Spimothy Leary
Well-Known Member
2008 rxtx stage 1...
Ski not running right, sigh. Can't say for sure if it was a sudden or gradual loss, the last 4-5 rides i've had have been very slow group cruises with no high speed runs but when I went out with 1 fast buddy two weeks ago, I noticed this major issue (speed/rpm) and a bit of surging around 6300.
The last legit speed run 4-5 weeks ago I was just a hair under 71 mph and I can't recall rpm's but i'm thinking 7550, very hot & humid that day.
Current condition.
6600 rpm, 61mph, obviously should be way higher on both.
rebuilt supercharger, it was slipping and time for a rebuild anyway so it had to be done. took it out yesterday and my speed/rpm issues are exactly the same.
So, now the gremlin chasing begins via process of elimination.
impeller and wear ring (new) good condition, no cavitation that I notice.
intercooler new and not leaking
new plugs
have a spare coil and can do some coil swapping during next water test.
New battery (3 months) but will make sure battery has full charge and do a load test.
just bought a cheap boost gauge, will install and see what that shows < maybe a leak?.
other possible issues?
bad sensor that's not throwing a code? we can swap out and try maybe its slowing the timing?
compression, will verify.
other thing's i'm looking into...
injectors,
fuel regulator?
exhaust leak that I haven't noticed
fuel filter ? < possible (likely) its never been changed and I have 200 hours I just ordered one from RIVA for $26 < can't hurt to change that.
anything else that i'm overlooking?
Ski not running right, sigh. Can't say for sure if it was a sudden or gradual loss, the last 4-5 rides i've had have been very slow group cruises with no high speed runs but when I went out with 1 fast buddy two weeks ago, I noticed this major issue (speed/rpm) and a bit of surging around 6300.
The last legit speed run 4-5 weeks ago I was just a hair under 71 mph and I can't recall rpm's but i'm thinking 7550, very hot & humid that day.
Current condition.
6600 rpm, 61mph, obviously should be way higher on both.
rebuilt supercharger, it was slipping and time for a rebuild anyway so it had to be done. took it out yesterday and my speed/rpm issues are exactly the same.
So, now the gremlin chasing begins via process of elimination.
impeller and wear ring (new) good condition, no cavitation that I notice.
intercooler new and not leaking
new plugs
have a spare coil and can do some coil swapping during next water test.
New battery (3 months) but will make sure battery has full charge and do a load test.
just bought a cheap boost gauge, will install and see what that shows < maybe a leak?.
other possible issues?
bad sensor that's not throwing a code? we can swap out and try maybe its slowing the timing?
compression, will verify.
other thing's i'm looking into...
injectors,
fuel regulator?
exhaust leak that I haven't noticed
fuel filter ? < possible (likely) its never been changed and I have 200 hours I just ordered one from RIVA for $26 < can't hurt to change that.
anything else that i'm overlooking?
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