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Author overrun?
BarnshaW
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Registered: 25th Oct 06
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9th Jul 09 at 11:28   View User's Profile U2U Member Reply With Quote
n00b question but what does this mean? when someone says their car sounds good on overrun. is this when you let off the accelerator on high RPM?
alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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9th Jul 09 at 11:30   View User's Profile U2U Member Reply With Quote
Yessai.
Pete_vxl
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Registered: 24th Nov 06
Location: Lochgelly, Fife
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9th Jul 09 at 11:37   View User's Profile U2U Member Reply With Quote
at any rpm i think
scottl
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Registered: 10th Jun 09
Location: scotland
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9th Jul 09 at 11:43   View User's Profile U2U Member Reply With Quote
its called overgum when you drive across chewin gum.
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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9th Jul 09 at 12:22   View User's Profile U2U Member Reply With Quote
When you back off the accelertor at high RPM at high road speed, so the engine is literally 'free-wheeling', this is when you tend to get lots of back firing.
ajscorsa
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Registered: 30th Apr 02
Location: Perceton, North Ayrshire
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9th Jul 09 at 12:55   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by DaveyLC
When you back off the accelertor at high RPM at high road speed, so the engine is literally 'free-wheeling', this is when you tend to get lots of back firing.


yup and if u tap the throttle gently every now and again on over run it'll bang lol
Ibrahim
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Registered: 5th Aug 07
Location: West Midlands
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9th Jul 09 at 13:15   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by scottl
its called overgum when you drive across chewin gum.
alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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9th Jul 09 at 16:30   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by ajscorsa
quote:
Originally posted by DaveyLC
When you back off the accelertor at high RPM at high road speed, so the engine is literally 'free-wheeling', this is when you tend to get lots of back firing.


yup and if u tap the throttle gently every now and again on over run it'll bang lol


If your car's capable. It's not going to happen on every car.
Graham88
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Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
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9th Jul 09 at 16:32   View User's Profile U2U Member Reply With Quote
I thought you could only do it on Turbo cars
alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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9th Jul 09 at 16:39   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Graham88
I thought you could only do it on Turbo cars


Nope, a guy with a cheap exhasut on his 172 proves this theory wrong every morning at work

Flames or popping/banging is basically just unburnt fuel reaching the exhaust and burning in it as far as I know. You could make a 1.2 clio pop and bang its little french tits off as long as you're overfuelling it enough.

[Edited on 09-07-2009 by alan-g-w]

 
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