View Full Version : HPT A4 Shift question with 3:73 Gears ,Rpm=Mph?

Pro Mouse
07-21-2005, 05:48 PM
Does anyone know what RPMs = MPH in 1st ,2nd and 3rd gear?
I think this is it if I remember right.
1st gear=149 rpm = 1mph
2nd gear=89 rpm = 1mph
3rd gear= 54 rpm = 1mph


07-21-2005, 05:57 PM
depends on your rear tire but I'm getting
1st = 149RPM/MPH
3rd = 49RPM/MPH

I just used the gear calculator on ( and divided appropriately

This was w/the 25.66" diameter rear tear

Keep in mind though you can't go by this w/an A4 w/a bigger aftermarket converter... the converter slips so you're never getting 100% of your RPM as useable (unless you lock the converter)

When I adjust my WOT tables I prefer to just use the RPM tables... I set the MPH real low for WOT shifts, but set the RPM to whatever I want it to shift at minus about 150 RPM

Pro Mouse
07-21-2005, 06:14 PM
Thanks Horist.I have stock Tire Dia. P275/40 R17 Nitto Drag Radials Is that 25.625?I cant remember???


Pro Mouse
07-21-2005, 06:22 PM
Horist Thanks for the link ,but is this right?I had to use a 98 f body A4
1st =3.06
2nd =1.62
???? I thought 4th was .6????

Pro Mouse
07-21-2005, 06:23 PM
Oh Crap I forgot to add Does a Stall Converter Change this?

07-22-2005, 09:54 AM
YES! In fact if you log your Engine Rpm (SAE) and you Trans Input Shaft RPM, you can figure out what your efficiency is. Then mearly multiply your results from by that number for your true reading. I recently verified this with my B&M converter (which is 97% effiecient) and multiplied the results from that calculator and they matched my logged info.

Pro Mouse
07-22-2005, 05:47 PM
Ok cool Thanks!!