Once you start getting close to what you think is the best throttle response, tune in smaller increments, once you get it so as soon as you touch the throttle the engine start revving up and doesn't bog down at all, so as soon as you hit the gass, the truck takes off, once you get to that point do not lean it any further, and for a safe guard i like to richen it by 1/16 of a turn. One the high speed needle is set to where you want it, you can start with the low speed, start off at the factory setting, and just like the HSN tune in small increments of at least 1/8th of a turn, if not smaller, when tuneing the low speed you are aiming for a nice crisp throttle response, if you run the low speed to lean you will eat through glow plugs very quickly and it can damage your engine. In both cases you need to richen the HSN by at leas 1/8th of a turn if not more. the temperature, since this is your first nitro truck it is a good idea you get a good, reliable temp gauge, the engine should not go over 270 degrees F, if it does it is another sgin of being to lean and you should richen it up just a little bit, but something most people over look is that you should not run under 190 degrees, if you do the piston sleeve doesn't expand enough and the engine will ware out very quickly.Ī last note on the high speed needle is, never tune by one symptom alone, never tune just by performance, or smoke trail or temp, use at least two, so if you lean the engine out and the temps go from 220 to 230, and you notes it's a little more powerful and go a little leaner, the only time you should ever tune by using just one symptom is when:Ī: you run to lean and the engine start hesitating and cutting out the smoke trail, there should always be a nice, clearly visable trail of blue smoke coming from he exhaust, always, if you cannot see a good trail of smoke, it is another sign of being to lean, if you ve a lot of smoke at all rpms then you can go a little leanerģ. the performance, has it gotten better or worse? when you start getting the rpm up does it sound like it's cutting out? if it sounds like it's cutting out then you are to lean and need to richen the HSN, if it isloading up and the performance is very sluggish then it is rich and you can go a little leanerĢ. Then one you have it idling you can start tuning, when your tuning, go in very small increments at a time, and ALWAYS tune the high speed needle first, i usually go by 1/12 or 1/16th of a turn at a time, but must guys go 1/8th of a turn, after each adjustment do a few high speed passes, take very careful note of 3 things.ġ. Now, for the idle being to high or to low, first set it back to factory which is 4 turns out on the high speed needle and 1.75 turns out on the low speed, start the truck and run it around to let it warm up, once you have it warmed up bring it in and let it idle, if it's to high you will need to turn the idle screw out maybe 1/4 or 1/8th of a turn, and see how it's idling then, if you cant get the truck to start, give it a little bit of throttle, once the engine is warm it should start up very easily. Here the guide, i'v just copied this from a file on my computer so sorry if there are some inconsistencies with your problems. The operating temps should be at 270ish, i run my engines at around 245-280 depending on the day. I did buy the plugs that I have based on the search function as well. I did a search as well but there are soooooo many topics on this and it is hard to pick through threads that can actually give you an anser to your own issue. Thanks for any insight that you may give or offer. Heck I wouldn't have bought the truck if I can't run it hard. Am I wrong for running it that hard like that. I mean, I have ran the truck from a dead stop to about 50 yards going and coming back to me. Anything that any of you see I am doing wrong? Wrong plugs? I talked to my LHS today and told them what was going on and they said that I can't run the 3.3 hard for long periods of a time. So far it hasn't blown this new 3232X plug and the engine temps are as low 214 degrees and as high as 221 blasting it. I replaced that plug with a Traxxas 3232X and richened the truck up until it hardly even ran, I then leaned it out until it ran but wouldn't shift into second gear, I then kept leaning it out by like 1/8" turns until it shifted and left it there. Well, that blew a McCoy MC-59 and a Traxxas 3232 with that HS setting. It ran pretty hard like that and had smoke coming from the exhaust even while it was moving a little bit. I took temperature readings by blasting the truck from about 60' and back to me and took readings and temps were as low as 232 degrees and as high as 254. I have been through 5 glow plugs in one week trying to keep the tune safe.
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