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Herbieace

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hey guys,
I was having a heck of a time getting my T-Maxx to start today. When I was about to throw it in the garbage, I noticed that the yellow ground wire was just hanging free under the motor. I shoved it into the fins of my ACNC head, and then it fired right up. My problem is now that I screwed up the settings so bad trying to figure out what was wrong. My on board temp guage registered 289.2 and I was running it in a bunch of snow. That is pretty hot, isn't it? I really need help figuring out how to start over with the tuning and try to get the car to run consistently.
When I got WOT it always cuts out. it also just cuts out when I throttle down or stop sometimes. I can run it fine, and I had a ton of fun making strange tracks in the snow in my yard, but I want to show it off tomorrow, and i am worried about the settings.
I also have no idea where the yellow ground wire for teh ez start is supposed to be attached.
Please Help a newbie. :shrug:
 
The yellow wire is connected between the engine and the mount, on the right side. You will see a copper connector there, where the wire broke off.
To get you temp to normal, close the HSN and back it out 3 1/2 turns from closed.
Set the LSN flush with the inner ring. There is also an external ring that the throttle linkage connects to. Not that one, but the ring inside it.
When the LSN is flush to the inner ring, run the car till it's up to temp. You might have to lean the LSN slightly for low end punch. When that's good, and it idles well without going over 210, don't adjust it any more.
Then make some WOT runs, and adjust only the HSN for good top end.
 
Listen to Rolex's advice, and follow it exactly.

On my Maxx I did not have to make any changes except for idle, and it runs about 165 when warmed up and after 2-3 WOT passes. I might lean the bottom end a bit (LSN) and see if it improves the punch without upping the temp.

Hey Rolex, care to try and help with a steering problem? Mine wanders all over the place. Any ideas?
 
Thanks guys, I'm sure your advice will fix my problem as always.
I did have one more question on the yellow wire though. It isn't broken (it still has the little ring terminal on the end of it), but I can't seem to find an empty screw hole. Does it go on the engine mount between the mount and the engine? I think I see why most people seem to make a starter conversion.
 
The yellow wire still has the ring on it? That means it was never connected.
It goes under the head of the engine mounting screw, right side, rear screw.
As far as steering, Revo Rancher, it's dual servos. Check both linkages and both servo savers. Usually it's a servo saver problem.
 
Rolex, it's my T-Maxx that wanders everywhere. Revo is fine. But I followed your advice and checked the servo saver. It had been knocked around. I think I have it adjusted now. I reset it back into place and retightened the screw. I'll test it tomorrow.

PS: I was thinking the same thing about the yellow wire. Sounds like the factory did not get the loop around the screw and just tightened it enough to hold it for awhile until it came loose. It should be AROUND a screw.
 
Well, I flipped my truck and somehow managed to crack my engine mount, so I guess I'll have to take the screw off anyway. This little tumble made me pause in thought. Is there anythng I can do to protect the my ACNC Giant Head? When I flipped, the head was the tallest point and landing on it seriously munged up the head and aparantly cracket the mount.
No worries, I already found one on E-Bay though. This little bugger is really turning into an addiction.

By the way. . . I got my T-Maxx for Christmas, and every time I break something I put one of those little "crushed" stickers on it. . . I already have 3. Am I being too rough?
 
Do you run with the body? You may need to raise the body a little to protect the head. Also, New Era makes a roll bar for like $35 or so. Check it out.
 
Were you running without a body on it? As long as the lid is there, it offers a lot of protection, even for a large head. Bodies are cheaper than most of the other parts, and they take a lot less time to change.
 
Revo Rancher said:
Listen to Rolex's advice, and follow it exactly.

On my Maxx I did not have to make any changes except for idle, and it runs about 165 when warmed up and after 2-3 WOT passes. I might lean the bottom end a bit (LSN) and see if it improves the punch without upping the temp.

Hey Rolex, care to try and help with a steering problem? Mine wanders all over the place. Any ideas?
Click to expand...

Isnt 165 a little low on temp??? I was told by rolex to have the running temp around 240, and thats with my upgraded cooling head. It was normally staying between 150-200 before adjusting the HSN. Is it okay to have running temps below 200??
 
165 is WAY low. Sorry I missed that, I guess I wasn't paying attention. You either need to lean both needles slightly, or insulate the head if the outside temp is low. Running too cold is almost as bad as running hot.
 
Thanks for the temp input, Rolex. The manual, if I remember correctly, recommends 190 as a good running temp.

It was about 65 out here when I ran it last and checked the temp. Guess I will follow procedure and lean out the HSN first until the temp gets up to about 190 (supposed to be 65 again today) and then lean the low end if it needs some more low end punch.

Funny thing is, that T-Maxx temp came about tank 7, and it was doing wheelies quite easily by then. The Revo, which is on tank 10, and has great top end, has yet to do a wheelie, except when going off of a bump like when I was in the desert a few weeks ago.
 
Lean the LSN very carefully, only 1/16 turn at a time, till you have a good take off. When it's up to temp, do a pinch test on the fuel line, close to the carb. It should speed up slightly, then shut off at about 3-4 seconds. Less than that, and it's a bit lean.
When it's idling well, and the pinch test is right, do several WOT runs and check temps. Lean the HSN for better high end performance. Be sure you see a constant trail of smoke at all times.
When the weather is colder, you actually have to richen the HSN to compensate for denser air.
 
I was running with the body, but the head was higher than the roof. I have since "raised the roof", as it were, and I can tell the the head won't touch the ground now.
Is there anything I need to know before I take the motor off to change out the mount tonight? I wish we had a web cam set-up so you could walk me through the surgery.
 
I wish we had a web cam set-up so you could walk me through the surgery.
Click to expand...

With Rolex, it is starting to get like that....!!!

Rolex, Traxxas recommends adjusting the HSN first and then the LSN. Do you agree?
 
It really isn't all that bad. The first time might be a little confusing, but it's really quite simple. It will all come out as one unit. Engine, exhaust and EZ start. You don't even need to disconnect the fuel lines. Just loosen all 4 engine screws first, then remove the ones underneath to the mount. Then remove the engine screws, slide out the old mount and put in the new.
And if this is considered surgery, I get a pretty hefty consultation fee.
 
Do I need to take off the linkage? Will I be able to get at all of the screws with the gas tank on there?

Sorry for all of the questions. I'm really paranoid about screwing up my maxx before I even get to drive it in decent weather. :rolleyes:
 
Revo Rancher said:
Rolex, Traxxas recommends adjusting the HSN first and then the LSN. Do you agree?
Click to expand...
Once everything is working right, the HSN is about the only thing that needs to be tweaked regularly.
I'm always getting stuck trying to get someone's really messed up engine going, and there's no point in adjusting the HSN if the engine won't start. That's why I'm in the habit of doing the LSN and idle first. If it starts and idles, then it's the HSN.

And yes, you also need to remove the fuel tank. You can get away with leaving the linkage, since the engine isn't going far. If you have a center skid plate, that also has to come off.
 
I can't seem to get my tmaxx to do wheelies. Perhaps I need to adjust the low end..LSN???
 

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