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question for the tuning guru's

Old 04-05-2011, 03:33 AM
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simonRC
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Default question for the tuning guru's

My idle speed screw is set so i have a 1-1.5 gap in the carb,.

My questions are

Why do I need to apply trim to start the car?
Why do I need to keep some trim to keep the car running? even though the wheels still spin whilst off the ground.

thanks as always

Simon
Old 04-05-2011, 05:35 AM
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378
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Default RE: question for the tuning guru's

1: Sometimes the engine needs a bit more throttle to fire off. Mine likes to sputter unless I trim in a bit of throttle.
2: Same reason your full scale car has to fast idle for a few minutes. Cold engines just don't like to idle. You don't have to trim in enough idle to spin the tires though. Most EFI full scale cars jump up to 1800-2100RPM the moment they fire, then within a few seconds they drop down to roundabout 1200-1500. Same thing applies to glow engines, only it's done by you instead of a computer. Once it's warmed up for 30-45 seconds it should be able to idle normally.
Old 04-05-2011, 08:31 AM
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Anthoop
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Default RE: question for the tuning guru's

When the engine is warm then you can return the trim to normal? If the answer is no then LSN is too rich.

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