Exhaust Mid Section Work

[HisNibbs]

My experience is that my "arse dyno" is a very fickle thing. All sorts of factors have influence extra noise, any rough low running that suddenly clears and provides a step change and then there is the placebo effect.


IMHO a dyno test, or side by side roll on are probably the only true indicators. Having said that the Falco mid section does look like it could be improved...... personally I'd want to retain my twin Aprillia RC can set up.

[D-Rider]

Do bear in mind that the Falco system is not actually a true twin pipe setup as the mid section pipes combine - so theories of true twin pipe systems don't strictly apply here.
What's more, I've seen contradictory comments from fairly respected sources that suggest each configuration has the best mid range ..... it's probably all down in the detail and depending on pipe dimensions, manifold positions etc etc can bring results of greater variability than just whether it's 2into1 or a true twin pipe.

However, were we to have this shoot out, why would the twin pipe bike be the only one allowed to have a modified airbox? - sounds like a bit of cheating being proposed here!

BTW larger TBs would probably make little difference except at the top end - they could even make things worse in the miid range due to lower fuel/air velocity

[HisNibbs]

D

However, were we to have this shoot out, why would the twin pipe bike be the only one allowed to have a modified airbox? - sounds like a bit of cheating being proposed here!

BTW larger TBs would probably make little difference except at the top end - they could even make things worse in the mid range due to lower fuel/air velocity

I'm not proposing an unfair comparison. I'm just suggesting the "arse dyno" is probably sensitive to things other than G force..... and that with an engineer's eye, there "looks" to be scope for improvement to the Falco mid section.

We've already had the debate about larger TB's. It is rare that a single mod will make a big change, however it can facilitate or enhance other changes. So exhaust, air box, TB changes may be done so as to work together or to screw each other up. Though the dyno is the judge I've always been a bit like cousin Kevin and hoped for the best. (Who?)

[mangocrazy]

My Falco has a modified twin pipe system that is a genuine 'one pipe per cylinder' from exhaust port to can. No siamesing or balance pipes for me, no thankyou sirree Bob. It has standard Falco headers but the mid sections are larger bore and completely unlinked. Makes taking the exhaust system off an absolute breeze...

It certainly feels more urgent from memory in the midrange (and top end) than the standard setup but, as Keith says, memory can play tricks. Also it's a natural human trait to 'find' improvements where you hope to find them, especially when you've shelled out good money for said improvements.

I'd be very interested to put mine on a dyno in comparison with others, especially Falcos with specs that are directly comparable. Mine has Akrapovic cans, but I doubt they produce any more power than other aftermarket exhausts. Standard air filter and no other power-related mods.

One thing I do notice with the straight through (i.e. non-siamesed) setup is that it's noticeably louder than with the OE setup. Hardly surprising, I guess. The exhaust pulses also pummel you to death even at tickover when stood behind it. Nice.

[GregD-UK]

Hi all,

My mid-section was put on and I had the shotgun setup on when I visited a dyno last year. Some 114.5bhp at back wheel. But, had problems above 6K revs....

Later found out, my vacuum pipe was perished for the test, so wasn't a true bhp run. Having fixed the vacuum problem, I have noticed a considerable difference in power and it pulls stronger. This obviously was due to fuel starvation/over fuelling with the vacuum not working

May re-visit the dyno shop to get it checked. I have changed from shotgun to 2-1-2 high level setup. The noise is flippin awesome It sets off car alarms down my street

[mangocrazy]

I have changed from shotgun to 2-1-2 high level setup.

Now I'm proper confused... So you've got this viper's nest of pipes to enable you to fit a single can on the RHS of the bike, and you've now converted to twin-sided high level?

The noise is flippin awesome It sets off car alarms down my street

My 888 does that. Something to do with the sub-bass it puts out, I believe...

[HowardQ]

Do bear in mind that the Falco system is not actually a true twin pipe setup as the mid section pipes combine - so theories of true twin pipe systems don't strictly apply here.
What's more, I've seen contradictory comments from fairly respected sources that suggest each configuration has the best mid range ..... it's probably all down in the detail and depending on pipe dimensions, manifold positions etc etc can bring results of greater variability than just whether it's 2into1 or a true twin pipe.

However, were we to have this shoot out, why would the twin pipe bike be the only one allowed to have a modified airbox? - sounds like a bit of cheating being proposed here!

BTW larger TBs would probably make little difference except at the top end - they could even make things worse in the miid range due to lower fuel/air velocity

Sorry Andy, you misunderstood me, I meant simple air box and can mods for both set ups, just no other mods to throttle bodies etc. to confuse things further!

[blinkey501]

Do bear in mind that the Falco system is not actually a true twin pipe setup as the mid section pipes combine - so theories of true twin pipe systems don't strictly apply here.
What's more, I've seen contradictory comments from fairly respected sources that suggest each configuration has the best mid range ..... it's probably all down in the detail and depending on pipe dimensions, manifold positions etc etc can bring results of greater variability than just whether it's 2into1 or a true twin pipe.

However, were we to have this shoot out, why would the twin pipe bike be the only one allowed to have a modified airbox? - sounds like a bit of cheating being proposed here!

BTW larger TBs would probably make little difference except at the top end - they could even make things worse in the miid range due to lower fuel/air velocity

Sorry Andy, you misunderstood me, I meant simple air box and can mods for both set ups, just no other mods to throttle bodies etc. to confuse things further!

My silver falco in completely standard form including the cans was dyno'd has a bench mark before fitting the air box and after market cans.
The bike ran at an expected 108 BHP
I will take the mid section bike with a standard filter fitted and see what it produces.

[D-Rider]

Indeed - though it's not so much the "headline" power figure that is of interest here but the shape of the graph throughout the rev range (and also on partial throttle openings)

[cornish mafia]

That was my next question.....what is the standard BHP rear wheel of a Falco to start with.......i have seen 104bhp ? I took mine for a good blast today and have to say although it's been a while the bike was flying ........big grin !!!

[fatboy]

With regard to Mango's point no balance pipe ect..
My mate recently made a 4 into 2 for a 1200 Bandit using stock headers and slightly larger mid section with NO balance pipes twixt mid cylinders,shortie Fuel cans off god knows what
Result. Arse Dyno test, feels tons more urgent,loads more low end which is odd on a jap 4
Hope this confuses things further

[GregD-UK]

Hi all,

OK Mango, go to the gallery and look for "latest incarnation." There is what I have setup. 2-1-2
https://www.ridersite.com/viewtopic.ph ... highlight=

Am getting the plastics done in kawasaki violet shortly With gold frame.....

The joys of being single, non-smoker, and eating beans on toast for months

[blinkey501]

The joys of being single, non-smoker, and eating beans on toast for months

Eating beans on toast for months.
I bet you hav'nt got any friends either

[mangocrazy]

With regard to Mango's point no balance pipe ect..
My mate recently made a 4 into 2 for a 1200 Bandit using stock headers and slightly larger mid section with NO balance pipes twixt mid cylinders,shortie Fuel cans off god knows what
Result. Arse Dyno test, feels tons more urgent,loads more low end which is odd on a jap 4
Hope this confuses things further

That's what the guy who made my system (and also ones for my 888 and a TL1000S I used to own) says. He reckons the conventional wisdom is that balance pipe = better midrange. His view is the opposite, based on years of testing and practical experience. Balance pipes are mainly used by manufacturers to quieten bikes down, is his opinion.

[fatboy]

Greg, that looks really good but I have to ask why 2-1-2 ?
I may be being blonde here but any benefits other than tidy system ?