Thruxton V&H Slip ons - US spec

Yes, questionable (but they aren't loud), removable baffle is the difference, and yes (suggest doing it before fitment such that you can poke the baffle out from the header end) and yes a little cheaper

 

Got mine from team Roberts. Got a reflash to do in spring

 

I got us spec and there wasn't a lot of difference until I put the x pipe on now it sounds how it should do

 

yes i was told so. ive knocked the baffle out as well and it sounds good, however not illegally loud.

 

Bearing in mind people are fitting X Pipes with no reflash (and that's surely a fair bigger change) I don't believe a reflash is required with the silencer change......happy to be proved wrong but mine was running fine and dandy without

 

Just going on what team Roberts said. I have to go back for the fuel tank recall anyway

 

Got US spec versions on mine, no remap required. Baffles out and sounds fantastic especially in sport mode "oh yes!"

 

So just to clarify, the UK +US V&H pipes are identical apart from the baffle being removable?

 

There is a massive baffle half way down the uk pipe the us spec like mine has a little removable one and the end of the can

 

i'm awaiting spring, mine will get the tank recall and then thrashed. V+H open pipes, no baffles, and removed the resonator thingy ma bob

 

Just so you all know, Triumph have not done a tune for anything other than the stock exhaust set up, their is no re-flash other than an updated tune that Triumph did last summer. Harley Davidson were taken to court in the USA over non stock emissions tunes using their Super Tuner and fined $12 million. For this reason Triumph shelved the cam and race exhaust system that they were doing for the Thruxton....No major manufacturer will be doing tunes/maps that don't conform to EU/US emissions and noise standards...there is a lot of BS out there about re-flashes that don't exist, so beware of being ripped off..
As it stands the only way to retune to suit full intake and exhaust modifications is to us a power Commander.

Opening up the intake, fitting an X-pipe or straight through headers and open silencers should really be done with a Power Commander and tuned to suit the changes.
Whether it is safe to fit the X-pipe or de-cat headers and open silencers is debatable, but combined with a free flowing air filter also, I dont think it would be a good thing long term for the motor....

 

Some interesting dyno results here http://www.triumphrat.net/club-cafe...tios-performance-definitive-test-results.html suggesting major change to exhaust is possible without a need for a PC.

 

Hi jeznewsome,

....many thanks for sharing the Dyno testing link.

Looks like the best 'bang for buck' exhaust system change is to fit the de-cat 'bag pipe' and leave the silencers stock.....I've seen the decat 'bag pipe' selling for about £200 on 'the man cave' You Tube site........a lot cheaper than fitting V & H's.

Now, I've just got to squirrel away my pocket money so Mrs dickydido's 'spending alert radar' does not kick in!!!

Cheers,

dickydido

 

good article, thanks for posting

 

I'm very suspicious of that chart....below is the full chart (not shown on the RAT forum as far as I'm aware) showing the HP and TQ figures, (79hp and 72ft/lb). He started with a low peak HP and TQ figure compared to other stock Thruxton dyno charts and ended with the same figures as other stock runs (87hp 76ft/lb)....Keep in mind the TQ figure on that chart is in NM which is why it shows a large TQ gain when it actually only 4ft/lb and you can see that sort of difference on the same bike on the same day over four or five dyno runs...This guy is helping sell a product and from years of experience with internet dyno charts that are selling products I have seen lots of them not live up to the hype in the real world.
Also you have to ask yourself why if open pipes were OK with the stock tune why would Triumph shelve the open headers they actually went ahead and manufactures but decided not to release!
All I'm saying is be careful, for the ECU to be able to deal with a completely different intake and exhaust they would have wide band O2 sensors which they dont have, they are narrow band....Dynos can easily be manipulated.
below are three dyno charts, two stock bikes by independent respected magazines that are selling nothing and one by someone who is helping sell a product which has a suspiciously low base figure and shows the same end results that other charts show on a stock bike.....Like I say, that is suspicious.
Either way as I said above the ECU will probably be able to cope with minor X-pipe/silencer adjustments but if you open the intake up, (which you will need to do for any meaningful performance gains) more air means leaner air fuel ratio which the ECU will not be able to deal with you would need to use a Power Commander or similar product to add fuel where it's needed...

 

Hi Midas,

.....you clearly have studied and understand this subject a lot more deeply than most of us on the Forum so I appreciate your comments on what is the best way to achieve improved performance for the least outlay and in a way that is not detrimental to the ongoing health of the motor..........and performance for me is 'go' and not just 'noise'.

Have you got any dyno print-outs you can share with us of your Super Charged odyssey to the alter of ultimate Thruxton performance?.....I'd love to see what that blower does to the torque figures....

Cheers,

dickydido

 

No mate, he hasn't sent me the chart yet, I've seen it....there are a couple of things that need ironing out (the fuelling/ ignition timing low down needs sorting out) and I'm gonna have to take the bike back down there. I'll do a write up after I've been back there, good or bad. I'm just a bit pushed for the next week or two.
The figure are suposedly 148hp and 115-120ft/lb TQ....but like I said earlier dyno charts can be misleading especially from someone thats selling something. I'll take it and do a run on another dyno to confirm those figures or not.
I'm a bit sceptical as his dyno reads high on the base figure compared to what I've seen elsewhere......The base line figures are more like Triumph's crank figures than rear wheel figures. So,we shall have to wait and see!

 

Also, it's been a real pisser, it's hardly stopped raining here in sunny Manchester since I got the bike back here.....So I've only amnaged to get out on it for about 50 miles or so..