Ok the M50 engine intake(325 and 1995 M3, all OBDI) is less restrictive like jllphan said. We are talking about the whole system manifold and all. You can put a CAI on anything and it will help, but if you change out to the M50 it will be better than just a cold air intake. If you are going to do it, do it right.
Originally posted by jshearer@May 7 2005, 01:09 PM Ok the M50 engine intake(325 and 1995 M3, all OBDI) is less restrictive like jllphan said. We are talking about the whole system manifold and all. You can put a CAI on anything and it will help, but if you change out to the M50 it will be better than just a cold air intake. If you are going to do it, do it right.
What do you mean by change out to the M50 bud ? Kinda cinfused.
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We're not just talking about replacing the stock airbox....we're talking about the intake manifold.
The earlier intake manifolds (M50 engines 92-95) had better shape and flow. The later engines have more displacement (2.8L versus 2.5L) but a more restrictive intake manifold and engine management system (airbox, ECU, etc.) as they were equipped with OBDII.
So the best combo is what I have:
M52 2.8L engine
OBDI conversion->software upgrade
M50 intake manifold
good question. Don't know. I'm guessing no, as the M50 intake robs you a little in the low end tq. catagory, and if I remember correctly, the 323 dosn't have tons of that to begin with.
If you lke wringing out every last pony your 2.5L has, by taking it up to rev limiter, I'd say go for it, but if you don't consider yourself a rev happy individual, I'd probably save your money for other mods.
181 ft/lb stock....not much, but good for a 2.5L. I've done a 6.59 0-60 which is on a good run, but i can notice that it doesn't pull as hard past 4500 rpm which I was told was because of a restrictive intake manifold. It could be bogus though, I just though it had something to do with emissions?
here is the text on the website if anyone is interested.....sorry to hijack
"The Problem: Power Dying Out at 4500 RPMs
BMW's 96-99 6 cylinder engines found in the 323, 328, and M3 make fantastic torque in the lower RPM's and exhibit great daily driving power bands. However, the restrictive manifold used on these M52/S52 engines has a significant flaw: it simply doesn't flow enough air from 4500RPMs and up to keep your engine producing increasing horsepower to redline. The result? High RPM driving simply isn't as satisfying as it should be with power dying out so rapidly.
The Solution: A High Flowing Intake Manifold from the M50 Engine
The design of the 92-95 325 and M3 intake manifold from the M50 engine is different: the intake runner paths are significantly larger, allowing these engines to breathe more freely. Installation of this higher-flow intake manifold into the newer 96-99 323, 328, and M3 vehicles yields dramatic results: power gains as much as 20hp and a much more linear powerband that DOESN'T die out in the high RPMs. In fact, it does just the opposite, pressing you into your seat all the way to redline, drastically improving acceleration."
like i said, adding that will rob you of low end torque, so really it's a trade off. It's not so bad on the 328 engines, because they have so much tq. to begin with. Not really sure if the trade off is worth it...never tried it on that engine.
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