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trx .15 pro last chance - 5/8/2008 1:46:08 AM   
boatcapt


 

Posts: 41
Joined: 11/4/2005
From: Summerville, SC, USA
Status: offline
I decided to give my trx a last chance run. I have been trying to get it to run decent on and off for 2 years. It doesn't tune and I get fustrated and let it sit for another few months. I decided to give it another go and sealed the carb and backplate. I usually run the traxxas plugs (part#3232) and decided to use a different brand. I used the o.s. #8.

What a difference. I don't know if it was sealing the engine or the plug, but I was actually able to keep it running. The only thing was I could not get the idle down. It would roll at idle no matter what I did. I had to change my spur gear, so I do not know if I may have something there not set right.

It seemed to run fairly well. Seemed a litlle sluggish on top end. Then my glow plug went bad. 1.5 tanks. The plug was a little wet and still shiney. So I'm thinking I may have been a little rich on the high speed needle?

Any thing you guys could add to help me get this thing running decent would be greatly appreciated. Sorry for the long post.
       Post #: 1

RE: trx .15 pro last chance - 5/8/2008 2:54:03 AM   
UG0TB4NN3D


 

Posts: 1342
Joined: 11/6/2007
From: Jonesborough, TN, USA
Status: offline 		Did you mess any with the idle adjust screw?

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<s>Jammin'''''''' X1 CRT Pro, BCE PJX Chassis + Small Spur mod, Ninja .28 Powered, Spektrum DX 2.0M</s> - <b&

(in reply to boatcapt)
       Post #: 2

RE: trx .15 pro last chance - 5/8/2008 2:55:11 AM   
Stampede Killer



Posts: 1245
Joined: 9/20/2007
From: peoria , AZ, USA
Status: offline 		have you checked the temps?? my engine likes to run best at 290 degrees, and if i lean it out a little bit it stalls at high speed. and mine trys to creep along when it idels, so i just learned to hold the brakes when i stop

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electric guys unlike nitro guys don''t feel the need to compensate for other inadequacies with loud noises and foul smell

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       Post #: 3

RE: trx .15 pro last chance - 5/8/2008 3:20:33 AM   
boatcapt


 

Posts: 41
Joined: 11/4/2005
From: Summerville, SC, USA
Status: offline 		Yes, I adjusted the idle screw and it didn't seem to affect anything. I haven't checked the temps.

(in reply to Stampede Killer)
       Post #: 4

RE: trx .15 pro last chance - 5/8/2008 3:29:35 AM   
UG0TB4NN3D


 

Posts: 1342
Joined: 11/6/2007
From: Jonesborough, TN, USA
Status: offline 		You should screw it in to lower the idle, I believe.

_____________________________

<s>Jammin'''''''' X1 CRT Pro, BCE PJX Chassis + Small Spur mod, Ninja .28 Powered, Spektrum DX 2.0M</s> - <b&

(in reply to boatcapt)
       Post #: 5

RE: trx .15 pro last chance - 5/8/2008 5:01:45 AM   
iamnot


 

Posts: 939
Joined: 9/18/2007
From: noyb, USA
Status: offline 		if you've got the air leaks beat
then you just need to retune the engine

start at factory base settings and tune
hsn - 2 1/2 turns out
lsn - 1 3/4 turns out
idle - 1.5mm opening in carb throat

this may help you
http://www.traxxas.com/products/nitro/trx15pro/blueprints/TRX-15-ENGINE-MANUAL.pdf

this might too
http://www.nitroreview.com/hintstips/ParisRacingEngineTuningTechTips.pdf

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two kinds of people i never believe - fanboys and haters
they never tell the whole truth

(in reply to UG0TB4NN3D)
       Post #: 6

RE: trx .15 pro last chance - 5/9/2008 12:15:31 AM   
boatcapt


 

Posts: 41
Joined: 11/4/2005
From: Summerville, SC, USA
Status: offline 		Ran it again today. It ran really well got the idle down, still not enough to keep it from rolling. But it ran well enough to put the body on it and drive it for a while. So it was sitting there idling and I was putting the body on it and it shut off. It idled for about 45 seconds to a minute. No problem I thought, tried to start it back up, nothing. The glow plug was bad again. Brand new plug lasted about a tank this time. With what I spent in plugs trying to get this thing to run I could have bought a new motor. Its running good now, just eating plugs. I don't know what the temps where, I don't have a temp gun, guess I need to invest it one. Any ideas guys?

(in reply to iamnot)
       Post #: 7

RE: trx .15 pro last chance - 5/9/2008 3:28:16 AM   
DaveG55



Posts: 6350
Joined: 1/12/2005
From: Stockbridge, GA, USA
Status: offline 		You're not tuned right yet. Read that link from Paris Racing, it's the very best there is. Oh, and no properly tuned nitro engine should run for 45 seconds to 1 minute.

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Any technology, sufficiently advanced, will appear as magic

(in reply to boatcapt)
       Post #: 8

RE: trx .15 pro last chance - 5/9/2008 3:40:58 AM   
nitro stan


 

Posts: 356
Joined: 1/7/2007
From: Morrow, GA, USA
Status: offline 		hey Dave where in stockbridge are you? im in morrow over by the mall

(in reply to DaveG55)
       Post #: 9

RE: trx .15 pro last chance - 5/9/2008 3:49:31 AM   
boatcapt


 

Posts: 41
Joined: 11/4/2005
From: Summerville, SC, USA
Status: offline 		Thanks Dave. I thinking maybe I'm still lean. Causing the element in the glow plug to go bad really fast. Maybe running to hot?

(in reply to nitro stan)
       Post #: 10

RE: trx .15 pro last chance - 5/9/2008 12:04:03 PM   
boatcapt


 

Posts: 41
Joined: 11/4/2005
From: Summerville, SC, USA
Status: offline 		It has been in the low 80's here when I have been running. Do you think it would benefit me to run a cooler plug. The o.s. # 8 is a hot plug, the #3 is supposed to be a little cooler.

(in reply to boatcapt)
       Post #: 11

RE: trx .15 pro last chance - 5/11/2008 5:08:42 AM   
divine_13


 

Posts: 1134
Joined: 3/23/2006
From: Edmonton, AB, CANADA
Status: online 		The engine wont idle, mine ran but the word idle did not exist to it.

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One only dies when there is no more good fortune planned for their fate, live your life each and every day. it might end soo

(in reply to boatcapt)
       Post #: 12

RE: trx .15 pro last chance - 5/11/2008 6:01:43 AM   
boatcapt


 

Posts: 41
Joined: 11/4/2005
From: Summerville, SC, USA
Status: offline 		Mine will idle, it just eats plugs. I'm going to order some of the A5's and R5's and see how they last.

(in reply to divine_13)
       Post #: 13

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