ReV Limiter ...

[ZeroG]

I hit the ReV Limiter yesterday at about 6300 RPM's Or so. Is that normal? The car is a 1999 TI Sport. Is there a difference in the ReV limter from the M42 to M44, I could swear that my M42 use to Rev higher then that even before I had it removed.

-Chad

[canadian_ti]

Yeah,. I have a 95ti with an M42 Engine. I am not sure what exactly what it is but i'm sure it's higher that 6300RPM. I think my rev limiter is around 7000RPM.

[97Hellrot318ti]

I hit the ReV Limiter yesterday at about 6300 RPM's Or so. Is that normal? The car is a 1999 TI Sport. Is there a difference in the ReV limter from the M42 to M44, I could swear that my M42 use to Rev higher then that even before I had it removed.

-Chad

I believe it's 6500 on an M44... definitely not lower than that

[bmw///m3///]

I just talk to jim c about his chips so I know a little info, 6500 rpm is usually stock and most chips raise the limit to 7000 rpm, hopes that helps. I personally like the limit at 6500 rpm, much safer with my heavy foot.

[ZeroG]

I believe it's 6500 on an M44... definitely not lower than that
just remember right when the needle would hit the red, I would get ignition cut. It happened in first and second before I knew what ws going on.

It is deffintely safer. On my IS they say the ReV limit is 7300 (Dinan Originally) then modified by RMS (Did not touch the ReV Limter). I can usually get full use of the tach and have the needle bounce at the 7K mark because it can't go higher.

-Chad

[mickd]

I know I have seen 7000 on my M42. I don't have a chip.

[Tyler]

my owners manual says 6300rpm for a 98 ti

[ZeroG]

my owners manual says 6300rpm for a 98 ti

So I might have been right with this 6300 RPM thing.

[GDB]

my owners manual says 6300rpm for a 98 ti

I'm pretty sure my rev limiter is at 6300 on my M44. I always shift at or just above 6k, atleast when racing, so that's all I really pay attention to.

[marcus2116]

i have a turner chip on the m42 and i get passed 7000

[John Firestone]

I'm pretty sure my rev limiter is at 6300 on my M44. I always shift at or just above 6k, atleast when racing, so that's all I really pay attention to.Could it be 6500 rpm? That's the quoted number I have seen and what I have measured on my 1996 M44 3er.

If you guys are interested, I can log the engine bouncing on and off the rev-limiter and post a graph. I need to log some things while testing something else so it would be no big problem. Any preferences as to gear? There are unrestricted sections of the A27 near me so any gear is fine.

[cali-ti]

Fifth! :biggrin:

all this talk of rev limiters makes me feel like i drive like a grandma :no:

[John Firestone]

Normally, I probably also drive like some of the local grandma's because we have to pay ca. $5.50 a gallon for super unleaded. Of course, I know at least one who can drive her 320i to Stuttgart and the grandkids in less time than it takes the ICE train!

[mickd]

I know I have seen 7000 on my M42. I don't have a chip.
I didn't remember the tach redline range not having it in front of me when wrote this, I think I have seen over 6500 a few times. This morning on the way to work I hit a solid 6500 in 1st gear off a stop light. Do your rev limiters kick in where the red zone goes from hashed lines to solid red? I am pretty sure I have gotten pretty far in the solid red zone racing some Civics off the line, was just a glance though because I was concentrating more on driving.

[sKunkman]

Normally, I probably also drive like some of the local grandma's because we have to pay ca. $5.50 a gallon for super unleaded. Of course, I know at least one who can drive her 320i to Stuttgart and the grandkids in less time than it takes the ICE train!

5.50 a GALLON!!!!! In cali? Thats ridiculous....
here in VA it was 2.16 yesterday, 5.50 is just insane.

[ZeroG]

5.50 a GALLON!!!!! In cali? Thats ridiculous....
here in VA it was 2.16 yesterday, 5.50 is just insane.
I think that guy is in Europe, there is not place in Cali that will let you run fifth gear to ReV Limit without a problem. I filled up this morning with 91" (Premium) and I paid $2.59 Cheveron. Estimates are to have Cali gas to $3.00 or higher by summer.

I was reading an article somewhere that read death to the SUV!!! Whooooooooooo!!!

-Chad

[sKunkman]

I think that guy is in Europe, there is not place in Cali that will let you run fifth gear to ReV Limit without a problem. I filled up this morning with 91" (Premium) and I paid $2.59 Cheveron. Estimates are to have Cali gas to $3.00 or higher by summer.

I was reading an article somewhere that read death to the SUV!!! Whooooooooooo!!!

-Chad

Dear god I hate suvs. And yeah I guess he is in europe, they pay like 2 euros/liter and a gallon is 2.2 liters or something like that. So thats mad expensive. Of course, the people there have like 2 cylinder 30hp cars so they cant burn much gas.

[John Firestone]

There was a bit too much Friday afternoon traffic for me to reach the rev-limiter in fifth. I did, however, bounce off the rev limiter in fourth (http://www.unofficialbmw.com/images/m44_rev_limiter_iv.jpg).

The values you see plotted are those calculated by my ZZKE controller for its own use. They are rounded to the nearest 33 1/3 rpm and why the trace flips between only two values: 6470 and 6500 rpm. (That is enough for the controller's needs and it doesn't have the spare flash or time to do much more.)

