i need help here my speedo in my car is off by 10mph. i think im doing 40 when im only do 30 need some help here.

 

Did you change tire sizes?

 

What car?

If not tire size, it could be an internal speedometer problem. This thread in the 2nd gen FAQ has info on fixing that sort of problem.

 

it has 14s i think i dont know if that came stock on the 88 or not. i dont know a thing about this kind of car

 

Head up to the 2nd gen FAQ, as it contains tire sizing as well as options and features standard for every model. Maybe spend just a few minutes figuring out what you have so that you can provide some info so that we have a much better chance of being able to answer.

What model is your car? The base model 4 lug came with 14s.

 

i cant find it in the FAQ's. can throw in the link please

 

https://www.rx7club.com/showthread.p...07#post6843007

Find out what model you have. Or just look in the driver's side door jamb. It should tell you the stock tire size on a label with the GVWR.

 

How are you measuring speed?

 

SE
14x5.5 40ET offset

(Often called "Phone Dial" styled)


measuring speed in mph.