xCH121Sx

hey i have a TurboII Transmission on my GXL. i just recently got the Speedo working and im wondering if its reading incorrect since there 2 different kinds.

it feels incorrect? but im not sure... i dont know my sense of speed.
if its off by a little then no worries.

someone told me to go to this site to plug in the gear ratios and stuff but that didnt help too much. i dont think i plugged in the numbers right...

tell me if this is right when you guys are driving.
...in 5th Gear, 4000RPM's, and it reads 80MPH.

introVert

I have an 88 'vert (n/a motor) and a tII tranny & rear end, and my speedo is accurate (verified by cop radar sign and buddy pacing me calling out speeds on cell phone)


Hope this helps (also have stock 88 n/a gauge cluster)

xCH121Sx

well what year is ur TurboII tranny? maybe they have the same gear size on the sending gear of the speedo.

im not sure.

88 SE

4000@80 seems right to me.

flamin-roids

I've got a S5 N/A with a S4 TII tranny and a 3.90 auto rear end and somewhow its accurate.

Digi7ech

iTrader: (1)

I have a NA rear end and TII tranny. Speedo if fine.

Confirmed by Cop as well. 70+ in a 40 oops!

xCH121Sx

what do you mean by rear end? like the differential? or wat

introVert

Yes, the diff. And my n/a motor is s4, trans and rear is s5 turbo.

HHTurboVert

I have a T2 diff, tranny and engine in my Vert, but my 80mph reads 3500rpm? not 4000. Maybe mines off? My old vert tranny and diff read 3000 at 80mph?

JerryLH3

iTrader: (11)

What year TII tranny? If you have an S4 and stock tire sizes and a 4.1 rear end then that 4000 rpm @ 80 mph is way off. If you have an S5 and stock tire sizes and a 4.1 rear end then 4000 rpm @ 80 mph is even farther off.

By my program, 4000 rpm would correspond to 94 mph and 99 mph respectively for a S4 fifth gear and an S5 fifth gear. This is of course assuming stock 205/60-15 tires and a 4.1 rear end. If those numbers are different, then we need to know them to tell whether your speedo is off or not.