MPH

RUN 27 INCH OR LARGER DIAMETER TIRES!!

This ain't no low rider, 10 inch diameter wheels, with the front jumping up and down. Running 17" dimaeter wheels.

Lloyd, help! Come to the rescue.

Two ways I know is to have it calibrated at a speedo shop or pull the drive gear in the ZF and see if it's a US spec drive ratio or a euro drive. The US drive has 009 on the gear and the euro drive has a odd ratio with no number, I have a few at the shop I replaced out of some US cars but don't know how they got there.

Thanks Lloyd. Would I need to take the entire car to the speedo shop, or a certain part? Do you have any recommendations for a shop in Orange County, CA?

TOO Fast
Lloyd is located in the city of Orange, CA

Lloyd, I would like to look into getting it claibrated. Requires that then entire car comes in, or a certain part. Can you do this at you shop in Orange?

No, I think you may have to go to LA.

I have a similar problem. Reads 60, doing 45. But this is a stock car (except for the go fast speedo mod!). Rear tires are 265/50/r15.

I am reluctant to remove the speedo housing with out learning more, I read somewhere in the archives about a shaft dropping inside the ZF if you weren't careful!

I have seen gear reduction speedo boxes, this was going to be my fix. Let us know how the problem resolves for you.

When I fix the high speedo, I will have to invest in a stroked, supercharged, 400M with Nitrous to get my Zero to sixty time back to 4.1 secs


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Yes, it makes 0 to 60 fun on the speedo. I have not fixed mine yet. I am only concerned that it puts more mileage on the car than reality. More mileage = less value.

I would check to see if you 90 deg. drive is the right one if it's a VDO there are two
a 1610 rev and a 1210 rev.

quote:

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Originally posted by Lloyd Butfoy:
I would check to see if you 90 deg. drive is the right one if it's a VDO there are two
a 1610 rev and a 1210 rev.

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Thanks, how do I check the drive (where is it on the car?).

The VDO 90 deg. has the ratio stamped on it 1:1 or 1.1:1, and on the back of the speedo gauge in the dash, in black is marked 1610 or 1210. I will post witch one will match what when I get to work unless someone has this info they can add. Now we are getting a little far from the ZF (ha ha)