Rev Limit at 5,500 RPM

[mvk24_imp]

Hey guys, OP posted in the reddit cb page also so I'm posting the photos he had trouble posting here.

This is the Gauge computer he got from ebay and this is his bike with the low profile gauges installed now. Maybe the image of the computer will help the diagnosis.

I'm with Gone thinking that the gauge doesn't know what bike it's on so it is displaying the wrong RPM on the screen but I think the bike is behaving normally and the gauge is calibrated wrong and telling him he's at 5500rpm when he's really at the 8k redline.



2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca
(I'm copy and pasting what I sent to OP on reddit because it may help the same issue for other members in the future)

https://youtu.be/HTamq_lYB54

Hey he sais in this video that when he was selecting how many cylinders the bike has in the programming it showed he was idling at like 5k.

Def seems like its a programming issue so far but im gonna watch a second video on programming the Chinese clusters

https://youtu.be/gMnse8Bzm_k video on programming these Chinese clusters.

Looks like your factor and cylinder settings are what really effect the RPMs and idle reading. This video seems to go more in depth on the programming and settings that that photo you sent of the manual it came with.

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca

[Gone in 60]

Great find mvk! Based on the fixed graphics on the dash, looks like the redline may not be adjustable or programmable.

The issue is likely a misinterpretation of the RPM signal by the dash. Are you getting a reasonably accurate RPM reading?

[Gone in 60]

Yeah, that was a common issue for the tech line where I used to work.

Have to say, the graphics on that little dash are pretty nice. I wonder if it's readable in full sunlight.

[wanobiben_imp]

Great find mvk! Based on the fixed graphics on the dash, looks like the redline may not be adjustable or programmable.

The issue is likely a misinterpretation of the RPM signal by the dash. Are you getting a reasonably accurate RPM reading?

I'm terrible at using this forum. The display on this meter is really clear and bright. I'm really impressed with the display. When I set it to 2 cylinders it seems to be the most accurate in it's rpm reading. It reads that it's idling around 1,000 rpm and it's rev seems accurate. The problem is that it redlines around 5,500 rpm. I rode the bike for a year before I changed out the meter so it feels like it's actually at 5,500 rpm, it's just acting like that's its new limit now.

I've read somewhere else on this forum that the bike ECU will limit the rpms in say 6th gear at about 5,500 rpm, and that using aftermarket meters could be giving the ECU a false gear reading making the ECU think it's always in 6th gear.

[Gone in 60]

The only way you’ll get true RPM is to take a signal from a sensor that’s independent of the ECU. If you’re using the ECU’s output for RPM, it’s telling your dash what it would have been telling the stock tach, which could be a proprietary signal to Honda, or compensated for the factory tach, etc.

That might be the cause of a wonky reading.

Super long shot, but there might be someone out there who makes a Honda interface that takes the ECU data and turns it into a generic signal that your dash will read.

[mvk24_imp]

wow. thats weird, but i could see that as well. the ecm feedback through the gauges ive head about on this bike is a huge pain in the ass, i swear. can you pick up the signal from a different source? on one of my other bikes i picked it up from an alternator lead, (ac) and had to set it to like 12 cyl or something ridiculous. But it worked very well, was an SPA technique unit.

If its #12 you may be thinking of the "Factor" or "signal" setting. That setting usually ranges from 1-12.

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca

[Gone in 60]

Alternate pickups can be inductive off of a spark plug wire, negative terminal on an ignition coil, pulse from a fuel injector lead...

[wanobiben_imp]

I don’t think the tach reading is an issue. It seems to be reading accurately. That said, I’m only basing this off of how I rode the bike before I changed out the meter. I never had an issue with hitting a rev limit before so I only assume that the tach is accurate and that something is wrong with the ECU or the new meter in causing the engine to hit the rev limit earlier than originally designed.

[Lord Popgun]

Just so you know, the bike has a bidirectional serial data line between the ECU and the Combination Meter. (2010-13 bikes do not have this)

The meter sends to the ECU: Rear wheel speed sensor signal

The ECU sends to the meter: High oil temperature indicator signal, Engine speed signal, MIL signal, Fuel pulse signal.

[mvk24_imp]

I don’t think the tach reading is an issue. It seems to be reading accurately. That said, I’m only basing this off of how I rode the bike before I changed out the meter. I never had an issue with hitting a rev limit before so I only assume that the tach is accurate and that something is wrong with the ECU or the new meter in causing the engine to hit the rev limit earlier than originally designed.

Etwee. That and pop guns info I'm thinning you have to wire up the original cluster and see if its still happening before you czn really troubleshoot any further


2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca