Malorie
Elite Veteran
Location: Paw squared, MI
| It has been my experience that most of the nitro machines that run muffler pressure tend to get leaner towards the end of the tank. This is partly because the fuel level varies so greatly from the top of the tank to the bottom and even more of it is due to recycling oil into the mix from the muffler. As the tank empties, the oil to fuel ratio becomes richer and there is less burnable fuel in your fuel, hence the leaning out condition.
With the TJ Pro, this can be a pain as when you are running rich at the top of the tank, your throttle/pitch mix doesn't allow the TJ to engage (this was one of my deciding factors in choosing the GV-1 over the TJ Pro). One solution is to set up your throttle curve so that your headspeed when running on the curves is higher than you have set up in the TJ. That way when you are rich at the beginning of the tank, it will still engage. With a GV-1, it will engage much earlier and this isn't a problem.
The other issue can be fuel foaming. The less fuel there is in the tank, the more foam you will ingest and there is less fuel getting to the carb as a result.
A pumped motor will still suffer a bit from recycling the oil unless you leave the muffler pressure out of the mix (punn intended). 
My personal solution was to run a bladder tank, which cured all my clunk woes as well. This keeps me from recycling my oil and getting inconsistant fuel/oil mix throughout the tank. I still run a bit leaner towards the bottom of the tank, but it is far less noticable. That along with the GV-1 has me running fine from the beginning of the tank to the end.
Malorie
Life's a journey, NOT a destination. |
