tune after exhaust (yes i searched) - ZX6R Forum
 
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post #1 of 7 Old 04-14-2017, 12:52 PM Thread Starter
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tune after exhaust (yes i searched)

05 636
Gutted the cat and disabled the exhaust flap and I'm about to put on a Yoshi slip on.
I was a professional auto tech and we did tons of full exhaust kits and the tune was just about getting the most out of the kit, not preventing an unwanted fuel air ratio or anything. I read a lot about people saying you "need" a tune. Do you really need a tune to protect the engine form running lean or rich? The physics don't make a lot of sense to me because i can't see how an exhaust is going to cause that much of a change in the combustion chamber. I get its going to be removing exhaust gas out more efficiently and maybe the bike is stock tuned to account for some un-burnt fuel being reused during the next spark. in a 1.8 turbo car at 6000rpms i know it does't make a difference and its more of a sales thing. But maybe in a .6 liter at 14000 RPMs it does.
Mostly i want to put this slip on on without hurting the bike. but i really cant afford a tune right now.
TIA
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post #2 of 7 Old 04-14-2017, 02:31 PM
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If u gutted the cat, yes a tune is recommended.
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post #3 of 7 Old 04-14-2017, 04:54 PM
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Do you have a Powercommander? If not I'd grab one and just put a yoshi map off their website. You'll be fine just putting around but could be running a little lean at wot as it is. You'll gain a good amount of power and smoothness throughout the rev range with a good dyno tune.
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post #4 of 7 Old 04-15-2017, 01:40 AM
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Most if not all car FI systems use an oxygen sensor to monitor the exhaust gasses to maintain the leanest, safe fuel/air ratio. The ECU constantly changes the mixture based on the amount of unburnt fuel. Very few bikes in the US do this.

Because of this, reducing the restrictions in the exhaust can make the bike more lean. As long as the cat is in place, you are not affecting the ratio enough for that to matter. Once the cat is out, a remapped ECU is advisable.

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #5 of 7 Old 04-15-2017, 06:07 AM
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"the most power" is a secondary goal to not blowing up your car fyi. Please post the name of the shop so we can all avoid it if they're doing tunes without a wideband o2.
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post #6 of 7 Old 04-17-2017, 06:33 AM Thread Starter
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Thanks for the replies. Ill go easy for now and grab a tune soon. Also the tunes at the shop and were from the company that designed the "stages". APR, DINAN, etc. They weren't custom tunes. And yeah, power was of coarse secondary to reliability on everything we did. But thanks for twisting my words. Been a while since i used a forum but nice to know you still can't post a question without finding that guy.
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post #7 of 7 Old 04-17-2017, 06:44 AM
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I'm sorry for twisting your words could you please elaborate on this statement?

"I was a professional auto tech and we did tons of full exhaust kits and the tune was just about getting the most out of the kit, not preventing an unwanted fuel air ratio or anything."

The bolded section in particular.
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