PDA

View Full Version : 7000+ rpm on 325i


miafori
02-16-2004, 06:33 PM
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?

Mystikal
02-16-2004, 11:41 PM
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.

The Sly
02-17-2004, 12:49 AM
On a stock M20 engine ...I do not see the point.

1st thing to break in there is the rockers...

felixthecat
02-17-2004, 01:13 AM
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

6piston
02-17-2004, 07:56 AM
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

bmdoubleya
02-17-2004, 09:11 AM
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.*sad*

Skunk#1
02-17-2004, 03:58 PM
talk to objec he has a 2.7 motor that can rev to the skies limit and has 250hp on just motor.

Skunk#1
02-17-2004, 03:58 PM
so he claims.

The Sly
02-17-2004, 10:29 PM
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.*sad*

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....

Digitalwave
02-18-2004, 01:20 AM
M20's are just sucking air past 6,000 RPM.

BimmerKris
02-18-2004, 02:10 AM
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.

jimmyd1
02-18-2004, 04:24 PM
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.