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Should my Revo 3.3 do wheelies ???

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M

MadKawi650

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Location
Halifax, Nova Scotia
RC Driving Style
  1. Bashing
I just put a brand new 3.3 in my revo, broke it in by the book (letter for letter).

The instructions say not to give it too much throttle to avoid flipping over backward... No fear of that here.

I had the needles set to factoy settings for breakin, and I have tweaked a bit from there. There is a trail of blue all the way to wide open and beyond. So I leaned it out bit by bit. Not really any difference..

I played with the low speed and if I lean it out any it chokes when I punch the gas.

((oh yeah,, Slipper clutch seems tight)) so I've eliminated that factor I think.

I think I'm missing out on power here.. Whats your opinions ??
 
Your engine will get more powerfull a few tanks after break in... If you want wheelies you could stiffen up the rear shocks, and change the gearing. Fewer teeth on the clutchbell, and more teeth on the spur gear. This will, of coarse, sacrafice some top end. If you followed breakin word for word you have changed the glow plug and cleaned the air filter. Your current rig may be somewhat to blame as well. Hows your gapping between the clutch bell and spur? Does it have a FOC (foward only conversion)? How about your tires, wobbly ones will create more drag. Worn clutch shoes are another reason. I'm not positive Revos are known for wheelies. But... best of luck to you.
 
I just broke in a 3.3 in my revo 2.5 and it wheelies on demand. If the motor spools up good then I would definately check the slipper clutch...
 
I can try tightening the slipper a bit more. that might help... It seems to grap a wheelie every so often, mainly when I pump the throttle with the rig moving about 5-10 mph, never from idle.

I am on tank 7 (5 breakin plus 2) and I am still running the same glow plug that came with the new motor.

What is the purpose of the glow plug after the engine starts ??? I thought it just heats up when the ez start is connected and then its job is done...

I'm not worried about top speed loss.. this thing is Crazy fast, too fast for where I drive it. The tires balloon up to about 7 inches tall when its flying.

I have the stock 15t CB and a 40 tooth spur. The rear shocks seem soft, but I have them cranked and I have upgraded one level on the rear springs.
 
MadKawi650 said:
I can try tightening the slipper a bit more. that might help... It seems to grap a wheelie every so often, mainly when I pump the throttle with the rig moving about 5-10 mph, never from idle.

I am on tank 7 (5 breakin plus 2) and I am still running the same glow plug that came with the new motor.

What is the purpose of the glow plug after the engine starts ??? I thought it just heats up when the ez start is connected and then its job is done...

I'm not worried about top speed loss.. this thing is Crazy fast, too fast for where I drive it. The tires balloon up to about 7 inches tall when its flying.

I have the stock 15t CB and a 40 tooth spur. The rear shocks seem soft, but I have them cranked and I have upgraded one level on the rear springs.
Click to expand...

Glow plug - the glow plug has maintain heat to ignite the fuel once it is started the heat comes from ignition that is why you warm it up a bit. you may check the clutch inside the CB also to see if it is slipping there mine runs a 15/38 and wheelies pretty good.
 
If you are punching the throttle and it's choking, or if you have 'blip' the throttle to get it up and running, the LSN is too rich. Since you just broke it in, I'd keep it a little rich for a few more tanks (JMO). The only time a Revo won't pull a wheelie is if you install a center differential.
 
zinkerone said:
Close... the heat comes from the compression
Click to expand...

Close... The ignitor heats the coil to detonate the fuel and air mixture during compression. When the engine is running, the continuous explosions in the cylinder keep the filament glowing hot enough to ignite the next stroke.
 
So what difference could a glow make once the engine is running. If it heats up to start the engine, wouldn't it work to keep it going ?

If the choking my revo is doing is cause its to rich on the LSN, why would it get worse when I make it leaner and get better when I fatten it up. Only thing I see when I fatten it up, is that it smokes like a freight train.

Could the HSN settings affect the Low speed ? Could the glow plug cause the Blaaaa, Reeeeeee.
 
Still waiting for LHS to get the temp gauges in, so I don't have a temp to go by. It burns my fingers if that helps : ) haha

It was about 55-60°F, Cloudy and windy...

I know without the engine temp its hard to tell..

From all I have read over last few days, I have the symptoms of running rich or Over heating. I will have to get the engine temp to rule that out.

Also,,, My throttle is not returning to idle unless I adjust the trim all the way left or negative, or off, or whatever you call it. Is there a way to center the servo ?
 
MadKawi650 said:
Also,,, My throttle is not returning to idle unless I adjust the trim all the way left or negative, or off, or whatever you call it. Is there a way to center the servo ?
Click to expand...

remove servo horn turn on TX and RX center your trim and then replace servo horn making sure your throttle linkage is properly set.
 
You need to turn the trim knob all the way down to zero. Then hold the trigger in the brake position and adjust the idle screw while looking into the carb neck. (1 or 2 mm opening)
Now start the car and fine tune the idle when the engine is warmed up. The trim knob is only to help it start or warm up.
 
I have the idle set to about 1mm, but what I'm wondering is why my resting servo does not close the throttle. It used to work, could it get out of adjustment ?
 
i have a stock revo no wheelies unless it goes over a bump then
hit the gas good and it will do one and i just got a 3.3 t-max broke it
in and out the box my t-max is way faster than my revo what gears do i need
to make my revo wheelie thanks very much I'm mark at bigbizz40 at hotmail
 
bigmark said:
i have a stock revo no wheelies unless it goes over a bump then
hit the gas good and it will do one and i just got a 3.3 t-max broke it
in and out the box my t-max is way faster than my revo what gears do i need
to make my revo wheelie thanks very much I'm mark at bigbizz40 at hotmail
Click to expand...


From my experience all you need is stiffer rear shocks and it will pull wheelies all you want.
 
I have been going by the tuning guide I found on here and I'm happy with how its running. It says to tune your hsn...then tune your lsn for max launch. I wouldnt know much about the wheelies since my used revo has the center diff(and I'm a complete noob). Go to this link and check it out to see if it helps: http://www.rchobbies.org/cars_eng-tuning.htm
 
IMHO, a lot of peoples problems with out of the box revo's is the throttle linkage. It's horrible to say the least. The TRS is far too strong for the servo/linkage they use. I've seen it bend the throttle wire and keep the carb from opening more than 1/2.

This is what could be causing your lack of wheelies or decent power out of the 3.3.

If I were to get a new revo, I'd redo the throttle linkage before even firing it up the first time. Remove the stock TRS and throttle wire. Get a softer spring that attaches to the carb directly. Make a longer throttle wire that you can put collars and springs on like this:
2005-1201-RevoThrottleLinkageHiRes.jpg


That was my first draft when I had a revo and I pretty much stuck with it. I used traxxas collars/springs from the t-maxx, standard threaded wire from my LHS and a dubro ball end. I also replaced the bushings in the throttle pivot with bearings. Worked as smooth as silk then.

I had the collar on the end putting pressure on the spring, this is what kept the carb shut. The spring compresses when you apply brakes.
 

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