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      09-03-2014, 09:50 PM   #1
mecbain
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rev limiter auto

k k k, I know it's been discussed, it's been asked, I'm just pissed, and who knows maybe meanwhile someone found something somewhere that could help.

I want, no, I need to raise the rev limiter for a good 300-400rpm, why? Because this is an n/a engine that makes it's power up top and even though it might drop a little after where it's making it's peak hp, the gain you get by falling upper in the rpm ranger in the next gear when you shift more than compensates and even more.

I had this experience with every n/a car I had, those few hundred rpms make a difference.

I read a lot of threads on this, and I remember in one of them someone mentioning that OE tune was able to do it, but that it ended up reseting it's self back to factory setting, isn't there anyone that can just increase the rev limiter on an auto 330i?
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      09-03-2014, 09:54 PM   #2
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You should email OE and ask. I thought they could do it too.
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      09-04-2014, 09:06 AM   #3
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AA tune raises your rpm's by about 200. For me stock I could go 54 mph in 2nd to about 64 mph. So definitely worth it for me.
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      09-04-2014, 10:26 AM   #4
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Seems like a poor idea long term. Slushbox autos really aren't capable of handling the higher revs. This is why the RX-8 auto, as an example, has a redline 1500 rpm lower than the stick.
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      09-04-2014, 01:03 PM   #5
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Quote:
Originally Posted by TheSt|G View Post
Seems like a poor idea long term. Slushbox autos really aren't capable of handling the higher revs. This is why the RX-8 auto, as an example, has a redline 1500 rpm lower than the stick.
don't be so negative lol, I don't think that 200-300rpm over the existing limit will break it, maybe wear it down more?
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      09-04-2014, 01:18 PM   #6
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Originally Posted by mecbain View Post
don't be so negative lol, I don't think that 200-300rpm over the existing limit will break it, maybe wear it down more?
TIL Talking about mechanical limits is being negative.

Ultimately it is your car. If you have information proves BMW's engineers wrong and you trust it, by all means raise that redline.
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      09-04-2014, 01:44 PM   #7
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Originally Posted by TheSt|G View Post
TIL Talking about mechanical limits is being negative.

Ultimately it is your car. If you have information proves BMW's engineers wrong and you trust it, by all means raise that redline.
Wow, I was kidding around, I thought the lol implied it... relax a little bit, reason why I made it, is that you always burst everyone's bubble lol, not that you're not often right.

I'm also aware an auto tranny is not as strong as a manual, however we can assume that bmw allowed for some play, meaning that if the tranny/engine goes over the limit with a few hundred rpms it shouldn't blow, now how badly it affects it on the long term, I have no idea...but I'm willing to take the chance on that.
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      09-04-2014, 01:46 PM   #8
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Originally Posted by TheAxiom View Post
You should email OE and ask. I thought they could do it too.
Last year I almost went with them for my tune, I was ready to buy it and everything (there's a guy locally here that actually does business with them plus they had a special at that time). Before buying it I asked a few questions, nothing major, just basic information about the tune (one of them being about the rpm rev limiter), I'm usually very clear in my emails and to the point. Instead of answering any of those questions the person just send me a general information email about the tune with a link to a dynosheet on their web site of an e46 330i, at that moment I hesitated and decided not to go with them....
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      09-04-2014, 01:47 PM   #9
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Originally Posted by gunnerxq View Post
AA tune raises your rpm's by about 200. For me stock I could go 54 mph in 2nd to about 64 mph. So definitely worth it for me.
Manual I guess?
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      09-04-2014, 02:12 PM   #10
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Quote:
Originally Posted by mecbain View Post
Wow, I was kidding around, I thought the lol implied it... relax a little bit, reason why I made it, is that you always burst everyone's bubble lol, not that you're not often right.

I'm also aware an auto tranny is not as strong as a manual, however we can assume that bmw allowed for some play, meaning that if the tranny/engine goes over the limit with a few hundred rpms it shouldn't blow, now how badly it affects it on the long term, I have no idea...but I'm willing to take the chance on that.
I'm perfectly relaxed.

We could assume BMW engineered in some play, which is exactly what V6 Mustang owners did when they raised their top speed limited from 118mph. I can only imagine having your drive shaft detonate at 135mph is a pleasant experience.