I tend to the notion the rev limiter is at 6500 rpm on my 1996 M44 318is.

I also managed to bounce against the U.S. speed limiter in fifth (http://www.unofficialbmw.com/images/m44_us_speed_limiter.jpg). Again, the numbers are the controller's internally calculated values, this time rounded to the nearest km/h, from the pulses output by the rear differential speed sensor. As you can see, the limiting is fairly soft with about 5 km/h of hysteresis. I believe BMW NA quotes a top speed of 116 mph (187 km/h) as shown.

[97Hellrot318ti]

I think that guy is in Europe, there is not place in Cali that will let you run fifth gear to ReV Limit without a problem. I filled up this morning with 91" (Premium) and I paid $2.59 Cheveron. Estimates are to have Cali gas to $3.00 or higher by summer.

I was reading an article somewhere that read death to the SUV!!! Whooooooooooo!!!

-Chad

It says he's from Germany right underneath his name... John Firestone also mentioned a grandma driving to Stuttgart... I'm fairly certain that's not in California. "Ca." most likely meant circa or, around/about.

[John Firestone]

It says he's from Germany right underneath his name... John Firestone also mentioned a grandma driving to Stuttgart... I'm fairly certain that's not in California. "Ca." most likely meant circa or, around/about.Sorry. I did mean circa when I wrote ca. in front of the number. I couldn't find a Stuttgart, California with Google, but there does seem to be a town of Stuttgart, Arkansas, apparently in rice-growing country.

The A27 is more officially abbreviated BAB27 and is the Bundesautobahn 27 which has no speed limits beyond reasonable and proper once it gets away from the cities and into the countryside. It is quite good for clearing carbon build up and brake squeal.

I didn't mean to be cryptic: I will try to spell things out a little more next time.

[mickd]

I hit 6800 on my '95 M42 this morning in 2nd gear on a freeway on ramp. Never hit the rev limiter so there was more room to go. No chip.

[losichu]

I was very angry one day and did a burnout up to about 6900 and I have a Dinan chip. I thought the motor was going to blow up or that I would spin the crank bearing, but now my check engine light is on with about 6 codes so I shouldn't really do that anymore, but the engine was very strong up there.

[bmwhartgeM3]

the reason the M42 had a higher rev limit is because of the forged internals right?

[mickd]

I can't remember where I read it, an article about OBDI and II. To summerize, the OBDI system wasn't as tight in it's engine monitoring and control. OBII had a greater precision in it's control, a good thing, and closer emission contol because the Feds wanted it that way for our environment. Who knows? Just another theory. I wish I had an M44ti to compare. Don't know if it is the forged crank, maybe someone knows people at BMW and could ask. I was doubting whether I hit 7000 on my original post because I didn't have the tach in front of me, but I am pretty certain I did because 6800 felt strong and the engine sounded good. You can't break either of the motors, they're just so tough and reliable. A trusty horse. Just turned 123K.

[mickd]

Just found this thread on Bimmerforums http://forums.bimmerforums.com/forum/showthread.php?t=313564&highlight=OBDI+OBDII

[m44ic]

hey, just an idea but if I were to get cams,springs, etc, beef up the valve train because that seems to be the only weak point of these motors what could my highest possible reliable rev limit be? I was thinking around 7300rpm

[ZeroG]

hey, just an idea but if I were to get cams,springs, etc, beef up the valve train because that seems to be the only weak point of these motors what could my highest possible reliable rev limit be? I was thinking around 7300rpm

I have all the stuff that you mentioned above and more in my M42 along with a custom chip that has a rev limit of 7300 RPMS. The cams make the car pull so strong it feels like that car could go to 9K if you let it. I don't know what the exact RPM is, but at some point the harmonic balancer on the crank is no longer efficient and can cause problems.

FYI: They're not as bullet prrof as you think. I blew an exhaust valve at about 130K miles. I guess it did not like sitting at 6700 RPMS during a 1 1/2 minute Auto X lap.

-Chad

[m44ic]

I have all the stuff that you mentioned above and more in my M42 along with a custom chip that has a rev limit of 7300 RPMS. The cams make the car pull so strong it feels like that car could go to 9K if you let it. I don't know what the exact RPM is, but at some point the harmonic balancer on the crank is no longer efficient and can cause problems.

FYI: They're not as bullet prrof as you think. I blew an exhaust valve at about 130K miles. I guess it did not like sitting at 6700 RPMS during a 1 1/2 minute Auto X lap.

-Chad
sweet, where did you get the chip?

[ZeroG]

sweet, where did you get the chip?

Also known as RMS. The chip was for a long time back. I use a piggy back unit by split second to control fuel. I leave the chip in for the spark maps.

-Chad

[mickd]

Last week I hit the rev limiter in 1st on my M42 ti.The needle was at the small separation between the end of the solid red zone and the white line at 7000, which is 6900+ RPM.

[bmwhartgeM3]

yea i go right up to 7 on my M44 to drain it for every last bit when im ropping on it. its got the dinan chip tho which raises the rev limiter 250 more or so the book says. so stock should be around 6750 if the book is right.