Thread: Spent $5,000 and lost 2 MPH
05-24-2014, 03:33 PM #1
Spent $5,000 and lost 2 MPH
Striped my 2010 shaft the end of last season so I had the shaft replaced with a 2011 set up. I also found out the pump had a small crack(sucked up some rocks) so I built a completely new pump. While doing this I(Tiny & I, mostly Tiny) made some other mods:
- I was running a SRZ/1522R prop- everyone said it was to much prop so we installed a SRZ/15R20.
- My SC had 96 Hrs. on it so Tiny installed a Riva XXX-SC, along with RRFFR & V-Tech 1100cc injectors.
- I already had a V-Tech re-flash but I bought a maptunner and a tune.
- changed the 85mm Nozzle to 83mm.
- Replaced the valve retainers with Les Cooke valve retainers (yes I should have replace the springs).
I Finally got the ski in the water today.
Boost went from 10.5 to 13.5 which is what I expected.
RPMs/speed not so good. I was doing 8100/72-74 MPH last year. Now I'm doing 8100/70 MPH. I saw 8450 just for a second and then it dropped back down to 8100. It seems like the tune didn't take. I don't know the tune details because Tiny handled the tune. I think he said he was going to set it for 8650 unless the ski is all over the limiter then he would raise it some.
Is there any way to verify the ECU took the tune?
Any help would be appreciated.
05-24-2014, 07:14 PM #2
05-24-2014, 07:38 PM #3
Thanks Chris for the response but I don't know how/where to find that information.
05-24-2014, 07:52 PM #4
so how do you check your afr
it must be in that $5000 budget
sounds like your running real rich
05-24-2014, 08:12 PM #5
Put the 85mm ring/nozzle back in. That will raise the rpm some, about 150. With just retainers and stock springs your max rpm is 8550......
You also need the datalogger/O2 sensor......without those you're pissin' in the wind.
Last edited by 1tommygunner1927; 05-25-2014 at 08:02 AM.
05-24-2014, 08:37 PM #6
It took me almost 1 week to get the tune from Vtech. Several phone calls,text messages, and emails just to get the tune from them. I followed the VERY vague instructions in the maptuner and had to do that 7 times before it finally wrote to the ECU. Finally said successful..
Wouldnt the 85mm nozzle lower the RPM even more??? since it is a larger opening, it has less thrust so less rpm??????
Ed did not buy the data logger nor is there a O2 sensor in the ski. If it was THAT rich to lose 500 plus RPM, wouldnt that stink to high hell and back of fuel or foul a plug???
The tune in the ski is the 8800 1100 because that is the only tune that Vtech gave me.....
And as far as the retainers go, the stock valve train is good to 8800 before springs is what I have always done.
My opinion is that the prop is still wrong, but I am open to suggestions..... I dont trust the "R" in the prop that they are actually what they say they are.
05-24-2014, 08:48 PM #7
so your just going to trust your motor to some flash....
the first upgrade to any boosted motor is a way to monitor the afr
you don't need a gage if you can check a log
a larger nozzle will raise rpms because the water can flow thru the bigger hole easier
05-24-2014, 08:52 PM #8
You have to data log, taking shots in the dark without it. I wouldn't have been able to get my ski tuned without it.
05-24-2014, 09:09 PM #9
It looks like I have no choice, I'll have to buy the logger. It seems like you shouldn't even consider a tune without the logger. It should be 1 tool.
05-24-2014, 09:27 PM #10
@Tiny - the 8800/8900 tunes that I used last season were a little on the lean side. There was a 8650 tune that Jonatan sent me that was spot on @ 58psi . I wouldn't run that ski till you get a logger or an AFR gauge on it.
I'd also put the 83 nozzle back on as recommended earlier. I run around a 13/21 pitch. Hope this helps a little. I know every ski is different but, immred has almost exactly the same mods as I do except I'm running a 137+4.
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