89650 POWER-SPEED CALCULATOR

Neat tool to give you a idea about what effects what , I'm sure there are many factors the tool can't compensate for , but it's gets you in the ball park . Fine tuning from there .

I bought one of these in the 1970's when I began drag racing. After about 60 years, age took it's toll, it became unusable and I needed a replacement. These are the same calculators used back then and are some of the best for making "quick and dirty" calculations at the track. The only improvement I could recommend is that the horsepower range be extended to 1500 to 3000 hp to make ET and MPH estimations easier for higher horsepower cars.

It provides what you should be getting on your vehicle 🚜 performance to determine if the car really does have that kinda power

I have had the old model for 40 years and it has saved me a lot of time. I ordered a new one for my son-in-law and after looking at the new information that has been added to the slide rule type calculator I had to have one for myself.Numbers never change so it will never go out of date. If you love drag racing or building cars this is a MUST HAVE ITEM.........MR66 CHEVELLE SS

Great tool. Very accurate

Been using this for decades & have given a dozen to friends. Pretty accurate.

Very accurate from my past experience with one of these! Had to buy a NEW one! Wore mine out after 20 years of use!!!!!!!!!!

Bought this as a present for my Dad, I ended up buying one for me also,what cool little tool

I still have my original Power Speed Calculator from the 70's. it yellowed over the years and is a little hard to read, so when I saw the chance to purchase a new one, I did. Love it, now if I could just find the Pete Jackson Tire/Traction Calculator from the same era...