Bnorth
Active VIP Member
Good job listening and learning.Umm pretty sure the coyote is a 4 stroke engine.............
Good job listening and learning.Umm pretty sure the coyote is a 4 stroke engine.............
Well he said we weren't talking 4 stroke turbos, I learnt that engine is a 4 stroke......Good job listening and learning.
We’re not talking about stupid 4 strokes here for one. Using larger injectors down NOT make it run like **** a bad tuner makes it run like **** or a box that doesn’t have full control. The at the automotive stuff stock junkyard LS and coyote engines throw a turbo on it larger injectors and HP tuners 800-1000 wheel ho all the time. My Axys with larger injectors runs stock sled clean isles good and can hit the throttle nothing to wide open as fast as you want and on and off as much as you want. 50 plus days riding the mtntk Axys not once has it ever had a bog. Even all the non turbo guys or haters in our grip say if they do a trunk it be a mtntk and they all wish mtntk made turbos for the 8****ty too
I have some great deals on the RB3 that works with awesome with big injectors. Interested in a bulk buy?
We’re not talking about stupid 4 strokes here for one. Using larger injectors down NOT make it run like **** a bad tuner makes it run like **** or a box that doesn’t have full control. The at the automotive stuff stock junkyard LS and coyote engines throw a turbo on it larger injectors and HP tuners 800-1000 wheel ho all the time. My Axys with larger injectors runs stock sled clean isles good and can hit the throttle nothing to wide open as fast as you want and on and off as much as you want. 50 plus days riding the mtntk Axys not once has it ever had a bog. Even all the non turbo guys or haters in our grip say if they do a trunk it be a mtntk and they all wish mtntk made turbos for the 8****ty too
Well he said we weren't talking 4 stroke turbos, I learnt that engine is a 4 stroke......
I still want to hear how you can put much larger injectors in and still not over fuel on the low end? As I understand injectors only have so much turndown aka pulse width.
Can someone please clarify I am interested.
Wouldnt an automotive application be much more forgiving as far as the throttle response needed? I cant think of anything more unforgiving than the snowmobile market. Even the slightest bog at the wrong time can cause all kinds of problems.
Ok so which injectors come stock on a sled?To a point yes. Since we're mixing cars and sleds and 2 vs 4 stroke (or skinny chicks vs big chicks apparently) now there are different styles of injectors. High impedance (saturated) injectors like the common bosch style on sleds have less control than low impedance (peak and hold) injectors. Low impedance require more current to open and as such move faster offering more control. Most big horsepower car guys running boost also use boost referenced fuel pressure control so at low boost or vacuum they run less fuel pressure and can get away using big injectors with limited pulse width and then can ramp up fuel pressure to get more flow at high boost.
Ok so which injectors come stock on a sled?
Not sure, but nearly all vehicle oem's use high impedance as they are simpler and cheaper.
Here is my question.
Your factory injectors have x amount of mass flow rate and a minimum mass flow rate.
If you simply put in bigger injectors wouldn't they have a bigger maximum mass flow rate as well as a higher minimum mass flow rate.
Unless the sled was running lean on the bottom end to begin with how can it handle the extra fuel?
The problem here is that you are assuming the stock injectors are required to operate at their minimum flow rate which is likely not the case. A bigger injector can likely be operated to provide as little fuel as required by the motor in vacuum as long as it is not hugely larger than the stock injector.
IMO you don't need the fuel on the bottom end till you start building boost, then you need lots more.
So what's the best way to tackle that?
1 set of big injectors?
I'm partial to one set of large injectors unless they require too large a spread in flow rates then run staged injectors with small primary injectors and then larger secondary injectors that come on as needed.
Or two sets of smaller injectors that can yield the same mass flow rate as the big injectors?
(Why did the doo 850 go this way?)
