Tuning
 

Why is it that for these little motors such as a trx 2.5r, you always have to tune after every run? In normal motors you dont have to touch them at all?

If you use a quality fuel & if nothing is wrong with your motor you should'nt have to retune after every run.

Thanks, buy you HAVE to tune if the weather temps change right?

Only a little usually you only mess with the end needel.

Ok, thanks.

bigger the engine, the easier to tune, smaller, the harder. Thats why teh nitro m18 is abadd idea! no1 will wanna tune it.

Thanks for the info guys.

got temp gauge right?

I thought the tune ablity was more on the motor design not the size. I have heard that the thunder tiger with th .70 in it is hard to tune as well.

well, on average, the big block motors are easier. I was messing with my freind's savage, adn his engine was SOOO easy to tune... compared to my 2.5

i dont know what ya'll are doing but a acncm head makes it the easiest thing in the world to tune. not to mention you can lean it way out and it will still only run 230. it helps the runtimes to. i get about 45 secongs to a mintue more time per tank than most. alot when your racing.

-corey

How much is that acncm head cost?

i paid 40 shipped on ebay. they gurrentee a 50 degree drop.

-corey

Why is that, is it just because it is bigger in size? Or different material used, or somthing else?

heres some pictures. IT IS HUGE! you will have you trim your body a good bit.

-corey

Whoa, that is huge! Now i understand why it dissapates some of the heat:p

I've got that head on my T-Maxx also. I did some before and after temp readings on it and it did make a difference. (although it was too long ago and I don't remember the #s).
I also have never had any tuning issues with my 2.5 in the gallon and a half of 33% that I have run through it since I've had it.

Thats good to know, because i will by sometime have a nitro, thanks for all the help.

also, if you want it to run cool and long. DONT USE TRAXXAS TOP FUEL! it gums up the engine case and doesnt burn clean. i run trinity 30% and it looks as good as it does then i rebuilt it. guess why i had to rebuild it....

Thats odd, why would traxxas fuel be bad for traxxas motors? That is very stupid, Why did you rebuild it? Lemme geuss the traxxas fuel messed it up?:p

That's all that's ever been run in mine. Never had any issues. Temps are fine too. Maybe I don't run it hard enough.;)

if ur exhaust is black! then STOP DRIVING! All the other stuff is unimportatn lol

well the traxxas fuel doesnt burn to clean. it gummed my engine up which in turn trapped moisture and it got a little rusted on the sleeve. which made it loose compression. i only ran a gallon of it through there. when it started to act up. then at about a gallon ahd a half i had to rebuild it. when i pulled the head off the piston looked almost dirty (not really dirty but like it wasnt burning clean). now after a gallon of 30% trinity it looks like its brand new.

-corey

I geuss ill have to try that trinity 30% nitro, i wanna get it right the first time not having problems all the time, thanks, squee.

There is absolutly nothing wrong with traxxas fuel. Roy from rd racing products & (countless others) uses 33% and he won the NW divison of the RC PROSERIES, & finished 4th at the finals in sun valley. If your still having to tune your motor alot from tank to tank, you might have a air leak around the carb, or back plate, or around your needles. There is a product called AIR SEAL made by racer's choice, it's a liquid that you put on the places i mentioned it helps seal up the motor. This helps the motor hold a better tune. How many galloins do you have on this motor ?.. Maybe you need to have the sleeve pinched. Also temp guns are only a referance point the traxxas rep told me to tune for performance not temps. You want a nice trail of blue smoke, if it rundds good & you have blue smoke he said thas good.

Thanks for the info , ill ask the guy at my lhs what would be best to run.

If you go on the sgrid.com you can talk to all the PRO drivers. Steve slayden. Roy from rd racing, DAlE MOWERY from dace mfg & plenty others PRO drivers They will give you the best info.

The LHS is going to tell you the best fuel to run is the fuel they sell. So go the sgrid like i suggested there is a thread on this topic. You will get all your ? answerd ther from the fastet people is the business.

Alright ill try that place, thanks:)

No problem They have induvidual threads for each viechile. Traxxas , kyyosho, mugen & so on.

CaN SOMEONE PLEASE POST A LINK TO THE SGRID I DONT KNOW HOW THANK'S.

I was always told if you start with a kind of fuel stick with that type. Not sure what the difference is. Just thought I would add that.

coolhand, that is very true. dont which fuels unless it is a fresh piston and sleeve.

-corey

Fuel is mainly preference. There is no such thign as a "BETTER" fuel. (unless its a crap generic one). Depends upon the user's opinion.

not so true ncazb. some fuels have more pur nitormethane and burn cleaner and some use synthetic additives as well as more or less castor oil. i would disagree and say there are better and worse fuels.

I think thats a old myth. I know some of the fastest guys in FL that switch fuels with no problem at all. If you are using a quality fuel to begin with i dont think it's a big deal. The real issue is switching % of nitro, say from 20% to 30%. I think thats more important. My buddy won the fl state series last year with with a tmaxx with a 2.5. He used at least 3 different fuels, dynimite, maxy's, & trinity. He got 10 gallons of fuel the the motor before he had to replace it. The moral of this thread is use a QUALITY FUEL.:D

I agree with the quality of fuel. I also agree with the %. I think it is important towhat you do to your motor as well when you run it.

A lot of people run there motors to lean, which hurts the motor. They also dont keep there air filter clean & oiled. That probably does as much or more damage to the motor than anything else.

my frained said he got 10 gallons outta his engine. Dunno how, but he said as long as u take care of it really well. Plus he had a special "BREAK IN METHOD" that he perfected. break in is very important

....??????i have a t-15 motor.....and im curious ......do you have to tune this one????:032:

You have to tune EVERY r/c motor, regardless of its size.