04-19-2010, 11:01 AM #1
Loss in speed after SuperCharger Rebuild
My top end speed is down about 4 or 5 mph on my RXT. I recently did a SuperCharger rebuild through Jerry, and I also had my Pump rebuilt with new bearings and grease. So now I'm not sure which of those two things is causing the trouble.
It is difficult to say whether or not my RPM's are lower. My RPM's have always varied based on the outdoor temperature. 8100 when it's cool outside, and about 7840 when it's really hot.
I can say this though, during the middle of the summer, when my RPM's are maxing out at 7840, my top speed is always around 65 mph. Right now with a 7800 RPM I'm struggling to get to 60 mph. So my speed is much lower within the same RPM range. Could this have something to do with the new bearings in my pump? I noticed before I put it back on that it was much harder to spin the impellar than it was previously. Perhaps the mechanic pressurized it with too much grease?
Thanks for any advice.
04-19-2010, 11:10 AM #2
Additional background on the problem:
Oil level is good. Same as it was before doing the SC and Pump rebuilds.
No visible water or hose leaks.
04-19-2010, 11:29 AM #3
If you are still maintaining RPM then your supercharger is fine.
Your RPM's are still too low. You want to be at 8100 RPM.
What ski do you have and what are your mods?
Make sure your intake grate has not pulled out at the back and is hanging down.
Also, Make sure your wear ring is in good shape.
04-19-2010, 11:40 AM #4
Check your OPAS to see if they are coming up at speed.
04-19-2010, 11:41 AM #5
Ski is an RXT 215, completely stock. I also just had the oil seal, shaft sleeve, angled bearing, and wear ring replaced on my pump. The impeller was fairly difficult to spin by hand when I put my pump back on, so I'm thinking it might be the cause of the problem. Would too much grease make the impeller difficult to spin?
04-19-2010, 11:42 AM #6
04-19-2010, 11:54 AM #7
04-19-2010, 01:31 PM #8
If your OPAS is stuck in the down position they will cause the speed loss you are seeing.
You can install these
Or just remove OPAS all together with one of the OPAS blockoff kits.
04-19-2010, 04:36 PM #9
Jerry, I ride in ocean chop all the time so I'm very curious about this Competition O.P.A.S. kit. Do you know anyone who has used it? Does it really make a noticeable difference?
04-19-2010, 05:55 PM #10
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