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| Daytona675 Forum D675 Riders and Enthusiasts |
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07-27-2009, 08:24 PM
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#1 (permalink)
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New Member
Grand Prix 125 Favourite Bike: my 09 daytona
Join Date: Jun 2009
Location: frenchtown, new jersey
Posts: 25
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cat eliminator
is there anyone that make a cat eliminator for the daytona
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07-27-2009, 09:05 PM
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#2 (permalink)
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Official Leathers Tester
Site Supporter
Team Owner Favourite Bike: Very fast 675
Join Date: Jan 2002
Location: Seattle, WA
Posts: 5,420 Other Motorcycle: Very stationary Commando Extra Motorcycle: Mad Max the Husqvarna
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It's called a full exhaust system. The cat lives in the header, just ahead of the EXUP valve, if memory serves me right.
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Will
It's a squid thing. You wouldn't understand.
SponsorHouse profile
Go soothingly on the grease mud, as there lurks the skid demon.
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07-27-2009, 09:22 PM
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#3 (permalink)
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Senior Member
250 Grand Prix Favourite Bike: '07 Daytona 675
Join Date: Jun 2009
Location: Northeast, CT
Posts: 110 Other Motorcycle: Huffy Nevada, 10 spd
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Straight pipe, cut, weld, then complain about CEL's.
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I used to be apathetic, now I just don't care.
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07-27-2009, 11:59 PM
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#4 (permalink)
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Super Moderator
Site Supporter
SuperBike Favourite Bike: '06 675 Track Tool
Join Date: Jul 2004
Location: Bloomington, Indiana
Posts: 1,704 Other Motorcycle: '03 KTM 640 Adventure
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There are several options for you.
Full Exhaust
Cut the CAT open and gut it and then weld it back together
Cut out the CAT (and possibly the ExUp Valve as well) and weld in some straight pipe.
If you don't have a TuneBoy and you remove the ExUp, you will get a MIL Light as already mentioned above. You would either need the arrow tune loaded or you would need to diable the ExUp using TuneBoy or you would need a Race ECM and Race Harness installed.
If you have a street bike and are not having problems, why would you want to remove it? It would no longer be emissions compliant and you would reduce the resale value by messing with it.
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NESBA "A" #719
On the Road Less Traveled...
...You Always Meet More Interesting People
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07-28-2009, 04:57 PM
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#5 (permalink)
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Banned
Grand Prix 125 Favourite Bike: 2006 Daytona 675
Join Date: Feb 2008
Location: Topeka, Ks
Posts: 35 Other Motorcycle: 1999 Daytona 955i Extra Motorcycle: 1997 Daytona T595
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I have removed the CAT and Exup Valve on 4 675's, all with no problem at all. Getting a Tune into the bike that disregards the lack of Exup valve and that tunes for less backflow is ideal. I have done 3 of the bikes with aftermarket maps on a Tuneboy, but one of my own race bikes I put the Arrow tune in it with a modified stock header (no CAT, no Exup) and a Jardine RT-One CF Slipon. The bike ran fine and made good power.
So it IS possible to get the Arrow tune installed by your dealer (if they are willing) with a modified header and it be okay, but I have alternate maps available if you can get ahold of a Tuneboy setup.
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08-01-2009, 09:23 AM
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#6 (permalink)
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Senior Member
Pole Position Favourite Bike: 2012 Daytona 900
Join Date: Nov 2004
Location: Indiana, USA
Posts: 3,595 Other Motorcycle: 2008 Kawasaki ZX14
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At the risk of sounding dumb, does the full exhaust remove both CAT and EXUP?
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08-01-2009, 10:05 AM
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#7 (permalink)
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Super Moderator
Site Supporter
SuperBike Favourite Bike: '06 675 Track Tool
Join Date: Jul 2004
Location: Bloomington, Indiana
Posts: 1,704 Other Motorcycle: '03 KTM 640 Adventure
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Yes it does.
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NESBA "A" #719
On the Road Less Traveled...
...You Always Meet More Interesting People
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08-01-2009, 02:26 PM
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#8 (permalink)
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Senior Member
250 Grand Prix Favourite Bike: '07 Daytona 675
Join Date: Jun 2009
Location: Northeast, CT
Posts: 110 Other Motorcycle: Huffy Nevada, 10 spd
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At the risk of sounding dumb (sorry, had to borrow that line), whats the EXUP thing do?
If I search for it, it just comes up with the acronym. I'm guessing Yamaha didn't copyright that name.
__________________
I used to be apathetic, now I just don't care.
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08-01-2009, 02:28 PM
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#9 (permalink)
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Super Moderator
Site Supporter
SuperBike Favourite Bike: '06 675 Track Tool
Join Date: Jul 2004
Location: Bloomington, Indiana
Posts: 1,704 Other Motorcycle: '03 KTM 640 Adventure
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The ExUp valve is designed to increase back pressure in the exhaust system at low rpms, which is supposed to improve torque. In addition, it quiets the exhaust a bit at lower rpms.
__________________
NESBA "A" #719
On the Road Less Traveled...
...You Always Meet More Interesting People
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08-01-2009, 09:37 PM
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#10 (permalink)
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Senior Member
Pole Position Favourite Bike: 2012 Daytona 900
Join Date: Nov 2004
Location: Indiana, USA
Posts: 3,595 Other Motorcycle: 2008 Kawasaki ZX14
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So, does removing the EXUP valve reduce torque output while increasing top end surge?
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