|11-01-2011, 04:03 PM||#1|
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I am: steve m
Join Date: Feb 2010
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What traxxas 3.3 setting do you use?
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I Just curious what settings work for different people in diferent areas on the TRAXXAS 3.3 trx nitro engine, I know how to tune, but was just curious what others have their engines set to in different types of vehicles?? Please tell us where you are , what you have it in, and the LSN and HSN settings you use for maximum performance?? I want to put together a graph to help others that can't seen to tune theirs.
|11-07-2011, 11:36 AM||#3|
I am: Brody B
Join Date: Mar 2008
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Re: What traxxas 3.3 setting do you use?
There is no such thing as a "universal" needle setting for optimum performance. There are WAY too many variables that have to be taken into account...ambient temp., humidity, elevation, type of fuel (brand, nitro %, oil %), airfilter, exhaust, and on and on.
This would be of more help IMHO:
"Peformance Tuning Guide
There are many ways to tune a nitro engine but I figure this is the most simple way to do it. This technique is for a fully broken in engine that is ready for a full performance tune. This tuning procedure will set your needles to where they need to be for optimum performance, the engine will tell you all you need to know.
For this method to work the engine has to be at running temperature (or as close to it as possible) as well as having the standard 1mm gap for the carburetor opening.
High Speed Needle
Pull a full throttle pass a couple of times and listen to what the engine does when you let off the throttle. If the it drops right to idle, the HSN is either good or on the rich side. At this point you can lean the HSN in 1/12 turn increments until the idle seems to hang a little after a full throttle pass. If it starts to idle high after a pass it is just on the lean side of a perfect tune. Back the HSN out 1/12 turn at a time after a wot pass until the engine drops right to idle after a pass. Now your HSN is set.
An explanation to what is happening is simple - if your HSN is too lean, after a full throttle pass when you let off the throttle the engine is still lean causing the idle to hang and idle high until the LSN has a chance to take over and meter the right amount of fuel to bring the idle down to normal running speed (given the LSN is set correctly).
If the opposite happens, after a full throttle pass when you let off the throttle it drops to a good idle right away and then starts to idle back up too high, this is a sign that the LSN is too lean. If it comes off full throttle with a good tune and will drop RPM nicely then the HSN is metering the fuel properly but once it hits idle the LSN being too lean will quickly take over causing the RPM to go back up.
Low Speed Needle
Most of this setting was explained above but there are a few little tricks you can use to make sure the LSN is adjusted perfectly. We all know that you don't tune for temperatures, but a temperature gun is very handy for this part. After some full throttle passes with the engine good and warm, bring it in and let it sit for about 10 seconds. At this point take your temperature gauge and hold it as steady as possible on the head, what you want to see is the temp dropping a degree every 4-5 seconds. You want the temp to drop very slightly at idle because when your off throttle the engine should be cooling, if not, the temps will keep pushing higher during on and off throttle running and will cause temperature issues.
This is how I do it and I have tuned a lot of engines for people, whether bashing or racing. I have seen across the board from beginners to veterans that when they hear the high idle after a pull, the first thing they go for is the LSN when in fact it is the HSN causing the issue. If you have any questions feel to contact me at firstname.lastname@example.org . "
This is from the ERCM website and the way I tune my engines.
|11-09-2011, 05:59 PM||#4|
I am: John R
Join Date: May 2011
Location: London, Ont
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Re: What traxxas 3.3 setting do you use?
Hey Madness, I think I know what you are talking about.
When I got my Tmaxx 3.3 I left it set to "factory settings" (4 turn HSN and 1 turn or flush on the LSN) for break in but had a heck of a time keeping it running.
I tried the pinch test and it stalled immediately, meaning factory was to lean.
Also I had loss of power and stalling ( like running out of fuel)at mid to high rpm meaning too lean also!!
I did some homework on the 3.3 to figure this out...and found that the carb on the 3.3 is the same as the 2.5, meaning that the engine is under carbed.
Since the 3.3 is about 20-25% larger, I upped my needle setting to compensate,
I live in Belle Ewart, Ont and ran it this past weekend at 2.5 turns LSN and 5.5 turns HSN....That ran it at 240 at the plug.
As ajb1205 said, every engine is different though, but this may help someone in this area with a base setting for this time of year, remember, RICH never hurts anything, but lean will kill your engine...
Raptor 30 V2, Proboat Impulse 31, Venom creeper, Traxxas Tmaxx 3.3, Gennisis Cat, H9 P51 mustang, Blade MSr,Traxxas Funnycar, 29% Christen Eagle.
You can't have everything, where would you put it??
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