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Old 05-05-2020, 09:20 PM   #1
BDPhoto519
 
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305/45/17 ET Street R Tire Pressure?

Just picked up my RaceStars & 305/45/17 ET Street R's today

Was curious what kind of air pressure everyone is finding works best. Seems like a lot of people I talked to are running in the 18-21psi range.

Unfortunately the tracks are not open here yet, so street tuning and Dragy #'s is the best I have to work with for now.

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Old 05-06-2020, 05:22 PM   #2
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Yea... all closed down here as well! You want to run as much air as you c an in them... My power level I run 18Lbs with a 1.42 60Ft. Same exact tire I run!
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Old 05-07-2020, 03:53 PM   #3
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Yea... all closed down here as well! You want to run as much air as you c an in them... My power level I run 18Lbs with a 1.42 60Ft. Same exact tire I run!
Thanks 2018ZL1,

Yeah that's the plan, probably start around 18 and work my way up until i start to see the 60's drop. Was just curious what everyone else was running on these cars.

Hopefully the tracks open soon!
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Old 05-07-2020, 04:43 PM   #4
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I'm running Hoosier, but they could be relative. Last time I ran, I was dead hooking with 24. I've mostly ran 18 to 20. All depends on the track prep and conditions.
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Old 05-08-2020, 09:43 AM   #5
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Around 20 was what I found to hook the best at the track, I run them at 25 on the street.
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Old 05-08-2020, 01:42 PM   #6
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My best 60 ft is 1.35 with the same tire on 19 psi.
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Old 05-08-2020, 07:56 PM   #7
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Thanks gents,

The temps dropped here the past day or so out of the blue, we actually got some flurries this morning. So will have to give it a few days to warm back up again so I can make a run to Mexico and give these a try...
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Old 05-08-2020, 10:26 PM   #8
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Is anyone changing the tire size scaling in HPTuners to keep all the mph/etc in proper calibration when running the DR's vs Street tires?

I haven't physically measure the height difference between the stock wheels, although I'm sure it close.
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Old 05-09-2020, 12:02 PM   #9
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Originally Posted by BDPhoto519 View Post
Is anyone changing the tire size scaling in HPTuners to keep all the mph/etc in proper calibration when running the DR's vs Street tires?

I haven't physically measure the height difference between the stock wheels, although I'm sure it close.
305/45/17 is a 28 inch tire just like whatever the stock 20s have on them.

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Old 05-09-2020, 12:46 PM   #10
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Quote:
Originally Posted by BDPhoto519 View Post
Is anyone changing the tire size scaling in HPTuners to keep all the mph/etc in proper calibration when running the DR's vs Street tires?

I haven't physically measure the height difference between the stock wheels, although I'm sure it close.
I had that same tire before and there is no question that it's taller than the stock SS tire. Made the unadjusted speedometer read lower.
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Old 05-09-2020, 03:25 PM   #11
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Quote:
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I had that same tire before and there is no question that it's taller than the stock SS tire. Made the unadjusted speedometer read lower.
Yeah I haven't measured the difference yet, but guessing its slightly taller.

I am not too worried about the speedo being off, but alot of the trans related stuff like shift points are based off mph I believe so I would like to keep it consistent.
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Old 05-09-2020, 03:43 PM   #12
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I'm not sure what you guys are talking about but a 305/45/17 is a 28 inch tire just like the stock 20s. If it is different it is by a very small percentage like .20 or something and won't affect the speedo enough to even worry about.

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Old 05-09-2020, 03:47 PM   #13
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I just looked it up and the stock tire is 27.58 and the 305/45/17 is 27.8 which is not enough difference to even notice.

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Old 05-10-2020, 01:16 AM   #14
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Quote:
Originally Posted by Umbriel View Post
I just looked it up and the stock tire is 27.58 and the 305/45/17 is 27.8 which is not enough difference to even notice.

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Thanks Umbriel,

I appreciate the info!
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