AF Gauge or EGT gauge

[TWARD700]

What seems to be the best way to tune in your sled AF Gauge or EGT gauge. Ran AF last year and liked it but doing a new pipe this year and might try the EGT. Thanks Terry

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[Holomis International]

What seems to be the best way to tune in your sled AF Gauge or EGT gauge. Ran AF last year and liked it but doing a new pipe this year and might try the EGT. Thanks Terry

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I've always ran both, but this year I will only be running EGT's, I find this the best way to tune, lets me know what each cylinder is doing at what rpm range, if I am getting a bog or bobble then I pull some fuel out, if I am running to hot at certain rpm ranges I dial a bit more fuel in. On our airplanes we run EGT and CHT and the EGT's are our main focus, if they stay around 1200 +/- then we have a happy motor.

Thanks

Jeff

 

[highmark00700]

I run both on my turbo. I used to only run egt's on my sleds with just motor work, but with a turbo I found that you can get realy high egt's with a rich burn. The reason why is all the fuel doesn't get completely burned in the cylinder and burns in the pipe making your egt's read high. It was tough to tell if it needed more or less fuel. I ended up putting a AEM afr on and it made tuning a ton easier.

 

[turbo800]

One nice thing about running both is, if there is any question about either sensor acting screwy you have something to compare to. Otherwise your back to more traditional methods.

 

[badass1000]

I have used nothing but afr on all my four stroke motorcycles. I have only used egt's on two stroke snowmobiles. Every thing has ben fine and egts work good. I would like to put one of my afr gauges or datalogers on my turbo xp just to see what the afr is.

 

[Octanee]

I have used nothing but afr on all my four stroke motorcycles. I have only used egt's on two stroke snowmobiles. Every thing has ben fine and egts work good. I would like to put one of my afr gauges or datalogers on my turbo xp just to see what the afr is.

if you run 1 gauge at first run a egt, egt does alot, it tells you when somethings leaning out, or when a injector goes or this or that, where as a a/f does not, ive heard stories, perticularily with the same snowmobile i am going to be turbo'ing, guy ran a a/f only, and ran it thinking yep the a/f is right, well, he melted his engine down, and others say, if he had a egt he would of seen it, but egt's work just as well for tuning sakes any how, you ask what your egt temps should be, usually like 1200, and run er at that

 

[turbo800]

I can see how an individual EGT's could help you catch a bad injector vs post turbo AFR sensor but, AFR's are very sensitive and should've seen a lean spike instantly. If its carbed and I only had one to pick from, AFR all the way. There was times only running EGT's I would have spike temps, I would keep throwing fuel at it til it wouldn't even run anymore. With a turbo and carbs you can force feed raw fuel all the way out into the pipe, giving a false reading. At that point its easy to pickup with a AFR gauge.