trganey
Expert Class
Posts: 196
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posted April 12, 2011 12:59 PM
08' ZX-14 ECU
What all can cause the ECU rev limiter to kick in @ 10k. Bike runs fine but the rev limiter is kicking in @ 10k. At least according to the "Shift Minder", "MPS Shift Kill", and "Data Logger". This is on my TG drag bike. I'm running the stock ECU, injectors, wiring harness etc. I just need to know what all to check that the ECU could be seeing that could be causing it to activate the lower limit. Any suggestions appreciated!
Thanks,
TR Ganey
  
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BrucerZX14
Expert Class
Posts: 373
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posted April 12, 2011 01:22 PM
What does the tach on the bike register?
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smokinZX14
Needs a life
Posts: 10197
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posted April 12, 2011 01:49 PM
 Edited By: smokinZX14 on 12 Apr 2011 21:52
quote:
What all can cause the ECU rev limiter to kick in @ 10k. Bike runs fine but the rev limiter is kicking in @ 10k. At least according to the "Shift Minder", "MPS Shift Kill", and "Data Logger". This is on my TG drag bike. I'm running the stock ECU, injectors, wiring harness etc. I just need to know what all to check that the ECU could be seeing that could be causing it to activate the lower limit. Any suggestions appreciated!
Thanks,
TR Ganey
Well i'm not sure what you are seeing is wrong .. From what i understand there are two rev limiters that work together on a zx14 ... One is a soft limiter that comes on before the hard limiter kicks in ... The soft limiter you really can't feel it kick in , it's made to slow the motor a bit before you hit the hard limiter .. Roy has seen this happen on his data logger while running the standing mile .. Since i have found this info i did a little test with my bike ... I allway shift by the tach at 11.200 , the real RPM number would be around 10.600 because the factory Tach as we all know reads high ... So for a test i tried shifting at 11,000 on the Tach which would really be 10,400 or lower .. The bike picked up MPH in the 1/4 mile .. so again i moved the shift point down to just about 10,800 on the fatory tach or about 10,200 true reading .. The bike picked up more MPH again ...So as you can see that the bike is hitting a soft limiter long before you feel the hard limiter kick in ..
I feel that there is some ET and MPH to be found by raising the limiter by 400 or so RPMs .. I do know that the super sport ZX14s raise their limiters for extra power .. I have not tested this but i'm going to soon with a PVC rev extender ..
____________
Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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wrongway
Pro
Posts: 1078
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posted April 12, 2011 01:57 PM
quote:
What all can cause the ECU rev limiter to kick in @ 10k. Bike runs fine but the rev limiter is kicking in @ 10k. At least according to the "Shift Minder", "MPS Shift Kill", and "Data Logger". This is on my TG drag bike. I'm running the stock ECU, injectors, wiring harness etc. I just need to know what all to check that the ECU could be seeing that could be causing it to activate the lower limit. Any suggestions appreciated!
Thanks,
TR Ganey
do you have the zx-14 gauge cluster on the bike ? Is it showing any codes?
Roy
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trganey
Expert Class
Posts: 196
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posted April 12, 2011 03:08 PM
quote:
What does the tach on the bike register?
There is no tach on the bike.
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dakota9498
Pro
Posts: 1181
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posted April 12, 2011 03:09 PM
There you go, if you are using the stock ecu and the gauge cluster isn't plugged in you will get codes and it will put it into limp mode. There are a few people on here that have ran into that problem.
____________
2008 ZX14
Never argue with a fool, onlookers may not be able to tell the difference. ~Mark Twain
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Shane661
Needs a life
Posts: 11494
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posted April 12, 2011 03:10 PM
Edited By: Shane661 on 12 Apr 2011 23:11
quote:
quote:
What does the tach on the bike register?
There is no tach on the bike.
If you don't have the gauge cluster hooked up, it will throw a code and kick the limiter in early.
If you hook the cluster up, and ride it in the pits, the code will clear. Then you can get another pass before you have to do it all over again.
