OZ ATV :: The Australian ATV Forum

[4stroker]

a mate of mine just shelled out for a vortex on his '07, and after 32 dyno runs the best they could get out of it was 1hp over stock. (already has a pipe and filter)

does this sound right? hes not real happy as he thought hed get a bit more.

hes just ordered a hot cams exhaust cam for it as well on a recomendation from the mechanic, anyone got experience with these?

thanks, mark
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2002 SE Banshee

[REDTED]

Has it been 'custom' remapped to suit the mods done & the fuel to be used?
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Cheers-Redted. 04 Raptor

[4stroker]

4stroker wrote:

after 32 dyno runs the best they could get out of it was 1hp over stock. (already has a pipe and filter)

yep....
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2002 SE Banshee

[Todd 127]

Yeah sounds pretty right to me. I've dynoed each map 3 times to compare what map worked on my engine, i got about 2-3hp gain. i maybe could of got 1 or 2hp more, but didnt have the software to custom make our own maps, but didnt think the extra money and time to get that liitle bit more was worth it. Besides the peak HP figure i did gain torque and the throttle response was much better, so i was happy overall.

[4stroker]

so you got a 2-3hp gain? my mates only gettin a 1hp gain over the standard ingnition...

or are you sayin you got a 2-3hp gain overall with other mods?
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2002 SE Banshee

[Wadey]

We achieved 1.5 H.P top end gain with Vortex on my son's '07 LTR, but far far more impressive was the 20% torque at 6-7000 rpm, Not to mention the A/F ratio was off the scale before fitting the Vortex. It was ran on a car dyno in Geelong, suposably the latest and greatest, but the A/F meter couldnt even read how lean the LTR ran until the engine was about 6000 rpm

[PeteW]

4stroker wrote:

a mate of mine just shelled out for a vortex on his '07, and after 32 dyno runs the best they could get out of it was 1hp over stock. (already has a pipe and filter) does this sound right? hes not real happy as he thought hed get a bit more. hes just ordered a hot cams exhaust cam for it as well on a recomendation from the mechanic, anyone got experience with these? thanks, mark

If your mate is not happy he should ring Richard at Vortex CDI 03 5962 3000
he may have some explanation for you. There more important thing about a Vortex Ignition though is surley the map itself rather than the overall power gained.

If your mate wants different cam timing he's better off just changing the stock cam to YZ timing.
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www.thumbpump.com
www.dirtcomp.com.au

[Big Jb TRX450]

4stroker wrote:

a mate of mine just shelled out for a vortex on his '07, and after 32 dyno runs the best they could get out of it was 1hp over stock. (already has a pipe and filter) does this sound right? hes not real happy as he thought hed get a bit more. hes just ordered a hot cams exhaust cam for it as well on a recomendation from the mechanic, anyone got experience with these? thanks, mark

gday mark, 1st question i have is did your mate expect more BHP from the vortex?. reason im asking this is because when i got mine rigged up 2 my trx450 i wasnt after more HP, more like i wanted the bike to behave differently & it has done that. It feels different all round now, the throttle response is much more sharp & it has alot of extra punch now.
Has your mate said that it feels different? personally i couldnt care less if its not making more HP but it does rev harder now & has mulitple range of timing curves & thats what i was after
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04 TRX 450r
with a bit of this & a bit of that

[ATV PRO]

4stroker wrote:

a mate of mine just shelled out for a vortex on his '07, and after 32 dyno runs the best they could get out of it was 1hp over stock. (already has a pipe and filter) does this sound right? hes not real happy as he thought hed get a bit more. hes just ordered a hot cams exhaust cam for it as well on a recomendation from the mechanic, anyone got experience with these? thanks, mark

Hi Mark,
The reason for the diffferent curves is to allow or try different engine combinations and this is where they are Gold, if you have a fairly Tame build like Air Filter,Free flowing Exhaust system...you will usually notice better response ,acceleration and it should rev higher before hitting limiter,giving you a little more legs ,another scenario is putting an 41mm FCR Carby on the Honda TRX 450 R 04 -05 ,the Dyno shows the standard 42mm carby actually has more horse power ,but the bum dyno would swear you had gained heaps more as it accelerates much faster! and it will get you from A to B faster with less HP !There are much more considerations than HP ,Hope this helps you ! IMHO smooth delivery and Torq is what you are after in most disaplins,hard hitting power feels great but will make the Quad hard to ride fast and generally saps your energy,as a general rule engine combinations should be purpose built toward the disaplin you choose to ride then you get the most from your hard earned $$$
So Far as Hot Cams they work great as a drop in camshaft,retarding the standard Exhaust cam also works well as it moves the power mid to high and gives you the feeling of more power ,however on the Yfz more compression is the best gain in over all power and response , 13 to 1 works well ,it will also stress the engine more ,generally Yamaha YFZ 4fitys are good up to about 58 Hp ,after 60 Hp you may want to consider case modifications as they are know to have issues in the Higher HP combinations ,more Hp more maintinence and less reliabilty ,go hand in hand .
Cheers Len
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Cheers
Len

ATV PRO Pty Ltd

[4stroker]

yeah i think my mate may have missed the point of the vortex but oh well, its his quad ay!

he should have the exhaust cam in by now and i think they were going to try the vortex again with the cam, ill let you know how that goes.

mark.
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2002 SE Banshee