![SEARCH](http://www.mustangworks.com/images/search.png)
![The Mustang Works](http://www.mustangworks.com/images/mw_footer_logo.gif)
© Copyright 1995 thru 2008 - The Mustang Works™. All Rights Reserved.
MustangWorks.com is designed and hosted by Aero3 Media.
MustangWorks.com is designed and hosted by Aero3 Media.
![]() |
#1 |
Registered Member
Join Date: Sep 2002
Location: cent.wis
Posts: 203
|
![]() I was thinking that my 4.10's are going to be too much for my c4 and 26 inch tall M/T's. I was going to run a 5spd but changed my mind after putting in the 4.10's. I want to keep around 6k at the finish line. Would going to a 28inch tall tire help that much? I guess I just need to run it a little then figure it out. just curious though. tfs trackheats,tfs stage2, victor jr, 650carb etc.....
|
![]() |
![]() |
![]() |
#2 |
Moderator
Join Date: Sep 1998
Location: Grand Rapids, Michigan, USA
Posts: 1,001
|
![]() I would figure out how much horsepower you're making with the engine first, consider ~17% loss through the drivetrain, then calculate your approximate trap speed. From there it's easy to figure out what RPM you'll be turning, and should let you know the limits on the gear ratio.
On pure guessing, estimating around 400 horsepower, it'd be safe. BTW, 6000 RPM isn't really that high. She'll take it. ![]()
__________________
Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco ![]() |
![]() |
![]() |
![]() |
#3 |
Registered Member
Join Date: May 1999
Posts: 5,246
|
![]() You'll see approximately 7.5% less RPM with a 28" vs a 26" tire. With 4.10 gearing on a 26" tire, you'll hit 6000rpm at 113mph in 3rd. With a 28" tire, you'll be running at 122mph at 6000rpm in 3rd.
|
![]() |
![]() |
![]() |
#4 |
Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
|
![]() Remember that you'll have additional RPM gain because of the converter. You'll need to know what the approximate slip of the converter is at the TOP end of the RPM range. I agree with Capri, since you're carbureted I'd spin that sucker to the moon.
__________________
Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!" |
![]() |
![]() |
![]() |
#5 |
Registered Member
Join Date: Sep 2002
Location: cent.wis
Posts: 203
|
![]() Looks like i'll be doing some testing soon. Now RPM really plays a factor with all this. How high could I spin this thing. the shortblock is stock. I did the usual rod bearings,main bearings, arp rod bolts,rings etc..but it's still a stock crank, rods, pistons. I did however put on a ATI damper to help out with harmonics. But that is not going to save the world.
|
![]() |
![]() |
![]() |
#6 |
Import Slayer
Join Date: May 1999
Posts: 2,241
|
![]() Your max rpm is going to depend on your cam specs and provided you have the correct valve springs and such to match.
__________________
'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator. |
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
raced a Supra Twin Turbo | Stang35th | Stang Stories | 63 | 08-23-2003 12:36 AM |
The Right Speedo Gear... | Titan | Modular Madness | 8 | 09-23-2002 05:42 PM |
speedo gear | redrider | Windsor Power | 1 | 01-17-2002 10:06 PM |
new gear ratios | faststang90 | Windsor Power | 2 | 12-27-2001 03:29 AM |
Trying to figure out what gear I have... | xspeed02 | Windsor Power | 7 | 03-31-2001 10:06 AM |