GPR exhaust for the Tenere
 

Hi !

First of all thanks for good reading and information in this site.

Just got myself a 09 Black Tenere with Yamaha sidecases and handguards with under 3000 km on the display.

I have ridden alot of adventure bikes so far :KTM 950,Varadero,BMW 1200 Adv,Africa Twin,Transalp,BMW 800 GS

I sold my last bike and bought the Tenere to have a inexpensive bike. Better then "no bike"..

After a few weeks the bike suprise me with stability and good road behavior. Same fun as the more expensive and powerful bikes.

Anyway, my question. I am looking for a aftermarked pipes. For look and maybe save some kilos.

After mailing with "GPR exhaust systems" they have provided me with following information their Aluminium system:

- weight aprox 2,5 kilo
- repack every 5000 KM aprox
- no need for remap/power commander.
- comes with on-road "muffler" (removable)
- price aprox 400 pund delivered to door ex VAT (non Eu country)
-minimal change in gassoline usage

Anyone with experience on this exhaust system ? good/bad ? I would love to save some kilos and get a little more "ralley" look.

any chance that only changing the exhaust system will give me a little more power in the bottom (2500-3500 RPm) ?

They do look good, but why repack them every 5000kms, that is no good.

The most gain we see from exhaust systems is around 2 to 2.5 HP, you get this gain from mid to top end 3500 up wards. If you want better pull from the very bottom end fit a 14T front sprocket, or a 46/47 rear sprocket if you still run on the highway at times.

repack every 5k !!! so that's about every....... 2/3 month :p

what's the associated cost ? can it be done by the owner ?

That suprised me as well. Don't know if it is needed under "normal circumstances" Maybe for 5k hard offroad driving only ? I have sent a question to the supplier about that.

As far as I know repacking is simple and gives back the "optimal" resistance in the exhaust witch is was ment for.

Thanks for the tip. Does that mean that it's possible to loose some power in the low RPM's when going from stock to 3.party exhaust systems ?

Most of the time I am on "B-roads" 75-90 km/h. That means 2900-4000 RPM in fifth gear.

I am looking for a little more power when driving by cars, accelerating etc. maybe Powercommander and DNA is the only solution ?

Regarding the "repack" of exhast. Some producers give information about repacking, some does not. Is this due to different "build" or is it simply the fact that some producers don't see this as good advertisment.

As far as I know original exhaust don't need re-packing.

That's pretty much the same type of roads I ride, and to be honest for less than �400 you can get a Powercommander V and a DNA filter for the bike, this gives you the power you want to pass cars. I have the same requirements as you.

You can get the PowerCommander through Simon (on here) for a very good price already setup with a map for the DNA filter. I takes about an hour of so to fit to the bike (depending on your own skill) but the effects are very noticable.

As Kev says, a 14t front sprocket (�13 from www.wemoto.com) will give you some more bottom end, I'll let you know how this works with the PC-V after I've had a chance to fit it! I am anticipating another quatum leap in power delivery as it's already much more responsive with the PC & DNA

All absorption silencers will need repacking at various stages to maintain their efficiency. 5000 miles doesn't seem a lot to me.
2.5kg for a twin silencer system is impressive, especially including the link pipe...given that the LV system weighs close to 9kg and is also ally.
My single titanium race silencer weighs in at 1.4kg, so I'd check that they aren't just weighing a single silencer.

Not the only solution but the best gain for your money, bike just wants to rev now, see the other threads on this with dyno graphs etc.

2.5kg must be for one silencer

that 5000km approx, (3000 miles). I do that in less than 3 month.

I've honestly never "repacked" a silencer so i do not exactly know what it does involve (opening the can, removing the stuff, stuffing back stuff (glass wool thingy ?), closing the can)

I do not think it is very complicated/long, after all I can replace clutch plates, change chain and sprockets and other stuff... but it's just the hassle. But hey, maybe it's just a simple thing in comparison of the weight gain/increased throttle response/nicer sound ?

Ditto. It's simply a case of drilling the old rivets out, removing the core and old packing, wrapping new packing around the core, and re-rivetting. You can buy the packing from most good bike shops, especially ones which cater to the off road crowd.

Hi ! have decided to go for the Kev fuel mod and DNA filters. Looking forward to get the stuff.

As far as I can see there is not much weight gain in any 3.party exhaust change. On my KTM I saved a lot of kilos going from stock to Acrapovic.

Cheers

Guys,

what sort of gain are we talking about by installing fuel mod and DNA filters while keeping stock exhaust? and I dont only mean in terms of numbers but mostly in real life experience.

Cheers

I am about to find that out. Parts are coming and as soon as I have the KEV mod I will test.

I will test two things :

1. Stage 2 with air restrictor(no fuel mod)
2. Stage 2 with Kev fuel mod

I want to have the possiblity to run "stock". I live in one of the most restricted countries in the world. If they start whit EU-check's on bikes I want to be able to switch back to default flow.

With the PC-V you can have dual maps, so you can switch back very easily (and of course you need to swap the filter, or you could get a restrictor for the DNA filter?)

Ok, I didn't know it was possible to get the stock "fueling" with the PC-V. Is that a bypass function ?

As I understand the tank must off to get access to the PC-V. That would be some work for every service etc..

With the Kev Mod it would only be to turn the knob to "zero" and insert the restrictor.

Since we are talking about PC-V, do you know what price it is sold for here at XT660.com ? Guess it is cheaper then here in Norway even if I have to pay for shipping.

You put a switch on the PC-V, to switch between the two maps - simple!

No need to remove it for servicing and the tank only needs to come of for the first installation.

I've no idea about 'zero-ing' the Kev mod (Kev ??) to return to stock, but I can't see why not.

In both cases I think it's a case of switch/knob and restrictor, so easily reversed.

Ok, that is nice to know :) Thanks

so you are happy with the DNA/ PC-V combination ?

I am considering PC-V but since I have ordered the Kev-mod I will give that a try.

PC-V seems to be the more "correct" way of doing it but I don't want to spend hundreds of Euro on dyno testing. (if one of the existing maps don't fit my bike)

Very, although I wasn't convinced until I got the bike back out on the road.


You should speak to SimonC, depending on your setup there may be a map available. Sure you should get it tuned on a Dyno as every bike will have minor differences, but I'mm willing to put money on it that I wouldn't notice the difference (on mine) if it was.

I think you are right to try the Kev-Mod first. If it's just a filter you are changing then there's not relay any reason to spend the extra ����. If you then add other mods you should go for something like a PC-v

I have ordered DNA filter and the DNA snorkel removal kit.

did you do any other serious tuning to your bike ?

I will contact Simon for the PC-V when the time comes. First I will test and report back to the forum.

gpr
 

GPR all in is 7.4kg, standard 12.5kg

no cat

I have installed mine w/o removing the tank, I just needed to loose a litle bit the upper subframe screw in order to route the TPS connector.

have fun,

j.

I have done 10.000km with my gprs and never restuffed the things. I can't say that they make more noise or that the bike doesn't run as well as the beginning. So far I'm pleased with them.

gr Patrick

Thanks for the info, nice to know somebody have them. I am still considering witch exhaust system I will purchase