PDA

View Full Version : RPM's


eddyb
06-15-2009, 05:57 PM
Took my 2005 x10 out for the first time today since I bought it and would like to know what my rpm's should be at at full throttle. I was over 5000 rpm's at a speed of 35 mph wide open, is this normal?

ed

CameronCarey
06-15-2009, 06:03 PM
I don't know what normal is.................but that's not it....Some one will be along shortly to help you define normal I'm Sure

Good Luck

russlars
06-15-2009, 06:16 PM
Took my 2005 x10 out for the first time today since I bought it and would like to know what my rpm's should be at at full throttle. I was over 5000 rpm's at a speed of 35 mph wide open, is this normal?

ed
Better talk to the guys that are knowledgeable about props because my first guess is that you are severely "under propped". Eric at OJ is a regular on this site. Give him a call or PM.

hawaiianstiln
06-15-2009, 08:33 PM
I guess I would have thought you should be around 4200 RPM's or so. Did you have a ton of people in the boat or any ballast?? Also, you need to get a GPS and make sure you are really going 35 mph. I just got my boat last week for the first time and had it at WOT (wide open throttle) and was around 5200, but the analog guage said 39-41 mph. Which was not accurate. I immediately looked at my Perfect pass speed and it was around 45-47 mph. The analog guage was way off. Which was an easy fix. Just bump up the analog guage speed to match your perfect pass or GPS. I would start there first.

btriantos
06-15-2009, 08:39 PM
is the speedo calibrated?

Engine Nut
06-15-2009, 09:38 PM
Took my 2005 x10 out for the first time today since I bought it and would like to know what my rpm's should be at at full throttle. I was over 5000 rpm's at a speed of 35 mph wide open, is this normal?

ed

It depends on what engine is in the boat. A RTP-1 or MCX needs to be able to turn 4800-5200 at WOT with a normal load in the boat. A 6.0L (LQ9 or LY6) needs to be able to turn 5200-5600 at WOT and an 8.1L needs to be able to turn 5000 to 5400 at WOT with a normal load in the boat. Normal load means how you normally use the boat. If you normally run with full ballast, full fuel and 6 people in the boat, thats what you should prop for. You might bump the RPM limiter when lightly loaded but that is OK ... just back off the throttle a little.

eddyb
06-18-2009, 08:30 AM
thanks for the info. i'm glad to hear the 5200 rpm's is in the range, and i'm pretty sure my speedo is off.

ed