Rieju & GasGas Legacy Riders Club Forum  

Go Back   Rieju & GasGas Legacy Riders Club Forum > GasGas Enduro Technical Forums > Enduro Product Announcements

Enduro Product Announcements Announce new gasgas enduro products here - Vendors Welcome...


Reply
 
Thread Tools Display Modes
  #21  
Old 03-31-2009, 09:07 PM
AZRickD AZRickD is offline
Senior Member
 
Join Date: Feb 2007
Posts: 1,838
Default

I was in the shop (monkeybuttparts.com) when the FMF arrived for F_G's bike.

It looked like a 4T can, only smaller. Maybe mid way between.

A 6 dB drop in sound pressure is significant. A 3dB drop is half. Another 3dB is half again (is that how that works? ).

The only think I'll hear when F_G rolls up is chain noise.


Reply With Quote


  #22  
Old 03-31-2009, 09:59 PM
PEB PEB is offline
Senior Member
 
Join Date: Aug 2006
Posts: 1,152
Default

I am pretty sure that the sound level would drop by 6dbm. DB is used several different ways. As a measurement (dbm)like on the FMF pipe or in other cases where as you mentioned a 3db reduction is half. It would be quite a feat if FMF made a pipe that muffled the sound by 75%
Reply With Quote
  #23  
Old 04-01-2009, 06:35 AM
SideshowBob SideshowBob is offline
Senior Member
 
Join Date: Mar 2009
Location: Smalbany, NY
Posts: 471
Default

Quote:
Originally Posted by F_G View Post
My buddy has an '05 DE250, I can certainly check and see if it will fit or see what might need to be done to make it fit.
That would be great, but no rush.
Reply With Quote
  #24  
Old 04-01-2009, 06:48 AM
iancp5's Avatar
iancp5 iancp5 is offline
Senior Member
 
Join Date: Aug 2006
Location: U.K.
Posts: 829
Default

Quote:
Originally Posted by AZRickD View Post
The only think I'll hear when F_G rolls up is chain noise.
Don't worry no matter how good the can is there'll be plenty of noise coming out of the front pipe walls. Still a welcome drop as it should be very quiet at a distance. It's just that close up you get a lot of noise through metal. It always surprised me how quiet my 300 was from just 20 yards while sat on it was a different story.
Reply With Quote
  #25  
Old 04-01-2009, 09:59 AM
F_G F_G is offline
Senior Member
 
Join Date: Feb 2009
Location: Peoria, Az
Posts: 120
Default

Actual sound and perceived noise are definitely two different animals. I rode the bike down the street and my son said when I was 3 houses away he could no longer hear the exhaust just the chain slap. So it cuts db in the J1287 test (not a real good representation in my opinion, but at the moment it's the only repeatable test standard we have) plus it minimizes perceived noise which is much more important to me. In my opinion well worth the money.
Reply With Quote
  #26  
Old 04-01-2009, 11:31 AM
Skidad's Avatar
Skidad Skidad is offline
Senior Member
 
Join Date: Dec 2007
Location: Littleton Massachusetts
Posts: 1,209
Default

At some point I'll coat the back of my carbon fiber pipe guard (or actually right on the pipe itself where the guard rests which would stop corrosion/rust) with a high temp rubber coating. I believe this would quiet down some of the pipe bang noise. Need to do a little research first into coatings but that shouldn't be to difficult.

I've also got some ideas about the really irritating chain slap noise as well to work on. That really bugs me. We will see.......
__________________
07 EC 300 (under 500 miles, selling soon)
97 KTM 250 EXC (sold)
2016 Trek Remedy 29er
Reply With Quote
  #27  
Old 04-01-2009, 12:12 PM
F_G F_G is offline
Senior Member
 
Join Date: Feb 2009
Location: Peoria, Az
Posts: 120
Default

Quote:
Originally Posted by Skidad View Post
At some point I'll coat the back of my carbon fiber pipe guard (or actually right on the pipe itself where the guard rests which would stop corrosion/rust) with a high temp rubber coating. I believe this would quiet down some of the pipe bang noise. Need to do a little research first into coatings but that shouldn't be to difficult.
I thought about trying the poly urethane they use for truck beds, just not to sure how heat resistant it is.

Quote:
I've also got some ideas about the really irritating chain slap noise as well to work on. That really bugs me. We will see.......
I put a strip of neoprene under the chain guide on top of the swingarm on my KTM and it quieted it down considerably.
Reply With Quote
  #28  
Old 04-01-2009, 01:17 PM
rpduc rpduc is offline
Senior Member
 
Join Date: Feb 2008
Location: Minnesota
Posts: 419
Default

Wow 85+ dB. That's what I like to hear. Or not hear...

The last time my MC was checked it was about 92dB so I guess I could expect a similar reduction. Thanks for the report F_G.

Now how about fitment on that "old" DE 250?

I have grinders and welder to make it fit my '05 MC but it would be great if it fit right up.
__________________
Ross
'05 MC 250
'91 Husky 610wxe
'04 Duc M800 R.I.P
'06 Duc S2r 1000 R.I.P
'07 Duc S2r 1000 still rubber side down...
----------------------------------------------------------
May be so... May be not so...

My Website
Reply With Quote
  #29  
Old 04-01-2009, 02:56 PM
F_G F_G is offline
Senior Member
 
Join Date: Feb 2009
Location: Peoria, Az
Posts: 120
Default

As soon as I can get my 300 in close proximity to his 250 I'll let you know.
Reply With Quote
  #30  
Old 04-07-2009, 10:07 AM
F_G F_G is offline
Senior Member
 
Join Date: Feb 2009
Location: Peoria, Az
Posts: 120
Default

Q Stealth ride report.

-Very quiet

-Had to actually rev it a few times on some rocky descents to see if it was still running

-Didn't notice any power loss using my very sensitive butt-dynometer

-Had many people comment on how quiet it was

-I like it
Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Any update on the 300 e-starts? rgranger General Discussions & Announcements 10 11-08-2010 08:14 PM
FMF Q Stealth roostafish Enduro Product Reviews 6 07-09-2010 12:57 AM
EC300 FMF Q-Stealth Elvis74 Enduro Engine - 2 stroke 9 04-26-2010 05:05 AM
New Stealth FMF Silencer Skidad General Discussions & Announcements 6 02-26-2008 01:28 PM




All times are GMT -5. The time now is 07:18 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org