Quote:
Originally Posted by BrokenLinkage
But does the 550 SE have a special tune to reflect the use of the 987 airbox & maf/holder? If so, can this tune be used with a five chain engine (ie my 2001s)?
It then uses the same throttle body diameter as any other S, with the same plenum & intake manifold as stock?
Am I correct in thinking there is not much benefit in reducing the restriction in one part of the intake, if it is left in place elsewhere? (Like the rate-limiting-step in chemistry). So if I am not on board with drilling new mounting points and installing the 996 intake manifold, with the attendant use of the 987 engine cover and loss of the rear shelf speaker bar, then this is pretty much a waste of time?
Or can I pick u a few horses just using the 987 airbox, modded to fit the stock MAF, plus a larger throttle body, without a retuning of the ECU?
Thanks everybody for sharing your knowledge with those of us lower on the ladder of flat six enlightenment.
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Yes the 550 has a special tune & a 7.8 DME so you must have the 7.8 DME to use it.
T/B & plenum are standard size.
I believe the larger intake hose will help even with a slight diameter reduction midway.
You can install the whole 996 intake manifold & lower the engine mounts for clearance.
987 airbox will flow roughly double the amount of air as the 986 airbox, + any other enhancement parts. DME must be programmed with correct MAF tube diameter in order for MAF to calculate intake air volume. If diameter stays the same reprogramming is not required.