CFI piston wash

[geo]

Can you get to a nice brown color and a good looking wash on the pistons and plugs on these motors or does the injector in one port design change everything.

I`ve been getting some nice power increase and lower WO coolant temps with added fuel. But,, I`ve increased fuel a fair bit from what was recommended and just starting to get color on the plugs. Still no wash.
I did get rid of some minor det issues in a couple of spots with the added fuel.

Stock was very lean also but I did see a bit of wash but hot burn.

My heart says add more fuel but my mind asks why lol. Still a work in progress.

Anybody still do things the old way?

 

[snobyrd]

geo, that's a good question, I just did a kit on my sled last nite, with a boonie box, I got some numbers but I was wondering the same thing about wash, Im not sure if u will get good readings with syn oil cause of the suppose lack of carbon , but I'm usin mineral oil so I'm hoping to get good piston readings, in reguards to the injector wash, I can't comment ..

 

[Bossman]

CFI Piston Wash

You do not indicate if your sled is stock or not, but I have spent quite a bit of time working on fuel programs for my stock 2012 Pro a PCV with the AutoTune hooked up so I can see % throttle opening, A/F ratio and RPM all at the same time. I agree that there is very little wash, if any with stock fueling at 8000-8200 RPM. My gauge indicates that the A/F ratio is 13.2:1 with stock fueling. Adding 3% more fuel at top end gave some piston wash, an A/F ratio of about 12.8:1 but hardly any noticeable increase power. I think that the stock low compression head is designed to let the engine run at lean ratios. That being said, there are some very nice gains to be had in low to midrange power and throttle response by adding fuel in the right spots from 3500 RPM to 6500 RPM, where the A/F ratio is extremely lean. Today I built a program for the noisy GGB exhaust can. While the top end fueling was the same as stock, it wanted even more fuel below 6500 RPM. I was surprised that it held the same RPM (8000-8050) as my stock can and seemed to have maybe a little more midrange.
I have also tuned a 2013 Pro with the Bikeman high altitude pipe and high compression head. That combination is very impressive, but likes plenty of fuel to prevent DET issues on pump gas from 7000 RPM to 7500 RPM below 6500 feet. It also required more piston wash than the stock setup and and a richer A/F ratio, but is a real blast to ride.

 

[geo]

Thanx Bman.

I'm playing non-stock with pipe, head, and intake on a '13 (which I understand are leaner and maybe more timing in spots). A lot of my own combination with load and componants so I I have to work this out for myself. I've found the same as you in midrange and got det under control and smooth torque from the bottom.. Maybe a little rich right now but I'll clean that up later.

I'm having a hard time adding enough on top. More I add the better things look and feel. But,,, I'm at 15% (rough numbers) on the mag and 12ish on the PTO and going to 19-20% on the mag and 14ish on the PTO??
I used to get quite a coolant temp spike very quickly with original map and now can pull longer with out the temp. build -up (that seemed to drop power).

I'm starting to wonder if I'm running out of injector (if that is possible with these) or do I just need to follow my heart lol.

Anybody got a pick of a nice wash on a CFI 2?

Are the '13 injectors new. Anyone know how much duty cycle is left from stock?

Also the switch-fuel-modes-on-the-dash is a handy in field tuning tool lol.

 

[likkerpig]

It'd be interesting to see what the duty cycle is and where you are at in terms of maxing it out. Maybe some of the turbo guys would know where the max out limit is at. Anyone know how much the injectors actually flow at stock pressure levels? Also, with the ACats their fuel pumps varied greatly in within spec psi, do the Polaris pumps have a smaller Window of what is within spec for psi out of the fuel pumps?

 

[4Z]

Doesn't the PCV show duty cycle when hooked up to laptop?

 

[108snowbandit]

 

[ditch1000]

geo, that's a good question, I just did a kit on my sled last nite, with a boonie box, I got some numbers but I was wondering the same thing about wash, Im not sure if u will get good readings with syn oil cause of the suppose lack of carbon , but I'm usin mineral oil so I'm hoping to get good piston readings, in reguards to the injector wash, I can't comment ..

So you finally recieved your drop in kit??? Maybe I'll see mine this week!