The best proven easy fix for half tank lean?

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MikeK1981

MikeK1981

ChondroManiac
Messages
2,037
Location
Humboldt, CA
What are some of the best techniques you guys have used to help with, or get rid of HTL that do not involve major modifications? I have an XL that is all stock for now and want to help the temp swings I am getting because of my tank levels. I can get it running sweet with low temps at full tank, and half tank and under but can't find a good balance between the two. I am looking for something simple/cheap preferably. Any suggestions?
 
Try what I said in the other thread it is working for me but I am still doing the midtank for handling looks and to do away with the problem totally
 
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The easiest would have to be the new era models tank setup.
http://www.neweramodels.com/item.cgi?part_id=1704
16 bucks and it is a mount and go upgrade that takes all of 5 min to put on. I have this and the run time might be shorter than the stock tank but think of it this way. you set the HSN/LSN to the half way mark on the stock tank you only get 80cc's of runtime. and run rich on the top half. I get 125cc of perfect run time. Hope this helps.
 
I notice that it does not list the newer XL as being compatible. Is there any reason this would not fit the XL, or is the mounting the same as the 4.6?
 
What is it about the stock tank that causes HTL is it just the larger size or is it the shape? The "L" shape of the tank being larger at the top and smaller at the bottom?
 
Mike, I am pretty sure that it will fit an XL but I don't own one. you might want to ask someone that has the XL and the newera kit. as for the reason for the HTL it is the shape of the stock tank and the surface area of the fuel. when you get to half tank there is only half of the surface area for the exhaust to push down on. This casues the fuel to not have the same pressure to the HSN. making the mill lean out.
 
I do agree with you wild but, he was looking for a cheap and simple fix. From what I read there is a fair amount of work and a cost of around $125-150 for the mid-tank. I went with the new era solution for now just to get rid of the HTL quickly and cheaply. IMO there are better mods to do before you go the mid-tank. but it is all personal preference. I will eventually go the mid-tank myself once I get tired of the shorter run-times that the 125cc tank allows.
 
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MikeK1981 said:
What are some of the best techniques you guys have used to help with, or get rid of HTL that do not involve major modifications?
Click to expand...


your title says "best & easiest way," so in light of that, here is my advice:

Best way to cure 1/2 tank lean is prob. a mid-tank mod.

Easiest mid-tank mod to do is prob. using Platinum RC Products kit # PRC 112 and a Hellfire (or similar) tank. click here for link this kit allows you to keep your steer servo in its current location and relocate your t/b servo, hump pack & Rx.
 
For now I am going to try a couple of the fuel line techniques I saw on you tube by stellarrc and savagejunkie96. Stellarrc tested one and said it seemed to work and the other was just a 2 foot piece of fuel line between the tank and carb. This is something I can do today without waiting or having to order anything and if it doesn't work I'll have a long piece of extra fuel line in my tool box just in case I need it later LOL!
 
Fouteros, I noticed you keep posting questions in posts about different subjects if you create your own post you may be able to get better answers in a shorter amount of time. Just a suggestion, and good luck.
 
he can't make a new thread yet. I believe that he is in probationary period as a new user. this helps keep the spam down. now back to the task at hand. let us know your findings on the 2 feet of fuel tubing. I thought of doing this but I did not want a large coil of tubing that could get tied up.
 
MikeK1981 said:
Fouteros, I noticed you keep posting questions in posts about different subjects if you create your own post you may be able to get better answers in a shorter amount of time. Just a suggestion, and good luck.
Click to expand...

i agree. you'll get more & better answers specific to your situation if you create a thread bro

Magoo said:
he can't make a new thread yet. I believe that he is in probationary period as a new user. this helps keep the spam down. now back to the task at hand. let us know your findings on the 2 feet of fuel tubing. I thought of doing this but I did not want a large coil of tubing that could get tied up.
Click to expand...

he should be able to make a thread straight off the bat. first 5 posts/threads will go to moderation for approval.

thats how peeps make a 'welcome' thread when theyre spankin new 😉
 
I super easy way is to just fill the tank to the half way point and tune from there. Of course you are sacrificing run time.
 
frddyj said:
i agree. you'll get more & better answers specific to your situation if you create a thread bro



he should be able to make a thread straight off the bat. first 5 posts/threads will go to moderation for approval.

thats how peeps make a 'welcome' thread when theyre spankin new 😉
Click to expand...

