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Thread: GEN1 AKRA'S ON A GEN2?

Created on: 10/31/22 01:34 AM

Replies: 6

OZrevhead


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Sydney, Australia

Joined: 01/11/15

Posts: 150

GEN1 AKRAS ON A GEN2.... BROCKS CT NOT AKRA
10/31/22 1:34 AM

Guys, I read on the Ivans site that he claims the gen1 Akra headers give a mid range boost over later large diameter headers without a parallel loss in top end power, has anyone tried this on their gen2 14? Header theory says a smaller pipe should boost midrange but I want to know if anyone has tried it themselves.

I currently have Two Brothers carbon slip-ons with stock headers, apparently these work pretty well but I would love something more serious and would prefer to make a decision and only do one tune. I happen to have a set of Akra 4:1:2 titanium headers from a gen1 but I thought the early headers didn't fit the later taller motor? Maybe I need to do my own dyno comparison but tuners charge a fortune over here .... and bolt on comparison dyno pulls wont tell the whole story without a proper tune for each system ...

I would love to test these side by side:

1. Stock headers and Two Brothers slip-ons
2, Akra (actually BROCKS CT DUAL) headers with the Two Bros or a pair of stainless Yoshis I have here (need mid pipes to fit them)
3. Brand name 4:1 - Alien2 or a Yoshi (not keen on the aud 2000-2500 price tags though)

I have been searching for a used 4:1 but they are difficult to find, so what do you guys reckon?

Any help would be great.

:)


* Last updated by: OZrevhead on 11/12/2022 @ 9:55 PM *



OLD GIRL - 2007 Black zx14, Muzzy 4:1, PCV, QS, 1" risers, 165hp so far @ 142,000km, 9.995@142........ NEW BABY - 2014 Green/Black ZX14R, Two Bros slip-ons, PCV, Dynojet QS, 1" risers, Sargent seat, Brocks clutch kit, 206 HP on dyno

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Hub


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Joined: 02/05/09

Posts: 13707

RE: GEN1 AKRA'S ON A GEN2?
11/04/22 9:21 PM

This is one of those, you're on your own. Keep it in-house. The dyno fortune is just that. Assfactor is free. If you can tell by the swap and feel no gain? I'm no help I know.



Tormenting the motorcycling community one post at a time

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VicThing


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Joined: 07/17/14

Posts: 2361

RE: GEN1 AKRA'S ON A GEN2?
11/05/22 8:57 AM

IMO this is something you want to try, try it. If you want to KNOW it made a difference, the only way to do it is by numbers. Dyno is OK, but even the best dyno results don't always translate into real world performance. Ass-factor is probably the most important thing for most of us here. If you feel like your bike is "way faster" then I guess it probably is...for whatever it's worth.

If you really want to know, IMO dyno results combined with something like strip testing or your own testing may support or deny ass-factor.

Personally, it would be great if you did do some documentation on this then we all would have something to point to for sure, whether ass-factor agrees or disagrees.

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OZrevhead


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Location:

Sydney, Australia

Joined: 01/11/15

Posts: 150

RE: GEN1 AKRA'S ON A GEN2?
11/12/22 9:53 PM

OK gents, my memory was wrong, my headers are actually CT duals that I bought from here in 2016 .... can anyone vouch for their worth in today's market? Will they work on a Gen2? Or am I better off getting headers that were built for purpose?

Cheers



OLD GIRL - 2007 Black zx14, Muzzy 4:1, PCV, QS, 1" risers, 165hp so far @ 142,000km, 9.995@142........ NEW BABY - 2014 Green/Black ZX14R, Two Bros slip-ons, PCV, Dynojet QS, 1" risers, Sargent seat, Brocks clutch kit, 206 HP on dyno

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Hub


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Joined: 02/05/09

Posts: 13707

RE: GEN1 AKRA'S ON A GEN2?
11/13/22 6:59 AM

How about this... I cut a muffler open, saw trumpet type flair ends at the end of each individual pipe. I've seen an old photo of a Honda dyno with pipe after pipe hanging on a long rail, probably swapping out each design from formula.

Aftermarket is how to bend the pipes under the bike, access to the drain plug, wont drag if leaned over, I mean, whereas, the R&D for that one bike, one bend that puts out the power. Then there is the intake side and adjust to said change in air flow restriction, etc.

So the best pipe for OL performance is guess Who's? So it's right back to buy, buy, every pipe made for the 14 and who's ever so subtle change wins the flow> Not worth a dime in my mind to fine out.



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OZrevhead


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Location:

Sydney, Australia

Joined: 01/11/15

Posts: 150

RE: GEN1 AKRA'S ON A GEN2?
11/13/22 11:09 AM

Absolutely, that is why us little guys ask others to share their knowledge and experiences, so we might make a decent decision and hopefully get a decent result.

Dyno tuning is expensive here so it's costly to compare items, specially if you go backwards and want to revert settings. If money was not a limiting factor then so much can be done, but sadly it is.

All I want to know is if anyone has tried small pipe CT duals on a gen2. Ivan said the small pipe Akra gives a boost in torque, so I may have to try them on and see but the tuning won't be right so the test isn't totally valid.

:)



OLD GIRL - 2007 Black zx14, Muzzy 4:1, PCV, QS, 1" risers, 165hp so far @ 142,000km, 9.995@142........ NEW BABY - 2014 Green/Black ZX14R, Two Bros slip-ons, PCV, Dynojet QS, 1" risers, Sargent seat, Brocks clutch kit, 206 HP on dyno

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Hub


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Joined: 02/05/09

Posts: 13707

RE: GEN1 AKRA'S ON A GEN2?
11/14/22 8:58 AM

Pipe diameter is like Bernoulli's principal. Narrow diameter travels faster. But once out of the narrower diameter, the air slows down trying to fill the larger pipe diameter. Kind of see the torque being sustained more?



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