Gen 5: 2016 -> Thoughts on M4 GP Exhaust - Page 2 - Kawasaki ZX-10R.net
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post #11 of 29 Old 03-01-2017, 04:55 AM
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I've always put a slip on and decated my last 3 new bike from day one . And never had them retuned . They've all run perfectly . I just picked up a gen5 last week and have no intention of having to tuned maybe after it's done 4000 kms just to put it on the dyno and see what it's doing and to get it tuned but not because it needs it . Just to see if I can get a bit more HP out of it . But it's not really necessary
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post #12 of 29 Old 03-03-2017, 04:06 AM Thread Starter
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I guess the only way to do so is to get a dyno run in post de-cat and measure AFR across the RPM range. M4 says a tune is not needed but will yield good results when done. I ordered a PCV and K&N filter anyways.
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post #13 of 29 Old 03-03-2017, 09:10 AM
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I had the m4 GP slip-on on my 636. If I ever get an slip-on for my Gen 5 (seriously thinking about it, only waiting money-wise), it's gonna be an m4 GP slip-on. Sounds way too awesome.
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post #14 of 29 Old 03-04-2017, 05:39 AM
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Without a full dyno-tune, any slip on or full exhaust you get will decrease your HP and increase the cool factor of crackles and pops and flames due to the lean fuel/air mix.

Prove me wrong, give me one example of a slip on that really increases HP without a full dyno tune...
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post #15 of 29 Old 03-04-2017, 05:42 AM Thread Starter
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Quote:
Originally Posted by Gen-Eric View Post
Without a full dyno-tune, any slip on or full exhaust you get will decrease your HP and increase the cool factor of crackles and pops and flames due to the lean fuel/air mix.
Do you have a dyno chart or an AFR log to go with that claim?
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post #16 of 29 Old 03-04-2017, 05:53 AM
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Do you have a dyno chart or an AFR log to go with that claim?
LOL, you prove me wrong. If slip on increased HP without tune, they would not crackle and pop because their fuel/air ratio would be correct - hence a possible increase in HP.

It's not a claim, it is common sense. Even I as a non-mechanic knows this. So you prove to me that a m4 exhaust slip on without a dyno tune will increase HP.
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post #17 of 29 Old 03-04-2017, 06:12 AM Thread Starter
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LOL, you prove me wrong. If slip on increased HP without tune, they would not crackle and pop because their fuel/air ratio would be correct - hence a possible increase in HP.
The crackle and popping happen when you release throttle, which is a point where you're not even asking for power. Even with the stock exhaust you hear very minor crackle/popping, an aftermarket exhaust only amplifies that.

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Originally Posted by Gen-Eric View Post
It's not a claim, it is common sense. Even I as a non-mechanic knows this. So you prove to me that a m4 exhaust slip on without a dyno tune will increase HP.
It is not common sense, it actually doesn't even make sense. I never claimed the M4 made hp nor am I after hp with the M4 exhaust, it's purely for the GP sound and to get rid of the ugly looking OEM exhaust. I'd even sacrifice a few hp's for that I don't mind.

The extra air flow you get from an exhaust causes your engine to run lean, meaning there's not enough fuel being burnt actually, so how does that translate to popping and backfiring? If there's not enough fuel being burnt in the chamber you think there'd be enough left to burn in your exhaust and cause popping and backfiring?
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post #18 of 29 Old 03-04-2017, 06:51 AM
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The crackle and popping happen when you release throttle, which is a point where you're not even asking for power. Even with the stock exhaust you hear very minor crackle/popping, an aftermarket exhaust only amplifies that.



It is not common sense, it actually doesn't even make sense. I never claimed the M4 made hp nor am I after hp with the M4 exhaust, it's purely for the GP sound and to get rid of the ugly looking OEM exhaust. I'd even sacrifice a few hp's for that I don't mind.

The extra air flow you get from an exhaust causes your engine to run lean, meaning there's not enough fuel being burnt actually, so how does that translate to popping and backfiring? If there's not enough fuel being burnt in the chamber you think there'd be enough left to burn in your exhaust and cause popping and backfiring?
Ahh ok, so you essentially concede that slip on without a full dyno tune will cost you HP, and add some crackle and pops, and sacrifice overall engine longevity is acceptable.

That's ok, you are not the exception to this rule, rather you are the norm.
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post #19 of 29 Old 03-04-2017, 08:51 AM
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Anybody run the "db killer" insert in the M4 GP exhaust? That was the first thing I did was remove it before installing the exhaust on my bike. Just wondered how much of a difference it makes.
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post #20 of 29 Old 03-04-2017, 09:23 AM
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it is really funny to me that people "don't want to flash the ecu" but, will spend more money on buying a pcv or bazzaz unit, and have to install, and deal with all of their software hardware, and customer service issues. AND THEN HAVE TO PAY TO GET IT TUNED ON TOP OF BUYING THE HARDWARE PACKAGE.

pcv and bazzaz are middle men, and need signals from the throttle position sensor, via the ecu, then they correct the fueling, timing, send the signal to the ignition, and injectors via the ecu... it is a wiring information loop with a slight lag or delay.

in laymans terms, the fueling/timing add ons (pcv bazzaz) sample at 1000 times a second (which is fast, don't get me wrong). the ecu samples at 10,000 times a second with no middle man between your throttle position sensor, ecu, and injectors. faster, smoother inputs, and outputs, equal crisper throttle response, and a more noticeable improvement.

also with a pcv YOU CANNOT, UNRESTRICT THE TIMING CURVES, GOVT MANDATED LIMITS, TURN OFF THE FUEL CUT ON DECELERATION, ECT... you can only augment timing and fueling.

you would be better to find a good reputable tuner that has a good flash, and map for your set up, and send the ecu, to them for a "canned set up" installed in your ecu, v.s paying the same or more money for a pcv, or bazzaz unit, and tuning via that. if you have a tuner that can flash via flashtune, woolich ect... ALL THE BETTER... USE THEM. it is ALOT BETTER, than using an add on fuel, ignition controller.

ecu flashing and tuning is where it is at. the future is now, power commanders, with add on functions had their place when we couldn't tune the ecu. we (you) don't NEED them ANY LONGER, IN THIS DAY AND AGE. you don't need to spend that money on the hardware, then tune it with the hardware. you would spend less with an ecu flash and dyno tune, and be done with it... with no added on CRAP, that can and will cause problems in tuning and rideability of the bike. Ski
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May we all, get to have a chance to ride the fast one, walk away wiser when we crash one, keep hopin that the best one is the last one.

Last edited by skidooboy; 03-04-2017 at 09:28 AM.
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