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3.3 not redlining

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Old 04-21-2006, 02:39 AM
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psychorevo
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Default 3.3 not redlining

First off, let me say that tonight I was racing ovals for about two hours.

My T-Maxx was literally beating(by about 3 feet) a .21 Novarossi and smoking .18s all night. My Revo 3.3 did well but not as jumpy and launchy off the line like the Maxx.

During my last race, my car, all of a sudden, wouldn't top out or hit a high RPM.

It wouldn't rev and would just die out. It kept dying but would finally idle. I hit the throttle all the way but the engine wouldn't full tap out.

So I checked the plug and it was fine but I changed it anyway.

I then lifted the truck and manually opened the throttle, but to no avail, it wouldn't hit redline or higher RPMs.

What do you think the problem is? My temps all night were about 190ish so I was fine there.

I didn't push it and took cooling breaks to keep the engine running cherry.

My guess is an exhaust leak. Do you guys agree?

Thanks much in advance mates!!!!!!!!
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Old 04-21-2006, 03:09 PM
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Default RE: 3.3 not redlining

Okay, I replaced the hoses, tightened the head down, and tightened the exhaust manifold.

Still, the car wont go into higher RPMs. The car also dies out quickly.

Please help!!!!!!
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Old 04-21-2006, 04:01 PM
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Default RE: 3.3 not redlining

high speed needle? also 190 sounds a little cool. i have that problem with some of my cars and all i do is take it gentle and let the car warm up. i can hear the rpm getting higher as i drive aroung until it reaches its full potential
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Old 04-22-2006, 12:55 AM
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Default RE: 3.3 not redlining

I jsut make 1/8 icrements to the hsn until it reaches full rpm. I think 190 is a little cool, my truck runs best between 240-260.
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Old 04-22-2006, 03:39 AM
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Default RE: 3.3 not redlining

RcEnthusiasts and ross jsy,

Thanks a million. I just leaned out the HSN and LSN and my car runs like a champ.

Full RPM achieved.

My only gripe: it ran awesome for the first five races, yet on the last one, it was all of a sudden rich.

Is this what Traxxas engines are know by not holding a tune or is this common for an engine to get out of tune once in a while?

The engine is also quite new.

Thanks again guys..
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Old 04-22-2006, 07:36 AM
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Default RE: 3.3 not redlining

As it gets colder outside it wil richen up....2 hours of running at night its bound too cool off.
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Old 04-22-2006, 10:18 AM
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Default RE: 3.3 not redlining

Others have said that the tune can change with the level of fuel in the tank also. I never really noticed it but thne again I don't race.
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Old 04-22-2006, 10:22 AM
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Default RE: 3.3 not redlining

^
binary terry and hip hop head,

thanks for your input.
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Old 04-22-2006, 10:24 AM
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Default RE: 3.3 not redlining

Nope. When it gets colder, it will lean out. When it warms up, it'll richen the motor. So if you tune in the morning during a race day, and its cool, dont be surprised if you're dog rich by noon as it warms up. If the temps drop by the A-main at 6pm or so, expect a lean running engine.


ORIGINAL: binaryterror

As it gets colder outside it wil richen up....2 hours of running at night its bound too cool off.
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Old 04-22-2006, 12:28 PM
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Default RE: 3.3 not redlining

My truck seems to lose a tune every once in a while. Like yesterday, it was running perfectly in the morning, then in the afternoon, i had to retune the whole thing. This is a great website, it helped me learn how to tune, watch the video's. Hope you figure it out.
http://www.savagebeast.150m.com/id20.htm
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