The Low Down

MPI’s ECU reprogramming service is available for Polaris Ranger, RZR, as well as 700 and 800 Sportsman ATVs. Customers send their stock ECU into MPI and it is returned within days with a new program and a nice billet engraved end cap. MPI engineers program the ECU to raise the rev-limiter from 6100 rpm (6500 rpm RZR) to 7000 rpm, remove the speed limiter, optimize the timing curve, and optimize the fuel curve. The MPI programming will work well with superchargers, turbos, and big bore engines but custom programming is also available for highly modified engines.

Our Thoughts

We tested the MPI box on a RZR and found that it helped the machine accelerate quicker and reach a better
top speed. Raising the rev limiter is also a nice feature but the engine probably would need to be re-clutched
to see a noticeable gain from the higher RPMs. The completely stock RZR we tested would top out at about
70 MPH using the MPI box.

Contact Information
888-649-4609 - www.mountainperformance.com

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