Thread: LOW RPM's & Speed
08-29-2009, 11:18 PM #1
LOW RPM's & Speed
Hey guys, I need your help. I want to improve the performance of my 2005 RXT with a Stage I kit. I took the ski out to get a baseline and the best I could get was 7450-7500rpms and 59.5mph. Definitely a lttle off! I searched and found some common causes could be a worn wear ring and a slipping S/C. I replaced the wear ring and shimmed the S/C to 120 in/lbs. Today my best was 7600rpms and 60.4. I little improvement but not much. What else should I check? All you Speed Demons out there, any suggestions? One other thing, the motor is out of a 2004 RXP. My motor ate a valve and I got this one from a forum member when he parted out his 80+Stage III. Can heat and humidity effect performance this much?
08-29-2009, 11:41 PM #2
Yes, heat and humidity can effect performance. Also check for a boost leak.
08-29-2009, 11:44 PM #3
check your oil level; it has to be in between the two bends. even with good clutch you can get slippage with too much oil. check your plugs too. how many hours does the engine have?
08-29-2009, 11:45 PM #4
08-30-2009, 07:11 AM #5
Knock Sensor Update for 2004 Wire Harness
08-30-2009, 10:48 AM #6
The oil level is good - between the bend (ski level, checked 30 seconds after warm up). The plugs looked good - light tan in color. The ski doesn't miss or anyhing so I just reinstalled them. About 75 hours on the motor.
The harness and ECU are the originals - 2005 RXT.
I read the thread about the knock sensor update but it says it pertains to early 2004 RXP ECU's. I'm using the 2005 RXT ECU. Could this still be the problem? I might just have to spend $40 and get the pigtail. If it works, that's money well spent! If not, it's only $40 bucks. My local dealer won't be open till Tuesday.
Any other suggestions/ideas?? Keep em coming, I'll try anything once!!
08-30-2009, 11:00 AM #7
Quick test. Check the ohms between pin #1 and #2 on the knock harness it should read 1710-1890 ohms. As I recently found out on my 05 it did not have the resistors in the harness as I was lead to believe.
08-30-2009, 01:31 PM #8
08-31-2009, 05:15 PM #9
Beerdart - I checked the ohms between pins 1 & 2 of the knock sensor harness connector. It measured 23-24K ohms. I assume thats means I need the pigtail? I'll get one tomorrow if they have it in stock.
stl2slw - I'm running the stock RXT impeller. I inspected it when I replaced the wear ring - it's good.
I'll post up when I know something.
08-31-2009, 05:18 PM #10
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