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New revo Tuning questions.

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nikes614

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After the debacle with my EZ-start controller, I finally got through the break-in process with my new REVO last night. I called in sick today, and ended up having a little fun with my new toy :) I finally found the idle adjustment... the manual kept me guessing for a while. OK, so you pros out there... what is the best way to tune your ride? What process do you go through? I'm in AZ, so it will probably be kinda warm when I'm bashing around.
The problem I have had is that all day today, me engine would stall. Of course it usually happened when it was pretty far away. It usually happened when I let off the throttle after a fast pass, and turned around to come on back. It's like it idled down so low that it cut out. The thing is, I think my idle speed is set pretty high. I think my HSN is set pretty well, I see smoke when I give it gas, there isn't a lot of unused fuel spewing out of the pipe. The engine doesn't seem too hot (no steam or smoke) and it doesn't seem to cut out of loose power when I accelerate quickly. It changes into 2nd gear OK, and really screams!
I think my LSN is the problem. I'm not getting any wheelies or high torque like I'm used to with my E-Maxx. I know nitro is different... I tightened up my slipper-clutch a little bit, but I haven't tested it yet. Anyone have a rule of thumb on slipper-clutch settings? What do I look for in a correct LSN setting? I think I set the Idle after that. The manual says to turn the throttle trim back to apply the break when setting the Idle. I didn't really get why that was necessary. Sorry for the Novel... does anyone that had the time to read this have any insight for me? Thanks!
 
It sounds like everything is about right, especially just after break in.
You need to set your idle with the trim all the way off. You only raise the trim knob for cold starts and warming up. When it's warm, reset the idle. All the adjustments should be made when it's at running temp.
If the idle isn't set with the trim off, it will usually stall the car when you apply the brakes.
Don't be in a hurry to make a ripper out of it. Let it stay a little rich for several tanks, tweeking just a hair each tank or two.
A good, proper break in will give you a reliable long lasting engine.
By the way, posting in bold makes for tough reading.
 
Don't expect wheelies with a Revo, the monocoque shock setup will really keep the front end down. You will see them, depending on your setup but pretty much stock settings and engine and such you keep all four planted. Take Rolex's advice on the thottle trim. It might take a few tanks too for it to shift. Patience grasshopper.
 
When y'all run, do you see smoke @ idle, or just a good plume when you're gassin the throttle? I wonder if I'm running too rich. So when the thing stalls when I put on the breaks and turn, it's cause the idle is too low? The only way to tell is sound, right? Should I have tightened my slipper-clutch for more torque?
 
It still stalls when you put on the brakes?
Again, turn your trim knob ALL the way off, and manually set your idle screw till it idles at the proper RPM.
If you use the trim knob to set the idle, applying the brakes will close the carb below an idle speed. That's why it needs to be adjusted with the trim off.
At idle, you should be getting some 'spit drops' of oil on your finger when you hold it close to the exhaust. If it gets real oily fast, it's too rich on the LSN.
Stop looking for wheelie power. The engine is still breaking in. It won't completely get its' best power and RPM till more than a gallon has been through it.
 
I use a piece of .020" safety wire to set my idle, maybe just a little less. As far as the LSN, wait until you get the other end tuned up. After it's running on the high end and warmed up do the pinch test. Pinch the fuel line and count to see how long it runs before dying out. Should be about 5 seconds. Shorter and your too lean, longer and your too rich. But don't do this until you get your idle set right and your HSN set right.
 
the best way to tune it is take it to hobbytown and have them do it. i was having problems tuning my savage .25 so i took it in today. i can't wait to get it back!


mark
 
Thanks Rolex and Jet... those suggestions sure make it sound a lot easier! I'll let you know how it goes!
 
Well, Scott at Hobbytown does know his stuff. He helped me a couple of times. He'll actually show you what he's doing so you'll be able to do it yourself. Sort of a "teach a man to fish", type of thing.
 
So I went down to Hobby Town on Saturday and I have to say... Scott does know what he's talking about. I tuned it right up. It was doing quite well until I messed with it again. I have to say... I have not been very impressed with the way I've been treated the MANY times I've gone into Hobby Town. You get the feeling they don't care for you unless you race with them and stuff. Scott however, was excellent. He gave me his card and said to call him with any questions. He wouldn't even let me pay him. Thanks for the advice!
 
You not alone in your feelings with Hobbytown. They are about the only game in town for me with one on the northside and one on the southside of town. There's like one or two guys in there I can stand.
 

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