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Noise limit test

Posted: Tue Aug 29, 2006 9:06 am
by ryallm
I am heading down to a TD at Croft this weekend which has a 98 Db static limit. Not wholly confident that my Larini will make it. It was measured at 96 last time I was at Croft, but I am convinced it has got louder since then. Bit of a long shot, but before I go through the hassle of putting the standard exhaust back on, does anyone in the Edinburgh area happen to have access to a noise meter?

Mark

Posted: Tue Aug 29, 2006 9:12 am
by ryallm
Oh, and I should have mentioned that there are still a couple of places left at Croft on Sat if anyone wants to join Tim and myself on a real circuit rather than that wee kart track in fife :D

Mark

Posted: Tue Aug 29, 2006 9:13 am
by Rich H
Do you have a cat? That would be the most obvious choice....

Posted: Tue Aug 29, 2006 9:19 am
by ryallm
RICHARDHUMBLE wrote:Do you have a cat? That would be the most obvious choice....
Yup, cat still in. Jamie told me my car sounded at least as loud as a stage 2 from the pit wall last time out at KH, but the Croft noise test is static in the pit lane and the Larini is only really loud under load.

Mark

Posted: Tue Aug 29, 2006 9:33 am
by tut
If it is a static test, what has worked in the past is a wad of wire wool part way up the end pipe, with a non obvious piece of wire around it to pull it back out.

Also cheating works if there is only one tester, with no one looking at your tacho. Take the revs up slowly and hold 500 rpm below what they asked for.

tut

Posted: Tue Aug 29, 2006 9:42 am
by ryallm
tut wrote:If it is a static test, what has worked in the past is a wad of wire wool part way up the end pipe, with a non obvious piece of wire around it to pull it back out.

Also cheating works if there is only one tester, with no one looking at your tacho. Take the revs up slowly and hold 500 rpm below what they asked for.

tut
A cunning plan - there was only one tester there last time :twisted:

Posted: Tue Aug 29, 2006 11:32 am
by mckeann
As tut says, dont go to the full revs if you can possibly avoid it. Another tip is not to lift off until the test is finished, as lifting off can make the exhaust louder. Robin taught me this one.

Thankfully the honda will always pass static noise tests as it doesnt engage the VTEC and wont rev up pass 5500 rpm when at a standstill. clever engine. Mines would fail most drive-by's though :(

Posted: Tue Aug 29, 2006 11:34 am
by Sanjøy
tut wrote:If it is a static test, what has worked in the past is a wad of wire wool part way up the end pipe, with a non obvious piece of wire around it to pull it back out.

tut
Make sure it is well jammed down as the wire wool will glow red hot and can be spat out. There is egg on your face and there is molten metal on the marshalls!

Posted: Tue Aug 29, 2006 12:32 pm
by simon
mckeann wrote:Thankfully the honda will always pass static noise tests as it doesnt engage the VTEC and wont rev up pass 5500 rpm when at a standstill. clever engine. Mines would fail most drive-by's though :(
Mine won't rev past 5k unless it's warmed up, do the yotas do something similar?

Posted: Tue Aug 29, 2006 12:34 pm
by Shug
simon wrote:
mckeann wrote:Thankfully the honda will always pass static noise tests as it doesnt engage the VTEC and wont rev up pass 5500 rpm when at a standstill. clever engine. Mines would fail most drive-by's though :(
Mine won't rev past 5k unless it's warmed up, do the yotas do something similar?
Pretty sure they won't let you engage hairy cam until warm, but I don't own one, so can't say fer sure... 8)

Posted: Tue Aug 29, 2006 12:38 pm
by mckeann
yeh, the honda has the low temp cut out for the VTEC, and the low oil pressure cutout for the VTEC but it also has a standstill cut out. Its like a mini launch control, thats perfectly calibrated for AO48's :lol:

Re: Noise limit test

Posted: Tue Aug 29, 2006 12:42 pm
by Lawrence
ryallm wrote:I am heading down to a TD at Croft this weekend which has a 98 Db static limit. Not wholly confident that my Larini will make it. It was measured at 96 last time I was at Croft, but I am convinced it has got louder since then. Bit of a long shot, but before I go through the hassle of putting the standard exhaust back on, does anyone in the Edinburgh area happen to have access to a noise meter?

Mark
I have one

Posted: Tue Aug 29, 2006 12:47 pm
by ed
Shug wrote:
simon wrote:
mckeann wrote:Thankfully the honda will always pass static noise tests as it doesnt engage the VTEC and wont rev up pass 5500 rpm when at a standstill. clever engine. Mines would fail most drive-by's though :(
Mine won't rev past 5k unless it's warmed up, do the yotas do something similar?
Pretty sure they won't let you engage hairy cam until warm, but I don't own one, so can't say fer sure... 8)
yeah thats right, temp guage needs to register before it will let you, even if the cars been running and turned off.

Posted: Tue Aug 29, 2006 5:05 pm
by jamie
I dont hold much hope for you with the static :( good luck I think you might need it

Posted: Tue Aug 29, 2006 5:51 pm
by tut
Pessimist!!!!!!!!!!!!!!!!!

There is always a ways and means act.

tut