Question for Dynotech Jim?

[powerstroke 350700]

Just wondering if you were going dyno test a stock 2010 D8 RMK for the PCV to see if there are any differences between a true 2010 and the updated 2008 & 2009 D8's? Thanks Jim
I have a PCV but waiting to see what you find out for settings to enter into the PCV I have a mid range stumble somewhere from 6800 to 7500rpm

 

[Steep&DeepRider]

?'s

ttt

 

[dynotechjim]

There is no discernible difference between the 2010 D8 and the early ones that were updated with the 2010 parts as evidenced by the AmSnow Adirondack Shootout stocker we dyno certified before the Shootout, without and with our typical PCV fuel correction (10 HP added on top end) as posted on my website in December.

But it appears that some D8s are a bit different in midrange A/F ratio. Some are finding it useful to tweak the maps I have sent in their PCVs to help different RPM lean or rich areas. I've got maybe 100 guys trying the latest mid Jan Polaris flash with a preliminary PCV map, and the feedback I've gotten will help define a good average midrange tune to make that latest flash drive dandily with PCV for most people, and I will try to post that map on my website next week.

Also I'm trying to get a D8 this week to create a PCV tune for an Aaen single and CPI twin pipes.

 

[gerrman]

Jim

I have a 09 D8 c/w SLP pipe that has run awesome from day one( a new leftover last fall). There has never been as much as a stumble, hicup or a bog. Plugs are good. I live in Northwest BC Canada, coastal weather. Sled between 3000-5500 feet. My question for you is this: What is to be gained in terms of runability and performance for a sled like mine this is running so well now with a PCV? I know there are many other D8's out there that run just as well if not better. Thanks for your input.

There is no discernible difference between the 2010 D8 and the early ones that were updated with the 2010 parts as evidenced by the AmSnow Adirondack Shootout stocker we dyno certified before the Shootout, without and with our typical PCV fuel correction (10 HP added on top end) as posted on my website in December.

But it appears that some D8s are a bit different in midrange A/F ratio. Some are finding it useful to tweak the maps I have sent in their PCVs to help different RPM lean or rich areas. I've got maybe 100 guys trying the latest mid Jan Polaris flash with a preliminary PCV map, and the feedback I've gotten will help define a good average midrange tune to make that latest flash drive dandily with PCV for most people, and I will try to post that map on my website next week.

Also I'm trying to get a D8 this week to create a PCV tune for an Aaen single and CPI twin pipes.

 

[thefullmonte]

Jim

I have a 09 D8 c/w SLP pipe that has run awesome from day one( a new leftover last fall). There has never been as much as a stumble, hicup or a bog. Plugs are good. I live in Northwest BC Canada, coastal weather. Sled between 3000-5500 feet. My question for you is this: What is to be gained in terms of runability and performance for a sled like mine this is running so well now with a PCV? I know there are many other D8's out there that run just as well if not better. Thanks for your input.

Even the ones that are running good have a very lean mid range. Scary dangerous lean!!! Whether you notice an issue while it's running or not, I would think you are sacrificing longevity of the motor as well as reliability.
There is more to be had as well. Nice increases through the mid range and about 10HP on top. Just like jetting your sled back in the old days to make it run better. Unfortunately, it's more expensive.

 

[powerstroke 350700]

Jim can I run the D8 PCV program for an SLP single? Sled has 1/11/10 flash it is a stock sled, 2010 D8 to get mid range figured out with no damage to the motor?

 

[powerstroke 350700]

ttt

 

[thefullmonte]

Jim can I run the D8 PCV program for an SLP single? Sled has 1/11/10 flash it is a stock sled, 2010 D8 to get mid range figured out with no damage to the motor?

I would run the map from Jim if it is a stock sled. SLP states their map will not work with the stock setup and is designed for their pipe. I'm sure the SLP has different fuel requirements to optimize their pipe than what the stock pipe is capable of.

 

[gerrman]

I live in Northwest BC Canada, coastal weather, 120 miles inland. Sled between 3000-5500 feet.

Who's map for the PCV is having better results, Dyno Jim or SLP's for the mountain riders. Does it really mattered which supplier people have been buying from in terms of their fuel Map needs? After getting Montes response that there is still a BIG mid range lean issue even if your sled is running well. It really has me thinking now, what to do????

 

[powerstroke 350700]

Jim said the PCV map for stock sled is not ready yet but I have his map for a sled with a SLP pipe thought I could use it as a baseline to start? all for the latest reflash!

 

[dynotechjim]

we've got over 100 guys running our pcvs with the 1/11 or whatever date last reflash, and we still have 5-10 guys having strange issues at various rpm. 90 or more are driving happily and powerfully, but the others are experiencing annoying burbles at specific, but very different from one another RPM and throttle position. I really would like to tweak our maps to accommodate all 100 before we settle on a final map.

