Proper Pressure: Sumitomo HTRZ III Street Driven
06-20-2017, 11:24 AM
#1
Proper Pressure: Sumitomo HTRZ III Street Driven
I've recently pulled my '04 6GT3 out of storage for the season and wanted to determine the proper tire pressures for the HTRZ's, cold.
The car (somewhat tragically) will be exclusively street-driven.
I went with the recommended pressures from under the fuel-filler door (32/38 if memory serves) but not convinced that's the best set-up.
Is there a generally accepted "correct" set of pressures I should use?
The car (somewhat tragically) will be exclusively street-driven.
I went with the recommended pressures from under the fuel-filler door (32/38 if memory serves) but not convinced that's the best set-up.
Is there a generally accepted "correct" set of pressures I should use?
Last edited by UpOnTheWheel; 06-27-2017 at 12:40 PM. Reason: updated type-oh (28 to 38)
06-20-2017, 11:30 AM
#2
Rennlist Member
A little harsher ride but to protect rims on street I run 34F 40R on mine.
06-21-2017, 10:52 AM
#4
Racer
I find 39r to be way too high. Rear jumps all over the place. Drives nicely on 32f/33r on my AD08R. Here's an old thread: https://rennlist.com/forums/996-gt2-gt3-forum/928711-996-gt3-oem-tire-pressure-vs-actual-street.html
06-21-2017, 02:52 PM
#5
Race Car
I run sumitumo's on the street with 32/36 as pressures and they work just fine.
Unless you're running auto-x I don't get the guys who run super sticky rubber on the street, the limits of the car are already high enough.
I was on a spirited drive with a couple of cars shod with NT-01's on the street last weekend and had no issues keeping pace with my lowly Sumitumo's.
Unless you're running auto-x I don't get the guys who run super sticky rubber on the street, the limits of the car are already high enough.
I was on a spirited drive with a couple of cars shod with NT-01's on the street last weekend and had no issues keeping pace with my lowly Sumitumo's.
06-21-2017, 03:31 PM
#6
I run sumitumo's on the street with 32/36 as pressures and they work just fine.
Unless you're running auto-x I don't get the guys who run super sticky rubber on the street, the limits of the car are already high enough.
I was on a spirited drive with a couple of cars shod with NT-01's on the street last weekend and had no issues keeping pace with my lowly Sumitumo's.
Unless you're running auto-x I don't get the guys who run super sticky rubber on the street, the limits of the car are already high enough.
I was on a spirited drive with a couple of cars shod with NT-01's on the street last weekend and had no issues keeping pace with my lowly Sumitumo's.
06-21-2017, 04:13 PM
#7
Rennlist Member
I run sumitumo's on the street with 32/36 as pressures and they work just fine.
Unless you're running auto-x I don't get the guys who run super sticky rubber on the street, the limits of the car are already high enough.
I was on a spirited drive with a couple of cars shod with NT-01's on the street last weekend and had no issues keeping pace with my lowly Sumitumo's.
Unless you're running auto-x I don't get the guys who run super sticky rubber on the street, the limits of the car are already high enough.
I was on a spirited drive with a couple of cars shod with NT-01's on the street last weekend and had no issues keeping pace with my lowly Sumitumo's.
After two purchases of Kumhos (20K+ miles) I splurged and went back with PS2s. I never want to go back to Kumho!
I know PS2s are pricy compared to Sumitumos or other bargain brands, but the ride, cornering, braking, and more important - wet weather performance of the PS2s is a no-brainer.
Again, these are all street miles I do on my GT3 and I have 120,000 of them on all kinds of rubber, most of that on Michelin or Yokohama.
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06-26-2017, 07:33 PM
#9
Rennlist Member
LOL
I guess it depends on how you use the car. I installed a set on street wheels since my car sees some street (mainly driving to the track) and I didn't want to be ruining expensive track tires with a ton of neg camber... ended up doing some DE on them at WGI (don't ask) - yes, they screamed like the little sissies they are, but they survived and did not chunk. Probably due to the slide and lack of grip.
Anyway, at $500 a set, they serve their purpose for me as 'sacrificial' tires. If I had a street alignment, I'd get a better tire though. And honestly, just for tooling around on the street, they're fine. If you are lacking street grip on Sumis, you're probably Droving Too Fast.
Cheers
Matt
I guess it depends on how you use the car. I installed a set on street wheels since my car sees some street (mainly driving to the track) and I didn't want to be ruining expensive track tires with a ton of neg camber... ended up doing some DE on them at WGI (don't ask) - yes, they screamed like the little sissies they are, but they survived and did not chunk. Probably due to the slide and lack of grip.
Anyway, at $500 a set, they serve their purpose for me as 'sacrificial' tires. If I had a street alignment, I'd get a better tire though. And honestly, just for tooling around on the street, they're fine. If you are lacking street grip on Sumis, you're probably Droving Too Fast.
Cheers
Matt