If your M series is bogging, please read this.

[BigRed118]

There are a lot of threads going on about bogging. Whether it is an 07', 08', or 09' they can be traced back most of the time to the same thing. Fuel Pressure. For some reason, A/C has a large variable here. If your fuel pressure is high, you will bog!!!!! There are a couple ways of checking this:

1) your dealer can check it.
2 you can put a fuel pressure guage in your fuel line

Ideally a fuel pressure regulator should be installed on all of these sleds so that the base pressure is the same.

Now, this is a problem whether your sled is stock or modded. If you want to run some mods without a EFI box, make sure that your sled is running the same fuel pressure as the company that tested the product. i.e. SLP's M8 was between 44-45lbs for there single pipe.

I hope this helps

 

[powdersphinx]

thats good info to remember. thanx

 

[Mountain Doo-OLD]

Indeed

Also remember you can put on a fuel control box to regulate the fuel without any mod's.
Simply putting on a fuel regulator will not ensure burndowns/ bog's with pipes -heads..ect.ect.
YOU NEED a fuel control box to change the fuel curve. ( how long the duration of the spray is ongoing)

If you put on a pipe and run the stock fuel pressure-- how is a sled making more HP?
I for one cannot see SLP pipes making more power with the stock fuel pressure unless your so rich to begin with, to have the pipe compensate for the additional fuel....now that is a wide subject to discuss.

Simply jacking up the fuel pressure to induce more fuel cause of your mod's is not going to give you the complete package that it deserves.
Unlessyou CONTROL the fuel curve/ and knowing you fuel psi first, is the best way to start. Someones boondockers numbers are no good to you unless you have the same base fuel pressure.. you need to reduce fuel in certain area's also

Trying to get rid of the bog is easiest with a fuel controler- IMHO
But there are some sleds that cannot have the bog tuned out completly - better but not completly...and must be driven around the dreadful bog stage.

CAt's fuel curve programs are all over the place- and need attention- there are alot of sleds out there that no matter what you adjust- just send you over the bars with a bog from hell when making a steep climb....

MD

MD

 

[BigRed118]

I appreciate what you are saying Mtn Doo, but what you are missing is this is just for a base line. The reason pipes make more hp with no extra fuel is there is too much fuel to begin with. When people are asking what other have for settings the suggestions won't work unless the fuel pressure is the same. It would be like two people running carbs, one with 450 main jets and one with 400's and telling them to adjust the mixture screw to help. Right now there are a lot of people on this forum that are having a tough time getting there M's to run right. This is almost a necessity.

 

[alexhack]

Some good info here. I just recently installed a pressure gauge on my stock M8 and it is at 44-45psi like SLP's. I do notice a slight bog off bottom, feather the throttle and its gone. It is like it is loading up, so it being a rich bog makes sence. Thanks for the info.

 

[akMcat]

oil pump

another thing that you can do is check your oil pump calibration, a riding buddy got an 09 m1000 and it would load up while putting around. we checked the oil pump and the marks weren't lined up correctly on the pump arm, readjusted to correct alignment and presto bog was gone and oil consumption cut almost in half. Someone at the factory was getting lazy with oil pump calibration!!!

 

[alexhack]

another thing that you can do is check your oil pump calibration, a riding buddy got an 09 m1000 and it would load up while putting around. we checked the oil pump and the marks weren't lined up correctly on the pump arm, readjusted to correct alignment and presto bog was gone and oil consumption cut almost in half. Someone at the factory was getting lazy with oil pump calibration!!!

I might have to check this as well. I've noticed that my M8 goes through a chit load of oil. Approx. 1/2-2/3 tank of oil per tank of gas. But I'm swiching to premix so a little extra oil won't hurt for now.

 

[1080paul]

This is all good information but in reality we shouldn't even have to have this conversation about a new $10,000+ "EFI" sled. All these sleds should have an adjustable fuel regulator and it should be part of dealer prep to have it set right. This EFI system is not new. It has been around since 1997. If I bought a new car or truck and it ran like this I wouldn't go out and spend hundreds of dollars on aftermarket parts to correct it. That's what were doing here...aren't we??

I'm talking about a stone stock NEW sled.

