Umm wtf? (dinan)

http://www.dinan540.com/MODIFICATION...fications.html

The replacement intake manifolds feature larger diameter "runners" for improved engine efficiency at higher engine speeds (rpm), resulting in increased horsepower and torque. When installed in conjunction with fully matched Stage 5 Engine Software, the Cold Air Intake System, High Flow Throttle Body and Air Flow Meter, peak horsepower is increased to 321 @ 5700 rpm, for a 40 hp gain (with a peak gain of 48 hp @ 6500 rpm) over the stock rating; torque is up by 39 LB/ft @ 6000 rpm. The result is faster overall acceleration, with the car feeling noticeably more willing right up to the rev-limiter. Not available for cars produced prior to 9/98 because they already have larger intake manifolds, mass airflow meters and throttle bodys..

wouldnt you just snag an older Intake manifold then?

seems like unlikely performance gains. Especially the Dianan CAI on the shorter improved e39 540i intake... 11hp and 9trq? Wouldnt that be even higher on the m60?

Whats your thoughts on this?

that this means my old 4.0 stock is faster than the stock 4.4 e39?

well if they are going on the same principle that m52 guys do, its a compromise...the later m52 guys had smaller intake runners, so they used m50's (wider) to get better performance in the upper rpm range...but in doing soo they lost a lot of low end torque.

As GoldenOne said, its the same thing OBDII E36 cars do - they run OBDI M50 manifolds because of larger runners. The OBDI are proven to make more horsepower/torque at higher RPMs, but the OBDII manifolds make more torque at lower rpms. You have to give up something. I prefer the OBDI manifold and most M3 guys install it - its a nice setup.

i wonder if we can design a variable intake manifold that changes shape according to engine speed......

if you wanna spend that much, better you buy one upgrade Vortech supercharger. I guess it's the best and it's proven to gain upto +400HP

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Originally Posted by BillionPa

i wonder if we can design a variable intake manifold that changes shape according to engine speed......

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venturi has made carbs that do that for many years.

yeah, but that doesnt work for a turbocharged fuel injected engine.

You could do the same trick they did with the old Offy dual port intakes. The primary barrels had seperate runners which were very small to keep velocity high, the secondaries having their own runners just below the primary runners, which were larger. You could do the same thing on an injected car. The only difference is that fuel would come after the butterfly, instead of before as on a carbureted car.

So an intake with two sets of intake runners and ITB's on the secondary (larger) runners.

in the drag racing world Offy has always slowed the pack. with a 530 go with the 540 inlet box first, document timer and speeds from 60-80 then test again with each mod and go from there, I will post any gains losses in the archives.

Quote:

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Originally Posted by AngryPopTart

You could do the same trick they did with the old Offy dual port intakes. The primary barrels had seperate runners which were very small to keep velocity high, the secondaries having their own runners just below the primary runners, which were larger. You could do the same thing on an injected car. The only difference is that fuel would come after the butterfly, instead of before as on a carbureted car.

So an intake with two sets of intake runners and ITB's on the secondary (larger) runners.

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