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Old 02-16-2004, 06:33 PM   #1
miafori
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7000+ rpm on 325i

Is it possible to rev the 325i engine at 7200 rpm? A guy said me he has a custom made chip and the tach needle exceeds 7000 rpm point. Is it lie or may be possible?
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Old 02-16-2004, 11:41 PM   #2
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Anything past 7100 on an internally stock M20 is a recipe for doom. That said, if he "hits" the limiter the needle will swing a bit past, they are not 100% accurate, especially with the momentum it would be carrying

Mine revs to 6900-7000, but taking it anything above 6500 is pointless. The engine doesn't make anything worthwhile up there.
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Old 02-17-2004, 12:49 AM   #3
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On a stock M20 engine ...I do not see the point.

1st thing to break in there is the rockers...
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Old 02-17-2004, 01:13 AM   #4
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you'de need heavier valve springs,and stronger rockers,but whats the sense?your cam grind cant keep up anyway.all the power is made down low on these engines
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Old 02-17-2004, 07:56 AM   #5
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miafori.

yes a chip could relase more rpms.
but there's no point in that.

Power peaks at 5500rpms for most M20's i've seen including mine.

unless if you have a cam, which will move the power more to the the higher revs. and then you should increase the rpms
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Old 02-17-2004, 09:11 AM   #6
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I have a schrick 288 with cast alloy rocker arms and schrick valve springs does this mean I should be able to hit my 6900 rpm limit???

I have been through 2 sets of rocker arms so far and but the stronger ones for the third time around.
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Old 02-17-2004, 03:58 PM   #7
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talk to objec he has a 2.7 motor that can rev to the skies limit and has 250hp on just motor.
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Old 02-17-2004, 03:58 PM   #8
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so he claims.
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Old 02-17-2004, 10:29 PM   #9
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Quote:
Originally posted by bmdoubleya
I have a schrick 288 with cast alloy rocker arms and schrick valve springs does this mean I should be able to hit my 6900 rpm limit???

I have been through 2 sets of rocker arms so far and but the stronger ones for the third time around.
You should be able to hit 6900 rpm with the stock rocker arms ....

A higher lift cam is harder on rocker arms and also the shrick valve springs will have much more tension .
This is why i went with the Metric Mechanics valve springs......
They are rated up to 9500 rpm and they also have about the same tension as OEM.

I still have the OEM rocker arms on my stroker with the 290 cam and MM valve springs...No broker rockers yet ....
Lucky up to now i guess....
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Old 02-18-2004, 01:20 AM   #10
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M20's are just sucking air past 6,000 RPM.
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Old 02-18-2004, 02:10 AM   #11
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Don't worry about tryin to find power so high in rpms real power comes from mid range. Thats why BMW's have such long intakes. Mid range power is more fun.
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Old 02-18-2004, 04:24 PM   #12
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I don't know about sucking air past 6000rpm. My car, while running rich at idle(static fuel pressure w/ M30 injectors and M30 AFM is near 4 bar), performs extremely well @ higher rpm levels. If you are leaning out @ higher rpms, my advice would be to purchase a rrfpr, run 3.5 bar fuel pressure, by a chip and tune your afm. I think you will be pleasantly surprised by the results.
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