 

[Treebender]

Good information. My 1K bogs at 4000 rpm, the fuel pressure is at 44psi, and I have monitored oil consumption. If I'm correct, the laydown engine (M8 & M1000) should be at 42:1 fuel to oil ratio. Make sure you monitor fuel used per oil in oz to ensure you have to correct ratio.

It seems that all M1000's bog around 4000 rpm. Can someone take their sled and ride 3 miles at exactly 4000 rpms and shut the motor off without moving the throttle (Yes, hit the kill switch while the sled is rolling), and pull out the plugs and determine if this is a lean or rich condition? Can you post the pictures of the what the plugs will look like?

 

[SWEETXPBEATCH]

Yet another re-map is in the works

Good information. My 1K bogs at 4000 rpm, the fuel pressure is at 44psi, and I have monitored oil consumption. If I'm correct, the laydown engine (M8 & M1000) should be at 42:1 fuel to oil ratio. Make sure you monitor fuel used per oil in oz to ensure you have to correct ratio.

It seems that all M1000's bog around 4000 rpm. Can someone take their sled and ride 3 miles at exactly 4000 rpms and shut the motor off without moving the throttle (Yes, hit the kill switch while the sled is rolling), and pull out the plugs and determine if this is a lean or rich condition? Can you post the pictures of the what the plugs will look like?

From the sounds of it, this anticipated "re-map" isn't going to be a cure all.
My pressure was 46psi. Funny, started it up today and it acted like it had been completely summerized and fogged. ONce it cleaned up, it ran pretty good.
Two questions, what track to replace the stocker crap job
and what fuel box would you guys recommend and how much?

 

[Griff]

I'm with 1080Paul.

 

[Mountain Doo-OLD]

I'm with 1080Paul.

Me also- over 10K on a sled and we have to mess with it even in stock form!!


But don't kid yourself and think if your sled has 44-45 fuel pressure you can run a SLP pipe with no Issues... Good Gawd man- you need to trim the settings ACROSS the fuel entire Band

MD

 

[summitchaser]

My buddy has a 06 m7 he was running 92 in it last year for a bit. had problems with it bogging down at mid range rpms. The problem left and now it has come back. He says it idles hi and and mid range rpms it boggs down.

Where should he start in trouble shoot ting this problem?

I am not a engine guy by any means so my question is, does the octane make that big of a difference?

What damage could this have done?

also he has stock can and pipe if that makes a difference

 

[SWEETXPBEATCH]

ditto

Me also- over 10K on a sled and we have to mess with it even in stock form!!


But don't kid yourself and think if your sled has 44-45 fuel pressure you can run a SLP pipe with no Issues... Good Gawd man- you need to trim the settings ACROSS the fuel entire Band

MD

my sentiments exactly

 

[dogtownbutcher]

run 87 octane fuel on a stock cat!

Can someone post a pic of the fuel pressure regulator and where to install it?

 

[garciava]

Good info,
My 09 m8 has a really bad bog at times when taking off. Today in 4 feet of powder it sent me over the bars twice and stuck me a couple times also. My 07 M8 doesn’t do this

I am running an SLP pipe set up and MTX wts set at what SLP recommends for 10000' ridding.

I have a question that hopefully someone can help me with
Is the bog from lack of fuel or too much fuel?

I have a boondocker fuel box set up on teh sled but have not used it.

Any help will be appreciated

 

[tar]

bikeman performance has the kit.

 

[ndmtnsledder]

Excellent information never thought of that really. The Pressure and what a fuel controller do are slightly unrelated the pressure is pretty self explanatory but the controller adjusts the map which determines the injector pulse length. Longer pulses let more fuel in and more pressure pushes more in during any period of time. Anyway info everyone probably already knew.

I was wondering do the new engines have the same problem the 05-06 M7s had were the TPS sensors had a wide range of baseline settings. I had heard from a few people this is why some ran better then others and why some took to mods easier then others. I know the local mechanic was adjusting the TPS's on sleds as he set them up.

 

[rusty rider]

gota 06 m7 and the bd box worked great on it, i had to subtract fuel from the entire rpm range. the higher the rpm range the more fuel i had to subtract, still kinda loads up a little when you first take off but goes like a raped ape from there.

 

[RockyMtn.Kris]

Good thread. I fought my M1k (twin pipes/attitude controller) all last year untill I got a pressure regulator. I use the one from Bikeman. Went from 46 to 42 psi and its comming together nicely.