ricer68
Pro
- Joined
- Mar 23, 2016
- Messages
- 133
- Reaction score
- 26
- Points
- 353
- Location
- Wabash Indiana
- Country
- USA
- Snowmobile
- 2007 Yamaha Apex GT
- LOCATION
- North East Indiana
Sounds good! Yeah I wasn’t figuring on pushing the boost. Knew they said 6 and below was safe so that’s were I wanted to keep it below. Just want a good running sled that I don’t have to worry about much.My Ulmer mapping right out of the box was spot on in my opinion as well, ran 8 psi up to 12 psi and never actually needed to change I thing. I did lean my out some in the cruising rpm range where there was little to no boost, wasn’t necessary but I do feel it helped my mileage by 1-2 mpg on a full tank of gas. As for boost..I’m assuming you have a boost gauge? If so, set it at 5 psi and enjoy it..don’t get greedy and try to run 6 or higher if you do any long pulls of any kind, also don’t be afraid to run high 10’s/low 11’s wot afr..a little rich won’t hurt a thing, leaning it out at wot is only going to gain minimal amounts of power and you’ll never notice the gain. Keep the wot fueling safe and if you want to tune anything focus on the mid range/cruising fueling as that’s where you’ll notice the increase in mpg and throttle response..of course you need an afr gauge to monitor that and if you don’t have one or intend on getting one then just set boost and go, Ulmer’s mapping will treat you very well!
Studroes144
TY 4 Stroke God
- Joined
- Oct 30, 2013
- Messages
- 2,897
- Reaction score
- 955
- Points
- 973
- Location
- Lowville, NY Tug hill snowmobiling
Sounds good! Yeah I wasn’t figuring on pushing the boost. Knew they said 6 and below was safe so that’s were I wanted to keep it below. Just want a good running sled that I don’t have to worry about much.
Even at 6 it’s borderline..in a perfect world you don’t have anything to worry about at 6 psi, note the word “perfect”, however if u get a questionable tank of gas, real warm day of riding or clutching that isn’t setup properly you can ruin an engine in a hurry. 5 psi with the mpi race muffler should make for a very strong running machine. And I got a feeling you’ll see increased throttle response as well as slightly lower fuel consumption with Ulmer’s mapping.