So now we are also bringing direct injection into the mix. They do not use conventional fuel injectors and technology has not evolved enough to produce direct injection that flows high rates of fuel. They are limited to being rather small and as such we see boost injectors in high performance applications and added via the aftermarket when certain oem applications cannot meet big power requirements.
My belief is the 850 runs boost injectors because the voice coil direct injectors cannot respond quick enough for the desired throttle response and can not flow enough to support the top end so they take some of the load off the direct injection system.
Sliber did this........Responses in red.
I think we will see someone crack the 850 ecm and reduce primary (direct injection) fueling to compensate the low end for the added restriction of the turbo system and then install larger boost injectors to supply the additional fuel required for throttle response and top end performance.
Ok so which injectors come stock on a sled?
Here is my question.
Your factory injectors have x amount of mass flow rate and a minimum mass flow rate.
If you simply put in bigger injectors wouldn't they have a bigger maximum mass flow rate as well as a higher minimum mass flow rate.
Unless the sled was running lean on the bottom end to begin with how can it handle the extra fuel?
IMO you don't need the fuel on the bottom end till you start building boost, then you need lots more.
So what's the best way to tackle that?
1 set of big injectors?
Or two sets of smaller injectors that can yield the same mass flow rate as the big injectors?
(Why did the doo 850 go this way?)
Haha, hopefully he gave you a sweet deal for it being such a POS.Chiming in a little late here.
I am the the guy that bought this kit that there was so much questions about. Today was my first ride on it. I didn’t notice an issue. The kit was seamless install. Every thing works as advertised. And install is clean. @ KTMSX350f I don’t see any issues with it. Perhaps comparing your kit on the axys to this kit is applies and oranges.
I’m very happy with it and does exactly as it was advertised. I’ve never met Dave but know many who have I feel your experience could possible be a personal issue. Kits fine runs great. Sure some small issues when hot on bottom as gargle with the high elevation kit but none the less that will be splitting hairs to be chewing ass about that.
If you want a perfect running boosted engine. My suggestion is build the engine to suit. Perhaps something was with the engine. But I don’t see any problems other than it’s exactly as you told me when I bought it from you. Fast spoiling. Great AFR and pulls hard.
Im happy you told me that and that’s what I’ve experienced. Just shocked that the sale did not entail the feelings expressed in the last 100 posts.
You sold me on the kit as it was great. My experience is just. Seeing the posts here are shocking. I did wait to test it to be sure and im not sold on what’s being communicated here.
Thaks for the great kit though. Im happy with it.
Chiming in a little late here.
I am the the guy that bought this kit that there was so much questions about. Today was my first ride on it. I didn’t notice an issue. The kit was seamless install. Every thing works as advertised. And install is clean. @ KTMSX350f I don’t see any issues with it. Perhaps comparing your kit on the axys to this kit is applies and oranges.
I’m very happy with it and does exactly as it was advertised. I’ve never met Dave but know many who have I feel your experience could possible be a personal issue. Kits fine runs great. Sure some small issues when hot on bottom as gargle with the high elevation kit but none the less that will be splitting hairs to be chewing ass about that.
If you want a perfect running boosted engine. My suggestion is build the engine to suit. Perhaps something was with the engine. But I don’t see any problems other than it’s exactly as you told me when I bought it from you. Fast spoiling. Great AFR and pulls hard.
Im happy you told me that and that’s what I’ve experienced. Just shocked that the sale did not entail the feelings expressed in the last 100 posts.
You sold me on the kit as it was great. My experience is just. Seeing the posts here are shocking. I did wait to test it to be sure and im not sold on what’s being communicated here.
Thaks for the great kit though. Im happy with it.
The 800 etec had a low end garble even with the wrong can.....I didn’t notice anything more than small garble. I was understanding it it because the high elevation kit. There was no bog. Ran very well. Not too sure what other issues were had before but I must say I’m very pleased.
Some. Not all. Not sure why.The 800 etec had a low end garble even with the wrong can.....