Best Track Times in a GT4
02-15-2018, 03:32 PM
#1126
Rennlist Member
Thread Starter
!
02-15-2018, 06:09 PM
#1127
Rennlist Member
The 1:33 is on "Big Willow" the track considered one of the fastest tracks in the US per avg lap speeds. Its an experience in courage 130mph turn-in on a bumpy track is something else, but very fun. I'm headed back to the both tracks May and June to drop my times
The 1:33 was done on Michelin Cup 2's. The car has DSC Sport, Tarret Clubsport "A" package which is front bump steer, rear toe links, 16mm shims, and front caster pucks (which I didnt use). The car is lowered. -3.1 front camber / -2.7 rear. Zero front toe, 4mm rear toe. Braille 15lbs battery, Tillett B5 seats (they're works of art and extremely light), and track exhuast (rear mufflers deleted). Stock pads (going to PFC in March)
02-18-2018, 04:49 PM
#1128
My all stock GT4 except with Kumho Ecsta PS91 street tires...I wish I had more grip! 
I ran a 2:28 on lap 3 (my personal best so far) at Sebring today in solo blue with Chin.
^That was a track-prepped CTSV w/ the 650hp LT4 in front of me... eventually caught up and got a point-by later in lap 4.
I ran a 2:28 on lap 3 (my personal best so far) at Sebring today in solo blue with Chin.
^That was a track-prepped CTSV w/ the 650hp LT4 in front of me... eventually caught up and got a point-by later in lap 4.
Last edited by Bossing; 02-18-2018 at 11:45 PM.
02-19-2018, 02:25 AM
#1129
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Originally Posted by Bossing
My all stock GT4 except with Kumho Ecsta PS91 street tires...I wish I had more grip!
I ran a 2:28 on lap 3 (my personal best so far) at Sebring today in solo blue with Chin.
^That was a track-prepped CTSV w/ the 650hp LT4 in front of me... eventually caught up and got a point-by later in lap 4.
I ran a 2:28 on lap 3 (my personal best so far) at Sebring today in solo blue with Chin.
^That was a track-prepped CTSV w/ the 650hp LT4 in front of me... eventually caught up and got a point-by later in lap 4.
Info@rennsport-one.com
__________________
02-25-2018, 11:03 PM
#1131
Rennlist Member
Thread Starter
We saw your GT4 our there today and your car looked beautiful . If you are looking for alittle more grip, shoot us an email and I will be able to help you utilize some of the components on your GT4 alittle better and make your track experience even that more pleasant
Info@rennsport-one.com
Info@rennsport-one.com
Congratulations on your win at Daytona this year - the No 28 RS1 GT4 Clubsport was awesome! Made Porsche owners proud! Those "no-name" drivers said the win was 'cause you'll cracked the code this winter on setting up the Cayman run its best! Just kidding about the drivers - it was special to watch them drive. Spencer Pumpelly and Dillon Machavern are wicked fast.
Can I lean on you a bit and ask you to share some of your thoughts of what makes your Cayman so fast?
I no nothing about setting up a race car, but from purely an onlookers perspective, it appeared the RS1 Cayman had a certain amount of extra body roll up to a point, and then it was glued to the track - as if Spencer could put it on its edge and then simply carve through the corner with extreme confidence. Tell us please!!!
02-28-2018, 11:45 AM
#1132
Road Atlanta - 1:40.99 - First time at RAT, Bridgestone RE71-R Tires. 2-24-18
https://www.youtube.com/watch?v=vLBt...ature=youtu.be
Sebring - 2:27.98 - 1-27-18 - Bridgestone RE71-R Tires.
https://www.youtube.com/watch?v=vLBt...ature=youtu.be
Sebring - 2:27.98 - 1-27-18 - Bridgestone RE71-R Tires.
03-02-2018, 10:48 PM
#1133
Here is my best lap at Chin COTA HPDE this weekend.
2m27.19s (ambient temp: 57F)
OE size RE71R (245,295), DSC V2 PASM controller, Fabspeed rear wing riser (new!), all stock other than that. ARB setting is mid/firm.
Wasn't able to match jslee225's lap time so hats off to him!! If I was able to combine everything together I could see 27 flat but it didn't happen this time.
Another thing i need to confess is that I changed S/F line to back stretch for my optimal lap... Here is why. On my first hot lap, one GT3 just outpit in front of me and even went wide at exit so I had to go off the track... Next lap, I got a big sideways at T3 (the track had more undulation than last time I drove in March last year). The following lap was almost 0.4 sec ahead until backstretch but caught a slow traffic... After that, the tires lost some grip so my session was over. The next session was kind of similar condition but I wasn't able to make a hotlap since I needed to come back to be a check ride instructor.
Here is a video starting before normal S/F until 2nd lap back stretch.
https://youtu.be/RJEkz8K1K-U
The rear riser made the car absolutely planted more at high speed corners and the balance wasn't too bad until front tire gets hot. As my front tires are still the one used at TWS last year (swapped left and right for even wear though), it didn't grip very much at large slip angle so maybe it's better balance with a new set (rear was used for MSR Cresson and H2R then being swapped). Also I did some back to back PASM controller comparison during the event (DSC vs stock). I didn't see much difference for single corner but DSC had smoother lateral transition especially at esses.
