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steveono

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Ok guys done everything like you guys said with my t maxx. 4 turns out on high side and level with inner ring on low side and set idle the width of a credit card. I also got a temp gauge as well. When I made 3 passes with it the temp was 292, so I richened it up. Next cpl runs it was 240-250. Good right? Evidently not it wouldnt even shift into 2nd. And it fouled another plug. So I adjusted my low side to where it would cut off after 3 secs. After making a few more runs it fouled another plug.Temp is still 240-250, and the engine still wont rev up much(still wont even shift) After playing with it a lil longer it seemed to run a lil better but again it fouled my last plug. Why is it doing this? The temp is right, it shuts off after 3-4 secs????
 
Are you getting any hesitation? Does it take off good from a dead stop to half throttle?
What's the outside temp now? Start it and just let it idle. Keep checking the engine temp till it doesn't rise any more. What's the idle temp at?
 
If it is blowing a lot of blue smoke and not getting full top end RPM, then you are too rich on the HSN. Turn the HSN in 1/8 turn and do several passes. After about three passes, if you are getting better top RPM and it shifts, check the temp. If you are 270 or lower, you are ok, as long as you still have some blue smoke. Also, check your idle.
 
If the idle is too high, it won't shift from forward to reverse. It won't have any effect on shifting into second. Proper tuning determines that, unless an adjustment is needed in the transmission.
 
It was about 55 outside. I thought it was too rich too but when lean it out 1/16 it starts running about 275-285. Theres no hesitation on takeoff but it still wont wheelie off the line like everyone says. Idle temp is about 220-230. It does good up till half throttle then it doesn't matter how much further you pull the trigger it stays the same.Also idle is crazy. It will die every time you start it but if you raise the throttle at all, it will start trying to move when you stop it. I was wondering is the revo any easier to tune than the maxx. I'm actually thinkin about sellin and buying something else maybe even an e maxx. Help
 
I kinda hafta step in here with a little advice that might go a little against what you've already heard. That is...tune for performance, let the temp just be a guide. First off, conventional wisdom states that Traxxas engines just run hot. It was that way with my TRX .15 Pro when I got my Maxx. And it seems the 2.5 runs hot, too. I guess that's just the way it is. Prevailing sentiment seems to state that temps around 300 are not uncommon for this engine. So I'd slowly lean the HSN out until you're getting good revs and are able to shift into 2nd. Run it for a few passes making sure there's still a trail of smoke and the engine is getting up on pipe and forcing the shift. Then take the temp and let that be your guide as to where your temp should hover.
 
steveono said:
It does good up till half throttle then it doesn't matter how much further you pull the trigger it stays the same.
Click to expand...

Did you check to make sure your carb is opening all the way?
 
Richen the LSN slightly. 230 is a little hot for that outside temp. You might also have to adjust the idle to bring the RPMs up, since a richer LSN slows the idle. Keep the idle temp at about 200 since since it's only around 50. DO NOT be looking for wheelies with a brand new engine. Since it's been running at 200, the break in isn't over yet.
Once the idle is good, and it takes off without hesitation or stalling, make any other adjustments with the HSN. A little at a time, then make a few WOT passes and keep checking the temps. Make sure you always see a trail of smoke.
 
Yes I did. Actually if you have a long enough run way you can get the rpms up(like 200yards) But they go up and down. My friend wants to buy it right now. Is there any other nitros that are any easier to tune???? (Hpi, Revo???)
 
Candyman said:
Did you check to make sure your carb is opening all the way?
Click to expand...
Good point. Take off the air filter and with the engine off, throttle it all the way and see if it opens fully. You might have the trim knob on the radio set wrong, or it could be a linkage adjustment.
 
I did try richen it a lil. But when I do it just keeps fouling plugs. I've went through 7 so far. How long do the plugs usually last?

where is the trim knob suppost to be set at?
 
Tough call on plugs. Sometimes half a tank, sometimes half a gallon.
Don't give up on it yet. Seriously, it has not been broken in yet because of the 200 degrees it was running at. You're now looking for performance running, and that's not going to happen yet.
At the temps it's running now, go back to the break in procedure, and slowly start to adjust for each tank.
Even after break in, most engines really don't come to life till they've had about a gallon run through them.
 
Again, proper break in is all about the temps. Run it with the body on.
It's not a cooling head problem, it just hasn't had a chance to properly heat cycle yet.
Find BDC (bottom dead center) for the piston, then put a mark on top of the flywheel with the piston at the bottom. After each tank, bring the piston to BDC and allow the engine to cool down completely before running the next tank.
 

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