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Discussion Starter · #1 ·
I had the tores tune loaded last week to go with my zard and now it takes at least three times as long to start when cold. I'm hitting a Dyno war today so hopefully it will be worth it.
 

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The problem is that the short tuned length of the Zard silencer wants less fuel at low rpm. We are finding that the tunes that work fine with systems using longer midpipes, need to be leaned down under 4600 rpm to improve performance and starting with the Zard silencer.

There have been several discussions about the issue on this site.

Let us know the outcome of the "dyno war", and post any graphs if possible.
 

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Discussion Starter · #3 ·
I'll scan any printout I get and post it. I'll post a few pics too. Maybe this is a good excuse to get a tuneboy.
 

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Discussion Starter · #7 ·
Just the slip on. Any body know an easy way to post a .tif file. Speedy put down just shy of 110hp at the wheel. An 07 GSXR 1000 with a yosh pipe put down 171hp. Damn!
 

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If you host the tif on another site like Photobucket, you can post it here.

Or you can convert it into a bit map, jpeg, etc.
 

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That is the FIRST independent dyno for a Zard silencer I have seen - THANK YOU.

What were some of the other bikes putting out in comparison? Just trying to see how this dyno compares to others - it looks a bit lower than I would expect, but that can easily be dyno variations.
 

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Discussion Starter · #12 ·
The only other two bikes I saw the sheet for was an 03 GSXR 750, 91hp and the 07 GSXR with a yosh pipe, 171hp
 

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The numbers for the Yosh piped 07 GSXR 1000 sound about right - depending on tuning. But the 750 sound low - very low. The dyno could just read a bit lower than average.

Why are the runs done in 6th gear? Did the dyno operator do this?
I generally use 5th (closest to 1:1 gearing) and the engine is loaded better. Notice that on your graph, the smoothing is at 5, and the engine is erratic at higher revs. Runs in 5th gear would be less erratic, even using the smoothing set on 2. You would only have a very slight loss due to gearing between 5th and 6th.

Thanks again for the chart. ;D
 

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Discussion Starter · #14 ·
One thing I did notice and the guy running the dyno commented on it too was a very loud high pitched whistling sound after about 7500 rpm. By 9k you couldn't hear anything but that. A friend of mine got a short video on his phone I'll try and post that too.
 

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Was the whistling sound coming from the exhaust - like a flow restriction? That could be part of the erratic reading on the top end.

Does your Zard have a preforated cone baffle between the silencer and the oxygen sensor?
 

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Discussion Starter · #16 ·
Nothing in the pipe before the main baffle, sounded more like intake noise. The guy running the dyno suggested drilling some holes in the airbox. I've seen a couple of threads on airbox mods that I may try when I do the header mod but that too will have to wait for the tuneboy.
 

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Don't drill the airbox. You have more flow than you need. My bike made 108 hp stock, and 135 hp the last trip to the dyno with the stock airbox.

Drilling holes just adds noise - I really wish those who keep telling others to do this would test what they recommend and quit spreading old wive's tales.

Check the seal on the airbox to the throttle body. You likely have a gap somewhere.
 

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Discussion Starter · #18 ·
Thanks for the tip. I havent had the tank off yet but I'll go ahead and have a look to see if I can find anything. Also don't worry the last airbox I drilled was on an old RM 125 and after that it would stall in a light rain.
 

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Start by checking the seal on throttle number 3 - right side. This one tends to give problems.

Also, make sure the crankcase breather line is conected well.
 

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Discussion Starter · #20 ·
[video=youtube;TX551WNojWM]http://youtube.com/watch?v=TX551WNojWM[/video]

Theres the video you can here the whistle starting before the video ends
 
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