Dyno Results Needed - stock vs. pods/pipe/jet kit

[koolaid_kid]

Ed, my Kerker is ceramic coated, so no worries there. And with my Kerker the sound is a bit louder than stock, but is certainly not objectionable. I agree, though, that too many let their pipes rust and like to unpack their pipes or remove the baffle. But we know the brand of the biggest offender, by far, and it is not made in Japan.

[blowerbike]

to many idiots out there that has never been to a drag strip..
seat of the pants feel plus lower ET's and higher MPH should be proof enough.
the DJ kits have changed greatly sense 1981 or so.
DJ would have been out of business long ago if there parts did nothing.
koolaide you just can't tell some people anything...
sometimes they just need smacked up side the head

[Nessism]

Jim, that is horsepower, not percentage. You make a valid point, though, about the weight advantage. I will bring that up also.

Ed, it's too bad that all the data is not available.
Since the carb is the same except for jetting, would you conclude that the dip in the middle is due to the pipe? Perhaps the shape, curvature, collector design, etc.? Or could it be the needle/main transition in the CV carb?
An overall improvement of 6% peak is still far more than the Cycle World data, which saw virtually no improvement any where in the rpm range.

4:1 pipes are famous for high end power at the expense of midrange. Something to do with flow harmonics. Even on 4:2 set ups, manufacturers like Suzuki made those crossover tubes, or dump chambers in the exhaust to improve midrange. The entire business is very finicky. Make the header pipes too large, too small, not the right length, and you loose power. That's why so many of the cheaper pipes resulted in power losses, not a gain. That chart comparing pipes along with the stock airbox references that.

[trevor]

Hey Koolaid, I found the tread that I posted my results...

http://www.thegsresources.com/_forum/showthread.php?t=210801&highlight=dyno+results

[koolaid_kid]

This is the link to the actual document I have referenced. If you cannot open it, please send me a PM rather than putting the information in this thread.
I can see it, but I belong to the forum.
I have it saved as a jpg, but at 317k it far exceeds our limitation of 97.7k.


http://kzrider.com/forum/3-carbureto...e-lunch#585949

[Nessism]

This is the link to the actual document I have referenced. If you cannot open it, please send me a PM rather than putting the information in this thread.
I can see it, but I belong to the forum.
I have it saved as a jpg, but at 317k it far exceeds our limitation of 97.7k.


http://kzrider.com/forum/3-carbureto...e-lunch#585949

That's the same test I used to make one of those graphs.

[posplayr]

I know I read that article before but there are many new things that I picked up on this time or just forgot about reading.

[koolaid_kid]

Good, you can see the article. If you read through it, they do establish that the stock setup approaches the performance of the modified unit, not only on the dyno but also at the strip.

[posplayr]

Good, you can see the article. If you read through it, they do establish that the stock setup approaches the performance of the modified unit, not only on the dyno but also at the strip.

On the track the slowest ET was the most modified

And a kerker pipe with no jetting changes is the fastest.

Now who was it doing the tests?

[blowerbike]

this must be 30 year old data

[koolaid_kid]

this must be 30 year old data

Is that why it is so slow, it is 30 years old?
This was an article published in Cycle World.
That is everyone's justification for staying stock; the data from an independent source, Cycle World, supports it.

[UncleMike]

That is everyone's justification for staying stock; the data from an independent source, Cycle World, supports it.

Personally, I've stayed stock because it was easier to get it running right ... and I like the look/sound of dual pipes more than single.

That said, I do have a Dyno Stage 3 kit and I'm going to install the needles at some point into my stock setup.

[koolaid_kid]

The one thing to note on this article; they did not install a Dynojet kit. All they did was increase the size of the Mikuni main and pilot jets.
For me, tuning is not an issue because iI use my wideband. And\ my pipe has a nice mellow sound, not obnoxious.

[blowerbike]

my point is that there is no point.
the magazines had the v max as king dick and the magna bla bla bla.
all BS.
i seen many of the above mentioned shaft bikes at the track for years..
they wouldn't fall out of a tree.
1100/1150's
cb1100f and so on would and did destroy these magazine hero's.
all fluff.......................................

[koolaid_kid]

So, what did they have against aftermarket pipes and K&N filters? Seems like they would want the advertising revenue from those vendors.