how many mph's will i be off after my 4.30 gear install??

[98blackstallion]

I have a 98 GT 5 speed and I am just wondering how far i am gonna be off stock with my 4.30's that will be installed within the next 2 weeks. I figure like 15mph what do you guys think?

 

[Erskine]

alot

 

[98blackstallion]

i think i have 3.27's in the rear right now.

 

[Give Me TP]

My estimate is you will show 79 mph when you are actually going 60 mph.

 

[jimfitzgerald]

4.30/3.27=1.315 You will register 31.5 percent faster than your actual speed. At 60 mph, you will register 79 mph.

 

[Give Me TP]

Same math I used.

If you keep track of your miles driven after changing the gear ratio, you can correct the odometer to the true amount if/when you get a SpeedCal.

 

[crazynorwegian]

http://www.corral.net/tech/gearcalc.html


at 65mph your speedo will read 85mph.

 

[stangGT97]

get a new speedo gear to go with your 4.30s and avoid the need for a tuner

 

[98blackstallion]

Ok so about 19-20 miles an hour off thanks guys

 

[kolkid]

Ok so about 19-20 miles an hour off thanks guys

No, i think its more like a 31 % percentage gain not a 20mph gain it wont be like when it shows 20mph ur ganna be going 1mph but it will be true when ur going 60 when it shows 79mph
i dont know if u knew this already but i thought id clear it up anyway

 

[jimfitzgerald]

No, i think its more like a 31 % percentage gain not a 20mph gain it wont be like when it shows 20mph ur ganna be going 1mph but it will be true when ur going 60 when it shows 79mph
i dont know if u knew this already but i thought id clear it up anyway

Right. At 40 mph, you'll indicate 53. At 100 mph, you'll indicate 131.

 

[98blackstallion]

ok thanks guys I just needed to know that.