The Fix Kit and PC V

[Hondaracer315]

How many people out there are using the PC V for their 800's along with the fix kit by mtntek? Also even though they say not to in the directions why did you use the PC V anyways? Last question what map works with the fix kit? I live in Alaska if that helps! Thanks

Chris

 

[jim9006]

Quite a few of us were using that combo but most have moved on to the new machines. However there are still a few here and I am one who is still using it. I used the PC5 and the MTK because … well first I bought the PC5 to fix some issues then got the mtk and that’s it. It works, I now have no issues and a reliable sled. The map I use is a modified SLP map (available in the sticky’s it think). Mostly I leaned the midrange some from what SLP had. Oh, and I use the original updated ’09 map as a base. I hear but have not tried, the original ’08 map and head work really good.

 

[Hondaracer315]

Why does mtntek say not to use it? I called them and all I got was its because it can cause some issues but didn't elaborate any further. Obviously there is a lean spot in the middle ok I got that, so how does the fix kit fix that without the controller and a decent map, you know what I mean? You would assume they would say for you to use the PC5 to aid in the fueling!

 

[gunnerthesnowman]

Why does mtntek say not to use it? I called them and all I got was its because it can cause some issues but didn't elaborate any further. Obviously there is a lean spot in the middle ok I got that, so how does the fix kit fix that without the controller and a decent map, you know what I mean? You would assume they would say for you to use the PC5 to aid in the fueling!

I do not know , but does the fix kit cylinder spacer / longer piston combo change the port timing , this would change your fueling , I know that the port timing is changed in the piston kit I run and I had to change my fueling .

 

[jerrydecoy]

I have the fix kit in my 09 d8. Before I put the turbo on I had an slp pipe/can and ran the 162 stoutner map and the sled was awesome! Ton more power then when it was stock

 

[jim9006]

I don’t think it changes the port timing because along with the spacer you get a taller piston which compensates for the spacer. What you do get is more piston surface (longer ) for less piston rocking (this brings multiple benefits) and more volume in the crankcase. This idea isn’t new as it was done back in the early 70’s when Yamaha introduced the GYT kit for the YZ125’s and I’m sure others have done this as well.
I believe the real reason MTK doesn’t want you using the PC5 is because they haven’t tested it and can introduce to many variables for them to deal with as far as support and warranty goes.

 

[Hondaracer315]

Okay sounds good. Yeah I'm looking to do the fix plus a PC V but keep the stock pipe and put a hps can on there. Clutch it out a little, timber sled intake, gear it too 19/45. Any ideas for 09 800 clutching I have some ideas for the primary but what about the secondary?

 

[diamonddave]

Chris,

The 08 mapping with 08 head and fix kit combo will run well at high altitude and not require a PCV. One of the reasons Polaris had so many maps was because the 08 map had very aggresive timing (when compared with '10 maps). This was back when Polaris was in a HP battle with skidoo and both had dropped their big bore sleds the previous year (900 and 1000). Both were trying to go over the 150 HP mark stock.

This aggressive timing coupled with the higher compression head (08-09) can result in DET and runnability issues at low alt.

Funny..... the 08-09's never broke skirts. We just scuffed pistons...(poor mapping). That problem didn't start until 2010 updates and M/Y 2010 motors.

PMS and MTNTK don't need a fuel controller at their riding elevations with 08 mapping.

One of the issues some people had in 08-09 was det in the mid range. Most of the time, you could clutch this out but many had to add a splash of race gas to fully rid of it.

I found at lower altitudes we ride, the '10 original mapping and the Power Commander with Dynotechs map or like Jim said, a lower adjusted mid range SLP map with a 08 head and fix kit is a screamer and longevity is like no other. These 2 maps in the PCV matched with the original 2010 mapping are way better than the 08 map at lower altitudes.

Here is a write up that I did when I installed the first fix kit. I've installed many now and all run well. The fix kit motors don't need near the fuel that a 2010 update motor/head needs.



http://www.snowestonline.com/forum/showthread.php?t=306964

Below is a post I made on BCR relative to this:

I've installed and tuned (4) 800 CFI-4's with fix kit's. Some (2) of these sleds have SLP pipe's and 08 heads, one has stock pipe and 08 head, and the other has 2010 update head and stock pipe. All sleds have Carl's Cycle clutching. We ride 2,500-6,500 feet with the most in the 4,500-5,500 feet. All of these sled's have a PC-5 with the 162 Stoutner map.


I know Shawn rec's the 08 mapping and feels the PC-5 isn't necessary.

I have found in all of these sled's that the original 2010 (first) mapping that came with the 2010 update kit with the PC-5 and the Stoutner 162 map to be the best running set-up. I've never seen DET (or heard) since the install was done.

The timing is very aggressive with the 2008 mapping. This is why 2009 mapping was better (turbo sled's this is the only map you can run in the CFI-4). It isn't near as sensitive.

One of the big issues we had with 08's and 09's BEFORE the 2010 update was DET. If loading the clutches didn't quite take care of it, we could add a gallon or 2 of AV Gas and get rid of it.


So, what could you guy's do to help this issue:

1) Run the 2010 original map with a PC-5 and the Stoutner Map.
2) Check Squish. It could be too tight with the aftermarket head and fix it.
3) The 2009 Map is not near as sensitive to DET as the 2008 map is. I didn't test this map with the PC-5 and Fix Kit but I would run this before I ran the 08 map.
4) Place a piece of cardboard between the head and the DET sensor. Make sure it is properly torqued.
5) Make sure the TPS is synched to the PC-5.
6) Do not run VES hoses plugged. This only works at very high altitude


These kits are the real deal. I am running them now in the Pro's with awesome runnability and reliability.

 

[Hondaracer315]

So in ak I usually ride low elevs but when I go to Whittier I climb to 4000', so should I run a PC V with the stoutner 162 map?

 

[TARI]

I do not know , but does the fix kit cylinder spacer / longer piston combo change the port timing , this would change your fueling , I know that the port timing is changed in the piston kit I run and I had to change my fueling .

Its good you admit "you do not know" some fix kits do not change port timing, that is why there is a spacer to accommodate the taller pistons and keeps the port timing the same as stock.
If your port timing is changed it affects the power curve and pipe. You could have left it stock without changing fueling.

 

[gunnerthesnowman]

I do not know , but does the fix kit cylinder spacer / longer piston combo change the port timing , this would change your fueling , I know that the port timing is changed in the piston kit I run and I had to change my fueling .

Its good you admit "you do not know" some fix kits do not change port timing, that is why there is a spacer to accommodate the taller pistons and keeps the port timing the same as stock.
If your port timing is changed it affects the power curve and pipe. You could have left it stock without changing fueling.

Yes , what I was saying was that I do not know if the combination of the taller piston and cylinder spacer that MTNTEK uses changes there kit port timing or not , I take it not. I did not go with there kit or any other kit that did not have to change the engine fuel requirement , I tried to go with a kit that killed two birds with one stone , ( piston/ cylinder problem and get a performance gain ) and to get better / more performance you have to increase the efficiency and or burn more fuel !

 

[St0rm77]

i too ran a PCV with the stoutner 162 map before i went to boost. as previously stated, the difference was night and day between stock and PCV with MTNTK kit; then, there was boost!