I ran some sound tests on the 05 WR450 exhaust
Posted February 14, 2005 - 03:59 PM
For those of you interested, I just got done running some crude sound measurements on my 05 WR450 exhaust.
Cold(35°F), damp, overcast, 15 mph breaze, open field (nearest building 75ft).
I used a calibrated B&K sound analyzer "mediator 2238"
This is not a cheap radio shack model, we are talking a $5k machine I borrowed from work .
As far as professional analyzers go it's still the bottom of the line .
All tests were performed per the SAE J1287 standard.
No insert, No SA, No tail cone/cover WIDE OPEN CAN = 100 to 100.5 Db
No insert, SA installed, tail cone/cover installed = 96.5 Db
No, insert, No SA, Just cap/cone installed = 97.8 Db
"modified insert", SA installed, tail cone/cover installed = 94 to 94.5 Db
This is a link to what my cone shaped "modified insert" looks like.
Posted February 14, 2005 - 04:58 PM
Posted February 14, 2005 - 05:08 PM
Myself, I'd leave the 03 pipe on and just work with the various insert around to get the performance you're looking for.
Posted February 14, 2005 - 10:28 PM
Sorry to hijack your thread, but can the 05 pipe fit on an 03 header? I hope this hasn't been covered too much.
From what all the aftermarket pipe makers show the 03-05 YZ/WR pipes and silencers all interchange.
Posted February 15, 2005 - 06:37 AM
Posted February 15, 2005 - 08:41 AM
Posted February 15, 2005 - 04:41 PM
I also have been running a KTM EXC muffler for the last four years to meet sound for races on 250F and 450F and the 05 exaust works much better and tone is lower than the Katoom exaust which was heavier but did the job and now I am so happy that Yammie finally put on Euro style exaust.
Db for KTM exaust was 94db by AMA standards and I'm certain the 05 will be under 96 easy.
Posted March 25, 2005 - 04:30 AM
Looking to do some more mods to the stock 05 pipe again. Similar to what basicblues is doing (by the way basicblues...keep up the good work), but I'm looking for a donor 05 stock insert. Not really in the mood to cut mine to pieces AGAIN. Anybody willing? I'll pay shipping plus a few bucks? Maybe one of you guys that's got the PMB already