LSN help????

[Rooky]

Hai everyone, just a quick question about my tuning.

when the car is at a complete stop, i full throttle it, it will bog down and rav up and bog down, will not go until u let go the throttle and giving it little throttle til its moving, then u can full throttle it works perfect.

according to many website, its the Low Speed Needle proble. but i tried to lean it out 1/8 of turn and its not doing anybetter, rich it out 1/8 of a turn, and its also not getting any better.

what else could be run... once u get it going, it runs super fast at full throttle, so i will not think its HSN......
i can take it back to the hobby shop, but thats my last option, so any reply will be appriciated. ty ty

 

[BamaFan]

Try to richen the HSN needle up some. If you pull the trigger to full throttle on take off and it bogs your too lean on your hsn. Put your lsn back to factory and tune with your hsn. Once you get it running top end real good and ok on take off lean your lsn about a 1/8 at a time. It won't take much leaning on the lsn. After prob 1/4 to a 1/2 turn in on your lsn you should be jumping off the line with a good snappy throttle responce.

 

[Rooky]

Try to richen the HSN needle up some. If you pull the trigger to full throttle on take off and it bogs your too lean on your hsn. Put your lsn back to factory and tune with your hsn. Once you get it running top end real good and ok on take off lean your lsn about a 1/8 at a time. It won't take much leaning on the lsn. After prob 1/4 to a 1/2 turn in on your lsn you should be jumping off the line with a good snappy throttle responce.

set LSN to factory default, and riched out HSN, and its runing properly... tytyty

but one more question, if i let the car idle for like 10 - 20 seconds and then full throttle it, i still get that snappy take off for like a second, is that cuz my idle too high or LSN too rich?

 

[BamaFan]

set LSN to factory default, and riched out HSN, and its runing properly... tytyty

but one more question, if i let the car idle for like 10 - 20 seconds and then full throttle it, i still get that snappy take off for like a second, is that cuz my idle too high or LSN too rich?

If your getting a snappy responce for a split sec off the line then your bogging your too lean on your hsn. If your way lean on your lsn your idle will be extremly high and your idle screw will have no effect. Have you tried the fuel pinch test to see what you lsn is doing? If you pinch the fuel line as close to the carb as possible after the engine is warm and the engine dies immediatly then your lsn is too lean if it runs for more than 5 sec your too rich on your lsn if it revs for about 3 sec then dies your just right. The perfect HSN setting is after a wot run and you let off the trigger your engine should stay reved up for about 5 sec then come back down to a good idle. If after a wot run you let off and your engine dies your too rich if after a wot run and you let off and it stays at a high rev for more than 5 sec your lean.

---------- Post added at 11:22 PM ---------- Previous post was at 11:18 PM ----------

You always tune your HSN first then dial in the LSN. Thats why I said put the lsn back to factory or just a little leaner than factory. I don't ever mess with my lsn after i tune it after the break in period.

 

[Rooky]

If your getting a snappy responce for a split sec off the line then your bogging your too lean on your hsn. If your way lean on your lsn your idle will be extremly high and your idle screw will have no effect. Have you tried the fuel pinch test to see what you lsn is doing? If you pinch the fuel line as close to the carb as possible after the engine is warm and the engine dies immediatly then your lsn is too lean if it runs for more than 5 sec your too rich on your lsn if it revs for about 3 sec then dies your just right. The perfect HSN setting is after a wot run and you let off the trigger your engine should stay reved up for about 5 sec then come back down to a good idle. If after a wot run you let off and your engine dies your too rich if after a wot run and you let off and it stays at a high rev for more than 5 sec your lean.

---------- Post added at 11:22 PM ---------- Previous post was at 11:18 PM ----------

You always tune your HSN first then dial in the LSN. Thats why I said put the lsn back to factory or just a little leaner than factory. I don't ever mess with my lsn after i tune it after the break in period.

just ran out last drop of fuel, haha i will try that tomorrow. just to make sure, wot run is runing at the full speed?

i knew about the pinch fuel line test, but i ALWAYS ALWAYS forget >.>
just made myself a note, hope i remember that =P

thanks man =)

---------- Post added at 12:33 AM ---------- Previous post was at 12:30 AM ----------

http://www.ehow.com/how_5478805_tune-nitro-rc-car.html

so this is wronggggg, i thogut its cuz of LSN cuz of this website. haha

 

[hamz9561]

Try following this link:

https://www.rcnitrotalk.com/forum/showthread.php?t=60832

It has some really good info on tuning.