The link I posted shows the effect of the valve on performance (according to Erik) – there is an interesting patent to read too. Although the valve could be seen as a noise emission abatement, is that the cause or effect? The cynics would say “cause”, the believers would say “effect”.

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08 Specialized Langster

And people wonder why I don't bother posting on here much any more?

ALL Buell and Harley motorcycles (and pretty much most others) are set up very lean at the factory in order to get through ever tightening emmissions laws. Even in stock form most will benefit from some kind of fuelling device or remapping in order to get an AF value that actually allows the engine to work as intended.

If you fit a free flowing exhaust then you will definitely need to do something, as it will be extremely lean. Some exhaust manufacturers will tell you than retuning isn't necessary, but they are usually wrong.

The Free Spirits Reverso/404 and RS402 headers are without doubt one of the very best exhausts for the XB in terms of mid range and top end performance gains (in a dyno test by Hal's HD they came out above every other road legal system available), so it stands to reason that some tuning will be needed.

The 08 bikes are very restricted in stock form by the narrow header pipes and catalyst, so if you fit a decent set of headers and a pipe it is pretty much certain that you will have to do something. As the choice for tuning the 08 bikes is quite limited it leaves just the TFi (or Kitech or other rebadged TFi unit) and the Powerizer really. Power Commander don't make a unit to fit the Buell, and to be honest they never worked well on the old X1's when they were available (although the new PC-V works fine on Sportsters).

I tell everyone that buys an exhaust from us exactly the same, but I don't try to push a tuner on them if they don't want it. I will usually say that they should try it without and see how it goes, as they can always add the tuner later.

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"Racing is life. Everything before and after is just waiting".

Thanks Trojan for confirming that. For my 2009 Buell it's the Free Spirits Tfi or the Powerizer that you sell. Just to clarify what perhaps I've already been told - the Free Spirits should work better with my Free Spirits exhaust as apposed to using the powerizer but for best results = dyno as well?

Is there anything that can address front and rear independently?

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08 Specialized Langster

Both should work very well woth your 09 bike, although the base map for the Free Spirits TFi was set by them using this exhaust, so it should be very close to what you need straight from the box. Minor tuning can be done with the buttons on the top of the unit. Personally I would tend to get it set on a dyno rather than by 'seat of the pants', but even if you get it wrong it can't take fuel away so you shouldn't do any damage. You can always revert to the base map and start again.


Nothing that is available yet as far as I am aware. Power Commander have never done a PC for the XB range and don't look as if they are going to any time soon, so the choice of user adjustable units for later model bikes is very thin.

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"Racing is life. Everything before and after is just waiting".

Could it be suggested to FS that there is a need for an independent front and rear is needed, especially with different header lengths.

I guess the alternative is to buy two units and wire one to the front and one to the rear injectors.

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08 Specialized Langster

To ph4824 just to let you know mate i have a 08 xb9sx, im running a piper x air filter with the crank case breather mod, a remus exhuast with out the baffles and a remus poweriser to work along with all of the above mentioned. Sinse fitting the poweriser i have noticed a massive difference and my bike not only sounds better but goes like shit off a shovel, it also sorted out my fuelling. So there is hope! Just wanna thank trojan for supplying the parts.

The basic TFi unit is supplied to people such as Free Spirits/Kitech etc for them to map. I don't think there is sufficient flexibility in the system to map separate cylinders, although I'm sure somebody much cleverer than me could make two units work in tandem. For 'normal' road use though the basic TFi and Powerizer units will suit most customers just wanting an exhaust and filter change.



Thanks Steve

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"Racing is life. Everything before and after is just waiting".

#

Thanks Steve G just what I needed - someone who's gone there before me with the same bike - cheers Just out of interest what was your bike like before you added the Powerizer?

Well suprisingly it wasnt bad at all, i only bought the poweriser because i changed the air filter and had the breather mod done, because of that it was sucking twice the ammount more air in and there wasnt enough fuel going through so after a period of time i would have cooked the engine. Before i fitted any aftermarket replacements ie, air filter, exhuast, breather mod, poweriser the bike ran fine, was relatively pokey but a bit flat in mid to top range, after doing all this i got a better mid range, more grunt in the higher gears but it never changed the top end speed. And now it screams, has a totally different sound to the exhaust (better). All in all mate it was well worth the 200 notes. I wouldnt listen too much to what some people have to say on this forum because the majority just take the piss so i wouldnt take it to heart

Does 'not mine' mean a tubbs mod can doesn't give mid range problems or it doesn't have a flap?

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There's only one way of life

Both.

The flap is welded in position and I had no mid range problems at all - but then both my Firebolts were 9s, although I had a 12 Tubbs modified exhaust fitted.

At the mo I'm still looking for a 1125R exhaust for Tubbs to modify as I really did like his XB exhaust that much - it was certainly much better than either the Buell standard or race exhausts.

thank you for that sir...........................................where do i send the tenner

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Do you want it right or right now ?

Do you not already have my address?

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Good in straight lines
2001 X1 "The Tart's Handbag"
2001 FZS1000 "The Fridge"

To be fair, the flatness described is annoying cause it's my bike but it's not a masive problem. Your description of your bike before the mods were the same as my bike. Seems a tfi unit is next on my shopping list!

Cheers
Paul



Point taken