R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 06-02-2010, 05:59 PM   #46
Tech Elite
 
jmaxey51's Avatar
 
Join Date: Dec 2009
Location: Athens, GA
Posts: 3,917
Trader Rating: 7 (100%+)
Default

Quote:
Originally Posted by deadmancourt View Post
that does make sense! is there a way to seal the rubber boot on the lever side?...it is starting to show a tiny bit of fuel!...the boot to carb side is sealed!
nope makes me mad, but you just have to buy a new rubber boot. they arent much. also when you change it make sure your carb slid is smooth and has no play in it.
jmaxey51 is offline   Reply With Quote
Old 06-03-2010, 01:20 PM   #47
Tech Addict
 
Join Date: Feb 2009
Posts: 609
Trader Rating: 1 (100%+)
Default

UM , the boot is only for dust protection . If fuel is leaking it is either the carb. slide or carb housing . I had one that was leaking , i took slide out , cleaned it real good & it stopped leaking for a while but it has started back so i am replacing the slide .
romax is offline   Reply With Quote
Old 06-07-2010, 03:49 PM   #48
Tech Regular
 
jeff_ellis_9's Avatar
 
Join Date: May 2010
Location: Grover, NC
Posts: 418
Trader Rating: 5 (100%+)
Default

*update*

Well I finally got my servo and put it in. I set the motor back to factory settings and went from there. After alot of tuning I got it going pretty good. Stays idling, puts out blue smoke, rather fast, and temps around 250*.

PROBLEM:

Every time I hit a jump I made in my back yard the buggy revvs high once in mid air, causing out of control landing. I have to hit the brakes to stop the revving. I know its not me b/c im letting off the throttle after I leave the jump, this thing is doing it on its own! It makes the buggy "nose-up" in mid air, almost completely vertical. What do I have set wrong? Or what can I test to see if everything is right? Weather its my electronics or what. As far as my servo, it appears to be working properly when sitting down. Now you may automatically assume that my idle is too high, well the buggy idles fine to me when I bring it to me and put it on the starter box (wheels off the ground)
__________________
Team Losi Buggy
GO Tech 5 port RB Mods
AKA
HiTec
Spektrum DX3S
jeff_ellis_9 is offline   Reply With Quote
Old 06-07-2010, 03:53 PM   #49
Tech Regular
 
Slider30250's Avatar
 
Join Date: Feb 2010
Location: Eastern North Carolina
Posts: 428
Default

Quote:
Originally Posted by jeff_ellis_9 View Post
*update*

Well I finally got my servo and put it in. I set the motor back to factory settings and went from there. After alot of tuning I got it going pretty good. Stays idling, puts out blue smoke, rather fast, and temps around 250*.

PROBLEM:

Every time I hit a jump I made in my back yard the buggy revvs high once in mid air, causing out of control landing. I have to hit the brakes to stop the revving. I know its not me b/c im letting off the throttle after I leave the jump, this thing is doing it on its own! It makes the buggy "nose-up" in mid air, almost completely vertical. What do I have set wrong? Or what can I test to see if everything is right? Weather its my electronics or what. As far as my servo, it appears to be working properly when sitting down. Now you may automatically assume that my idle is too high, well the buggy idles fine to me when I bring it to me and put it on the starter box (wheels off the ground)
Your idle mixture is too rich and your idle gap is too wide. When your buggy is sitting on the box does the idle hang at a mid or high RPM for a second or too before settling down.
__________________
Anyone can crash, I crash with style

Mugen MBX6R/Airtronics M11X/Ninja Engines/Sidewinder Fuel/EB Mods
Slider30250 is offline   Reply With Quote
Old 06-07-2010, 04:03 PM   #50
Tech Regular
 
jeff_ellis_9's Avatar
 
Join Date: May 2010
Location: Grover, NC
Posts: 418
Trader Rating: 5 (100%+)
Default

yes it does.

Is that two different things you are talking about? idle mixture and idle gap? Or is that both the idle screw?
__________________
Team Losi Buggy
GO Tech 5 port RB Mods
AKA
HiTec
Spektrum DX3S
jeff_ellis_9 is offline   Reply With Quote
Old 06-07-2010, 04:13 PM   #51
Tech Fanatic
 
Cory Kerber's Avatar
 
Join Date: May 2009
Location: Fresno, CA
Posts: 769
Trader Rating: 10 (100%+)
Default

Quote:
Originally Posted by jeff_ellis_9 View Post
yes it does.

