Your favorite way to tune HSN?  
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Your favorite way to tune HSN? - 4/5/2007 9:02:27 PM   
Arboleda


 

Posts: 21
Joined: 2/6/2006
From: Riverton, UT, USA
Status: offline 		At this point I've read three differing methodologies for tuning the HSN. Which do you believe to be "better" (for me better is a good tradeoff between performance and longevity of the engine):

1 - Tune purely based on temperature. Basically if the temp is not around 220 - 250, either lean it to get it higher or richen it to get it lower.

2 - Ignore temperature. Move up the HSN an hour at a time and test each time by running it for a minute or two including all-out acceleration to open throttle. Find when the car begins to lean bog on acceleration or top speed, then move back 2 hours richer and you're done.

3 - Ignore temperature. Start with something clearly on the rich side and slowly run it more lean until the car simply doesn't accelerate and hit top speed any better. This implies you can keep getting more lean with little to no performance improvements. This is probably the hardest of the three as well because I have a hard time seeing small improvements.

On LSN I'm using the pinch trick at this point. Depending on what the engine does when pinching the fuel line near the carb, adjust more rich or lean. This seems to be a pretty universal recommendation, anyone disaggree?
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RE: Your favorite way to tune HSN? - 4/5/2007 9:06:00 PM   
SManMTB



Posts: 4792
Joined: 4/28/2005
From: Charlottesville, VA, USA
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RE: Your favorite way to tune HSN? - 4/5/2007 9:55:24 PM   
benzzyo5



Posts: 2865
Joined: 1/29/2006
From: carmel, NY, USA
Status: offline 		yeah iagreee ......3

1 is just dagerous for the enigne and stupid....lean it to get the temps up? thats the worst, in some cases you can lean it a full turn to much and the temps will only be at 200. don't tune by temp thats the worrst thing

< Message edited by benzzyo5 -- 4/5/2007 9:56:35 PM >

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RE: Your favorite way to tune HSN? - 4/5/2007 10:02:11 PM   
what_stanger


 

Posts: 289
Joined: 12/20/2004
From: Belvidere, IL, USA
Status: offline 		yeah, Imagine a 40 degree day, with a 30mph wind. All that wind cooling your engine, plus your cars speed. Not to mention the already low ambient temp.

I like most, use temp just to make sure its not unusually hot.

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RE: Your favorite way to tune HSN? - 4/5/2007 10:49:46 PM   
nik77356


 

Posts: 519
Joined: 12/18/2006
From: Montgomery, TX, USA
Status: offline 		a mix of 2 and 3 i just start with what its already set at and go from there

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RE: Your favorite way to tune HSN? - 4/5/2007 11:33:57 PM   
hpi apollo



Posts: 2639
Joined: 5/13/2006
From: Georgetown, KY, USA
Status: offline 		hpi apollo to the rescuse, im assuming you have read this? I've had this critiqued by many experienced guys and even Brian Cooper of Cooper Fuels LLC (aka. Fuelman) he said it was great, so just go by it

edit: woops, forgot to add the link http://www.rcuniverse.com/forum/m_5517128/tm.htm

< Message edited by hpi apollo -- 4/5/2007 11:35:56 PM >


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RE: Your favorite way to tune HSN? - 4/6/2007 2:15:30 AM   
HeLLsGoD



Posts: 719
Joined: 2/10/2007
From: hellJP, ANTARCTICA
Status: offline
quote:

3 - Ignore temperature. Start with something clearly on the rich side and slowly run it more lean until the car simply doesn't accelerate and hit top speed any better. This implies you can keep getting more lean with little to no performance improvements. This is probably the hardest of the three as well because I have a hard time seeing small improvements.


You have a hard time seeing the improvements cause the settings dont take effect instantly, the crank needs to be cleared out by high throttling. Try leaning out your engine 1/4 for tiny abit so at least you can tell and feel the difference

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