Speed Limiter on my e34 525i Touring

[bad_manners_god]

Hey folks. It's been awhile I've had this problem and I really ant to be rid of it.

The car is a 1992 e34 525i Touring

When I'm on the highway and going fast, as soon as I reach 170, a new messege appears on my computer screen says, "Max. 110mph"

And I also use to get an actual engine cut off at 205, but I Installed Dinan ECU chip and it went away.

From there, the climb to 200 is rather slow considering I'm in 4th at 4300rpm out of 7000rpm.

I never had this problem before. I was able to do 240+ with 5 people in the car. I'm not sure what the problem is exactly, but if anyone knows any computer reset's or something to get rid of the "max. 110mph" code.

[BMWDriver]

Well, I know the OBC can be set to chime when you go past a set speed (you set it). Other than that... can't help you with the engine.

[bad_manners_god]

Well, I know the OBC can be set to chime when you go past a set speed (you set it). Other than that... can't help you with the engine.

Yea, I set it to 260 in efforts of passing the damn limiter. The car will still acclerate but just not as quickly. I really need this code gone, I cant stand the fact that a simple vdub will get to 200 before me from a highway run which we all know how well Bmw's pull straight through to 200+

[Brandon J]

Hmm, well patience is a virtue.

Please tell us hwat modifications you have. Did you put the wheels on after the dinan chip? Are you using the correct fuel grade? What maintenance have you done to the car? etc.

The more info you give the easier it is to help you.

[bad_manners_god]

Hmm, well patience is a virtue.

Please tell us hwat modifications you have. Did you put the wheels on after the dinan chip? Are you using the correct fuel grade? What maintenance have you done to the car? etc.

The more info you give the easier it is to help you.

I've had this problem for a really long time, almost as long as I can remember. I original bought the chip in hopes of removing the limiter but no avail. I have Regular fuel most of the time, every 2 weeks, I drive it till it's almost empty and fill up with supreme to clean out the lines, injectors, etc. Here is a list of maintence I've done: (Note: I had this problem before ANY of this maintence was performed)

-New Upper Control Arms
-New Lower Control Arms
-New Cross member
-New Stabilizer Bars
-New Tie Rod Assemblies
-Rear Self-Leveling Delete
-Bored Intake Manifold
-Bored Throttle Body
-Custom Cold Air Intake
-DINAN Performance Chip
-DINAN Transmission Chip
-Fan Shroud Delete
-New Head Gasket
-New NKG Spark Plugs
-New Oil Pan
-New Oil Pan Gasket
-New Radiator
-New Thermostat
-New Thermostat Housing + Gasket
-New Valve Cover Gasket
-Polished Piston Heads and Valves

[Brandon J]

I've had this problem for a really long time, almost as long as I can remember. I original bought the chip in hopes of removing the limiter but no avail. I have Regular fuel most of the time, every 2 weeks, I drive it till it's almost empty and fill up with supreme to clean out the lines, injectors, etc. Here is a list of maintence I've done: (Note: I had this problem before ANY of this maintence was performed)

-New Upper Control Arms
-New Lower Control Arms
-New Cross member
-New Stabilizer Bars
-New Tie Rod Assemblies
-Rear Self-Leveling Delete
-Bored Intake Manifold
-Bored Throttle Body
-Custom Cold Air Intake
-DINAN Performance Chip
-DINAN Transmission Chip
-Fan Shroud Delete
-New Head Gasket
-New NKG Spark Plugs
-New Oil Pan
-New Oil Pan Gasket
-New Radiator
-New Thermostat
-New Thermostat Housing + Gasket
-New Valve Cover Gasket
-Polished Piston Heads and Valves

I have done almost everything naturally aspirated (w/o stroking) to the M50tu when I had that engine. Your throttle body didn't need to be bigger. I did M3 cams, 3 custom chips, flywheel, diff, custom intake, 540 MAF, etc. You don't need the larger TB and why did you delete the fan shroud. The shroud helps the radiator cool. If you have had this car and there has been a problem for a while, perhaps you got some bad gas one time and sucked some dirt into the fuel filter. This could limit the fuel you need for the load at those higher speeds. The fuel filter is on the list of maintenance things. The next thing I would check is the intake and MAF. If you are using an oil based high flow air filter, over time the oil on the filter can go onto the MAF sensor affecting its reading. If these are not the problems, then you might want to keep an eye on the fuel pump as they can go slowly or completely at once.

