09-25-2009, 03:42 PM #1
Need some help tuning in my impeller
I just installed a Riva rear air, and haven't had a chance to get out on the water yet. I'm going tomorrow to try it out. Before installing the intake, my RPM's were right at 8100 and occasionally 8150. I know I will be all over the limiter now with the new intake (replaced stock air intake). I was wondering (generally speaking) how many RPM's are gained from the riva rear air so I know how much pitch to add. I am riding in around 85* air and 75* water. My impeller is stock right now. Thanks!
09-25-2009, 04:05 PM #2
Befor you do anything to your prop go out and see where your at rpm wise. Dont assume you will be over the limiter just from the rear air. When I switched from the riva 3 in. intake to the rear air when I still had the stock charger I saw no gain. For the most part I think you will only see gains with the rear air if you running a bigger charger. The stock charger dosent draw enough air to see gains with the rear air from my experience
09-25-2009, 04:54 PM #3
Ok thanks. I'll try it out as is, and see if I need to change anything afterwards. I appreciate the input.
09-26-2009, 10:09 AM #4
I hate to disagree...well....not really....I saw gains when I went to a rear air set-up on an oem sc.
What's gonna be a big difference maker is taking that flo-rite material off and running a screen instead.
I was all over the limiter when I built and installed my own rear air. Not understanding what was happening...I didn't see any difference either. I took my own flo-rite material off and substituted a stainless screen.....that was the ticket. I started tweeking the prop and finally saw how much the system had improved. I ended up adding 3mm to my prop while still hitting 8100 rpm....in the summer heat. After that I went to a 14/19 and took some out....till I lost a bearing and upgraded....now I'm going the other way.
So....if it was me....with the temps cooling off....I'd add 2mm to your oem prop.
I just noticed...you have an xs ic installed now?....deffinately add a coupla mm before you go....if it was me.
09-26-2009, 12:54 PM #5
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