Is that two different things you are talking about? idle mixture and idle gap? Or is that both the idle screw?
Idle mixture would be LSN, Idle gap would be idle screw.
__________________
Losi 8ight-Novarossi N21R-Hitec Servos-AKA-M11 Spektrum
*TEAM TERRIBLES*
Cory Kerber is offline   Reply With Quote
Old 06-07-2010, 04:21 PM   #52
Tech Regular
 
Slider30250's Avatar
 
Join Date: Feb 2010
Location: Eastern North Carolina
Posts: 428
Default

Quote:
Originally Posted by jeff_ellis_9 View Post
yes it does.

Is that two different things you are talking about? idle mixture and idle gap? Or is that both the idle screw?
Yes, the idle gap is just your idle speed adjustment, also referred as "idle gap".

Start by leaning out your idle 1 hour, rev the engine to clear it, your idle speed should hang for a little longer than before, lean your idle another hour and repeat reving the engine. you will get to a point where your idle speed wont come back down. At that point lower your idle speed back down to where you want it. Start back with leaning the idle mixture and reving the engine to clear it. If you go more than 4 hours lean on idle then richen your high speed needle 1 to 2 hours. Soon you will get to a point where you cannot lower your idle speed with the idle speed screw, you will finally be lean on the idle at this point. Richen up the idle mixture just enough to allow you to set the idle speed with the idle speed screw and you can go and tune your high speed from there. The only other thing to watch for when you begin tuning the high speed is a lean bog when you take off. If you cannot tune the bog out with the high speed needle and still have good perfomance then richen your idle 1 hour and reset your idle speed then continue tuning the high speed needle.
__________________
Anyone can crash, I crash with style

Mugen MBX6R/Airtronics M11X/Ninja Engines/Sidewinder Fuel/EB Mods
Slider30250 is offline   Reply With Quote
Old 06-07-2010, 04:22 PM   #53
Tech Regular
 
jeff_ellis_9's Avatar
 
Join Date: May 2010
Location: Grover, NC
Posts: 418
Trader Rating: 5 (100%+)
Default

got ya. I will try that and get back.

also, which should I adjust first? and how will I know when both are correct?
__________________
Team Losi Buggy
GO Tech 5 port RB Mods
AKA
HiTec
Spektrum DX3S
jeff_ellis_9 is offline   Reply With Quote
Old 06-07-2010, 04:31 PM   #54
Tech Regular
 
jeff_ellis_9's Avatar
 
Join Date: May 2010
Location: Grover, NC
Posts: 418
Trader Rating: 5 (100%+)
Default

Quote:
Originally Posted by Slider30250 View Post
Yes, the idle gap is just your idle speed adjustment, also referred as "idle gap".

Start by leaning out your idle 1 hour, rev the engine to clear it, your idle speed should hang for a little longer than before, lean your idle another hour and repeat reving the engine. you will get to a point where your idle speed wont come back down. At that point lower your idle speed back down to where you want it. Start back with leaning the idle mixture and reving the engine to clear it. If you go more than 4 hours lean on idle then richen your high speed needle 1 to 2 hours. Soon you will get to a point where you cannot lower your idle speed with the idle speed screw, you will finally be lean on the idle at this point. Richen up the idle mixture just enough to allow you to set the idle speed with the idle speed screw and you can go and tune your high speed from there. The only other thing to watch for when you begin tuning the high speed is a lean bog when you take off. If you cannot tune the bog out with the high speed needle and still have good perfomance then richen your idle 1 hour and reset your idle speed then continue tuning the high speed needle.
__________________
Team Losi Buggy
GO Tech 5 port RB Mods
AKA
HiTec
Spektrum DX3S
jeff_ellis_9 is offline   Reply With Quote
Old 06-07-2010, 04:33 PM   #55
Tech Regular
 
Slider30250's Avatar
 
Join Date: Feb 2010
Location: Eastern North Carolina
Posts: 428
Default

Quote:
Originally Posted by jeff_ellis_9 View Post
It sounds more complex than it really is, once you start tuning your idle you will understand.
__________________
Anyone can crash, I crash with style

Mugen MBX6R/Airtronics M11X/Ninja Engines/Sidewinder Fuel/EB Mods
Slider30250 is offline   Reply With Quote
Old 06-07-2010, 05:17 PM   #56
Tech Addict
 
Join Date: Feb 2009
Posts: 609
Trader Rating: 1 (100%+)
Default

Do you have a throttle return on the carb ? Most people use a rubber band to make sure the throttle is closing all the way . It does sound like the tune is slightly off , but i have seen people mess with the tune a long time only to figure out the throttle is slow to return to idle .
romax is offline   Reply With Quote
Old 06-07-2010, 05:26 PM   #57
Tech Regular
 
