book, of course I don't go crazy with the throttle in such cold weather, but the tires do hold some power in a straight line and even in turns.

I had the OEM PS4S on my 2018 GT PP1 w/ MagneRide, and those tires below about 45-48 F ambeint temperatures were downright dangerous.

I have multiple examples:

In cold weather, say upper 30s (but the car being in the 50 F garage all night), there is a stop sign about 1 min away where I have to turn right onto a main road. No matter how lightly I pressed the throttle, the rear tires would spin slightly during the turn.

Prior to warming up the tires, when trying to do a U turn in 40 F my car slid laterally at least 3-4 feet in the middle of the U turn, despite going very slowly (probably around 5-6 mph).

In 40 F weather, if the tires weren't warm, they would spin with only ~half throttle at 70 mph on the freeway. With the N/A light bolt on Coyote DOHC engine no less.

They were like hockey pucks. Downright terrible in the cold. I'd say at this point, the OEM SC3 on my ZL1 have been less scary than the PS4S in moderately cold weather. I can't imagine ever putting PS4S on a ZL1 if one was going to drive in moderately cold weather (i.e., 35-45 F).