rev-limiter setting

[Orange Guzzi]

my 03' aluminum hits the rev limiter at the 6,900 rpm mark.  the red line is 8,000.  is this the normal range?
i have a pc3 on the bike.  i guess it only controls the fuel.  i did not see anything in the instructions regarding the engine timing or rev settings.

[Wayne Orwig]

my 03' aluminum hits the rev limiter at the 6,900 rpm mark.  the red line is 8,000.  is this the normal range?
i have a pc3 on the bike.  i guess it only controls the fuel.  i did not see anything in the instructions regarding the engine timing or rev settings.

I would say that your tachometer is off. That 15M is closer to 7800 RPM of so.

I don't know any practical way around it.

[gfritzmeier]

I've also got a 2003 Aluminum and I hit mine at about 6500. I'm wondering what did you do to correct the problem.  My problem just began about a month ago. Was first told it was fuel filter but know it looks like rev limiter. Anybody??

[bad Chad]

Your tach has to be off.

[Wayne Orwig]

I've also got a 2003 Aluminum and I hit mine at about 6500. I'm wondering what did you do to correct the problem.  My problem just began about a month ago. Was first told it was fuel filter but know it looks like rev limiter. Anybody??

Maybe the sidestand is bouncing on the switch.
Adjust it if needed.

[Moto Fugazzi]

The rev limiter just doesn't change on its own. Guzzidiag measures your RPM's, and at least you could verify your tach at idle. You can also change your rev limiter rpm with GD, but I don't recommend that.
Ken

[gfritzmeier]

Could be that I just noticed it recently. I may not of let it wind up like that previously. Anyway I was wondering if maybe it kicks in when it does because of the hydraulic valves?

[Stormtruck2]

Are you gentleman implying that the Vegulia gauges could be inaccurate??   That could never be!  ::) ;)

[Wayne Orwig]

Are you gentleman implying that the Vegulia gauges could be inaccurate??   That could never be!  ::) ;)

I don't believe the 2003 Aluminum has Veglia instruments. They are probably ITI, which is WORSE.  :o

[Wayne Orwig]

Anyway I was wondering if maybe it kicks in when it does because of the hydraulic valves?

No, the hydraulic lifter did not change the rev limit.
Check that switch if it is actually cutting out.

[gfritzmeier]

Wayne,  I guess what I'm trying to ask is, Is it possible that the rev limiter is set(from factory) as lower rpm's because of the hydraulic valves. Just a thought as it is my understanding that with hydraulic is they run better at a little lower rpm's.    What say you?  The switch seems to be OK

[Wayne Orwig]

Wayne,  I guess what I'm trying to ask is, Is it possible that the rev limiter is set(from factory) as lower rpm's because of the hydraulic valves. Just a thought as it is my understanding that with hydraulic is they run better at a little lower rpm's.    What say you?  The switch seems to be OK

No, my 2004 hits the limiter somewhere near the redline as expected.

[gfritzmeier]

 >:(  Previously I thought I was hitting the rev limiter because that's what it felt like.  I first noticed it after I put on some higher flowing mufflers so today thinking it might have something to do with the mufflers I put the originals back on and now rather than feeling like I hit the rev limiter the engine just stops. I turn off the key, only sit for about 10 to 15 seconds and the bike starts right up.
Now this baffles me and I'm hoping it doesn't for some of you.
Any ideas ??????

[andrewdonald1]

I am sure someone probably said this, but what about a problem with a fuel filter if you have one.
After you shut it down, maybe it allows enough reduced gas flow (like a buffer tank) to restart. 

[gfritzmeier]

That's what I was wondering.

[Wayne Orwig]

Not to rule anything out, as it could be anything, but it sounds electrical with the sudden cut off.

I would try replacing, and swapping, the relays.

And it still sounds like a sidestand switch.

[Orange Guzzi]

I had made another post regarding tachometers.  On my Sport 1100, the engine would shut off suddenly at high rpms.  A thought maybe that is how the rev limiter worked on the bike.  I disconnect the oem tachometer and the bike did not shut down at high rpms in the same way.  It was more of a stuttering.  You can disconnect the tach and see if that make a difference. 

[gfritzmeier]

 :bike   I think I figured mine out but it's even baffling as to why what I did makes sense.  I probably should have mentioned some of the changes I did to my bike before this started. I opened up my air box lid by cutting off the snorkels and drilling large holes in the lid..having never had a Guzzi previously not being able to short shift without shuddering bugged me. Allowing more air into intake gives the bike more low RPM power. I could now pull smoothly from 1500(approx) in 3rd gear. Then as I said previously I put on mufflers that flowed freely.  Stutters with after market muffler and stops with OEM muffler.  So I reasoned that maybe because it took in so much are that it needed to get more air out faster so I put on some megaphones and now it will run up to red line. Runs great so I'm happy.  Doesn't necessarily make sense but I'm not going to waste time trying to figure out why it works but it does.