Took care of it, his questions are in the lrp zr .30 question thread
 
I went to the hobby store and got some fuel tubing and a piece of antenna tubing and I will try the method with just the fuel tubing first and let you guys know how it goes. If that doesn't work I'll try the method stellarrc had on you tube with the extension in the tank and the long piece between the pipe and tank.
 
OK I don't think putting the long fuel tube between the tank and carb did anything. I'm still having trouble with heat and even when the temps are down I'm stalling out when letting off the throttle. I'm going to call HPI tomorrow and tell them this thing is crap LOL! I have tried everything and have not been able to solve my stalling issue. It only does it when going from a lot of throttle to no throttle and sometimes I can hear it bog and save it by blipping the throttle but other times it just stops instantly. I thought it was due to high temps but today it was doing it at 220 and under. I have tried adjusting the low speed in both directions and compensating for the idle and nothing has gotten rid of this problem. Did I just get a bad motor or something? Maybe air leaks? I'm not taking the whole motor apart to seal it up when I just paid that much money for it, that's BS. I guess I'll just have to see what HPI has to say.
 
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I'll try the other fix in the morning. The Uniflow tank mod, I have actually heard of other people having luck with this mod. I already got it done but it's dark out so I'll let you guys know about it tomorrow. I may not be the best person to be reviewing these mods anyway since my problem may or may not be caused by the high temps like I thought.
 
I have to say it seems as though the uniflow tank mod worked for me, the motor stayed between 220 and 230 for the majority of the run and I even saw it as low as 215 with some pretty hard running and the motor was not performing like it was too rich. Good easy fix to get your stock truck running a little better.
 
Ok I wil lgo out on a limb here and I have the fire extinguisher standing by for the flamage, but have you tried an exhaust deflector?? I had to really lean out my HSN when I put the deflector on there becasue of the increase in backpressure it made. Also keeps the oil and gunk away from the truck making it easier to clean. I am sure there may be a decrease in performance, but I didn't notice a huge difference. Its not like I race it anway to really notice a difference.
Another fix I have only heard about with the 5.9, is the CEN pipe. I have seen and heard people who have had success with this pipe and saw an increase in performance. I do not know if it solved the HTL problem, but I have not heard the complaints either.

My .02 🙂

Q
 
AllanQ said:
Ok I wil lgo out on a limb here and I have the fire extinguisher standing by for the flamage, but have you tried an exhaust deflector?? I had to really lean out my HSN when I put the deflector on there becasue of the increase in backpressure it made. Also keeps the oil and gunk away from the truck making it easier to clean. I am sure there may be a decrease in performance, but I didn't notice a huge difference. Its not like I race it anway to really notice a difference.
Another fix I have only heard about with the 5.9, is the CEN pipe. I have seen and heard people who have had success with this pipe and saw an increase in performance. I do not know if it solved the HTL problem, but I have not heard the complaints either.

My .02 🙂

Q
Click to expand...


thats a good point caz my X rtr seemed to run ok with that plastic pipe, but when i upgrade to a THS, getting the mill to run/htl was a complete nightmare.
 
Even better than me explaining it, you can go on you tube and type it in the search bar. There is a complete video explanation of it and a review by username stellerrc. I will put the links to part 1 and part 2 here.

part 1
http://www.youtube.com/watch?v=Lj0f1p9KneU

part 2
http://www.youtube.com/watch?v=hWvpjIN89Jo

The original was by savagejunkie96 but stellerrc's goes a little more in depth. This may not be the best fix for it but can be done with materials many of us have laying around already, and helps until you want to go all out with a mid tank mod or if you don't really want a smaller tank conversion.
 
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