Z900RS

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Z900RS - Main Chat board / Re: 1000 miles, major(?] issue...
« Last post by m1shooter on Today at 10:38:45 PM »
*Originally Posted by m_mcdonnell [+]
ECU’s are tuned for emissions.  I’d bet they have a very conservative “max fuel” they are allowed to give, based on whatever measurements it can make (air flow, temperature, O2, etc.)

If you have a very free flowing exhaust, the bike (not just yours, but the bike in general) could still be running very lean even with the ECU maxed out on a stock tune.  There would simply be no more “adjustment” left for it to make.

You get it. The stock tune is looking for values between X and XX. When you free up flow and reduce concentrations lower than X, the stock tune can't do anything about it because it isn't set that low. This is no different than changing jets in a carb setup to compensate for changes in elevation, air intake, or exhaust. Someone that lives near sea level and a lot of humidity like myself and the OP may not see any issues related opening up the exhaust because of air density whereas someone living in the high mountain desert may find their bike unridable with the same tune and mods.
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Z900RS - Main Chat board / Re: 1000 miles, major(?] issue...
« Last post by m_mcdonnell on Today at 10:12:11 PM »
*Originally Posted by Evangelos K [+]
The ECU is set to provide the same optimal, as per factory, output, so no matter the freer flow, the ECU will read and adjusts to factory values.

ECU’s are tuned for emissions.  I’d bet they have a very conservative “max fuel” they are allowed to give, based on whatever measurements it can make (air flow, temperature, O2, etc.)

If you have a very free flowing exhaust, the bike (not just yours, but the bike in general) could still be running very lean even with the ECU maxed out on a stock tune.  There would simply be no more “adjustment” left for it to make.
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Z900RS - Main Chat board / Re: 1000 miles, major(?] issue...
« Last post by Evangelos K on Today at 08:59:47 PM »
*Originally Posted by m1shooter [+]
I really doubt that the issue you're having has anything to do with your exhaust, and I hope they get it sorted for you. It really is bu##sh#t that it has taken this long and they still don't have a resolution.

I do want to explain a little bit about how a get delete can effect upstream O2 readings..... By removing the restrictive cat, you're removing a choke point. The choke point causes a concentration of gases in all parts of the exhaust system all the way back to the combustion chamber. The stock ECU factors in having a high concentration of gases to measure. When you remove the restrictions down stream and reduce the concentration, you remove data points from the computer. An ECU reflash to match exhaust gas concentration levels will help to sort the information.

Yes, but the ECU reads and readjusts, really.  If that was the case, every full system will have issues.  It is also the reason a full system does not really provide any benefits without a tune.  The ECU is set to provide the same optimal, as per factory, output, so no matter the freer flow, the ECU will read and adjusts to factory values.
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Items for Sale / Re: Kawasaki Ergo Seat and Service Manual -- Both New
« Last post by mfairplay on Today at 08:14:03 PM »
Service manual is gone.
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On Two Wheels / Re: Kawasaki, please stop!
« Last post by CaliZed9 on Today at 07:28:56 PM »
*Originally Posted by OKZ [+]
It's the manner in which it delivers the power and torque, it's immediate at just about any rpm unlike the high revving/HP liter bikes. You really would not understand until you rode one.

Yep, my car is supercharged and the acceleration is instant.  Here’s a short vid of Randak’s puffer on an old Goldwing as an example.  Good looking bike too.

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Z900RS - Main Chat board / So, I had a couple of deliveries today
« Last post by mfairplay on Today at 07:20:48 PM »
Shipper delivered the big one this morning and the postman delivered the little one this afternoon.

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Items for Sale / Kawasaki Ergo Seat and Service Manual -- Both New
« Last post by mfairplay on Today at 06:48:59 PM »
KAWASAKI Z900 RS CAFÉ 2018-2019 ERGO-FIT Reduced Reach Seat 99994-1022 -- Tried it and decided I didn't need it. $350 with ground shipping in CONUS United States.
Kawasaki Service Manual -- New. $75 with shipping in CONUS.

I will ship anywhere else if you want to pay the extra postage.


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On Two Wheels / Re: Kawasaki, please stop!
« Last post by OKZ on Today at 06:23:10 PM »
*Originally Posted by Evangelos K [+]
Well, what is the point for a super charged bike that makes HP that Super Sports make anyway? Any SS litter bike makes 200HP, KTM and BMW nakeds, 180+

I get the ridiculous 260HP and 300HP on the H2 special editions, and the need for a SC, but IMO, what good does the SC do besides add weight, and bragging rights , on a 200HP bike that makes that power NA anyway?

It's the manner in which it delivers the power and torque, it's immediate at just about any rpm unlike the high revving/HP liter bikes. You really would not understand until you rode one.
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New Member Introductions / Re: Hello from Germany
« Last post by Kubi on Today at 05:59:31 PM »
Tach Thomas  :002:
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Z900RS - Main Chat board / Re: 1000 miles, major(?] issue...
« Last post by m1shooter on Today at 04:03:53 PM »
I really doubt that the issue you're having has anything to do with your exhaust, and I hope they get it sorted for you. It really is bu##sh#t that it has taken this long and they still don't have a resolution.

I do want to explain a little bit about how a get delete can effect upstream O2 readings..... By removing the restrictive cat, you're removing a choke point. The choke point causes a concentration of gases in all parts of the exhaust system all the way back to the combustion chamber. The stock ECU factors in having a high concentration of gases to measure. When you remove the restrictions down stream and reduce the concentration, you remove data points from the computer. An ECU reflash to match exhaust gas concentration levels will help to sort the information.
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