M1000 fuel pressure

[Turbo Monster]

What are people running for fuel pressure on your turbo. I have mine set at 45 psi. I have the boost-it box on mine and when I'm not on boost my afr are any where from 14.5-16.5. It scares the shet out of me. Neil says that sounds about right.

 

[smokindave]

I have my fuel pressure at 40lbs on one and 41 on the other.

 

[Arctic Thunder]

^ what he said.

40 PSI at an idle.

11.8-12.5 under boost. 14 and under on the trail.

Thunder

 

[428PONY]

42.5 at high idle. Where is your main fuel set.

 

[Turbo Monster]

I'm running a boost-it box

 

[Turbo Monster]

Is it possible to be running to much fuel

 

[Arctic Thunder]

When setting your fuel pressure you will need to adjust other settings to get the A/F correct.

Arctic Cat base fuel map calls for about 40psi. They have a range and it's pretty big but for the most part it is about 40 psi. So when you install a turbo (twisted kit) you install a raising rate pressure regulator. So as you gain boost the fuel pressure increases. Again on the twisted kit it is one psi of fuel pressure for one psi of boost. So at an idle it is 40 psi 0lbs of boost. At 9lbs of boost you should have 49psi fuel pressure.

If you have "to much" fuel pressure you will be really fat when not on boost, unless you are running a box that will cut fuel from the base cat fuel map.

Bottom line is you want 40psi at idle.

Thunder

 

[av8er]

41 psi at idle

perfect for Twisted turbo

 

[Hardass]

Does it matter what elevation it is set at I mean 40 psi set at 2000 feet will it still be 40 at 6000 at idle?

 

[RACINSTATION]

Elevation will matter. The higher the elevation the lower the pressure. It is slight, but it is different. If you are running 41-43 psi you are fine.

 

[Polarisrocks]

Well i had mine out with the boost it and it ran amazing.... I have my pressure set at 41 psi at 5000 ft. Its about 42-3 in my garage and drops a bit at the 5000 altitude. I was out with a twisted m1000 with a dobec, a piped m1000 with a power commander , and mine and all of us were seeing 15-18 on the trail and running great. I think when the power valve is opening at 4800-5000 the a/f rises a few points.. Most engines wont even run at that a/f, but for some reason the 2 strokes is ok there. I tried adding alot of fuel to fix it and it didnt come down at all so it went back to -10.. I am never holding the throttle at one position anyway, i keep moving to avoid a long duration at one throttle position.

Jim

 

[428PONY]

What i was referring to was the main fuel table on your boost it box. problably set at 85. your fine adjustments are at every 250rpm increments. By raising the main fuel to say 90 your entire table moves richer. I run 42.5psi at 2500feet. I run a higher main table than 85 on my boost it box but that works for me.

 

[Turbo Monster]

Well i had mine out with the boost it and it ran amazing.... I have my pressure set at 41 psi at 5000 ft. Its about 42-3 in my garage and drops a bit at the 5000 altitude. I was out with a twisted m1000 with a dobec, a piped m1000 with a power commander , and mine and all of us were seeing 15-18 on the trail and running great. I think when the power valve is opening at 4800-5000 the a/f rises a few points.. Most engines wont even run at that a/f, but for some reason the 2 strokes is ok there. I tried adding alot of fuel to fix it and it didnt come down at all so it went back to -10.. I am never holding the throttle at one position anyway, i keep moving to avoid a long duration at one throttle position.

Jim

Your seeing 15-18 what. Afr

 

[WyoBoy1000]

Just depends on the controller and setup, I like to run as much fuel as possible without effecting performance, thats my way of knowing, go to fat then cut it back.

 

[Polarisrocks]

Yes 15-18 afr..

What i was getting at is your going to be high on your afr's and be ok on the trail. I tried richening up my 4750-5250 trims to +35 and it didnt help with the high afr area.. So i lowered them back to the
-10 i was runnning to start out with. Rusty rider said yesterday he saw it too last year with his dobec and had egts too and they were in check..below 1200.. I guess the big thing is keep your fuel pressure high enough that it runs great without boost, then fine tune your trims to make it perfect.. If you lower your pressure 1-2 you may have to raise your gain number to compensate across the board..

EDIT:Well after a few conversations with Neil I had to change a few setting to make the box add fuel down that low.. so it makes sence why my afr wasnt changing..
Jim