Shane
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trganey
Expert Class
Posts: 196
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posted April 12, 2011 03:24 PM
The limiter I'm hitting is definately a hard limit. I had a 10,400 shift chip in the mps and it wouldn't shift at all and the data logger indicated that it never made it past 10k. I put in a 9,800 chip and it made every shift after that. Unfortunately I have already stripped all of the none essential wires out of the harness. It sounds like I will have to wire a connector back in for a gauge set and temporarily connect one to see if it is showing any codes. Oh the joys of charting new teritory! LOL Bike ran well at Valdosta(8.28) before we shot ourselves in the foot. I feel like we could have picked up the other .08 easily if the limiter wasn't holding us back and probably could have made it anyway by taking away the kill in a couple gears but it just wasn't to be this time. Thanks for your replies and by all means keep them coming.
TR
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trganey
Expert Class
Posts: 196
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posted April 12, 2011 03:30 PM
quote:
There you go, if you are using the stock ecu and the gauge cluster isn't plugged in you will get codes and it will put it into limp mode. There are a few people on here that have ran into that problem.
I had an 07' motor in it at Indy last year and didn't have this problem. I did swap out the ECU to an 08' when I put in the 08' motor.
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Shane661
Needs a life
Posts: 11494
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posted April 12, 2011 03:36 PM
I had the issue on my '07 bike at Maxton.
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trganey
Expert Class
Posts: 196
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posted April 12, 2011 03:50 PM
I suppose I could mount the gauge cluster on it. I'd have to move the Dedenbear crossover delay somewhere else. LOL
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smokinZX14
Needs a life
Posts: 10197
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posted April 12, 2011 03:55 PM
quote:
quote:
There you go, if you are using the stock ecu and the gauge cluster isn't plugged in you will get codes and it will put it into limp mode. There are a few people on here that have ran into that problem.
I had an 07' motor in it at Indy last year and didn't have this problem. I did swap out the ECU to an 08' when I put in the 08' motor.
Did you swap out the wiring harness also ? I was told they were different between 07 and 08 ..
____________
Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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trganey
Expert Class
Posts: 196
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posted April 12, 2011 05:05 PM
We used the 07 harness and just changed out the ecu. I'll have to compare the electrical prints but I've never been told that they are different. Only the ecu. Thanks I'll check it out.
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wrongway
Pro
Posts: 1078
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posted April 13, 2011 04:39 AM
quote:
Did you swap out the wiring harness also ? I was told they were different between 07 and 08 ..
I dont have a manual for the '08 & up so I could not compare everything .... but I put an '08 ecu on my '06 . It did run without throwing any codes , but the 08 has has a longer pulse width for the smaller injectors so it ran real rich with 06 injectors.
Roy
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06redzx14
Pro
Posts: 1022
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posted April 13, 2011 04:57 AM
it's not hitting the rev limiter the bike is just extremely rich at that RPM because of the ECU switch. the 08+ ecu throws more fuel than the 06-07 models because of the difference in injectors
____________
06 alien head, no flies, PC+hub, 16/45 44 43, air shifter, dry shot
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wrongway
Pro
Posts: 1078
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posted April 13, 2011 03:28 PM
i think he said that he used the 07 wiring when he got the '08 motor and ECU....
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trganey
Expert Class
Posts: 196
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posted April 13, 2011 04:39 PM
You are correct, it is an 07' harness with an 08' ECU. As for the mixture being rich I don't think that is a problem because the data logger showed the mixture to be pretty consistant. The motor runs clean all the way until it hits the limiter @ 10k. Once we lowered the shift point below 10k there wasn't a problem. No limiter and shifted fine. We just need to be able to run it to the intended factory limiter so we'll have some performance cushion to use as the weather gets hotter later in the year.
TR
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ZX14Mike
Zone Head
Posts: 891
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posted April 13, 2011 07:30 PM
quote:
quote:
What all can cause the ECU rev limiter to kick in @ 10k. Bike runs fine but the rev limiter is kicking in @ 10k. At least according to the "Shift Minder", "MPS Shift Kill", and "Data Logger". This is on my TG drag bike. I'm running the stock ECU, injectors, wiring harness etc. I just need to know what all to check that the ECU could be seeing that could be causing it to activate the lower limit. Any suggestions appreciated!
