With the noise level test coming to Colorado in the future I was wondering if a Summit XP 800 with an HPS can will pass the noise test. Has anyone had their XP/HPS noise tested? Just looking for a little info prior to spending any $. Thanks.
Does an XP w/HPS pass noise level test?
- Thread starter Pell
- Start date
From what I've seen they do. The reason being that the 800R motors have pipes with baffles in them. The HPS cans on older 800 motors are much louder.
That's what I was looking for. Didn't want to buy one and then have it fail the noise test. Thanks for the info.
I borrowed a pretty good DB meter from work and whipped it out in MC lot. Wonderbread had his rev with, I think an HPS can? a straight through little thing anyway, and it hung around 88, but blipped to 89 db. My sled with BMP pipe/can was around 89. Stock M8 was 86. Turbo dragon around 88-89 db. Lot was hardpack but had a few inches of loose snow on it.
I'll have it with me if anyone wants to check their sled up there sometime. Not a straight equivalent of their test, but gives a general idea. From what I saw, the modded exhausts were borderline on my meter... Need to test in varying snow conditions just to see how much difference there is between hardpack and say, 6" of fluff.
XP's are acceptable with that can at low R's....until they wind up. I've ridden with you PJ and that sled is as loud a single setup as any other sled running a can with that tiny volume. No offense, I don't mind loud (I run jaws with a juice can sometimes), but when they wind up, that little HPS can is very LOUD. Don't fool yourself about how much noise your putting out there at WFO. Need to do some WO tests sometime and see what those numbers look like. Their 4000 rpm test seems kind of stupid to me, since it really doesn't tell you much about wide open sound levels and that's what pizzes people off, not puttering along at engagement R's. The fact an HPS can passes is proof to me the test is useless. That said, I don't claim to be a sound Nazi or anything, just saying, don't get all puffed up like your Ghandi and saving the sport because your can passes that flawed test.
I'll have it with me if anyone wants to check their sled up there sometime. Not a straight equivalent of their test, but gives a general idea. From what I saw, the modded exhausts were borderline on my meter... Need to test in varying snow conditions just to see how much difference there is between hardpack and say, 6" of fluff.
XP's are acceptable with that can at low R's....until they wind up. I've ridden with you PJ and that sled is as loud a single setup as any other sled running a can with that tiny volume. No offense, I don't mind loud (I run jaws with a juice can sometimes), but when they wind up, that little HPS can is very LOUD. Don't fool yourself about how much noise your putting out there at WFO. Need to do some WO tests sometime and see what those numbers look like. Their 4000 rpm test seems kind of stupid to me, since it really doesn't tell you much about wide open sound levels and that's what pizzes people off, not puttering along at engagement R's. The fact an HPS can passes is proof to me the test is useless. That said, I don't claim to be a sound Nazi or anything, just saying, don't get all puffed up like your Ghandi and saving the sport because your can passes that flawed test.
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I know that thing screams after 6500rpm. At 4000 it's where it needs to be. But compared to a JAWS can, the HPS is stealth.
Besides, there isn't a single can or sled out there that will stay at 88db at WOT. But it is a flawed test and the variables are too inconsistent to support a citation. I didn't put my HPS on for the sound, but rather the weight savings and performance improvement that I received. Yes, I did get an improvement.
Besides, there isn't a single can or sled out there that will stay at 88db at WOT. But it is a flawed test and the variables are too inconsistent to support a citation. I didn't put my HPS on for the sound, but rather the weight savings and performance improvement that I received. Yes, I did get an improvement.
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What improvements are you referring to? Yes, it possibly gives you 1-2 hp (maybe) and about 10 lbs of weight loss, nothing to brag about though. I have an HPS can on the XP and at times it can be obnoxiously loud. At least it sounds better than stock imo.
B
BackCountryBob
Well-known member
MY 04 REV with SLP was clocked at 91 dB at 4,000 rpm on an icy surface. I need to retest on SNOW and remove my belt 'cause my engagement is 3,600. I think pushing the belt put a good load on the engine and makes it louder.
