Thread: what the F??/
02-26-2012, 01:15 AM #1
what the F??/
hi guys ,
frustration really kicking in..
2011 rxpx - owned since new and added the followings mods at 20 hrs
8650 ecu reflash
les cooke b kit
4 inch air
i cant get speed.. ! regardless of conditions ,weather ,fuel ,cold or warm somehings not right - no joy! best run is 74 mph.(GPS)
i started with 14/18 skat , repitched to 8550 rpm - got smoked by mates rxp with xcharger/ecu reflash and air
tried again and had my stock prop repitched - still no joy
now i ve bought a solas 15/22 r - take off is slower and revving only to 7900 rpm - like i dont have enough power to turm prop..
my brother has a stock rxpx 2011 - and im only marginally quicker running my repitched stock prop (thats the fastest setup ive had)
i ve checked boost - no leaks, pulled intercooler and cleaned (just incase) - boost is at approx 14 psi
big $$ spent with no go to match =
Arent these 14 psi chargers supposed to kick hard--?? am i expecting to much??
02-26-2012, 01:17 AM #2
Are you running the stock grate? Put on a R&D grate.
02-26-2012, 01:21 AM #3
What are your afrs at WOT?
02-26-2012, 02:13 AM #4
hows the wear ring? that makes a HUGE difference. and are you fat? i am 260ish and that slows mine down a ton!
02-26-2012, 02:24 AM #5
02-26-2012, 02:43 AM #6
It's your fuel pump possibly. Mine did the same thing and I chased my ass for months. There is not enough fuel pressure to get the RPM's up. I added a Walbro and no more issues. I could only rev to 7920. Changed the pump, revving 8600 now. I chased timing, cam, injectors, prop, shoe, grate, plugs, gaskets, drive shaft, charger, oil, etc..... I chased everything except the fuel pump. Often the simplest of answers are the most likely of culprits. Good Luck.
The way I figured it out was that with the RRFPR, I could crank the regulator wide open and it would not go past 64psi on idle no matter how high I put it. So with the base pressure at 59, adding 13-14lbs of boost, I was over extending the power of the OEM pump. New one in, BINGO! This is where I would start. The pumps are $85.00 and a good investment especially for a B kit.
02-26-2012, 02:52 AM #7
Something is definitely wrong bro! Did you have to add or take pitch from the Skat prop to get 8550? I'm asking because my setup is similar and I can turn the 15/19 +1mm to 8600 and about 76mph on the GPS. When I had the 15/22 I could turn that to 8500. It seems to me like you are missing about 600rpm. I'd start with plugs, checking oil level, wear ring, etc.
You should blow away a stock x ski.
Msrxp might be on to something there.... But you are running stock injectors and reg if I'm correct?
02-26-2012, 02:56 AM #8
02-26-2012, 03:00 AM #9
02-26-2012, 03:06 AM #10
Oh, is he running a regulator (RRFPR) with that 'B' Kit? Should be for safety IMO! Especially if it tends to run lean without it.....
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