Here is another thing I would check. You say you have polished pistons and valves, and you increased the throttle body bore, did you add the extra fuel. Your car could be running lean and the computer could be trying to compensate. It can only do so much so you would need a new custom chip with the appropriate fuel pulse, timing, and flow. You got the head work done, you should have done more homework and known to get a custom chip or increase the fuel too. The '92 m50 engines don't have knock sensors like the '93 and up M50tu engines. So, if you are running lean and there is pinging, the computer will not tell you. Make sure you don't have any pinging from a lean condition. Go through a tunnel to hear the engine while driving under load.

I hope you do find the culprit as it looks like you are trying to make a very nice touring there. Good Luck and I hope the information here helps you out.

[bad_manners_god]

I have done almost everything naturally aspirated (w/o stroking) to the M50tu when I had that engine. Your throttle body didn't need to be bigger. I did M3 cams, 3 custom chips, flywheel, diff, custom intake, 540 MAF, etc. You don't need the larger TB and why did you delete the fan shroud. The shroud helps the radiator cool. If you have had this car and there has been a problem for a while, perhaps you got some bad gas one time and sucked some dirt into the fuel filter. This could limit the fuel you need for the load at those higher speeds. The fuel filter is on the list of maintenance things. The next thing I would check is the intake and MAF. If you are using an oil based high flow air filter, over time the oil on the filter can go onto the MAF sensor affecting its reading. If these are not the problems, then you might want to keep an eye on the fuel pump as they can go slowly or completely at once.

Here is another thing I would check. You say you have polished pistons and valves, and you increased the throttle body bore, did you add the extra fuel. Your car could be running lean and the computer could be trying to compensate. It can only do so much so you would need a new custom chip with the appropriate fuel pulse, timing, and flow. You got the head work done, you should have done more homework and known to get a custom chip or increase the fuel too. The '92 m50 engines don't have knock sensors like the '93 and up M50tu engines. So, if you are running lean and there is pinging, the computer will not tell you. Make sure you don't have any pinging from a lean condition. Go through a tunnel to hear the engine while driving under load.

I hope you do find the culprit as it looks like you are trying to make a very nice touring there. Good Luck and I hope the information here helps you out.

I should clear up the fact, that I didn't bore anything, I cleaned it out with a clean rag. The Pistons and Valves we're just cleaned with a heavy duty steel brush.

[Ross]

Since 170km roughly correlates to 110 mph I'm guessing the OBC is doing the conversion and displaying the reminder. If accompanied by the gong this is simply the resettable speed warning and does nothing to limit performance.
Supposedly the BM speed limiter takes effect at 155mph, this is moot with 2.5 liters.
240+ km with 5 on board? How long until you and your pals are scraped up with a shovel?
Scram all the "mods" and I'll bet the performance improves.

[bad_manners_god]

Since 170km roughly correlates to 110 mph I'm guessing the OBC is doing the conversion and displaying the reminder. If accompanied by the gong this is simply the resettable speed warning and does nothing to limit performance.
Supposedly the BM speed limiter takes effect at 155mph, this is moot with 2.5 liters.
240+ km with 5 on board? How long until you and your pals are scraped up with a shovel?
Scram all the "mods" and I'll bet the performance improves.

Scram?

I was doing 250 with 7 on board actually racing a supra non-turbo on the highway out-pulling him.

When the messege comes on, I hear the ding and then it starts accelerating slowly but I was able to get it up to 220, took almost 2 minutes from 175

[Ross]

The message should read "You are driving like a fool"