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Old 03-06-2005, 09:42 AM   #1
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What do you do?

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What do you do when its humid

Richen or lean??
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Old 03-06-2005, 10:42 AM   #2
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Richen it. The engine will be hotter because of the humidity. In the winter time you can lean it out more since the weather keeps the engine cooler.

Adjust and keep an eye out on the engines temp. The spit trick works well if you don't have a temp gauge/gun.
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Old 03-06-2005, 11:09 AM   #3
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Good call fromthe temp aspect but...
hotter humid air is less dense (Assuming heat with humidity) therefore the less dense air will need less fuel so it is appropriate to lean it out some.

Either way the best indicator of how rich it should be is by the temperature of the engine.
adjust your needle to have the engine run at the usual safe temperature.
this depends on the vehicle.
my Losi NXT usually around 220 f but my T maxx is always a lot hotter.

Conflicting advice.
good luck
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Old 03-06-2005, 12:23 PM   #4
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yea i was suprised to learn that in colder temps you have to richen it because of the dence air.

but as just stated... take temps to be sure
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Old 03-06-2005, 12:33 PM   #5
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Tip, Engine Starting Summer/Winter and Temperature Reading Locations

If you had your engine tuned in the summer, chances are you will not be able to start it as easy in the winter months. assuming your engine compression is good but your engine still didn't want to start and its (-) whatever temperature it is with a very low humidity of say 30% or lower, you will then have to turn you HSNV 1/2 turn richer to get the engine to at least start. Once the engine has started, get it to operating temperature and tune from there.

Having said that, during the summer when the RH is so high, richen your HSNV to get your truck to start and tune from there as well.

As always try not to lean your engine out too much unless you are willing to accept the responsibility that you will end up buying a new engine sooner than later.

I highly recommend that you do not do the spit test simply because you should be spitting on the fin closest to the glow plug since it is where heat dissipation starts and the last or top fin is the farthest from the glow plug that the temperature up there is much more cooler than the bottom fin.

Hence, when you use the laser temp gun you take a reading of the glow plug area and not the top fin. Same as if you were to use a MIP or Venom Temp Guage that you wrap the sensor around the bottom fin.
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Old 03-06-2005, 02:14 PM   #6
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Engine temps are okay, but the best bet is to tune it. learn to tune the top end first, then the bottom end. tune for high speed, then richen a little. tune the bottom to match. small adjustments due to track conditions.

Temps are a good basis but shouldn't be the end all to tuning. You should be able to tell by the way it runs and sound.

then there's turbo plug engines. a whole new game of fun
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