Thanks,
TR Ganey
Well i'm not sure what you are seeing is wrong .. From what i understand there are two rev limiters that work together on a zx14 ... One is a soft limiter that comes on before the hard limiter kicks in ... The soft limiter you really can't feel it kick in , it's made to slow the motor a bit before you hit the hard limiter .. Roy has seen this happen on his data logger while running the standing mile .. Since i have found this info i did a little test with my bike ... I allway shift by the tach at 11.200 , the real RPM number would be around 10.600 because the factory Tach as we all know reads high ... So for a test i tried shifting at 11,000 on the Tach which would really be 10,400 or lower .. The bike picked up MPH in the 1/4 mile .. so again i moved the shift point down to just about 10,800 on the fatory tach or about 10,200 true reading .. The bike picked up more MPH again ...So as you can see that the bike is hitting a soft limiter long before you feel the hard limiter kick in ..
I feel that there is some ET and MPH to be found by raising the limiter by 400 or so RPMs .. I do know that the super sport ZX14s raise their limiters for extra power .. I have not tested this but i'm going to soon with a PVC rev extender ..
What you just said is interesting............When I talked with Sal about doing my motor he said something very similar........ he said the ZX felt very "lazy" in the upper gears at high RPM and he said reflashing the ECU and extending the rev limiter 400 RPM is a must do for any modified ZX 14............its interesting that he said 400 RPM just like you did, he said on a faster revving motor with more power this is a must do........i believe he also said the reflash can adjust both the soft and hard limiter.
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Ratfink
Novice Class
Posts: 93
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posted April 15, 2011 12:55 PM
i emailed them its a no go on the PCV
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Foster
Novice Class
Posts: 60
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posted April 19, 2011 06:08 PM
I had this problem too. The computer goes into a safety mode. I found out that when the gauges are not plugged in, the speed sensor does not get the power it needs and throws a code. Mine was doing the same thing about 9800 rpm hitting the limiter. I would hook up the gauges in the pits clear the code and then same thing next run.
I found that there is a wire coming from the gauges to the speed sensor that supplies voltage when the gauges are pugged in. All I did was tap into a power wire supplying the gauges and feed it to the speed sensor wire.
I did this about 3 years ago so I will have to check the book for the wire colors and voltages.
I did that and have not had a problem since. I spent ALOT of time trying to figure that one out.
Hope that helps, I will check the book to see exactly what wires I used.
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trganey
Expert Class
Posts: 196
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posted April 20, 2011 02:58 AM
Thanks a lot for your reply. I'd really appreciate it if you could let me know what wires you used. I did leave the speed sensor on the bike but it's not in it's stock location where it can produce a pulse, it's just tucked in behind the motor on the wiring harness. Thanks again for your help.
TR
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Foster
Novice Class
Posts: 60
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posted April 20, 2011 06:31 AM
It doesnt matter if it pulses. It just needs that voltage.
I will get that info today.
Bob
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Foster
Novice Class
Posts: 60
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posted April 20, 2011 11:30 AM
Ok, I looked at my bike, I still have the wires there to hook up the gauges. But that is ok if you dont. I tapped into the brown/white wire running to the gauge cluster, I tied the pink wire from the speed sensor to it.
So pink to Brown/white.
That will supply power to the speed sensor even when the gauges are gone.
That BR/W wire runs to a few different places, so grab your manual (pg.16-12) and trace it if you dont find it easily.
Let me know how that works out.
You have any pics of your bike?
foster1447@yahoo.com
Bob
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trganey
Expert Class
Posts: 196
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posted April 21, 2011 01:04 AM
Thanks for your help. I'll give an update as soon as I have an opportunity to get back to the track. I don't have a lot of pic's of the bike as it is still a work in progress but we are proud of what we've done so far. Still got a long way to go. Here's a pic of it last year @ Indy. I've got a few more from Valdosta last fall and this spring but have to up load them where I can share them. Thanks again for the information.
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Ninjabogey
Parking Attendant
Posts: 7
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posted April 25, 2011 03:11 AM
without a speed sensor pulse the ecu will set the ecu to 6th gear and hit the superbike speed limit of 186mph so the limiter kicks in a 9800pm. We hit this problem on the race car.
cheers
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