full akrapovic or fcrs

cheesie · Post by **cheesie** » Sat Dec 09, 2006 9:36 pm

what do you think I should go for at the moment there is twin art cans on it, not sure if I should go for a full akrapovic first or fcrs

Post by **Max** » Sat Dec 09, 2006 11:09 pm

Both!

Killerwhale · Post by **Killerwhale** » Sat Dec 09, 2006 11:20 pm

cheesie wrote:what do you think I should go for at the moment there is twin art cans on it, not sure if I should go for a full akrapovic first or fcrs

If you already got open cans FCRÃƒâ€šÃ‚Â´s of course!

Akra sounds shiate if you ask me, kind of a can sound to it....but it saves weight if your after that....

philk · Post by **philk** » Sun Dec 10, 2006 10:00 am

I went for the Akra, with the new style hex can, go for the titanium as apparently over time as the waddind in the can thins, twin and single cylinder engines could blow a hole out of the side of carbon cans...

But i havnt decided on caburation yet just handling at the moment.

honkdawillydahonk · Post by **honkdawillydahonk** » Sun Dec 10, 2006 10:10 am

philk wrote:I went for the Akra, with the new style hex can, go for the titanium as apparently over time as the waddind in the can thins, twin and single cylinder engines could blow a hole the side of carbon cans....

philk · Post by **philk** » Sun Dec 10, 2006 10:20 am

Yes Mr Honk!! I appreciate that you have the carbon version, and in my oppinion it looks nicer.
But i wanted longevity.

And before i get shot down...I was advised this by the supplier.

cheesie · Post by **cheesie** » Sun Dec 10, 2006 11:32 am

my friend has a tl 1000 which split its carbon end cans but the tl is a diferent beast altogether I doubt a trx would have anywere near the same power pulses I have put carbon fibre on all my bikes. my mates end cans were cheap options also

Post by **Max** » Sun Dec 10, 2006 1:10 pm

I blew the carbon tubes off a TL1000R a few years back. But it was because the rivits were drilled too close to the end. Rotated them a bit and redrilled farther in, no problem.

My SP Tadao carbon jobs seem to be holding up well.

Post by **phuk72** » Sun Dec 10, 2006 3:52 pm

Bear in mind that while the FCRs will deliver extra fuel and the removal of the airbox will deliver extra air, it needs to be removed from the motor.

The stock headers (although not heavily restrictive) do not flow gases as well as after market pipes.

I'd still go with the FCRs though.

Post by **Kevtrx849** » Sun Dec 10, 2006 4:54 pm

Swapped the fcrs onto the trackbike the other day and put the mikunis off it onto my road bike (K&N filter but no holes in air box) Took it for a run this morning. Backfired on start up

Bike just felt soft and lacked any real punch. Twist the throttle and the noise increased but it just didn't jump. Thought that the emulsion tubes might have been shagged but i got 275kms out of the 15 litres (170miles) Guess i've just been spoilt by the good stuff. I have the full Akra system fitted with a Yoshi can . Might try my perforated airbox next and give the balance a tweak. Does anyone know if it's likely to be the balance being out causing the backfire or more likely an air leak? Used to happen occasionally before i bought the fcr's. Sounds like a shotgun going off at 6am. Got all the dogs going in a 2k radius thats for sure.
CYA, Kev.

cheesie · Post by **cheesie** » Sun Dec 10, 2006 6:22 pm

I noticed the stock headers bend as soon as they leave the outlet ports which is bad for gas flow, has anyone checked the inner diameter of the stock headers compared to the likes of akrapovic ones on my xjr the akrapovics headers were the same id as the oem ones 34mm id gradualy getting bigger and ending up at I think 52mm id end can

burty · Post by **burty** » Sun Dec 10, 2006 8:53 pm

I reckon the diameter of the stock headers is way too small.

Mind you I have no information to back that up, but they do look tiny.

jpe · Post by **jpe** » Sun Dec 10, 2006 8:56 pm

cheesie wrote:the akrapovics headers were the same id as the oem ones gradualy getting bigger and ending up at I think 52mm id end can

Same here. Oem size at ports to make it fit, part from first bend to 2:nd tapers out to maybe 42 mm (don't remember) and single pipe to can is 52 mm id.

Check out phuk's or honk's bike or this image: http://www.r2d2.se/coppermine/albums/us ... 230004.JPG

Killerwhale · Post by **Killerwhale** » Sun Dec 10, 2006 9:08 pm

burty wrote:I reckon the diameter of the stock headers is way too small.

Mind you I have no information to back that up, but they do look tiny.

IÃƒâ€šÃ‚Â´ve actually confronted some of the makers of pipes why they donÃƒâ€šÃ‚Â´t do downpipes for the TRX and the reply has been that the originals are so oversized so it wont do much difference.
....but thatÃƒâ€šÃ‚Â´s answers from 4 makers...and there are hundreds of Ãƒâ€šÃ‚Â´em!

cheesie · Post by **cheesie** » Sun Dec 10, 2006 10:08 pm

as far as what I know or have read if your header pipes are to big you will loose a lot of low rpm punch as the engine needs some back presure, I am not sure what is the best system for two cylinder engines but on four the 4-2-1 is best for overall power and a 4-1 will see better results at the top end on a four cylinder engine the colector box has a big part to play, when one cylinder has expelled the gas the inertia helps helps draw a fresh mixture into the next cylinder giving closer to 100% volumeteric efeciancy how do the standard headers colect togerther I see on pictures that the akra flow nicely into eachother with no sharp bends or big steps in pipe diameter

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full akrapovic or fcrs

full akrapovic or fcrs

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