SKU: MOR89650
UPC: 084663896507
MPN: 89650
The MOROSO Power/Speed Calculator (part 89650) is a pocket-sized slide tool built for racers and engine builders who want quick performance estimates without firing up a laptop. It calculates elapsed time and trap speed from four inputs: horsepower, vehicle weight, tire size, and gear ratio. That makes it a fast reference at the track or in the shop when you're sorting out a combination before committing to dyno time or a test pass. For anyone chasing a target E.T., it turns guesswork into a defensible starting point. It's a simple analog tool that does one job and does it well.
MOROSO built this as a sliding-scale calculator measuring roughly an inch on its short dimension, sized to live in a toolbox drawer or a race trailer cubby. You line up your known values on the slide and read off the predicted E.T. or M.P.H. directly, no batteries, no app, no signal required. Because it works off horsepower, weight, tire size, and gear ratio together, it lets you run what-if scenarios on the fly: drop a hundred pounds, swap a rear gear, change tire diameter, and see how the numbers move. MOROSO has supplied the racing and street-performance market for decades with over 4,000 products, and this calculator carries that same purpose-built approach. It ships individually and stores flat alongside the rest of your shop reference gear.
Reach for the 89650 during pre-race planning, when evaluating a gear change, or when a customer wants a ballpark E.T. for a proposed build. It pairs well with the kind of measurement and setup gear we stock across our tools and shop equipment, including a degree wheel for cam timing and a track stopwatch for verifying your real-world numbers against the prediction. Keep one in the trailer and one on the bench. When the math checks out before you ever leave the staging lanes, you spend fewer passes chasing a tune and more time refining a setup that already works.
It calculates predicted elapsed time (E.T.) and trap speed (M.P.H.) using four inputs: horsepower, vehicle weight, tire size, and gear ratio. You set your known values on the slide and read the estimated result directly, giving you a quick performance baseline before testing.
No. It's a fully analog slide tool with no batteries, software, or connectivity required. That makes it reliable at the track or in the shop where power and signal aren't guaranteed, and it stores flat in a toolbox drawer or trailer cubby.
Racers, engine builders, and street-performance enthusiasts who want fast E.T. and M.P.H. estimates when planning a build or evaluating changes like a different rear gear or tire diameter. It helps you run what-if scenarios before spending time on the dyno or test passes.
Yes. Per manufacturer specifications, the 89650 is sold each. It's a compact tool that pairs well with other measurement and setup gear in our tools section for dialing in a combination.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