I rode all day long with the Colorado State trails guys and they thought my sled would be OK. And BTW, those guys can ride
BCB
I rode all day long with the Colorado State trails guys and they thought my sled would be OK. And BTW, those guys can ride
BCB
We can't explain it. Running the stock exhaust on the same motor yielded less, oomph, shall we say. But after installing the HPS can (and the motor setup was the exact same setup, nothing changed) the "oomph" increased. I started hitting the rev limiter in deep snow condition and even clicking down wasn't stopping it. I called my dealer and asked him about it and he sent me weights and told me to keep adding weight until I was hitting 8200 in the #3 position. When I called and told him what size pin weights I had in there he was floored. Mule and XC700166 can attest to how my sled runs. It's weird.
C
colorado yamaha
Member
How To Test
Here is some helpful information:
SNOWMOBILE MEASUREMENT STANDARDS
STATIONARY PROCEDURE- SAE J2567
ANNOYANCE ISSUE -
• EXHAUST NOISE FROM SNOWMOBILES IS THE NUMBER 1 NOISE SOURCE
• SOME SNOWMOBILES DO NOT HAVE “EFFECTIVE” EXHAUST MUFFLING
Colorado REQUIRES “Maintained” MUFFLERS ON EVERY SNOWMOBILE
• THERE ARE NO "VISUAL" MEANS FOR EVALUATING “EFFECTIVE” MUFFLER SYSTEMS, SO THE ONLY VIABLE SOLUTION IS TO MEASURE EXHAUST NOISE
• THE STATIONARY TEST APPLIES TO ALL SNOWMOBILES
• SNOWMOBILE EXHAUSTS CANNOT BE REPACKED
• THE CO STATIONARY SOUND LEVEL LIMIT FOR SNOWMOBILES IS 88 dBA AT 4000 rpm.
TEST SITES and CONDITIONS-
GENERAL GUIDELINES
AVOID TEST SITES ADJACENT TO LARGE REFLECTIVE SURFACES FOR THE SNOWMOBILE TEST PROCEDURE
AMBIENT (BACKGROUND) SOUND LEVEL MUST BE AT LEAST 10 dB LOWER THAN THE MEASURED SOUND LEVEL(S)
TALKING IS FORBIDDEN DURING SOUND LEVEL MEASUREMENTS
ALWAYS OBSERVE THE 10 dB RULE!
DO NOT IMPROVISE OR MODIFY ANY TEST STANDARD
TEST PROCEDURE FOR MEASUREMENT OF STATIONARY SNOWMOBILE NOISE
Equipment needs: Sound Meter, Calibrator, Tachometer, Tape Measure, Tripod
Pretest
Test site is either grass or snow.
Clear personnel from the test site for at least a 16 feet radius from
the center of the machine.
Ensure no trees buildings, signs, etc. are within a 16 feet radius of
the machine.
Calibrate the sound meter to within 0.1 dB.
The meter shall be set for slow response on the A scale.
Record the ambient noise level.
Ambient sound should be at least 10 dB lower than sound level of
tested machines.
Advisement: Winds should be no more than 12 mph and area should
be snow covered. Avoid areas of bare ice.
Operator sits on seat, feet on the footrests. All other personnel
shall stand behind the technician.
Ensure snowmobile is warmed up.
Attach RPM meter or use machine’s RPM meter.
Measure 157.5 inches from the centerline of the machine to a spot
on the exhaust side. The meter must be on the same side as the
exhaust outlet.
Place sound meter (center of microphone) on tripod at 157.5 inch
mark on exhaust side
Raise microphone (center) to 48 inches above (ground) surface
Operator should be advised to nod his/her head when the proper
engine RPM speed is reached and maintained.
The operator should be advised to hold the RPM speed for at least 4
seconds.
Conducting the test
Operator gradually increases RPM until 4,000 RPM ±250 is achieved.
Maintain RPM speed for at least 4 seconds.
