What did you do with your 718 this week?

blueline · #111

The new forged Apex 19" SM-10RS wheels are now on the car along with new MSPC2 tires w/fronts up to 265/35 from OEM 245/35. It will make a difference. Fresh alignment. Soul Performance OAP's are installed. (The car sounds great!) From Flat 6, M-Engineering's M-Tuner Suite ECU tuning rec today. I'll have everything ready for a day at NCM this weekend. (Gonna be hot but what the heck - gotta give the new setup a whirl.)

: 2021 GT4 2023-08-21 Apex wheels #1.jpg (4.14 MiB) Viewed 1057 times

: 2021 GT4 2023-08-21 Apex wheels #2.jpg (2.61 MiB) Viewed 1057 times

J-Dub · #112

Looking good Tim! 265s look great on there, remind me please, how wide are your front wheels again?

It seems you are track ready!

With my PS4S tires I would aim to come off the track at 34-35 PSI on each tire. If it is was cool I would start at around 30, and if it was a hot afternoon I would start at 28 but adjust through the day as the PS4S definitely started to get greasy at 37 or so.

I assume the Cup2s are similar, curious what your experience will be. I just did some reading on the subject and some said a target of 29/33 is what they shoot for. I have not yet tried setting the fronts lower but that is on my list of things to try soon.

blueline · #113

Hi Jeremy,

Apex fronts are 19" x 9" and rears are 19" x 11". The front 5mm spacers come off when using the Apex wheels with the 265 tires.

Had the OEM 20" wheels straightened - they have had some slight out-of-round for awhile now from a lot of track use, not bad for non-forged wheels which is apparently what Porsche puts on the GT4. Corner cutting I guess. I put Michelin Pilot Sport 4 All-Season UHP's on the OEM's for winter off-track driving. Can use the car year-round now.

For track I start at 26 to 27 at all four corners but I think I'm going to try 28 this weekend and shorten the first outing if pressures get too high. Same as you, I'll use a bit higher starting out on cold days (45° or thereabouts). The 30 lbs that you use on cool days sounds about right.

When I come off track, I wait about 10-minutes and then bleed all four down to 29. I'll do the same routine a second or third time and then I am usually set. However, because NCM is so hard on left front tires, I am going to try keeping the left front a couple of pounds higher this weekend and see how the handling is and see if wear is lessened a bit on that tire.

I never like to be higher than 33 - 34 when the tires are at their hottest, although they occasionally get a bit higher and I can tell when that happens. The lowered pressures I like to run are probably contributing to faster wear. Just a guess. Don't know what to expect this weekend if I run the left front 2 lbs higher. I may just go up 1 or 1.5 lb. for the test.

Edit: I actually like to keep my tires at 32 when hot. 33 and up is more than I prefer but that might be better all things considered.

WillyDaP · #114

With the heat I would sure go back to your 26 or 27 lbs start as that was my go to pressure on a Mustang Mach 1 and years back a Viper ACR. With the weather beyond warm this weekend, I would stick to your regular pressures.

DomTheBomb · #115

I took my battery out of my GT4 because it ran out of juice and now I am waiting till labor day sale to cop a Lithium Battery

DomTheBomb · #116

blueline wrote: Mon Aug 21, 2023 9:11 pm The new forged Apex 19" SM-10RS wheels are now on the car along with new MSPC2 tires w/fronts up to 265/35 from OEM 245/35. It will make a difference. Fresh alignment. Soul Performance OAP's are installed. (The car sounds great!) From Flat 6, M-Engineering's M-Tuner Suite ECU tuning rec today. I'll have everything ready for a day at NCM this weekend. (Gonna be hot but what the heck - gotta give the new setup a whirl.)

2021 GT4 2023-08-21 Apex wheels #1.jpg

2021 GT4 2023-08-21 Apex wheels #2.jpg

What is the purpose of the tape lines, to line up the car in the mirrors as you park?

Treemagnet · #117

DomTheBomb wrote: Tue Aug 22, 2023 4:12 pm I took my battery out of my GT4 because it ran out of juice and now I am waiting till labor day sale to cop a Lithium Battery

Looking forward to seeing which battery brand and model you select.

blueline · #118

DomTheBomb wrote: Tue Aug 22, 2023 4:13 pm
blueline wrote: Mon Aug 21, 2023 9:11 pm The new forged Apex 19" SM-10RS wheels are now on the car along with new MSPC2 tires w/fronts up to 265/35 from OEM 245/35. It will make a difference. Fresh alignment. Soul Performance OAP's are installed. (The car sounds great!) From Flat 6, M-Engineering's M-Tuner Suite ECU tuning rec today. I'll have everything ready for a day at NCM this weekend. (Gonna be hot but what the heck - gotta give the new setup a whirl.)

2021 GT4 2023-08-21 Apex wheels #1.jpg

2021 GT4 2023-08-21 Apex wheels #2.jpg
What is the purpose of the tape lines, to line up the car in the mirrors as you park?

Lol. Yes, except I don't use the mirrors or backup cameras. I open my door and look down as I back up. All three garage spaces are marked for the cars they hold. No car of mine is left misaligned in its space!

The tape is a bit ragged looking - time to replace it. (Gaffer's tape - marvelous stuff.)

blueline · #119

@DomTheBomb

By the way, welcome to Carpokes!! Glad you found the site and glad that you signed up!

J-Dub · #120

Yes, please share which battery you have selected. The lithium battery selection seems like a minefield, quality is all over the board. Very tempting based on weight though.