guitaraus

With all the talk on this site of top speed this and top speed that, I was really interested in a recent article in C/D magazine. They tested the speedometers of the big three North American, Japanese, and European brand cars, and I was surprised at the results. On average, a Nissan car, when moving at a true 70 mph, will say 71.6 on the speedometer. I'm not a math major or anything, but at that rate, I'm sure when somebody's talking about how their speedometer topped out at 140, they weren't going anywhere near that. BMW's showed 73.18 mph at 70 mph! I guess I don't really have a point, just wondering if anybody had any thoughts on this.

Peace

SuDZ

Now for people who change stck rim and tire size, they are even further off. So it all depnds on your setup also.

SuDZ

guitaraus

Doesn't adding larger rim/tire combos make the speedometer read slow? If so, maybe adding 17's or so would actually HELP nissan's speedometer accuracy! Crazy....

NotNew!!NewSN!!

yea but did u read the other part, after 1000 miles of travel it told what each cars odometers displayed. most of them were over 1010+ and some germans were rilly bad,

what did nissan's say? 1001,

Nismo87SE

Factory speedo's are always off, ours most definitly. I did alittle testing of my own in both my 87 maxima and 91 se-r. There used to be one of those radar stations on the freeway that showed your speed. So at an idicated 60mph is really 58mph, 95mph is 87-89mph, 110mph is 99-102mph . Hell even at the track I ran a 87mph trapspeed while the speedo was around 91-93mph.

bert

This has been discussed ad-nauseum. Here is a resume.

The 2000 spedo's are not too bad. They are electronically controled from the ECU and not a direct sensor to the tranny. This is why the ECU part # differ between models and date manufactured.

To be sure you are always better off auto timing yourself. Drive down the highway on cruise, choosing 60 MPH reallay helps the calculations. Do 10-20 miles. @60 you should be doing a mile a minute. Do the calc and you will know exactly how far off you are. This is especially usefull if you have + or - tire sizing, like i do with my fabulous winter tires.

With my summers I am off by less than 1%, tested @75Mph with my winters I showing faster by 1.5% But as long as you know how far off you are, who cares!

I wouldn't trust those by-the-side-of-the-road spedos. Half of them I saw are FUBAR (You are doing 58Mph, when I really was doing 85) or they are set artificially high to scare you.

Stereodude

120km/hr in my car is 121km/hr according to a GPS unit, so it's pretty close.

Stereodude