The R/T tires are about 29 inches tall while a stock 15 in setup is around
28 inches tall. This nets about a 3.5% reduction in gearing. The R/T
tire/wheel is about 15 pounds heavier(apiece) than the 15" combo. This
requires more power to overcome the rotational inertia. I also agree about
the shorter sidewall flexing less, which can lead to more wheel spin. A
headwind MAY also slow you down. My rationale, depending on the direction
of the staging lanes/engine run time while waiting, the wind direction may
allow for better engine cooling while waiting.
FYI: My 98 5.2 5spd R/C will 60 around 2.19-2.2 (275/60/15 street tires),
or 1.89-1.93 28" (M/T slicks), while my 2000 R/T will 60 around 2.17-2.19
stock tires or 1.93-1.96 with the same 28" slicks on a 15x8 Dakota rim.
TonyC
-----Original Message-----
From: Woodruff, Jason P <Jason.Woodruff@West.Boeing.com>
To: DML (E-mail) <dakota-truck@buffnet.net>
Date: Thursday, May 31, 2001 12:32 PM
Subject: Re: DML: Disapointment at the track last night, need advice
>I think it was just a bad night. Wind and humidity really slow you down.
>
>Yes taller tires give you a bigger gear ratio which slows you down also.
>
>How was you traction this time compared to last?, check your 60ft times.
>The R/T wheel and tire combo gives less sidewall flex, which can lead to
>less traction off the line. The I don't know what your old combo was, but
>the new wheel/tire set up is probably heavier, and therefore harder to get
>rolling.
>
>Jay W
>4.7L Auto Sport+ C.C. 2wd Black
>Mods Profile page at
>http://www.twistedbits.net/WWWProfile/dakota/Re5X8z5la@Ix2/profile.htm
>
>
>>Date: Thu, 31 May 2001 09:44:21 -0400
>>From: "Dakota R/T QC" <thegrants@snet.net>
>>Subject: DML: Disapointment at the track last night, need advice
>>
>>Hi all, 2k QC 4.7 5spd. 3.55. LSD
>>I was a little disappointed last night at the drag strip.
>>My best pass was a 15.89 at 84 mph.
>>The reason i am not happy is when my truck was stock i ran a 15.85@ 84
mph.
>>Now i have a Jet stage 2, intense performance stage 2, bosch 4417 +4, 180
t
>>stat and a Gibson single side swept.
>>What gives?
>>I think 2 things could be a factor.
>>1. I put R/T wheels and tires. They are 1 inch taller that my stock tires,
>>that would change the gear ratio?
>>2. There was a pretty good head wind last night plus it was pretty damp.
>>
>>What do you all think?
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:01:37 EDT