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Model Forum / Radio Controlled / Land Models / February 2004T-maxx tuning trouble
I have a T-Maxx 2.5 and I'm having some trouble tuning the engine. The engine was broken in per the manual, then leaned out for performance. The top end is great, but acceleration is hit and miss. If the truck has been idleing for a few seconds, acceleration is instant. However, if the truck is moving and I hit the throttle, it bogs a little, then picks up. I've tried tuning using the 3-second rule in the manual, and I've also tried making the adjustment screw flush with the carb body, but no help. Please post if you have any suggestions. Brian > I have a T-Maxx 2.5 and I'm having some trouble tuning the engine. The > engine was broken in per the manual, then leaned out for performance. [quoted text clipped - 4 lines] > I've also tried making the adjustment screw flush with the carb body, > but no help. Please post if you have any suggestions. Sounds to me like the low speed needle is a bit rich (try running it in 1/16 turn clockwise and testing) or that the glowplug is too cool or failing. You can call the boys at 888-TRAXXAS and they'll listen to it run on the phone for a more accurated diagnosis.  SignatureL.V.X., brother mouse http://www.mousetrap.net/otr/ Old Time Radio trades http://makeashorterlink.com/?K16312E06 CBS Radio Mystery Theater database http://greyhound.mousetrap.net/altus/ retired racing dog If it accelerates from idle but not from mid range, then I don't believe it is the LSN. I think the GLO plug suggestion is a good one - definitely try a couple of warmer plugs, and maybe a variety of different brand plugs as well. Also I would check for possible leakage in the fuel system, although I doubt that is the problem. Is it possible that you've leaned it off a little too much on the HSN? Lastly, I would try another batch of fuel as well. Depending what fuel you have now, it might be worth upping the nitro percentage. But anything like this, I would start by looking at the plug before I do any tuning. Mike > > I have a T-Maxx 2.5 and I'm having some trouble tuning the engine. The > > engine was broken in per the manual, then leaned out for performance. [quoted text clipped - 11 lines] > You can call the boys at 888-TRAXXAS and they'll listen to it run on > the phone for a more accurated diagnosis. > If it accelerates from idle but not from mid range, then I don't believe it > is the LSN. Agreed. I had a more complex/long answer in mind but got lazy. Thanks for the additional info. SignatureL.V.X., brother mouse http://www.mousetrap.net/otr/ Old Time Radio trades http://makeashorterlink.com/?K16312E06 CBS Radio Mystery Theater database http://greyhound.mousetrap.net/altus/ retired racing dog Thanks for all the great suggestions. The truck was just broken in, so the plug may be part of the cause. I'll try that, along with richening up the HSN. It is running a bit on the hot side, but I've heard this engine does that. I'm running Blue Thunder 20%, FWIW. Brian > > If it accelerates from idle but not from mid range, then I don't believe it > > is the LSN. > > Agreed. I had a more complex/long answer in mind but got lazy. > Thanks for the additional info. > Thanks for all the great suggestions. The truck was just broken in, so > the plug may be part of the cause. I'll try that, along with richening > up the HSN. It is running a bit on the hot side, but I've heard this > engine does that. The 2.5 will run something like 160-170F above ambient. Rough guide, not gospel. THis is a bit cooler thant hte Pro .15. If it hits 270-280F it will stall out. > I'm running Blue Thunder 20%, FWIW. That fuel should work fine in the 2.5. SignatureL.V.X., brother mouse http://www.mousetrap.net/otr/ Old Time Radio trades http://makeashorterlink.com/?K16312E06 CBS Radio Mystery Theater database http://greyhound.mousetrap.net/altus/ retired racing dog I've had the truck out a few times since this post and tried a few things, but no luck yet. I bought a Thunderbolt glow plug and went through the extremes with both needles, but was not able to solve the problem still. I have also learned that it isn't just throttle response that's a problem. The truck also does not run right at part throttle. I now suspect an air leak somewhere, but can't be certain. I'll continue to try things and keep folks posted. Brian > > I have a T-Maxx 2.5 and I'm having some trouble tuning the engine. The > > engine was broken in per the manual, then leaned out for performance. [quoted text clipped - 11 lines] > You can call the boys at 888-TRAXXAS and they'll listen to it run on > the phone for a more accurated diagnosis. > I've had the truck out a few times since this post and tried a few > things, but no luck yet. I bought a Thunderbolt glow plug and went > through the extremes with both needles, but was not able to solve the > problem still. I have also learned that it isn't just throttle response > that's a problem. The truck also does not run right at part throttle. I don't recognized Thunderbolt from the tested-by-Traxxas list. These plugs are known to work: Traxxas 3232, 3231, 3230 (when/if you can get them) Dynamite/McCoy MC8, MC9, MC59 K&B 1L > I now suspect an air leak somewhere, but can't be certain. I'll > continue to try things and keep folks posted. Have you called 888-TRAXXAS yet? SignatureL.V.X., brother mouse http://www.mousetrap.net/otr/ Old Time Radio trades http://makeashorterlink.com/?K16312E06 CBS Radio Mystery Theater database http://greyhound.mousetrap.net/altus/ retired racing dog please let me know if that works. I have an RC10GT truck with an OS CV-15, and it is doing exactly the same thing that you described Richen the high side needle. You are starving the engine of fuel. It loads up a little when at idle so excell is good. But if it hesitates during excelleration after running above idle its starved. Even if this is wrong the worst you will do is run a little rich. Bob T. > please let me know if that works. I have an RC10GT truck with an OS CV-15, and > it is doing exactly the same thing that you described |
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