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Old 10-04-2009, 04:19 PM   #1
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The 02's seems to be controlled the same. The T is attached to the "butterfly" unit with a few longer bolts. Thought someone here may have some experiance on this.
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Old 10-05-2009, 09:41 PM   #2
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Originally Posted by Jaak
The 02's seems to be controlled the same. The T is attached to the "butterfly" unit with a few longer bolts. Thought someone here may have some experiance on this.
I had thought that up to 03, the intake "T" plumbing are the same and that after 987 series the intake "T" has the internal baffling/routing just behind the throttle body and the controlled butterfly at the "T". this is not the same as the throttle body butterfly.
picture shows the baffling/routing along with butterfly at the junction
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Old 10-06-2009, 08:48 AM   #3
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It's king of hard to compare both systems in any of the drawings I have seen. maybe someone who has worked on both can add to the discussion.
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Old 10-08-2009, 06:11 AM   #4
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It's king of hard to compare both systems in any of the drawings I have seen. maybe someone who has worked on both can add to the discussion.
picture below shows side by side of the intake plenum. the part that I was focusing in is the additional butterfly in the plenum in the "T".
it's opeation is controlled by electronics and vacuum. I don't think 986 ECU has this feature and therefore compatibility problem
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Old 10-08-2009, 06:49 AM   #5
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I got the unit installed in my MY03 base a few weeks ago. Did a bunch of timed runs in 4th gear from 2000 to 4000 RPM both before and after over the same road within about an hour of each other in the middle of a sunny day. The times averaged 3/4 of a second faster after the install. Haven't seen a downside to it yet - did a DE event on the 26th and really noticed the extra acceleration.

Now for the "seat of the pants" stuff: seems like the engine idles more smoothly, very low end torque seems better - less likely to stall from a standstill, maybe has a little bit more "growl" during acceleration (or maybe it's just the mind playing tricks).
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Old 10-08-2009, 04:39 PM   #6
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I got the unit installed in my MY03 base a few weeks ago. