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BMW 3-Series (E90 E92) Forum
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Remove the 7000 RPM Rev Limiter
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08-30-2010, 02:25 AM | #1 |
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Remove the 7000 RPM Rev Limiter
Why can ecu flashes like (Giac & Dinan) remove the 7k rpm limiter and piggyback tunes can't?
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08-30-2010, 02:30 AM | #2 |
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IMHO, I don't see any use out of a higher rev limiter since the stock turbos max out at around 5-6k.
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08-30-2010, 03:14 AM | #3 |
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do you fully understand the meaning of "piggy back" ??
And upping the rev limiter isnt the smartest thing, especially if the valve springs etc weren't meant to be... |
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08-30-2010, 03:24 AM | #4 |
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I do understand what a piggyback is. I'm just wondering why do flash offer the ability to remove it and piggys don't. With the advance and sophistication of piggyback tunes as of late, I would think they will too tap into this. They can remap their tables to do less boost but carry higher in the rpm range. This would be great for upgraded turbos as well.
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08-30-2010, 03:40 AM | #6 | |
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08-30-2010, 03:41 AM | #7 |
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08-30-2010, 04:28 AM | #8 |
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It is because the piggyback tuners are dont have warranties if the engine blows up from higher revs. If dinan ups the revs and somethings blows its all covered. new engine plops right in.
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08-30-2010, 11:52 PM | #9 | |
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Even w/ Dinan, you still lose you're factory warrarnty, the work is just covered by Dinan. Hence the reason the Dinan flash is quite conservative.
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08-31-2010, 12:05 AM | #10 |
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They dont increase limit by much. I think 200 rpm? More a marketing gimick than anything practically useful. You are not going to get a high strung S2000 or M3 like performance from these Turbo cars. On the flip side, all the meat is in the right regions for daily consumption. You barely need to rev these beasts to get crazy forward motion compared to those high strung screamers with no torque to talk of. I'd rather have the N54 any day over the M3 engine.
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08-31-2010, 01:30 AM | #12 |
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Actually... A raised redline WILL help. On automatics for all six gears and the first three gears on a manual:
Redline: 7,000 / 7,200 Max HP RPM: 5,800 1st to 2nd: 3,928 / 4,040 2nd to 3rd: 4,547 / 4,677 3rd to 4th: 5,250 / 5,400 4th to 5th: 5,342 / 5,495 5th to 6th: 5,552 / 5,710 Anything under 5,800 means there's still acceleration to be had. People tend to forget that shifting drops your revs. The weakness of internal combustion engines...
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08-31-2010, 09:59 AM | #13 |
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I think it's funny how someone starts a thread with a question and then everyone gets on the person for asking the question instead of answering the person's question.
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08-31-2010, 10:35 AM | #15 | |
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there's no point increasing the rev limit because it has no benefit to performance. All you are left with is the disadvantages of raising the rev limit which are more stress on factory components that weren't tried and tested to run at higher speeds and more wear and tear on those components. If there was a reason to do it, i'm sure the tuners would.
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08-31-2010, 01:25 PM | #16 | |
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The only way to remove the 7K limit is th change this value in the DME... only flash can do this |
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08-31-2010, 01:42 PM | #17 | |
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I'll have to agree with this response unless Shiv or Mike can give another explanation. That being said, upping the rev limit on this engine doesnt make any sense at this point.
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08-31-2010, 02:10 PM | #18 | |
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08-31-2010, 02:13 PM | #19 | |
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even dinan themselves know it is not a good idea to bump up rpm for stock system and are planning to bringing bigger turbo in god-knows-when...
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but still even with aftermarket turbo, the peak boost on our turbos max out around 5k and i don't think that will change significantly even with aftermarket turbo setup or single turbo setup... (well, maybe those with aftermarket turbos can chim in)
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08-31-2010, 02:38 PM | #20 | |
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example, throw a gt40r on this motor and HP will probably peak right at redline but power under the curve will suffer for your typical daily use.
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08-31-2010, 03:21 PM | #21 | |
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