pc5 Tuning results stock w Graves vs custom - Yamaha R3 Forum
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post #1 of 8 Old 06-08-2019, 06:49 PM Thread Starter
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pc5 Tuning results stock w Graves vs custom

stock bike w Graves system (without dbkiller)


green = Graves exh system and no retuning


blue = same bike, same day and FUEL retuned


red = same bike, same day and IGN retuned (and fuel retrimmed)


The HP is in the lower reading TRUE HP scale. The 37.2 true number = about 42 dynojet when you add in their inflation factor.


The ign timing was significant.
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Last edited by MarcSalvisberg; 06-09-2019 at 05:39 PM.
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post #2 of 8 Old 06-09-2019, 03:00 AM
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Thank you, again direct comparisons, which everyone can understand.
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post #3 of 8 Old 06-19-2019, 09:50 AM
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Quote:
Originally Posted by MarcSalvisberg View Post
stock bike w Graves system (without dbkiller)


green = Graves exh system and no retuning


blue = same bike, same day and FUEL retuned


red = same bike, same day and IGN retuned (and fuel retrimmed)


The HP is in the lower reading TRUE HP scale. The 37.2 true number = about 42 dynojet when you add in their inflation factor.


The ign timing was significant.
Put the DB killer back in. It runs much better that way

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post #4 of 8 Old 06-19-2019, 12:12 PM Thread Starter
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Lightbulb

'
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Originally Posted by bbsteinnewyork View Post
Put the DB killer back in. It runs much better that way

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Looks like you guys have determined that.

I wasn't tasked with testing exh configurations, so, it may or may not have had the db killer installed.

FWIW, if the bike makes better power / a restricted outlet, that means that the pipe length isn't right and/or there's too much exhaust cam.

It was the same deal as a 89-90 fzr400 and a Yosh exhaust system - the bike made 1.5 to 2 hp more with the street baffle as compared to the "race" baffle.

Marc Salvisberg
Factory Pro Tuning
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post #5 of 8 Old 06-23-2019, 09:47 AM
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You don't know if it was installed or Not? Very scientific!
And so now your a pipe development guy as well. Let's see, nope I have never heard of the Salzburg pipe.

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post #6 of 8 Old 06-23-2019, 04:11 PM Thread Starter
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Originally Posted by bbsteinnewyork View Post
You don't know if it was installed or Not? Very scientific!
And so now your a pipe development guy as well. Let's see, nope I have never heard of the Salzburg pipe.

Sorry, the guy just brought it in to tune the fuel and ignition timing - not a development project. Mostly, the post was to show that there is, indeed power to be gained from both fuel and ign tuning when tuned to best power.


As I mentioned, an fzr400 yosh race pipe made better power with a street baffle in 1989. And we have done work for American Honda, Muzzy Kawasaki, Yoshimura Suzuki, VHR Yamaha, Graves, EBR, Colin Edwards, all the Haydens and Bostroms.


When I've done pipe work, the muffler still kept the sponsor's logo.


Did I do something wrong?



Marc Salvisberg
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post #7 of 8 Old 06-23-2019, 09:31 PM
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No, you just tripped the armchair-critic alarm. Some of us know about scope-of-work in contracts. That which is "not my problem", doesn't get done. If it wasn't in your scope of work to find the absolute best exhaust system configuration ... then it wasn't your job to as much as look at it.
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post #8 of 8 Old 06-24-2019, 06:21 AM
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Quote:
Originally Posted by GoFaster View Post
No, you just tripped the armchair-critic alarm. Some of us know about scope-of-work in contracts. That which is "not my problem", doesn't get done. If it wasn't in your scope of work to find the absolute best exhaust system configuration ... then it wasn't your job to as much as look at it.
Agree, before retiring done commissioning work for "Seadrill" on their 6th generation drillships in Korea.
Would see many faults just feet away that would bring problems.
But it were not down on my paperwork. Would mention it in the office at night, 50/50 it would be corrected before testing.
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