Technician reads the meter and records the 4 second average.
The test is repeated, the two results must be within 2 decibels of
each other, if not repeat.
The two tests are averaged (Test 1 + Test 2, divided by 2 = Final
Result).
Averaged results above regulated limit, fail.
Record post-test ambient noise level.
Recalibrate the sound meter.
Here is some helpful information:
SNOWMOBILE MEASUREMENT STANDARDS
STATIONARY PROCEDURE- SAE J2567
ANNOYANCE ISSUE -
• EXHAUST NOISE FROM SNOWMOBILES IS THE NUMBER 1 NOISE SOURCE
• SOME SNOWMOBILES DO NOT HAVE “EFFECTIVE” EXHAUST MUFFLING
Colorado REQUIRES “Maintained” MUFFLERS ON EVERY SNOWMOBILE
• THERE ARE NO "VISUAL" MEANS FOR EVALUATING “EFFECTIVE” MUFFLER SYSTEMS, SO THE ONLY VIABLE SOLUTION IS TO MEASURE EXHAUST NOISE
• THE STATIONARY TEST APPLIES TO ALL SNOWMOBILES
• SNOWMOBILE EXHAUSTS CANNOT BE REPACKED
• THE CO STATIONARY SOUND LEVEL LIMIT FOR SNOWMOBILES IS 88 dBA AT 4000 rpm.
TEST SITES and CONDITIONS-
GENERAL GUIDELINES
AVOID TEST SITES ADJACENT TO LARGE REFLECTIVE SURFACES FOR THE SNOWMOBILE TEST PROCEDURE
AMBIENT (BACKGROUND) SOUND LEVEL MUST BE AT LEAST 10 dB LOWER THAN THE MEASURED SOUND LEVEL(S)
TALKING IS FORBIDDEN DURING SOUND LEVEL MEASUREMENTS
ALWAYS OBSERVE THE 10 dB RULE!
DO NOT IMPROVISE OR MODIFY ANY TEST STANDARD
TEST PROCEDURE FOR MEASUREMENT OF STATIONARY SNOWMOBILE NOISE
Equipment needs: Sound Meter, Calibrator, Tachometer, Tape Measure, Tripod
Pretest
Test site is either grass or snow.
Clear personnel from the test site for at least a 16 feet radius from
the center of the machine.
Ensure no trees buildings, signs, etc. are within a 16 feet radius of
the machine.
Calibrate the sound meter to within 0.1 dB.
The meter shall be set for slow response on the A scale.
Record the ambient noise level.
Ambient sound should be at least 10 dB lower than sound level of
tested machines.
Advisement: Winds should be no more than 12 mph and area should
be snow covered. Avoid areas of bare ice.
Operator sits on seat, feet on the footrests. All other personnel
shall stand behind the technician.
Ensure snowmobile is warmed up.
Attach RPM meter or use machine’s RPM meter.
Measure 157.5 inches from the centerline of the machine to a spot
on the exhaust side. The meter must be on the same side as the
exhaust outlet.
Place sound meter (center of microphone) on tripod at 157.5 inch
mark on exhaust side
Raise microphone (center) to 48 inches above (ground) surface
Operator should be advised to nod his/her head when the proper
engine RPM speed is reached and maintained.
The operator should be advised to hold the RPM speed for at least 4
seconds.
Conducting the test
Operator gradually increases RPM until 4,000 RPM ±250 is achieved.
Maintain RPM speed for at least 4 seconds.
Technician reads the meter and records the 4 second average.
The test is repeated, the two results must be within 2 decibels of
each other, if not repeat.
The two tests are averaged (Test 1 + Test 2, divided by 2 = Final
Result).
Averaged results above regulated limit, fail.
Record post-test ambient noise level.
Recalibrate the sound meter.
I have an MBRP can and last year at the 4m ride it was tested at 90 db but Bushy tested it with the hand held meter at Muddy Creek lot and he got 88 so it all depend on distance, snow conditions and whatever else? I don't know will have to wait and see?
