top speed prob?

[stevemac 0]

Just get some 18" wheels - for every 1000m that you do, the speedo will only record 950.. :lol: :lol:

[jedi-knight83 0]

If the spindle speed is directly related to the mileage counter, then for every 1000 miles you do, your speedo will record 1100.....

 

thats a question i asked a while back but no one knew the answer! i guess i should have checked the mileage properly aswell.

 

at 60mph its hard to see if there is any difference in the speedo...at 70 its more noticeable infatcits near on 10% all the way up to about 120mph indicated.

[Kevin Bacon 5]

Well I guess the odometer gets it's input from the same source but perhaps the needle has lost it's calibration?

 

I had the same thing happen in my MK1 16V, the needle was way out but I drove the car a distance I knew to be exactly 1 mile and the odometer clicked over 1 mile in the right place....so might be worth trying that somewhere. Do a 1 mile point to point measurement with your GPS, if you can?

 

K

[dr_mat 0]

I think the mileometer itself will be more accurate, because it's linear. Clearly the inaccuracy on the speedo (at least in this case) in non-linear.

Also because when they are designing the instruments, the milometer is designed to be correct, whereas the speedo is designed to read +5%, to make sure that it's NEVER reading low. (There's a law that says they can't read low, but no such law effects mileometers.)

[corradokid 0]

so im not the only one to be doing top spped testing down the m25 hey?!?

 

Ive hit 137 ( indicated ) in my 1.8 16v, on a flat bit. Id say that it felt like about 125-130 max really.

Also hit 136 in my toyota corolla (1.6!) but this was down hill

[Gaz154 0]

i hit about 140 just as i went over a small crest before a long down hill section and the car felt like it almost lifted of the ground :shock: :shock: :shock:

 

was followed by swift application of the brakes back to legal speeds and even swifter changing of the boxers cause they were full to the neck :oops: :oops: :oops: