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Old 07-17-2010, 09:25 PM   #16
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those will run around 245, and tune for smoke and performance not temp. temp is a guide.
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Old 07-17-2010, 10:28 PM   #17
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When I go back to factory settings, should I use the stock plug or the colder one? And again thanks for all of the help in pointing me in the correct direction.
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Old 07-17-2010, 10:52 PM   #18
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factory setting are rich. did you put a turbo button head on it? if not run OD 99 (medium) plug
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Old 07-17-2010, 11:18 PM   #19
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No its not a turbo. I will let you know what plug I have on it. The colder one, tomorrow.
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Old 07-18-2010, 12:07 AM   #20
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go with a medium plug. it will run alot better.

i went from a medium plug to an hot one today at my race with my engine and man, it ran alot better and the temps were the same and it held the tune all day! never touched the needle all day and not one flame out.
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Old 07-18-2010, 02:46 AM   #21
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I have the same engine as you do my friend. I'm new to the Losi but I'm good at tuning since I'm kinda the "engine guy" and sucks at everything else.
I can tell you that 4 min on a tank is something way wrong.
I'm still in the late stages of break in (half a gallon) and I still run a bit rich but I get 7.5 min with this engine. So if you get 4 min you are messing around bad.
I have also noticed that the 2.5 turn on both needles is not always too rich. I went out to my workshop and measured them for you right now.
I have LSN @ 3.0 turns out from closed
and the HSN @ 3.5 turns out from closed
Those settings give me exactly 7.5 min on a very very tight track with O'Donnell and Byrons GenII 25%
If you HAVE to know about temps I get around 230 to 240 on a hot summer evening with 86 degrees ambient and a lot of humidity.
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Old 07-18-2010, 09:48 AM   #22
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Yes, I agree. 2 1/2 is not always to rich. With the stock plug I think I was around 3 1/2 or so on HSN, and on low I didn't touch it to much. But the plug I went to is an O.S. R5. S I guess I will put it back to factory, and put the stock plug in. As far as temps. outside its been hot as heck in CO. But will give it a try.
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Old 07-18-2010, 10:55 AM   #23
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...and remember, if it is hot outside you have to LEAN it out a little bit to compensate for the hotter air.
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Old 07-18-2010, 12:33 PM   #24
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When I get to go out and try it, I'll just see how it runs. Then I'll check temps. But I didn't know about the leaning it for warmer air. I thought you had to richen for warmer outside temps, and lean it for cooler temps outside.
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Old 07-18-2010, 05:54 PM   #25
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Just got back from trying what you guys said. And from factory it hall a$$. But gets hot as hell quick. I got the temps down to the 250s, but there is so much fuel going through I didn't much of a run. The next one ran it for tune and performance. Then temp, and it was 267, so started to richen it. To bring temps down, and ran like poo.
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Old 07-19-2010, 12:40 PM   #26
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Quote:
Originally Posted by jettaturbogls View Post
....Then temp, and it was 267, so started to richen it. To bring temps down, and ran like poo.

...and there you go again my friend, starting to tune by temp .
If it is stable at 267 let it stay there AS LONG at is has visible smoke and run good.
A too lean engine will bog down and not run good.
A too rich engine will splutter and struggle and not run good.
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Old 07-19-2010, 02:53 PM   #27
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At first I didn't tune it by temp. I tuned it to hall, and it did. But hot. Should I richen it a little bit to save the engine. I have limited funds. I do not want to blow it up. Just want to race, and last a heat.
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Old 07-19-2010, 05:54 PM   #28
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runnning an engine to rich will also shorten the life of the engine also.

what is your definition of hot??
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Old 07-19-2010, 07:49 PM   #29
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I would say that 250 to 267 would be considered hot to me. I have never had an engine get up to this temp so quick. I mean when I get to where I like it, and its warmed up, I temp it. And that consisted of maybe 1 to 2 min of short blips of the throttle to get it to "temp." Before I can do any adjusting to get it to run better. Then I temp it and to me its hot. Or what is a good rule of hot being to hot. I mean there is smoke, almost through the whole power band. I like how quick it is at 260. But that is with the body off. Just worried how much hotter it will get under race conditions, with the body on.
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Old 07-19-2010, 08:21 PM   #30
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are you tuning cold? i run about 3-4 laps before i even attempt to tune on it.
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