RE: Official XXX-NT Thread!!!  
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    • All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Nitro Stadium Trucks >> RE: Official XXX-NT Thread!!!
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    RE: Official XXX-NT Thread!!! - 7/31/2007 3:35:28 PM   
    baef


     

    Posts: 18
    Joined: 5/14/2007
    From: Lake Orion, MI, USA
    Status: offline     		I will try to lean it out and see if that makes a difference.. I haven't tried much of anything yet, just wanted to throw it out there.

    (in reply to alexandreibanez)
           Post #: 1576

    RE: Official XXX-NT Thread!!! - 7/31/2007 3:40:11 PM   
    av8torjim


     

    Posts: 140
    Joined: 5/25/2006
    From: Winston-Salem, NC, USA
    Status: offline
    quote:

    Question about engine tuning. The car seems to run good how it is tuned now but it seems that most of the time, if I am stopped and punch it, the engine boggs way down before it will take off, sometimes it even stalls. Do you think I am running to rich?


    Try leaning your low speed needle a little at a time. It sounds like you're loading up on fuel during idle. Set the high speed needle set properly first, then change the LSN. The pinch test is a good way to do it. Search the forums for "pinch test." Once you get the LSN set correctly, there should be a smooth transition to higher RPMs. You might need to tweak the HSN after you adjust the LSN, depending on your engine.

    (in reply to baef)
           Post #: 1577

    RE: Official XXX-NT Thread!!! - 7/31/2007 9:34:51 PM   
    baef


     

    Posts: 18
    Joined: 5/14/2007
    From: Lake Orion, MI, USA
    Status: offline     		Thanks av8torjim, I read on my engine manual about the pinch test. I will try that. I just replaced my entire carb with a brand new one so I assume it will need a bit more adjusting, I have never tried adjusting the low speed needle.

    (in reply to av8torjim)
           Post #: 1578

    RE: Official XXX-NT Thread!!! - 7/31/2007 9:55:13 PM   
    damanfrgr


     

    Posts: 35
    Joined: 2/18/2006
    From: Cedar Springs, MI, USA
    Status: offline     		yup got the slipp info but t he glitch u think might be old crystals? I did go swimming last yr but its has worked fine ever since ., I guess i will double check all conn. and we will go from there. when i ts on my box and i give it throttle it does the same ting at 3/4 throttle the sterr servo will turn right at 3/4 thrott??so i dont think its in the rear its a glitch some how some way??thanks

    (in reply to baef)
           Post #: 1579

    RE: Official XXX-NT Thread!!! - 8/1/2007 3:31:18 AM   
    baef


     

    Posts: 18
    Joined: 5/14/2007
    From: Lake Orion, MI, USA
    Status: offline
    quote:

    ORIGINAL: av8torjim
    Try leaning your low speed needle a little at a time. It sounds like you're loading up on fuel during idle. Set the high speed needle set properly first, then change the LSN. The pinch test is a good way to do it. Search the forums for "pinch test." Once you get the LSN set correctly, there should be a smooth transition to higher RPMs. You might need to tweak the HSN after you adjust the LSN, depending on your engine.



    So I do the pinch test and the RPMs speed way up, so it seems that it is too rich so I adjusted that.. Then I leaned off the HSN and wow, what a difference.. Its a fine art getting it tuned right. My question is, will I always have to tweak it based on the temperature outside and after the engine is warmed up?

    I leaned it up and wow does the truck GO when it is lean, it accelerates so fast, it pops wheeles and actually did a back flip on level ground but that temp went up way to high on the engine, I need to find a happy medium. I don't really race the truck so I don't need super performance so a bit rich would be better since it will make the engine last longer but I also do not want it to stall from getting to much gas.

    (in reply to av8torjim)
           Post #: 1580

    RE: Official XXX-NT Thread!!! - 8/1/2007 3:46:26 AM   
    alexandreibanez


     

    Posts: 34
    Joined: 7/30/2007
    From: Livonia, MI, USA
    Status: offline     		I think what you should do is try to switch servos around. After you switch them, check to see if the same servo glitches. If it does, then its just a bad servo that you have to replace. If the servo that was in the throttle is clitching in the steering place then you know it could be a bad reciver. Just remember to switch the ends at the receiver, I don't think I need to tell you that, but some people like me tend to forget to check that stuff. Anyway man if none of these help then I think your truck came out of an excorcism movie and likes to have seziers what the engine rips....haha.

    (in reply to baef)
           Post #: 1581

    RE: Official XXX-NT Thread!!! - 8/1/2007 4:36:07 AM   
    av8torjim


     

    Posts: 140
    Joined: 5/25/2006
    From: Winston-Salem, NC, USA
    Status: offline
    quote:

    My question is, will I always have to tweak it based on the temperature outside and after the engine is warmed up?

    I don't really race the truck so I don't need super performance so a bit rich would be better since it will make the engine last longer but I also do not want it to stall from getting to much gas.


