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Topic Review (Newest First)
04-24-2011 03:01 AM
S0C0nFused 150ft? Wow! well then, A turn up should work....one exception. Avoid walls or anything that the sound can 'bounce' against. I.E. move the car as far as possible (if possible) into open area. Also, I should point out that this does little for 'pops' or backfires. There just to multi-frequency to control. Also only works as I have said for upper-midrange and higher. But your only 15db off so I would think it should do it.
add >> it is assumed, but it bears mentioning. you don't want anything that mimics a flare for all the obvious reasons.You want to keep the exit speed of the gases high and directional (gas velocity affects sound pressure waves).
04-24-2011 01:37 AM
tb1999 Posted via FF Mobilethe test in the pits is done from about 150ft with engine revving @approx. 1000<redline. This is just a courtesy check because they will refund your entrance fee if you don't put wheels on track. So if you fail sound check in the pits you can decide if you want to risk losing you entrance fee because you were black flagged for sound. I blew an 84 in the pits and took my chances. After they black flagged me, I had to fit the muffler or go home with no refund after only one session.
04-23-2011 11:34 PM
S0C0nFused Hmmm! If there doing it in the pits then you might be SOL (depending) if they rely mostly on that. If however, there mainly concerned about track noise, then yes, A turn up can really work. Assuming your somewhat familiar with sound, A radial stack (concentric rings) from the pipe exit will help to keep the sound waves contained within a fairly narrow sonic field. Again, not much use if there putting a DB meter right at the pipe exit, but on track real DB reaching the stands would be greatly diminished (unless the stands are located above and very close to the track).
04-23-2011 10:48 AM
tb1999
Quote:
Originally Posted by S0C0nFused View Post
"Without a turn down I was hitting 96db last year @ watkins glen"

So you need to kill ~15DB. How do they measure the sound? At the tailpipe (inspection time?) or while you on track? (on track then assumes the meter is at least 10 feet away, and 3 feet above ground level).

My thinking >> The issue is, at 7K+, what is putting you over the 86DB limit is mid and high freqs. If 'aimed' at a mic or DB meter, can push the sound energy way up from distance (+20DB). A 'turn down' does not help greatly as the energy simply fragments. A 'turn up' would be better as your using atmosphere as an 'infinite baffle' (ref: airport noise mitigation techniques).
Yes they take a reading in pits @ rec inspection to ballpark your db but still take readings when live on track. I can see what you mean about the turn down/up but never thought of it that way. Its sort of SOP to use a turndown. Ill have to try it the other way around next time

Quote:
Originally Posted by 02_silver_hatch View Post
is that a jag your using for a tow vehicle?
Yes Its an 03 S-TYPE. Which does a great job. About 18-19 MPG towing on the highway. THE 300BHP 4.2 L V8 has plenty of power and can easily hit speeds that would earn me a moving violation. Its such a comfortable ride on long trips I almost dread the day I upgrade to an SUV or pickup with full trailer. This will be my 3rd year hauling the Focus with my Jag.
04-21-2011 04:42 PM
02_silver_hatch is that a jag your using for a tow vehicle?
04-21-2011 01:46 PM
S0C0nFused "Without a turn down I was hitting 96db last year @ watkins glen"

So you need to kill ~15DB. How do they measure the sound? At the tailpipe (inspection time?) or while you on track? (on track then assumes the meter is at least 10 feet away, and 3 feet above ground level).

My thinking >> The issue is, at 7K+, what is putting you over the 86DB limit is mid and high freqs. If 'aimed' at a mic or DB meter, can push the sound energy way up from distance (+20DB). A 'turn down' does not help greatly as the energy simply fragments. A 'turn up' would be better as your using atmosphere as an 'infinite baffle' (ref: airport noise mitigation techniques).
04-19-2011 09:40 PM
tb1999
Quote:
Originally Posted by Buickboy View Post
wait... 84DB limit? thats awful! wheres the fun in that? lol

sounds like a lot of fun! whens the next event there? i might be able to come and check it out
I probably wont be back @ lime rock till later in the year. Chances are i'll be making posts before each of my events. Watch this space!



Posted via FF Mobile
04-19-2011 09:36 PM
tb1999
Quote:
Originally Posted by S0C0nFused View Post
"Finally I had to run out to an autoparts store and cobble up a muffler since I blew away the 84db sound limits @ LRP. Even with a turn down the Fofo blew a 89db while on track"

You blew it by how much, and starting at what RPM? Just thinking something like supertrapp muffler might work here.
Yes I wanted to run a supertrapp but did not have many options on a saturday afternoon in suburban CT. I'm basically shifting @ 8000 RPM +/- 100. With a 3" exhaust and dynomax flow thru muffler its not very quiet..... Without a turn down I was hitting 96db last year @ watkins glen.


Posted via FF Mobile
04-19-2011 03:13 PM
Buickboy wait... 84DB limit? thats awful! wheres the fun in that? lol

sounds like a lot of fun! whens the next event there? i might be able to come and check it out
04-19-2011 01:56 PM
S0C0nFused "Finally I had to run out to an autoparts store and cobble up a muffler since I blew away the 84db sound limits @ LRP. Even with a turn down the Fofo blew a 89db while on track"

You blew it by how much, and starting at what RPM? Just thinking something like supertrapp muffler might work here.
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