twybrow
|
| posted on 24/3/09 at 04:20 PM |
|
|
Changing fuel map to lower noise?
Is there anything you can do to a fuel map (EFI), to reduce noise? I understand OEM have peaks and troughs in a map, for both emissions and noise. Can
we do the same?
I have the oppurtunity to make any changes to my map before SVA next week, and just wondered if a leaner or richer burn would be quieter?
|
|
|
|
|
matt_claydon
|
| posted on 24/3/09 at 05:03 PM |
|
|
With direct injection engines, petrol or diesel, you can make relatively pronounced changes to noise by altering injector timing. You may be able to
have some effect on a port-injected engine but assuming it was running properly to start with it probably wouldn't be that much. I would expect
spark timing to have more effect if anything.
|
|
|
twybrow
|
| posted on 24/3/09 at 05:44 PM |
|
|
Ahh that could work too. I can control both fuel and spark right across the range.... So would you advance or retard the ignition to reduce noise?
This is only at idle, so I would hope either way if is fairly engine friendly...!
|
|
|
matt_claydon
|
| posted on 24/3/09 at 06:17 PM |
|
|
You'd be better just playing, I don't think you could definitely say whether advancing or retarding would be best.
Surely it doesn't matter what it is at idle, the noise test is done at 3/4 of max power RPM?
|
|
|
twybrow
|
| posted on 24/3/09 at 11:46 PM |
|
|
Sorry, forgot to engage brain. I meant it is at no load, so should be engine safe....
|
|
|
