New T-Maxx Tuning Question

[N00bBasher]

hey everyone

Hello my name is mark and i am about 2 weeks new to R/C cars in general. I recently purchased a new T-MAXX and to make a long story short i have lost the factory settings for my screws. i know the high speed needle is supposed to be 4 turns out from closed and the low speed screw should be flush with the outer grey line. The part i screwed up with is the idle screw :shrug:

I wanted to know if anyone could tell me a good base to start with as far as the screws are concerned.

The best way for me to understand would be to tell me how many turns out from closed. i dont have a problem doing it the hard (RIGHT) way but i dont seem to be getting anywhere. not to mention i dont even know what i should be hearing or what to look for.

additionally and please correct me if i am wrong but from the factory settings you want to lean out the high speed and low speed screws and not richen them seeing they are really rich from the start.

thanks for any help anyone can provide... :fro:

P.S.S. is there a hotline that i could call and pay so that someone would patiently help me through this?

 

[Kodama]

You can go to www.Traxxas.com and get the Factory settings for all of the screws, but the idle should be about the width of a credit card (the open part). You might want to make it a little bigger.

Adjust your LSN and idle screw till it idles well and will run up to half throttle. (get it to running temp before you finalize any settings) When it idles properly, throttle it half way and see if it stalls or bogs down. If it stalls, it's too lean. If it bogs, it's too rich. Now go to full throttle. This is when you adjust your HSN. Same thing. If it bogs, it's too rich, stalls, it's too lean.
When it seems to be running good pinch the fuel line. It should speed up slightly and then stall within 3 - 4 seconds. If it stops quickly, your LSN is too lean. If it takes longer, the LSN is too rich.
Drive it for a while and then take a temp check to make sure it's at the proper temp.
If it's too hot, richen the HSN.
You will have to make small adjustments on the HSN almost daily to compensate for outside temperature and humidity.

That might help you out a little.

 

[olds97_lss]

Since you are new, you may not know what opening he's talking about for the idle.

You need to take off your air filter and the rubber neck that holds it onto the carb. Turn on your reciever and xmitter and set everything to it's home position, the carb should be closed and your brakes shouldn't be binding. Look down in the carb, you should see a silver barrol. As you screw in the idle set screw, it should open a slot on one side of the carb. That slot should be 1-2mm wide (thickness of a credit card). This would get you to a decent starting point.

As for leaning and richening, your probably right. Most engine manuals and carb settings that are in them are the settings for break-in. However, keep in mind all engines are different. What's rich for one may be dead on or lean for another. Another thing to remember is that a little adjustment goes a long way. 1/16th of a turn at a time, then run it a little to see what the change did. If it improves, do another 1/16th and keep doing this process until your happy (or at least running).

Crap... I didn't read kodama's quote, I thought he was quoting your questions... Oh well.

 

[Rolex]

Thanks, Kodama, I was about to hunt down that link.

 

[TT120]

One important thing on the 2.5 engine is to make VERY SMALL adjustments as quoted above. No more than 1/16th turn at a time then make a few laps to let it "settle in".