Rev. limiter on GT 3.2 V6 - Alfa Romeo Forum
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(Post Link) post #1 of 23 Old 15-09-16 Thread Starter
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Rev. limiter on GT 3.2 V6

Good morning

The GT has a rev. limiter set just below 6,000 rpm, then the ecu violently kicks in. This happens in first, second, third gear. Now my question is, when I drive in sixth gear close to top speed, the revs are at 5,000-5,500, can I push it past 6,000 or will the limiter also kick in? I am asking because I do not want a violent ecu cut-off at 240km/h's. I noticed the cruise control also does not work past 200km/h's.
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I assume it probably would do. You're still pushing the limit of the engine.
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I assume it probably would do. You're still pushing the limit of the engine.
That's just crazy when it kicks in I have to hold on , that's how violent it is. Why do they redline it at 7,000 but limit it at 6,000 with software and make the whole car shudder violently. What if you go over the soft limit by accident at 240km/h's??
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It sounds wrong that only 6000rpm could be reached in 3rd - Ok, I don't have a GT, my 156 can red line in any gear (even 6th once ). GT 32. Peak power is at 6200rpm. Rev limit it just above the 7000 red line. 7200 AFAIK.
2003 Alfa Romeo GT 3.2 V6 specifications, information, data, photos 115533

The GT top speed is 243km/h on flat road. Red line speed in 6th for the GT V6 gearbox you have is 280km/h. The GTV 3.0 box have slightly longer legs at 295km/h at red line. the 156 2.5 box have shorter legs at 260km/h at red line. So no you will not get ECU limit before wind resistance limits you
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The rev limiter on the GT 3.2 V6 should be at 6800. I think something is wrong with your car.

Is the MAF knackered? That would explain the refusal to rev higher than 6000.
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Originally Posted by Aramis View Post
I noticed the cruise control also does not work past 200km/h's.
Where in the world are you driving like that? German Autobahn?

UK speed limit 70mph (110kph)
Police generally won't take too much notice up to 80mph (130kph)
80 - 90mph (145kph) police will take notice
Over 90mph police will stop you & you'll get a ticket.
Over 100mph (160kph) court appearance & driving ban almost certain.
Get caught doing 120mph (200kph) & the British media will brand you a child-killing murderer.
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from elearn, for the gt 3.2 :
<snip>
Control of the maximum rpm
Depending on the rpm reached by the engine, the control unit:
over 6800 rpm cuts off the supply to the injectors (it is allowed to reach a maximum of 7000 rpm for a maximum of 5 s).
below 6600 rpm it restores the operation of the injectors.
<snip>
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(Post Link) post #8 of 23 Old 15-09-16 Thread Starter
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yeah, that's what I thought but as soon as I go over 6,000 it violently cuts off and gives me the ecu fault even though I should still have 1,000 or so revs left. Also when I short-shift to 2nd from standing start and shift to third at 6,000 it will cut power to the engine even though the revs then in third only at about 5,000.

I will make a video later today to show you guys what I mean. This GT has never seen 7,000 or 6,500 for that matter but once it is going it all happens very fast from 5,000 to six, I might be just over 6,000 but never 6,500 or 7,000 hence my top speed is only about 330 at just below 6,000 and then I get the shiddles because of the violent cutoff at 6,000.

How would I test the MAF? Everything seems fine at lower revs, torque is there, I put my foot down just a wee bit and the power is there and it takes my at lightning speed to 6,000 but then BAAAM,
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Quote:
Originally Posted by Aramis View Post
yeah, that's what I thought but as soon as I go over 6,000 it violently cuts off and gives me the ecu fault even though I should still have 1,000 or so revs left. .....
rev cutoff will not give you an ECU fault, so if you get an ecu fault you have another problem as cause.....
Can you not read the fault to get an indication ?
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rev cutoff will not give you an ECU fault, so if you get an ecu fault you have another problem as cause.....
Can you not read the fault to get an indication ?
just at 6,000 rpm everything just shuts off, then I get Engine Control Unit Failure on my display and it goes beep beep beep. That's what I don't want to happen at higher speeds as the cutoff makes the whole car shudder. After that it continues as if nothing happened.

Only fault code I got was a false reading on one of the lambdas? But like I said, it's been doing that since I got it, I just accepted it as being the normal cutoff procedure once past 6,000 rpm but now I hear it cuts off at 6,800 only??
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Quote:
Originally Posted by Aramis View Post
just at 6,000 rpm everything just shuts off, then I get Engine Control Unit Failure on my display and it goes beep beep beep. That's what I don't want to happen at higher speeds as the cutoff makes the whole car shudder. After that it continues as if nothing happened.

Only fault code I got was a false reading on one of the lambdas? But like I said, it's been doing that since I got it, I just accepted it as being the normal cutoff procedure once past 6,000 rpm but now I hear it cuts off at 6,800 only??
None of what you have happen is normal.
As said before, hitting the rev limit does not produce an ECU fault.

It needs looking at. It could be that the ECU itself is failing (expensive and very hard to find).
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or some dodgy remap....
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or some dodgy remap....
Nope, she is stock and the guys at the dealership reset the ecu after they installed the alternator and said everything is fine there was only a lambda sensor error by the cats which is fine. Like I said, it's always been that way for 2 years now, not getting worse or anything, I was just under the wrong impression then the whole time.

Can I post video into the thread?
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You be an issue with the crank sensor or the toothed wheel on the flywheel which it reads. If the signal becomes muddy, you will lose the electrical drive to the coilpacks and injectors which will make it feel like how you describe.

Does it do it when you are stationary as well, if you build the revs up slowly?
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Checked it now, on idle it goes to 7,000 and beyond, no problem, in gear it cuts out at 6,100
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Is this 6,100rpm according to the rpm gauge on the dash, or according to diagnostic device plugged in while the engine is running?

Also what is the fault code that comes on?
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(Post Link) post #17 of 23 Old 16-09-16 Thread Starter
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I looked on the gauge.

Motor Control System Error, then beep beep beep.

I have a video here https://www.facebook.com/mikael.maka...5724471843248/

I also noticed, when I am in first gear and slowly bring the revs up, then it goes to 7,000 but it seems as soon as I put my foot down it cuts off at around 6,000. and only in first I can go to 6,800, in second it cuts out. Also the speed I bring the revs up seems to make a difference.
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Can't see video.
Probably the privacy settings not public.
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Oh sorry, yes privacy settings, here you go https://www.facebook.com/mikael.maka...5731685175860/
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You need to plug in and see what error code it gives, go from there. Everything else is just guessing.
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You need to plug in and see what error code it gives, go from there. Everything else is just guessing.
OK, will do tonight but the problem is it doesnt do it on idle so I have to drive or will I be able to pull the data after the fact?
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Code should be present in the memory already.
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ok, have to re-solder my OBDii cable, which pin again for engine management? 1 and 7?
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