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Old 08-30-2010, 03:42 PM   #1
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Default trouple tuning hpi 4.6

well im having problems tuning started out with traxxas t maxx had all sorts of problems.then went to hpi savage .....please tell what im doing wrong... thank you.When it fire i can get it to idle then when i give it the gas it falls on its face.

Last edited by travy2007; 08-30-2010 at 03:55 PM. Reason: fogot something
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Old 08-30-2010, 03:49 PM   #2
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Clearly it's not your excellent observational skills and your willingness to explain fine details that are letting you down.

You may actually find someone will offer assitance if you explain what is happening at the moment, and what you have tried to rectify your issue and the outcomes of those tests.
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Old 08-30-2010, 04:11 PM   #3
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just added the problem that im havn thank you
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Originally Posted by LordAnubis View Post
Clearly it's not your excellent observational skills and your willingness to explain fine details that are letting you down.

You may actually find someone will offer assitance if you explain what is happening at the moment, and what you have tried to rectify your issue and the outcomes of those tests.
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Old 08-30-2010, 04:22 PM   #4
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Have you adjusted on the needles any at all ?
If you have, set the needles back to flush and start over.
With the truck warmed up , run a few high speed passes and notice what the truck is doing. If it's not peaking on the top end, start by leaning the top end screw by turning it clockwise. You will want to look at the needle as a clocks face and adjust 1 hour at a time till you get the desired performance. Once you have good power and speed on the top end you then start with the low needle. You may have to adjust the idle on the carb to keep the engine running till adjusted correctly. Run a few high speed passes to get the engine cleared out of extra fuel and bring the truck to a stop and count about 5 good seconds and give the truck a full throttle burst. If the truck stalls and sputters with lots of smoke, the low needle is rich. If it take off really quick it could be lean. The best method of testing this is after a high speed pass, pinch the fule line closed. It should rev and quit at the 3 second mark. If it runs longer, it's rich on the bottom needle. If it quits sooner, it's to lean. Just be patient and you will learn how to tune properly. This method works excellent on the HPI 4.6 engine.
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