Slider30250's Avatar
 
Join Date: Feb 2010
Location: Eastern North Carolina
Posts: 428
Default

Quote:
Originally Posted by romax View Post
Do you have a throttle return on the carb ? Most people use a rubber band to make sure the throttle is closing all the way . It does sound like the tune is slightly off , but i have seen people mess with the tune a long time only to figure out the throttle is slow to return to idle .
It's not the throttle return, he said it idled fine on the box.
__________________
Anyone can crash, I crash with style

Mugen MBX6R/Airtronics M11X/Ninja Engines/Sidewinder Fuel/EB Mods
Slider30250 is offline   Reply With Quote
Old 06-07-2010, 07:36 PM   #58
Tech Regular
 
jeff_ellis_9's Avatar
 
Join Date: May 2010
Location: Grover, NC
Posts: 418
Trader Rating: 5 (100%+)
Default

yes, I have a rubber band and a spring for return. It goes fully closed when servo returns to neutral on its own

and the "too lean" bog I hear people talk about, does that happen when your in upper RPMs driving and try to WOT real fast and it bogs down, maybe even cutting off? Bc earlier when I was out test-tuning I had this issue. Morely I was having trouble with the bog from take off. Like stop and let sit for a couple seconds an then try and take off and I got a bog then it would slowly take off. Its not too bad now but like I say in mid air its revving way high, but not when sitting in the box. I think my reason for my "too lean bog" was that I was getting low temps (190-210) so I kept leaning the HSN, BUT, I use the Spektrum telemetry and I think I had the probe too high on the head. where should I stick probe on head?
__________________
Team Losi Buggy
GO Tech 5 port RB Mods
AKA
HiTec
Spektrum DX3S
jeff_ellis_9 is offline   Reply With Quote
Old 06-07-2010, 07:56 PM   #59
Tech Elite
 
jmaxey51's Avatar
 
Join Date: Dec 2009
Location: Athens, GA
Posts: 3,917
Trader Rating: 7 (100%+)
Default

Quote:
Originally Posted by jeff_ellis_9 View Post
yes, I have a rubber band and a spring for return. It goes fully closed when servo returns to neutral on its own

and the "too lean" bog I hear people talk about, does that happen when your in upper RPMs driving and try to WOT real fast and it bogs down, maybe even cutting off? Bc earlier when I was out test-tuning I had this issue. Morely I was having trouble with the bog from take off. Like stop and let sit for a couple seconds an then try and take off and I got a bog then it would slowly take off. Its not too bad now but like I say in mid air its revving way high, but not when sitting in the box. I think my reason for my "too lean bog" was that I was getting low temps (190-210) so I kept leaning the HSN, BUT, I use the Spektrum telemetry and I think I had the probe too high on the head. where should I stick probe on head?

the telemetry is not accurate at all, IMO dont use it. but yes your running out of fuel at WOT, that is very rough on the engine, it could make it fail prematurely. my advice is get a decent temp gun or borrow someones. also ask someone to help you. also if there is no smoke its to lean, it should have good smoke. if its running great and smoking then leave it alone, dont keep leaning it or anything unless its way hot. i use temp as a guide line but not strictly for tuning. my engines have had long life spans, i had an used STS engine i bought for 60 bucks make it 4-5 gallons. and the guy i brought it from said it has probably 5 or so gallons on it.

also if you have a question about tuning that engine send romax a PM, he is my dad and tuned that engine up.
jmaxey51 is offline   Reply With Quote
Old 06-07-2010, 07:58 PM   #60
Tech Regular
 
jeff_ellis_9's Avatar
 
Join Date: May 2010
Location: Grover, NC
Posts: 418
Trader Rating: 5 (100%+)
Default

so you mostly go by smoke and sound right?

Also, about the smoke, is that for the HSN setting ONLY? Or can the LSN have a real effect on the smoke?
__________________
Team Losi Buggy
GO Tech 5 port RB Mods
AKA
HiTec
Spektrum DX3S
jeff_ellis_9 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
EPMTs check in here. (a subsidiary of TNT) overtki11 Singapore R/C Racers 55470 05-07-2017 11:57 PM
what is the best way to stop a nitro engine? lewis666 Nitro Off-Road 107 06-02-2014 02:37 AM
runaway car problems thinguy10 Electric Off-Road 10 10-18-2013 11:10 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 04:59 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net