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| xb12 exhaust on an xb9 https://ukbeg.com/forum/viewtopic.php?f=8&t=13526 |
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| Author: | BelperOwl [ 03 Feb 2012 21:50 ] |
| Post subject: | xb12 exhaust on an xb9 |
Can an xb12 standard exhaust with the valve be made to fit an xb9? Mates cans just disintegrated on his 9 and I have the original of my 12 in the garage. Thanks |
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| Author: | albert666 [ 03 Feb 2012 21:54 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
so long as its of the same vintage |
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| Author: | BelperOwl [ 03 Feb 2012 22:02 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
Yes both 07 pre modded heads. Advised him to take a look at your site for long term term solution, or get Tubbs to work his magic on my std one. Thanks |
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| Author: | sportster_mann [ 04 Feb 2012 13:43 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
It will fit, you just won't be able to use the active exhaust valve (or whatever they call it !) as the XB9 doesn't have the wiring for it - you can either leave the valve shut, or wire it open (or any combination in between). |
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| Author: | pash [ 04 Feb 2012 13:47 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
XB9 has the connector for it but not the sub harness, nor the motor nor mechanical cable. ECM on an 07 XB9 will be an IB310 which is capable. I helped a guy on here get the valve working on an XB9 previously and more recently Gunter has done it on his. Tezza has a manual cable to operate his... viewtopic.php?f=8&t=349 |
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| Author: | gunter [ 04 Feb 2012 15:00 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
With the valve closed, both cans are about identical. The only difference seems to be that two tubes inside swapped their positions, but are of the same length. We tried several setups, this one seems to work best: Attachment:
File comment: valve setup
exhaust.jpg [ 107.53 KiB | Viewed 637 times ] |
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| Author: | Matt James [ 04 Feb 2012 17:03 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
Excuse me for jumping in with a question .. what does this valve actually do ? No after market pipe seems to have one so is it better to mod a standard pipe and keep the valve or go for a new pipe without one ? |
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| Author: | gunter [ 04 Feb 2012 22:23 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
the valve opens an expansion chamber to adjust the header length for low and high rpms:  (picture is exaggerative).  This picture implies that gas flow is using a shorter path with the valve opened, which is bullshit of course, simply because of the mass inertia of the flowing gas. But pressure waves will run into the chamber, and that makes the difference. Third party mufflers with untuned header commonly show a typical dip in torque, similar to that shown below: http://www.johnsonenginetechnology.com/ ... perspt.jpg |
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| Author: | Matt James [ 06 Feb 2012 18:22 ] |
| Post subject: | Re: xb12 exhaust on an xb9 |
Thanks - I kind of like the torque .. not sure I want to lose it  But not keen on the weight, sound or the fact standard can looks prone to rusting out either ... |
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