High erratic idle after changing fuel??
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High erratic idle after changing fuel??
I have an Ofna Hyper 7 TQ sport with the mach .28. I just finished the first gallon of fuel which was o'donnell. I stopped at a different hobby shop closer to home and bought the Traxxas top fuel 20% same nitro as the o'donnell. Filled the tank and ran it around the yard for a couple of minutes and then it started running a high idle as if it was leaning out? I found a hole in the fuel line near the carb. Changed out all the fuel line with new, Checked that the head screws were tight, Checked the exhaust gasket and spring for a secure connection, i have reset the carb to factory and none of these thing have helped. The problem started with the fuel change...? Should i get some o'donnell and trash the Traxxas? This problem really has me stumped. Thanks in advance for any advice that can be given
Thanks,
Brian
Thanks,
Brian
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RE: High erratic idle after changing fuel??
I'd chalk it up to the different fuel. Although the nitro % might be the same, the oil% might be different. Just re-adjust your tune a little bit and it should be fine. Or go back to your old fuel.
For the idle:
If the idle is staying high and not eventually dropping, try richening the LSN a bit. If the idle is high after a WOT run, and then eventually drops, richen your HSN a little bit. Soemtimes a bit of both can help.
High Speed:
Don't forget your HSN for high speed running with the different fuel. It may be running a bit lean too. Look for a smoke trail and make sure the engine isn't screaming too much.
For the idle:
If the idle is staying high and not eventually dropping, try richening the LSN a bit. If the idle is high after a WOT run, and then eventually drops, richen your HSN a little bit. Soemtimes a bit of both can help.
High Speed:
Don't forget your HSN for high speed running with the different fuel. It may be running a bit lean too. Look for a smoke trail and make sure the engine isn't screaming too much.
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RE: High erratic idle after changing fuel??
I have tried all of the above and its still doing it. I will get some o'donnell fuel and see if it changes. Ihave been out of the hobby for several years but the tuning has always been easy for me. I had a tmaxx back when they first produced that model and then i have had 2 ofna buggies since then this is my third after a 3 year break. I guess fuel isnt what it used to be.? I was pretty sure the different fuel would call for a tuning adjustment but the way its acting i think there may be air getting into the system somewhere...?
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RE: High erratic idle after changing fuel??
ORIGINAL: nitroexpress
It doesn't matter what engine you run, Traxxas fuel is not a good idea.
It doesn't matter what engine you run, Traxxas fuel is not a good idea.
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RE: High erratic idle after changing fuel??
Never use fuel color dye in it,If you ask me I consider color dye a contaminant and does lower engine performance.I notice some fuels have more dye in them than others,Still the best fuels are the ones with no dye in them at all like odonnel and sportwerks.
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RE: High erratic idle after changing fuel??
Obviously, you wouldn't useairplane fuel in a on/offroad vehicle.
http://www.byronfuels.com/pages/products.html
http://www.byronfuels.com/pages/products.html
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RE: High erratic idle after changing fuel??
ORIGINAL: nitroexpress
Obviously, you wouldn't use airplane fuel in a on/offroad vehicle.
http://www.byronfuels.com/pages/products.html
Obviously, you wouldn't use airplane fuel in a on/offroad vehicle.
http://www.byronfuels.com/pages/products.html
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RE: High erratic idle after changing fuel??
Thanks for the help guys, I will get some OD fuel this week sometime and see how it goes. I will post the results.
Thanks!
Thanks!