Rainier42
Well-Known Member
- Joined
- Mar 14, 2016
- Threads
- 19
- Messages
- 153
- Reaction score
- 61
- Location
- Bucks County, PA
- Vehicle(s)
- 2019 Performance Blue GT350R
Just a quick tire update on my results from the last two track events.
Notes -
1. This is non-scientific testing. Conditions varied slightly between each session and this was the second visit on this particular course direction and layout with the vehicle. I am not here to recommend one brand over another. I tend to favor certain tires based on my driving style and it means a different tire might work better for another driver.
2. I am not the quickest driver, but turn very consistent lap times rarely varying more than a few tenths of a second in open traffic conditions.
3. The car has more in it than I capable of extracting at the moment. I hope that changes as I become more familiar with it over the next couple of months. So results could, probably would vary with a better driver.
4. Each set of tires tested were on the stock TP wheels with each set having a run in the morning and afternoon sessions.
5. Each set of non-OEM (PSS) tires were heat cycled before delivery and had an average of 50 miles of driving on them before track time. I realize additional mileage would make a difference on the tires tested, but all started equal as delivered.
6. Car Setup -
a. 2016 GT350 TP / Track Mode setting
b. Modifications - Steeda 2-point G-Trac Front Brace, MM CC plates, Steeda IRS subframe braces, Steeda IRS subframe alignment kit, Steeda Ultra Light Jacking Rails, FTBR IRS Vertical Links, FTBR IRS Toe Links, and FRPP differential bushing Kit. I will upgrade the IRS upper/lower control arm and subframe bushings next month with the FTBR parts.
c. Front Camber: -1.9, Front Caster: 7.00, Front Toe Total - 0.05 In
d. Rear Camber: -1.3, Rear Toe Total - -0.30 In
e. Car was corner weighted during the alignment process.
7. Tires tested included the stock Pilot Super Sports, Pilot Sport Cup 2, Bridgestone RE-71R and the Hankook R-S3 v2 on the stock TP wheels. Sizes are listed with the time differentials.
8. Test Conditions-
a. Ambient Temps - 97~99F
b. Took the afternoon times and averaged the three best laps in clear traffic conditions.
c. Course was a 1.7 mile layout with 11 turns. Testing next week will be on the same track, but a 3.1 mile layout with 16 turns in the opposite direction. I was able to secure some guest time the day before the event and will test the MSPP and RE-71R on the stock wheels as baselines against the next setup, but more importantly to compare the time differentials on a longer track. Once again, non-scientific as the wheels, rear tire sizes and brake pads will be switched along with the new tires at the next event.
Times -
1. Lap differentials are based off a baseline of Zero with the stock wheel/tire setup, but with the suspension mods listed above.
A. Michelin Pilot Super Sport, F-295-35-19, R-305/35/19 - Baseline
B. Hankook R-S3 v2, Front/Rear 305/30/19 -1.97 seconds
C. Bridgestone RE-71R, Front/Rear 305/30/19 -2.24 seconds
D. Michelin Pilot Sport Cup 2, Front/Rear 305/30/19 -2.41 seconds
Hot Tire Pressures -
1. Based on fine tuning over the weekend.
A. Michelin Pilot Super Sport, F-36 R-35
B. Hankook R-S3 v2, F-34 R-33
C. Bridgestone RE-71R, F-35 R-33
D. Michelin Pilot Sport Cup 2, F-34 R-33
General Comments-
Add tomorrow.
Bridgestone RE-71R Images-
1. After eight track sessions over two course events and 1100 highway miles.
Did you find that the 305/30/19 Cup 2 tires fit on the front stock wheels well and without rubbing? Was your speedo thrown off at all due to difference in rear size or did you compensate?
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