Jetting with Wideband

[lakercr]

I don't know if this information has been collected in a previous post - if it has, I didn't see it...

I'd like to get some concensus on what readings everyone is finding their best performance at. Can some of you guys that have been tuning for a while with these gauges post your jetting/readings/elevation/boost? I have a customer's Powderlites kit to dial in, and I'd like to remove the carbs as little as possible in the process....

Thanks guys.

 

[Travis Moore]

Not sure if this will help you at all, but stock jetting at 500 feet elevation@12psi on a GT25 gets me high 10's AF@WOT

 

[lakercr]

Not sure if this will help you at all, but stock jetting at 500 feet elevation@12psi on a GT25 gets me high 10's AF@WOT

I'm starting at 135, 17.5, 1.5 turns and center clip position, 5lbs fuel.

I can't field test until I get some extroverts (and some snow). I was t hinking that since it is in the shop anyway I might throw in a different setting if there are enough guys that have found a set-up they like.

700' elevation, GT25R (Powderlites) running 10-12 lbs.

 

[Travis Moore]

Not sure if this will help you at all, but stock jetting at 500 feet elevation@12psi on a GT25 gets me high 10's AF@WOT

I'm starting at 135, 17.5, 1.5 turns and center clip position, 5lbs fuel.

I can't field test until I get some extroverts (and some snow). I was t hinking that since it is in the shop anyway I might throw in a different setting if there are enough guys that have found a set-up they like.

700' elevation, GT25R (Powderlites) running 10-12 lbs.

My guess is that you'll be on the rich side.

If it's a customer sled-that may be a good idea if you know what I mean

 

[lakercr]

Not sure if this will help you at all, but stock jetting at 500 feet elevation@12psi on a GT25 gets me high 10's AF@WOT

I'm starting at 135, 17.5, 1.5 turns and center clip position, 5lbs fuel.

I can't field test until I get some extroverts (and some snow). I was t hinking that since it is in the shop anyway I might throw in a different setting if there are enough guys that have found a set-up they like.

700' elevation, GT25R (Powderlites) running 10-12 lbs.

My guess is that you'll be on the rich side.

If it's a customer sled-that may be a good idea if you know what I mean

Yep, and that's where I want to be! Rich is the side I want to be on when I start dialing it in.

 

[hlmrx1]

Not sure if this will help you at all, but stock jetting at 500 feet elevation@12psi on a GT25 gets me high 10's AF@WOT

I'm starting at 135, 17.5, 1.5 turns and center clip position, 5lbs fuel.

I can't field test until I get some extroverts (and some snow). I was t hinking that since it is in the shop anyway I might throw in a different setting if there are enough guys that have found a set-up they like.

700' elevation, GT25R (Powderlites) running 10-12 lbs.

Jim, I'm running 130, 17.5 Pilot (if that's stock for pilots that's what I'm running, 1.5 turns ??? stock specs is 2.5 ??? I think mine are at 2, clip down one to richen up at mid rpm (runs lean at 6500 to 7500 and pops otherwise) 5lbs. fuel should be good. I forgot to, there's a pilot jet that goes in one of the lines for main jetting so you don't have to pull the carbs. Call me and I'll give you details. I was told to start at 128 but went with 130's and it seems to be fine. You've seen it run!!!!!
Don

 

[Trxster]

[/quote]

I forgot to, there's a pilot jet that goes in one of the lines for main jetting so you don't have to pull the carbs. Call me and I'll give you details.
Don[/quote]

???????

 

[lakercr]

I forgot to, there's a pilot jet that goes in one of the lines for main jetting so you don't have to pull the carbs. Call me and I'll give you details.
Don[/quote]

???????[/quote]

I think Don is referring to a restrictor in the pitot line from the charge tube.

 

[lakercr]

Not sure if this will help you at all, but stock jetting at 500 feet elevation@12psi on a GT25 gets me high 10's AF@WOT

I'm starting at 135, 17.5, 1.5 turns and center clip position, 5lbs fuel.

I can't field test until I get some extroverts (and some snow). I was t hinking that since it is in the shop anyway I might throw in a different setting if there are enough guys that have found a set-up they like.

700' elevation, GT25R (Powderlites) running 10-12 lbs.

Jim, I'm running 130, 17.5 Pilot (if that's stock for pilots that's what I'm running, 1.5 turns ??? stock specs is 2.5 ??? I think mine are at 2, clip down one to richen up at mid rpm (runs lean at 6500 to 7500 and pops otherwise) 5lbs. fuel should be good. I forgot to, there's a pilot jet that goes in one of the lines for main jetting so you don't have to pull the carbs. Call me and I'll give you details. I was told to start at 128 but went with 130's and it seems to be fine. You've seen it run!!!!!
Don

I'll give you a call tomorrow Don.

 

[TurboJamie]

For readings on the wideband I shoot for 12.1 at WOT I run 13-14 in the mid cruising and 12-13 at idle on the WB seems fine for my setup.

 

[hlmrx1]

I forgot to, there's a pilot jet that goes in one of the lines for main jetting so you don't have to pull the carbs. Call me and I'll give you details.
Don

???????[/quote]

I think Don is referring to a restrictor in the pitot line from the charge tube.[/quote]

That correct Jim the restrictor in the pitot line from the charge tube.

 

[TWIN TURBO]

I would agree with the general ballpark ratio's that a7m266d posted, but would caution everyone not to fall in love with your wideband AF Ratio's, oxygen sensors do not give AF Ratio's instead they tell you the partial pressure ratio of oxygen inside the pipe compared to the air outside the pipe. Their are factors such as oxygenated fuels, stoichiometry of fuels to name a couple that affect things lots.

 

[lakercr]

I would agree with the general ballpark ratio's that a7m266d posted, but would caution everyone not to fall in love with your wideband AF Ratio's, oxygen sensors do not give AF Ratio's instead they tell you the partial pressure ratio of oxygen inside the pipe compared to the air outside the pipe. Their are factors such as oxygenated fuels, stoichiometry of fuels to name a couple that affect things lots.

FJO publishes conversion tables for their control system to accomodate different fuels (propane, methanol, Ethanol, Diesel). I can talk to them about conversions for race fuel and see if they might have something to offer.