ExUP valve

Jayy · Mr. Ponzi Joined: 08 Jun 2009 Karma :

Do I need the exup valve on my zx10r? Will there be any advantage to removing it?

Also, what about the cat in the exhaust and mid pipe? Will I get any gains by removing the cat and putting a different mid pipe on there?

Any help is appreciated as I keep reading conflicting things on Google.

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

buy a full system and map it. if it's anything like the 636 of the same age it's a noise regulations thing. the cat is obviously emissions.

obviously removing without remapping will cause a few flat spots, so get a PC3
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

TUG · World Chat Champion Joined: 12 May 2007 Karma :

Paulington · World Chat Champion Joined: 11 Mar 2009 Karma :

Replace the ENTIRE exhaust system including downpipes etc with a new system which removes the catalytic converter and EXUP valve, then take it to a professional motorcycle shop that has a dyno and makes custom maps, usually costs about £30 for a custom map I believe.

It will run MUCH better, this is exactly what has been done to my GSX-R1000, with the full Akrapovic race system it gained 8bhp at the rear wheel over stock. Thumbs Up

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Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Wafer_Thin_Ham · Super Spammer Joined: 18 Nov 2005 Karma :

Jayy · Mr. Ponzi Joined: 08 Jun 2009 Karma :

I'm not too fussed on a few extra HP, was just told it would improve the sound of the exhaust note by removing it. Would like it sounding meaner than it does and a slash cut / race fit type exhaust would help too Very Happy

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Suspect you will gain a few at the top end and lose a few in the mid range (probably giving you a flat spot in the mid range).

No doubt the valve does help with keeping the noise down at low and medium revs though.

All the best

Keith
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