| Home | Register | FAQ | Members List | Calendar | Blogs | Garage | Gallery | Search | Today's Posts | Mark Forums Read |
| | |||||||||||
| ||||||||||||
|
|||||||
Discussing Rear gear...speedo off!!! in the 4V / SVT Forum. I put this in the drivetrain category as well... Alright here is what I have...... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
|
|
LinkBack | Thread Tools |
July 14th, 2008, 08:06 PM
|
#1 |
|
Regular
99 Cobra
13.77 @ 102
Join Date: Aug 2006
Location: Lexington, SC...for now
Posts: 155
|
Rear gear...speedo off!!!Alright here is what I have...a speedo that is way off even after programming with a handheld!!! I'm running a T-56 Cobra spec with a 3.73 rear gear on a 295 rear tire. After many hours of searching and plugging in numbers into a gear chart, I have concluded by looking at the chart going by the displayed speed reading on the speedo at the given RPM in a given gear, it looks like 4.30 gears match the speed that I am going. Would I be able to program the car to the 4.30 gear and have the speedo be closer to accurate? Or would that just be wasting my time? For instance...I'm running 44 mph on the speedo at 2500 in 4th gear. Looking at the 3.73 calculations in the chart the speedo should be reading 52 mph. If I plug in the same tire, gear and trans ratios...4.30 gear is closest to what the speedo is reading!!! The car has been going a good while like this and I just want to get it close to accurate as I can to keep mileages and such inline...not to mention I don't want a speeding ticket either! Any insight or help would be appreciated!!!
__________________
99 Cobra, T-56, Spec Stage 3, aluminum driveshaft, MGW shifter, shorties, X, FM Amer. Thunder, 3.73, SRA, FR500 18s, JLT RAI, Tokico struts, adjustable UCA's/LCA's, H&R Rear Springs |
|
July 14th, 2008, 08:49 PM
|
#2 |
|
Enthusiast
1999 SVT Cobra
14.36@98.46
Join Date: Dec 2007
Location: North Carolina
Posts: 672
|
i realy dont wanna get off subject, but quick question, how do you like your mgw shifter?
__________________
|
|
July 14th, 2008, 08:49 PM
|
#3 |
|
July 08 ROTM
2004 Mach 1
Too Slow
Join Date: Sep 2007
Location: Fantasy Land
Posts: 2,735
|
Get a tuner, that should correct the speedo
__________________
 MM MACH 1 CREW MEMBER #2 McCain/Palin '08 Arsenal0328 (10:32:19 PM): mso gives me a raging hard on |
|
July 15th, 2008, 07:10 AM
|
#4 | ||
|
N/A 4v Guru
2003 Mach 1
Join Date: Oct 2007
Location: N.W. Arkansas
Posts: 2,968
|
He has a tuner. Just plug in the gear that puts the speedo where it needs to be. you are looking at a differnent top end gear ratio on the 56 thats the issue. Do your calculations and put in the tuner what it needs even though its not what you have.
__________________
 Project N/A 4V Under Way
|
||
|
July 15th, 2008, 08:12 AM
|
#5 |
|
Regular
Mtn. Bike
8.14@198.98MPH LOL
Join Date: Feb 2008
Location: WYOMING
Posts: 57
|
-97cobra
get ahold of a good dyno tuning shop and tell them what you got and Im sure they have came across a simular issue and could send you a correct tune for it. |
|
July 15th, 2008, 10:42 AM
|
#6 | |
|
Enthusiast
1999 SVT Cobra
14.36@98.46
Join Date: Dec 2007
Location: North Carolina
Posts: 672
|
__________________
|
|
 |
| Thread Tools | |
|
|
Threads Similar to: Rear gear...speedo off!!!
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Rear gear...speedo off!!! | matted2thefloor | Drivetrain | 4 | July 14th, 2008 08:21 PM |
| Speedo Gear.. | 94StAnG5.0 | Drivetrain | 3 | June 12th, 2008 12:55 PM |
| speedo gear | product1620 | 96-98 | 14 | May 8th, 2008 09:15 AM |
| Speedo Gear? | MustangMatt96GT | 96-98 | 1 | July 7th, 2007 05:04 PM |
| 3.73 and speedo gear | untamed97stang | Modular Mustangs | 4 | April 26th, 2007 11:31 AM |