    You shouldn't have to tweak it every time you use it. I only make adjustments if there has been a drastic change in temperature since I got it adjusted properly. Humidity and temperature can make a difference. I forget the basic rules, but I think hotter temps mean thinner air, so you need to lean the HSN (less air needs less fuel to keep the same air to fuel ratio) and vice versa.

    I try to run a little on the rich side. It's better for engine longevity. I'm just getting interested in racing, so I haven't had the need for the nth degree of performance. Good luck.

    (in reply to alexandreibanez)
           Post #: 1582

    RE: Official XXX-NT Thread!!! - 8/2/2007 11:22:49 PM   
    damanfrgr


     

    Posts: 35
    Joined: 2/18/2006
    From: Cedar Springs, MI, USA
    Status: offline     		yup ill try that and see what happens.? THAnks GET BACK WITH YA. Flying and driving I will check it out and see whats up. Probly not right place to say this but just got a stryker brushless and it bad a#$

    (in reply to av8torjim)
           Post #: 1583

    RE: Official XXX-NT Thread!!! - 8/3/2007 6:50:35 AM   
    losixxx-nt


     

    Posts: 1631
    Joined: 9/11/2003
    From: ovideo, FL, USA
    Status: offline     		wow its been along time since ive posted anything to deal with rc's if anyone needs any parts off of my xxx-nt let me know and ill see what i can do. but other than that im done with the hobby. im most likely gonna keep the 4-tec though.....

    _____________________________

    xxx-nt, fr15 and mip stinger exaust,- nxt picco .12
    nitro 4-tec 2.5 soon to have 05 fantom .18 ,-traxxas 4-tec

    (in reply to damanfrgr)
           Post #: 1584

    RE: Official XXX-NT Thread!!! - 8/3/2007 6:54:44 AM   
    yamahauler236


     

    Posts: 88
    Joined: 7/31/2007
    From: Kennewick, WA, USA
    Status: offline     		What is the biggest problem on the xxx nt? I just ordered one and i wanna be prepeared!!! Thanks for all you help

    (in reply to losixxx-nt)
           Post #: 1585

    RE: Official XXX-NT Thread!!! - 8/3/2007 7:21:35 AM   
    losixxx-nt


     

    Posts: 1631
    Joined: 9/11/2003
    From: ovideo, FL, USA
    Status: offline     		the mach .15, the transmission, and the a-arms

    _____________________________

    xxx-nt, fr15 and mip stinger exaust,- nxt picco .12
    nitro 4-tec 2.5 soon to have 05 fantom .18 ,-traxxas 4-tec

    (in reply to yamahauler236)
           Post #: 1586

    RE: Official XXX-NT Thread!!! - 8/3/2007 8:30:26 AM   
    alexandreibanez


     

    Posts: 34
    Joined: 7/30/2007
    From: Livonia, MI, USA
    Status: offline     		Yes losixxx-nt is right. The trans and the a-arms are the most breakable commen parts and also the break hub that the disk break slides over. I am soon to have full aluminum gears in a week. Has anyone ever thought about placing rubber o-rings between the motor mounts and the engine to lower the amount of vibration that goes threw the truck? Only asking cause I am in the procces of building an all aluminum and titanium xxx-nt and I would like to have less vibration so my radio and servos do not get messed up over time.. I'll post pictures soon!

    (in reply to losixxx-nt)
           Post #: 1587

    RE: Official XXX-NT Thread!!! - 8/3/2007 3:21:55 PM   
    RCtruckRacer



    Posts: 3251
    Joined: 6/2/2005
    From: Eugene, OR, USA
    Status: offline     		Rubber mounts will flex (which would allow it to disperse the vibrations) and throw off your gear mesh. I would not recommend it.

    _____________________________

    Some people see the glass half full. Others see it half empty. I see a glass that's twice as big as it needs to be.
    My opinions are my own, and are not necessarily those of RCU

    (in reply to alexandreibanez)
           Post #: 1588

    RE: Official XXX-NT Thread!!! - 8/7/2007 3:18:17 AM   
    yamahauler236


     

    Posts: 88
    Joined: 7/31/2007
    From: Kennewick, WA, USA
    Status: offline     		Ok i just got the xxx nt. This is my first nitro. On the controler if i go to the menu rev/norm on norm when i pull the trigger back its on brake but on rev whell i push the trigger forward its brake. I like the push the trigger forward for brake. I havent started the car will the rev mode mess around with the throttle trim? Thanks

    (in reply to RCtruckRacer)
           Post #: 1589

    RE: Official XXX-NT Thread!!! - 8/7/2007 7:31:26 AM   
    crispyspa



    Posts: 804
    Joined: 11/2/2004
    From: onalaska, WI, USA
    Status: offline     		As far as I know, the reverse function will "mirror image" the trim settings so there shouldn't be any problem there, but if there is...just re-do the trim.

    _____________________________

    "Are you alright, son? I keep hearing the most terrifying sounds in there." (Foghorn Leghorn)

    (in reply to yamahauler236)
           Post #: 1590