[gfritzmeier]

Now to bring this issue up again 1 1/2 years later.  Late last fall my Alum. will run great up to 6500 rpm and then start cutting out. I don't know what to do. ReMap maybe or any suggestions you guys have. I'm not sure if a power commander is the answer. Got my confused. Not that it's a problem for riding but it something that's not right and I'd like to get it cured.   ?????????????

[fotoguzzi]

Now to bring this issue up again 1 1/2 years later.  Late last fall my Alum. will run great up to 6500 rpm and then start cutting out. I don't know what to do. ReMap maybe or any suggestions you guys have. I'm not sure if a power commander is the answer. Got my confused. Not that it's a problem for riding but it something that's not right and I'd like to get it cured.   ?????????????

get GD and check the acuracy of your tach.

assume you check out the sidestand cut out switch, right? do you have an electric fuel tap and is it opening all the way?

[flip]

A couple of years ago, I picked up a used Shiver. After riding for a little while, it would suddenly refuse to rev past 6000 rpms. After a couple of trips back to a dealership with them contacting the factory, it turned out to be an O2 sensor that apparantly was going bad and would show some strange readings. A new O2 sensor fixed the problem.

Could this be it?

[Wayne Orwig]

A couple of years ago, I picked up a used Shiver. After riding for a little while, it would suddenly refuse to rev past 6000 rpms. After a couple of trips back to a dealership with them contacting the factory, it turned out to be an O2 sensor that apparantly was going bad and would show some strange readings. A new O2 sensor fixed the problem.

Could this be it?

Since a 2003 Aluminum does not have such a thing, no.

[flip]

Since a 2003 Aluminum does not have such a thing, no.

Ok, I just break them. I don't know how to fix them.

[gfritzmeier]

OMG---thanks for your reply as I was dragging out a workshop manual to try to find what I didn't think I had.

[Groover]

^ ageed with the rodekyll'spost above. Limiters are typically set at the ECU. PC3's override the fuel maps, but not the RPM limiter. To remove that limit in bikes I've had in the past, the ECU required a flash/firmware update to a performance type map, then you can tweak with the PC3.

PC3's enable easy access to the maps, and that's a pro and a con. I'd also say take that out and start from the bottom up, then put it back in once sorted.

[gfritzmeier]

^ ageed with the rodekyll'spost above. Limiters are typically set at the ECU. PC3's override the fuel maps, but not the RPM limiter. To remove that limit in bikes I've had in the past, the ECU required a flash/firmware update to a performance type map, then you can tweak with the PC3.

PC3's enable easy access to the maps, and that's a pro and a con. I'd also say take that out and start from the bottom up, then put it back in once sorted.

Be happy to remove the PCIII but I don't have one on the bike.

[gfritzmeier]

 Now to tell you something about my mechanical abilities. Until I retired if something were wrong with my bikes I would bring them to a shop to get fixed. I've driven Triumphs mostly and haven't had one that needed much since the 60's. In other words I've did nothing other than oil changes for years. Well as this is my first Guzzi and I'm retired I do most of the work or try. Well when I was looking at my workshop manual today I thought crap I think I put the ECU in backwards last year. Out to my garage and sure enough I had. I corrected that and reattached it. I then started bike and then revved it up to red line without a problem. In a couple days the weather should be good enough to get it out and see what it's like on the road.

[gfritzmeier]

I've got about the same mechanical potential as that except for the taking it to a shop part.  I haven't done that yet.  That said, the only part of your post that I understood was where you revved it to redline, apparently on the stand.  Maybe someone who does this for a living will correct me, but I don't think you should be redlining an unloaded engine.  the other part -- installing the (15M) ecu backwards -- How is that possible?

Rodekyll,,,,, Very easily. By looking at the manual I could see that the flat part of ECU was to face out and I had the fins facing out. Also it states that the ground cable belongs on the upper left corner of the ECU. Now I don't know if that particular corner makes a difference but it did then I had it connected wrong because I had the ECU turned around.

[gfritzmeier]

I don't have a Pc3 on my bike but I will shortly. I have no idea if what's actually happening is rev limiter or is running lean because of the modifications I've made. Hopefully this works.

[Wayne Orwig]

Do you have the Guzzi Diagnostics software and cable.
It is so cheap, it is foolish to NOT have it. You can then get a much better idea what the REAL revs are. You can see if the injectors are being cut off, or if the TPS value is going nuts. Or you can speculate for a few more weeks/months/years about it.