Minnesota Polaris dealer Chad (who helped us with last year's final 09D8 Wayne/ Casey/ Chad PCIII map that worked so dandily) just came back from a weekend riding in Idaho with 5 customers D8s with both 2010flashes and he had them all running clean and good with slightly tweaked versions of our 2010 reflash PCV map. Chad is sending me his tweaks tomorrow to see if we can incorporate them into our final PCV map before it is posted on my website.

But for now any DTR member who wants to try my latest can just email me with DTR User ID and I will send what we have, and we need everyone's feedback in our goal to create 100% perfection with the PCVs we send out.

Remember--our two stroke engines run clean with A/F ratios from about 10/1 to 17/1 and will suffer misfire below and above those numbers. And as Monte suggests even if you are running cleanly in the midrange you might be 16.5/1 and at best causing midrange detonation turning on your light or at worst being so lean that deto will not occur and set off the excellent deto protection but just overheat and swell the piston(s) causing them to quietly seize in the bores.

We would like to create 13.5 or 14/1 A/F ratio in all midrange conditions but that is nearly impossible because of the ex valves popping open later than expected, or closing early backing off the throttle (remember the infamous Stoutner midrange negatives from our last map last year?). But if we can tune this D8 PCV in to get EVERY D8 sled to operate at 12.5/1 -14.5/1 EVERYWHERE in the midrange then everyone (except the EPA) will be pleased.

As I've been suggesting, we are getting very close.

 

[powerstroke 350700]

Thanks Jim for all the hard work. I have another question is there a difference at all between the 800 rmk 800 switchback and 800 flat land programing, injectors, ecu, ect...... I dont know just a thought that crossed my mind? thanks Jim sorry about all the questions!

 

[Jeff95]

Jim,

I have a Aaen single pipe with Super Q silancer. I have the latest flash and did not notice a power/RPM difference after installing pipe.
Do I need to tune ECU for that pipe?
Update me on what you found after tuning a D8 with the Aaen pipe.
The Aaen guys had no idea maybe I should of got a SLP.

I ride in Oregon 6000-8000 feet if lucky I can get the RPM up to 8000.

Thanks

 

[LongTrack]

Jim,
I just received my PCV with your newest mapping. The one I received is for the newest map from Polaris. Should I wait until more updating is done or is it fine to use as is. Have not installed it yet, just curious....

 

[dynotechjim]

Thanks Jim for all the hard work. I have another question is there a difference at all between the 800 rmk 800 switchback and 800 flat land programing, injectors, ecu, ect...... I dont know just a thought that crossed my mind? thanks Jim sorry about all the questions!

as far as we have seen, so difference in mapping now whether flatland sleds or mountain sleds. that explains why we can send the same PCV map to all altitudes to fix midrange leanness and top end richness.

 

[dynotechjim]

Jim,
I just received my PCV with your newest mapping. The one I received is for the newest map from Polaris. Should I wait until more updating is done or is it fine to use as is. Have not installed it yet, just curious....

Ride it with your current ECU flash, and if it is smooth to drive in the midrange just leave it. There will be no advantage to going to the newest flash. If anything the newest flash, incredibly, appears even fatter on top so we may need to reduce fuel flow even more. Please, Polaris, no more flashes.

 

[Litre1000]

I just installed the PCV you sent me today on my 09 Assault. Went for a short ride tonight. WOW, what a difference! The sled runs much, much better. Thanks for your efforts. Going north this weekend and really looking forward to it!

 

[teamescape]

Jim, I was checking to see if you have any mapping for my setup. 09 d8
I have Carls upper porting, slp pipe and can. Do you think your current maps would work? I am going to purchase a pcv and i would like to see what is available before i purchase one from you. Thanks Paul

 

[SledAddicts]

I've have the PCV with the DTR-Stoutner map installed on my updated Assault and it made a significant difference, excellent shift out RPM @ 8100+, eliminated the midrange stumble issue completely and more top end punch.

However, I notice at RPMS 6500-7400 cruising across a lake or field the motor feels like its surging, seems like a midrange surge/pulsating. WOT is just rips.

I did the TPS reset on the PCV and that got rid of my rich starts and fouled plugs, but it still doesn't feel perfect in the mid.

Have there been any reports of this symptom?
We have been having very cold temps -10 to -20 celcius, and I was wondering if the colder temps were causing a over-rich condition in the mid if the ECU is adapting AF ratios.

I heard someone state that the ECU richens up the AF alot below 0 degrees celcius. Is this true?

Maybe I need 2 maps, one for really cold temps and another for normal temps?

 

[Sula Tom]

I am Very new to this site and these forums, but I would like to thank Dyno Jim for all of his time and hard work to try and get these d8 running good. Jim, I am a member of your web site, and was just wondering if the maps that are on your site right now are for for the current reflash, and if those programs would work with the slp high compression heads. Thank you to everyone for all of their hard work