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DB Killers and performance.

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hazza
World Chat Champion



Joined: 28 Sep 2005
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PostPosted: 06:54 - 12 Aug 2011    Post subject: DB Killers and performance. Reply with quote
Do DB killers affect performance? The reason i ask is that before last night id only ever rode my bandit 6 without one in. Whilst its still plenty fast with it in, it feels just that less.......scary. Bear in mind its the first 'Big' bike I've owned but without the DB killer the power delivery seems much more frenzied. Perhaps the noise added to the theatre of it? Either way i felt comfortable cracking the Ton (albeit only briefly on acceleration) with the DB killer as it seems so much smoother.

Ta

Harry
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)
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DrDonnyBrago
World Chat Champion



Joined: 03 Jan 2010
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PostPosted: 07:35 - 12 Aug 2011    Post subject: Re: DB Killers and performance. Reply with quote
hazza wrote:
Do DB killers affect performance? The reason i ask is that before last night id only ever rode my bandit 6 without one in. Whilst its still plenty fast with it in, it feels just that less.......scary. Bear in mind its the first 'Big' bike I've owned but without the DB killer the power delivery seems much more frenzied. Perhaps the noise added to the theatre of it? Either way i felt comfortable cracking the Ton (albeit only briefly on acceleration) with the DB killer as it seems so much smoother.

Ta

Harry



It slightly changes the way gases pass through your engine so it "could" have an effect on power delivery, that said it is probably just a psychological effect because of the extra noise.


I tend to ride faster with the baffle in because I feel like I am drawing less attention to myself.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 08:19 - 12 Aug 2011    Post subject: Reply with quote
Hi

Will depend on the pipe.

Marjay found a massive difference with his Triumph Daytona with the baffle in / out. On my played with 1200 it made 5% difference (and the bike is set up for the baffle out).

With the Bandit the extra 5% isn't anything you would notice. What you do notice is it being far more lethargic at low revs when cold and noticeably pulling less smoothly below about 5k.

All the best

Keith
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hazza
World Chat Champion



Joined: 28 Sep 2005
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PostPosted: 08:24 - 12 Aug 2011    Post subject: Reply with quote
Hi,

Its an Akrapovic and sounds fantastic without it!not sure the neighbours would agree at 7 am though
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 08:33 - 12 Aug 2011    Post subject: Reply with quote
hazza wrote:
Hi,

Its an Akrapovic and sounds fantastic without it!not sure the neighbours would agree at 7 am though


Screw the neighbours Laughing I woke them up with the bike and car almost everyday at 7.30 Twisted Evil
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neatbik
World Chat Champion



Joined: 27 Jun 2007
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PostPosted: 09:08 - 12 Aug 2011    Post subject: Reply with quote
On my Speed 4 i noticed no difference at all, although it was a cheap g-force can.

With my f650 there is a huge difference. With it out the power delivery is a lot snappier, so much so it made it harder when i greenlaning in the mud. Its also a hell of a lot louder, obviously.
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hazza
World Chat Champion



Joined: 28 Sep 2005
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PostPosted: 09:16 - 12 Aug 2011    Post subject: Reply with quote
Quote:
With it out the power delivery is a lot snappier, so much so it made it harder when i greenlaning in the mud. Its also a hell of a lot louder, obviously.


Yeah this is exactly what i get. the power just seems to come from nowhere whereas with the DB its a gentle progression.


Its not amazingly loud without it, but it is pretty throaty and certainly loud enough to get noticed, especially the popping on deceleration.
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3 Honda NC50's(Sold)-->'72 Puch Maxi S (Sold, want it back!)--> '90 Yamaha RXS 100 (Stolen)--> '87 Honda Cub 90(Sold) --> '95 Kawasaki Eliminator (Sold) --> '98 Bandit 600 (Sold) -->'07 SV650S (Current)
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 09:57 - 12 Aug 2011    Post subject: Reply with quote
Kickstart wrote:
Hi

Will depend on the pipe.

Marjay found a massive difference with his Triumph Daytona with the baffle in / out. On my played with 1200 it made 5% difference (and the bike is set up for the baffle out).

With the Bandit the extra 5% isn't anything you would notice. What you do notice is it being far more lethargic at low revs when cold and noticeably pulling less smoothly below about 5k.

All the best

Keith


I had two baffles in my Daytona, a road legal stamped one and a triangular 'Db killer' in the other end. When I had them in the bike was dynoed at 80bhp, with them out it made 115bhp.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 10:15 - 12 Aug 2011    Post subject: Reply with quote
MarJay wrote:
I had two baffles in my Daytona, a road legal stamped one and a triangular 'Db killer' in the other end. When I had them in the bike was dynoed at 80bhp, with them out it made 115bhp.


Christ Laughing Thats some MAJOR effect.
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