Impeller Selection Help


Any altitude


Heh I really meant “are you at any altitude (ie; 5000ft)” vs “are you at Sea Level”.

This is the general impeller:

Take a couple MM off the trailer edge if at altitude.


I live in the Pacific Northwest and have an altitude of 1800ft. I know the stage 1 kit shows a 13/20. What is the major difference between a 12/20 and a 13/30? George


Just slightly different pitches. We’ve had good luck with the 12/20. The 13/20 is a little taller, but would still recommend the 12/20


Thank you and just placed an order from you for the 12/20 and I am also using your supercharger rebuild service. I appreciate all of your help. Thank you George


George, you’re certainly welcome! Thank you for the business


Hey joe,
2005 rxp
after watching your video upgradnig to 255 I did just that , ic, injectors, scx, flow thru exhaust, power filter intake,
Maptuner x, tune stage 2, worx intake grate, opas block, pro sponsons, rrfpr, blow offvalve, sswearing, now wich impeller do you recomend.
I am 250lbs, ride in colorado river in AZ elev 425


Hi James, well thank you, definitely appreciate you as a customer.

I don’t have my list of maps in front of me…what do you have your RPM limiter set to?


I believe its 8450 , I also am not infront of maps,
Really enjoy the forum and videos keep up the good work.


Also , I am on the fence I am going to purchase 2019 rxp or rxt but leaning towards gp1800r,
Any thoughts?
Thank you,


its 8350


Since you aren’t running real high RPMs, I’d recommend the 15/21. You’ll have the power to push it:

Start a new thread regarding this. They are all very different options but would be more than happy give you information to help you make your decision.


1.2018 spark trixx.
2.Acceleration and a little more top end.
3.No mods right now, but thinking of air i take, ribbon delete, intake grate and exhaust.
4.High elevation

Hello, i am looking for a new impeller. At the dealership they swapped to a high elevation impeller and i never got a description of what the difference was with the impeller.

Thank you for your help


12/17 with a few MM reduced should be right for you at higher elevation. Needs to be closer to a 12/15 or 12/16, so about 3 or 4mm taken off back side


Thank you very much. Really appreciate the help. I should have added i am in Denver around 5k. Thanks again.