why did my mr2 suddenly pass its 180k limiter (210k)?

[streatracer]

my mr2 turbo has always hit a speed limiter at 180kph but the other day it went up to 210kph, i have a 300kph speedo, i slowed down in case something was wrong but nothing seemed to be different. why did this happen?

[Rick]

Have you removed the gearbox recently or done any work on it?, near the gearbox or computer, you might have damage the speed sensor/wiring for it etc..

[streatracer]

changed the springs? and put a factory bov back on maybe a mechanic bumped it?

[CozmoNz]

removed in japan, but the speed cut remover's earth has been damaged yeh, thats it .

nah, ours dont have one either :S you sure it had one in the first place? maybe you self conciounsly took your foot off the throttle?

oh, and got msn? pmz me!

[Akane]

All MR2's can go past 180kph, fuel cuts near around 200kph mark.

[Dell'Orto]

Yeah the speed limiter is 210kph...maybe your car kept hitting fuel cut with a leaky bov previously?

[CozmoNz]

All MR2's can go past 180kph, fuel cuts near around 200kph mark.

So your saying they have No speed cuts, but rely on fuel cuts?

wouldnt a fuel cut be based on the need for fuel... ie, if your doing 220kms down a hill, at like, no throttle, thus using bugger all fuel (compared to full throttle), wouldnt it never cut... so your speed would increase, until you hit wind resistance?

and what about gen 3 engines and above, they have bigger injectors, so wouldnt they have a higher *this speed until cut* theory?

[Lloyd]

Fuel cut happens at a certain speed so call it what you will


btw, your speedo may not be entirely accurate at such speeds

[CozmoNz]

Ah ok, i thought you ment fuel cut as in, maxing out injectors or something :S on second thoughts, thats a very silly idea isnt it .

yes, so it has a speed cut, and that cut happens via cutting fuel. right?

so they have a 200kph speed cut.

[Malcolm]

did you just change the face on your speedometer to a 300km/h one? You're probably only doing 150km/h at 210

[Dangerous_Driver]

did you just change the face on your speedometer to a 300km/h one? You're probably only doing 150km/h at 210

lmao.. i thought the speed cut was governed by ignition not fuel cut??

[CozmoNz]

seems silly eh?

5,000rpm in 5th gear at full throttle, and it makes you run lean? thats an expensive top speed run...

apparently toyota did it though X_X

[fivebob]

seems silly eh?

5,000rpm in 5th gear at full throttle, and it makes you run lean? thats an expensive top speed run...

No, it's 5500rpm in every import MR2 I've driven and it doesn't make it run lean, no fuel = no combustion.

And to answer the original question, the 300km/h speedo removes the limiter, so I don't know why you could only do 180km/h before.

[streatracer]

The guages r TRD and are accurate (i have speeding tickets to prove it)
it used to cut out at about 185 now it is 200 the 210 run was down hill dont know why that made a difference its still pulling hard at that speed is there an easy way to get rid of limiter?

[CozmoNz]

seems silly eh?

5,000rpm in 5th gear at full throttle, and it makes you run lean? thats an expensive top speed run...

No, it's 5500rpm in every import MR2 I've driven and it doesn't make it run lean, no fuel = no combustion.

And to answer the original question, the 300km/h speedo removes the limiter, so I don't know why you could only do 180km/h before.

5k rpm was a rough example, i was just saying, high rpm, high load condishions etc whatever, you knew what i ment!

easy way, get a speed cut remover... cant you make your own with jaycar bits?

[fivebob]

is there an easy way to get rid of limiter?

Yes buy a TRD Speedo , oops you've already done that, so why are you still getting fuel cut?

If it really is speed cut, which doesn't seem likely unless your TRD speedo is faulty, then viewtopic.php?p=193178#193178 has all the details you need to make your own device to remove it

[fivebob]

5k rpm was a rough example, i was just saying, high rpm, high load condishions etc whatever, you knew what i ment!

No I didn't know what you meant. I assumed you were posting accurate info, like everyone is supposed to in the Tech Forums

Besides which, high load, high rpm has no effect on the equation "no fuel = no combustion", i.e. it can't go lean if it doesn't burn.

[Al]

fivebob. I seem to recall on the TRD site that the speedos on offer had *does not remove 180km/h limiter* printed under the details of the speedos. Or is the mr2 one different?

[fivebob]

fivebob. I seem to recall on the TRD site that the speedos on offer had *does not remove 180km/h limiter* printed under the details of the speedos. Or is the mr2 one different?

Indeed it does say that . That's strange as I the info I got came from a usually reliable source

Just a thought though, perhaps it's only the mechanical ones that remove the limiter as they are the only ones that generate a signal for the ECU, the electronic ones just pass the signal from the gearbox sensor onto the ECU. Also supposedly replacing the speedo with a NZ new one removes the limiter, so I wonder if that too is only the case for mechanical speedos, i.e. pre Dec 91 production date.

Regardless of that, there is no reason for the speed cut to come in before 5500rpm in 5th which is around 200km/h, not the 180km/h that streatracer says it used to, neither is there any valid reason for it to change the speed at which cut occurs, downhill or not.

I wonder if it is actually speed cut and not some other form of fuel cut, like the one that supposedly occurs when the ECU determines that the AFM is flowing too much air, though this is just an unconfirmed internet rumour emanating from the MR2 owners club forums, so it needs to be taken with a shovel full of salt

[Adamal]

Speed cut is governed by the ECU isn't it? Be it ignition or fuel. Speedo would just be a trigger for the cut in the ECU.