posted July 11, 2002 06:07 PM
Exhaust questions but not the usual "Which one should I buy" I don't even have a ZX12R but only an old ZX11 but I regularly sneak around here. In another life, I cold try to get someday a ZZR1200. I know the ZZR1200 have catalyzers built into the stock exhaust system, like the ZX12R. My questions are to try to estimate what could be the possible HP gain when a full exhaust or slip-ons will be installed on a ZZR1200. I know many of you dynoed their bike before and after exhaust installation and here are the q's:
1) What is the typical HP gain after installing a complete system from the popular systems like Akrapovic, Yoshimura, Muzzy and Hindle?
2) What is the typical HP gain after installing a slip-on and with the catalyzer still in place?
3) What is the typical HP gain after installing a slip-on after catalyzer have been removed?
Thanks a lot for any infos!
posted July 12, 2002 03:58 AM
I probably did not explained myself correctly. All the questions above are for you guys that have ZX12R (not ZZR1200) and installed and dynoed their bikes. I would like to know, on a ZX12R, what were the HP gains. From your results, I want to look at what are the HP results of having or not having a catalyzer. Sorry for the misunderstanding. I'm sure most of you could tell me those numbers from memory. Thanks again.
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posted July 12, 2002 06:44 AM
Hey Claude -
The HP gain from removing the catalytic converter is minimal, if measureable at all. I don't know of anyone that's measured any HP gain with it removed. What it does do is give the bike a richer, fuller sound. Here's a quick guide:
Stock exhaust - roughly 162 hp
Minus cat - same, better sound, less heat
Slipon exh - six to eight hp gain
Full exhaust - 12 to fifteen hp
Best numbers I've personally seen on a stock motored zx12r with full muzzy, PC IIIr, K&N filters, clean air block off plates is 181.5 hp.
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
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posted July 12, 2002 06:45 AM
And for anyone wondering what kinda gains would be there for a ZZR, I would imagine they would be less, seeing that it starts life with a dual exh, as previously stated.
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted July 12, 2002 07:17 AM
Thanks swft, that's the numbers I was looking for. I'm surprised to see no gain by guttering the catalyzer though. Anybody dynoed before and after catalyzer but with slip-on instead of stock canister?
posted July 12, 2002 07:19 AM
My increases are not exactly known as I didn't have the stock numbers but after putting a full Yosh system, modified air filters, timing advancer and TPS adjustment with NO PCIII, I have 172.6hp at the rear. I'm sure if I would get off my ass and get a PC I could squeeze out several more.
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posted July 11, 2002 06:07 PM