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      09-04-2014, 03:24 PM   #11
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Quote:
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Wow, I was kidding around, I thought the lol implied it... relax a little bit, ...
Read his past posts.
All half-empty.
Never half-full.
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      09-04-2014, 03:49 PM   #12
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Quote:
Originally Posted by mecbain
k k k, I know it's been discussed, it's been asked, I'm just pissed, and who knows maybe meanwhile someone found something somewhere that could help.

I want, no, I need to raise the rev limiter for a good 300-400rpm, why? Because this is an n/a engine that makes it's power up top and even though it might drop a little after where it's making it's peak hp, the gain you get by falling upper in the rpm ranger in the next gear when you shift more than compensates and even more.

I had this experience with every n/a car I had, those few hundred rpms make a difference.

I read a lot of threads on this, and I remember in one of them someone mentioning that OE tune was able to do it, but that it ended up reseting it's self back to factory setting, isn't there anyone that can just increase the rev limiter on an auto 330i?
So why exactly do you need this? It is evident the hp drops off rapidly ~6600. I don't rev that high even on the track. How often do you bump the rev limit?
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      09-04-2014, 03:49 PM   #13
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Quote:
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Manual I guess?
Yep it is. But I think they do it for autos also
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      09-04-2014, 03:56 PM   #14
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MecBain another thing to remember is the factory spec head will only flow so much air. If you look at some dyno curves this motor starts to fall off near redline, auto or manual transmission.
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      09-04-2014, 07:39 PM   #15
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Power was optimized for ~7000rpm. There is no need to raise the limit, you'd actually have a shot of making less horsepower.
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      09-04-2014, 08:51 PM   #16
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7000 rpm upshift will put you back at 5000RPM or so, so you will be quicker overall. I know OE can adjust the shift points higher.
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      09-05-2014, 12:49 AM   #17
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Quote:
Originally Posted by TheSt|G View Post
I'm perfectly relaxed.

We could assume BMW engineered in some play, which is exactly what V6 Mustang owners did when they raised their top speed limited from 118mph. I can only imagine having your drive shaft detonate at 135mph is a pleasant experience.

I lol'd
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      09-05-2014, 07:09 AM   #18
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so much hyperbole.

these aren't mustangs. you aren't going to blow up your transmission by raising the rev limit 200rpm..
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      09-05-2014, 10:55 AM   #19
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so much hyperbole.

these aren't mustangs. you aren't going to blow up your transmission by raising the rev limit 200rpm..
You're right. BMW would never design things like a plastic flap post filter that disintegrates over time and gets sucked into the engine, or a variable cam timing system that detonates engines, or a failure prone crank case vent system that kills the engine, or so on and so forth.

There is a fine line between pessimism and realism.
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      09-05-2014, 10:58 AM   #20
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I can tell you what you DON'T do when you design a higher-budget good, you don't walk into the design architecture meeting and loudly proclaim "ALL SAFETY FACTORS MUST INCREASE 3X!"
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      09-05-2014, 11:17 AM   #21
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Quote:
Originally Posted by TheAxiom View Post
7000 rpm upshift will put you back at 5000RPM or so, so you will be quicker overall. I know OE can adjust the shift points higher.
Somebody who understands, this is not difficult, you look at the power you're making let's say between 7000rpm and 7300rpm versus the power in the next gear (depending of gear) so the power between let's say 4700rpm and 5000rpm, and than you can evaluate if it's worth it or not to shift higher in the RPM's, meaning if the delta is a plus or minus.

Usually for an N/A car is always worth it, especially that a rev limiter increase usually comes from a tune and a few supporting mods to allow for better air flow.

Now, the huge drop that we see on "some" dyno's just before the rev limiter (not talking after the peak where it starts to drop a little bit), could be due to a number of factors, but it's mostly due to the computer heavily retarding timing and lowering the a/f ratio (guessing a protection thing, I noticed that in my logs)

But again that wasn't the point if it's worth it or not, the point was if anyone knows lately of someone that was able to raise the rev limiter on an auto.

I've already checked with AA and OE a while back and both seem to increase the rev. limiter on manual only, as the auto has it's own DME, however I'm not sure if some have found a way to bypass that...

Last edited by mecbain; 09-05-2014 at 11:49 AM.
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      09-05-2014, 03:25 PM   #22
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Can other LCI auto owners chime in on this. My 2013 e92 auto easily revs to 7k rpm without any tune, granted I drive in sport manual all the time.

Regarding your question, I would be careful raising the rev limiter above the 7k limiter without any hardware mods, the kick-down to 7300RPM concerns me.
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