I bought my first rx7 last weekend, and I'm in the process of making it street legal. Its a 1985 gsl-se 5 speed 13b with a bridgeport, and full intake and exhaust. Love the car but have no idea how fast im going. I havent driven a lot because i still need to wire some things up. Ive searched for about an hour and cant find anything just wondering if anyone had this information.

 

Go to one of those free sites that let you enter the gear ratios, rear end ratios and tire size
then you can calculate the speed based on the RPM. I did this at one point because my speedo
was acting up to I made a small cheat sheet that fit in my ashtray.

Just use google to look up the GSL-SE ratios and tire size you have then go to a site like this:

Gear Ratio Speed Calculator

I've not used this one but you get the idea.

 

You can use a free app on your phone. I have used SpeedView which has been accurate within about 1mph

 

Thanks ill try both when i get some time. I forget there are apps for almost anything lol

 

Any update?

 

Never messed with the website, and once turn signals are wired up ill be able to her the car on the road. I would drive on some back roads, but i got on it a couple times before i had the app and cops rolled by... The car is ridiculously loud.