hi guys,
i set my t-maxx back to factory tune settings today and went out to tune it properly.
once i made an adjustment, i took it for several high speed runs to continue to re-tune. i whizzed it up the field, it ran real nice, but the engine cut out half way back, i ran over to it and it was overrheating. pouring with smoke.
so i got it home, let it cool down to stone cold.

re-set it back to factory settings thinking that i must have tuned it wrong.(hsn, turn clockwise all the way in then anti-clockwise out 4 turns)

but then even on factory settings it overheats, nothing is blocking the cooling head as i ran it without shell on.

anyone have any ideas why?

i am running 25% optifuel if that is needed.

:thumbs_up:

You may need to richen it slightly, but in my experiance they do tend to run on the hot side.

richen it slightly and see how it goes.

:thumbs_up: :thumbs_up:

richen it? but its already set to factory tune settings. lol. i will have no performance at all :lol:

:thumbs_up:

There is never a standard perfect setting . every car is different, New, Old etc etc. They will give you a setting which will be a base setting, from this you will need to fine tune. Get the truck running, then with the HSP only ritchen it 1/8 of a turn at a time. do this until you notice a reduction in either power or smoothness then turn it back 1/8.

have fun.
:cruising: :cruising:

ok bud. many thanks mate.

hmm yeah i can see im going to have fun with this. :lol:

:thumbs_up:

its the same with all cars.

Where you got your settings from did they say what fuel was being used? i B)

i got the settings off traxxas website mate.

erm, no they didnt say what fuel mate.

sorry

could running 25% be causing it then?
as from factory they are meant to run 20%. that traxxass setup and tuning dvd says that.
:thumbs_up:

Thats my point... depending on the fuel mix you are using depends on how the engine is tuned. So for them to say this is the best setting is Rubbish, because they dont say when using ???? what ever %

see what i am saying :thumbs_up:

yeah i understand you perfectly mate.

thanks for the explaining.

helped very muchly.

:thumbs_up:

if the settings are. All the way in then 4 turns out, for 20%.
how much turns out do you recommend for 25%, to achieve the average starting tune settings?

because if 25% is used, it will need to start off icher than normal.

:thumbs_up:

re-set it back to factory settings mate, then try ritchen your HSP 1/16 of a turn mate each time, your not lose much power.

using 25% fuel will not damage or harm your engine..

ok mate, thanks.

will get it back out later and do it.

Just to add i had my mates t-maxx for over a week tuning it and no matter what i did with his 25% it was well to hot yeah these engines seem to run on the hot side but no joke the fuel was burning in the carb, So firstly tried factory re-set no joy then richened it up helped a little no loner burning in the carb but still cutting out so i decided to try it on my 16% and worked fine so we dumped the 25% and we both run on 16 no just because it was easier and his really doesn't like a high nitro content fuel but does like a high oil percentage. I tried after run every time it started it when it was warm and that seemed better so lower nitro content and more oil seemed to work fine but im not saying thats the case for you i am just adding what i did. :thumbs_up: Good luck.

does anyone know the oil content in the opti fuel?

we started off using the tornado 25% in ours, then changed to tornado 25% fuel with extra added oil, it made quite a difference to the heat..

hmm, if no luck with 25% fuel, i will try the 20%. :thumbs_up:

might b n air leak



adam

? an Air leak causing it to run Hot???

B) B) B) B) B) B) B) B) B) B)

Yes because if there is an air leak it is getting more air to less fule (lean)


So yes it would make it overheat


Adam

Hmmmmm yes Likey that :thumbs_up: ... something else to remember :clap: :clap:

if you have an air leak it will never idle getting worse as the engine gets hotter

Not true I no my savage xl has a air leak and it idles
and it does not get worse when it is at 300



Adam

are you running the k5.9 engine in ur xl cause they are bad engines for air leaks

i run the k 5.9 in my savage x and savage xl after having the engine in my savage x for about 8 months i had one air leak all it did was kill the engine at high speed and that only turned out to be a lose carb theres nothing wrong with the k5.9 its people over tuneing them :thumbs_up:

Richen until your engine until it runs reliably, albeit with less power than before, then lean for an optimal setting. Once you get to the optimal setting, turn back a bit to run a bit rich, ensure a safe mixture and prolong engine life.

While going rich (anticlockwise) I suggest doing 1/4 to 1/2 turns. An engine that runs too rich will, at most, lose power and bog down, so you can get to a safe mixture quicker by making big adjustments

While going lean (clockwise) I suggest doing 1/16 to 1/8 turns. Running too lean can damage your engine fatally, turn this way very slowly to avoid this.

You won't notice any difference immediately after an adjustment, give the engine 30 seconds to let the new setting take effect.

Of course, the intricacies between HSN and LSN are beyond what I can put into words, but this applies to both to the best of my knowledge.

Hope this helps and please correct me if I'm wrong!