? about 27" QTP's
Thread Starter
TECH Apprentice
Joined: May 2002
Posts: 392
Likes: 0
From: Savage, MD
? about 27" QTP's Next season I will be getting a Moser rear with 4:10's and i was wondering if I will be hitting the rev lmiter with a 27" tire. Or will have to get a 26". I will only have bolt ons but after I go 11's I want to put a cam in my car.
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: ? about 27" QTP's 6500 RPM on a 27" tire with a 4.10 gear maxes out to only 127 MPH. A 4.30 gear would net about 121 MPH.
Here's the formula you can use, it's reasonable. Just plug it into a nice excel spreadsheet and you can figure out a lot of stuff like this. You can use the tire_diam to take a street tire size and figure out the diameter (275 45 R17 is something like 26.7").
mph = ((rpm * tire_diam) / (gear_ratio * axle_ratio * 336.1352398))
tire_diam = width / 25.4 * (aspect/100) * 2 + diam
Here's the formula you can use, it's reasonable. Just plug it into a nice excel spreadsheet and you can figure out a lot of stuff like this. You can use the tire_diam to take a street tire size and figure out the diameter (275 45 R17 is something like 26.7").
mph = ((rpm * tire_diam) / (gear_ratio * axle_ratio * 336.1352398))
tire_diam = width / 25.4 * (aspect/100) * 2 + diam
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: ? about 27" QTP's 4.10's on a 26" tire is about 122 MPH. I'm debating about moving to a 27" tire for some more sidewall on a 4.30 which will net the same 122MPH as the 4.10 on a 26.
Yes you should move this to the drag racing forum. You'll get some better responses.
Yes you should move this to the drag racing forum. You'll get some better responses.