2m27.19s (ambient temp: 57F)
OE size RE71R (245,295), DSC V2 PASM controller, Fabspeed rear wing riser (new!), all stock other than that. ARB setting is mid/firm.
Wasn't able to match jslee225's lap time so hats off to him!! If I was able to combine everything together I could see 27 flat but it didn't happen this time.
Another thing i need to confess is that I changed S/F line to back stretch for my optimal lap... Here is why. On my first hot lap, one GT3 just outpit in front of me and even went wide at exit so I had to go off the track... Next lap, I got a big sideways at T3 (the track had more undulation than last time I drove in March last year). The following lap was almost 0.4 sec ahead until backstretch but caught a slow traffic... After that, the tires lost some grip so my session was over. The next session was kind of similar condition but I wasn't able to make a hotlap since I needed to come back to be a check ride instructor.
Here is a video starting before normal S/F until 2nd lap back stretch.
https://youtu.be/RJEkz8K1K-U
The rear riser made the car absolutely planted more at high speed corners and the balance wasn't too bad until front tire gets hot. As my front tires are still the one used at TWS last year (swapped left and right for even wear though), it didn't grip very much at large slip angle so maybe it's better balance with a new set (rear was used for MSR Cresson and H2R then being swapped). Also I did some back to back PASM controller comparison during the event (DSC vs stock). I didn't see much difference for single corner but DSC had smoother lateral transition especially at esses.
I was at cresson last weekend, and man that track is tough when it's wet...on hoosiers.
There is always more cars
03-03-2018, 10:04 PM
#1134
Rennlist Member
Road Atlanta - 1:40.99 - First time at RAT, Bridgestone RE71-R Tires. 2-24-18
https://www.youtube.com/watch?v=vLBt...ature=youtu.be
Sebring - 2:27.98 - 1-27-18 - Bridgestone RE71-R Tires.
https://www.youtube.com/watch?v=vLBt...ature=youtu.be
Sebring - 2:27.98 - 1-27-18 - Bridgestone RE71-R Tires.
I'm still not as fast a Sportlife, but getting better.
Here's 20min of passing 20 BMWs
03-04-2018, 12:36 AM
#1135
Rennlist Member
Thread Starter
The 1:26 was at Streets of Willow (the small track). Randy Probst did a 1:21 during a GT4 track test for comparison. Figuring he's a pro and I was on bad rubber I like my chances for improvement.
The 1:33 is on "Big Willow" the track considered one of the fastest tracks in the US per avg lap speeds. Its an experience in courage 130mph turn-in on a bumpy track is something else, but very fun. I'm headed back to the both tracks May and June to drop my times
The 1:33 is on "Big Willow" the track considered one of the fastest tracks in the US per avg lap speeds. Its an experience in courage 130mph turn-in on a bumpy track is something else, but very fun. I'm headed back to the both tracks May and June to drop my times
Nice, on the board!
Road Atlanta - 1:40.99 - First time at RAT, Bridgestone RE71-R Tires. 2-24-18
https://www.youtube.com/watch?v=vLBt...ature=youtu.be
Sebring - 2:27.98 - 1-27-18 - Bridgestone RE71-R Tires.
https://www.youtube.com/watch?v=vLBt...ature=youtu.be
Sebring - 2:27.98 - 1-27-18 - Bridgestone RE71-R Tires.
Nice lap for your first time at Road ATL!
I'm still not as fast a Sportlife, but getting better.
Here's 20min of passing 20 BMWs
https://youtu.be/Rn7WVyELoBU
I'm still not as fast a Sportlife, but getting better.
Here's 20min of passing 20 BMWs
https://youtu.be/Rn7WVyELoBU
03-05-2018, 08:23 AM
#1136
Rennlist Member
03-06-2018, 12:15 AM
#1138
Was at COTA this weekend and lucked upon a fast lap. It's worse driving and in traffic, but it was much colder than my previous best - so car was stronger and muscled its way to a faster lap.
Comparison (red) to previous best (blue). You can clearly see the impact of the cold temps on power in the straights. Pretty much everywhere I was driving at a lower pace...but power made up for it.
Comparison (red) to previous best (blue). You can clearly see the impact of the cold temps on power in the straights. Pretty much everywhere I was driving at a lower pace...but power made up for it.
03-06-2018, 07:04 PM
#1139
Rennlist Member
Nice clean and smooth lap!
03-06-2018, 07:17 PM
#1140
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Was at COTA this weekend and lucked upon a fast lap. It's worse driving and in traffic, but it was much colder than my previous best - so car was stronger and muscled its way to a faster lap.
https://youtu.be/cvndaOGzRaY
Comparison (red) to previous best (blue). You can clearly see the impact of the cold temps on power in the straights. Pretty much everywhere I was driving at a lower pace...but power made up for it.
https://youtu.be/_yTxJ_QV3lQ
https://youtu.be/cvndaOGzRaY
Comparison (red) to previous best (blue). You can clearly see the impact of the cold temps on power in the straights. Pretty much everywhere I was driving at a lower pace...but power made up for it.
https://youtu.be/_yTxJ_QV3lQ
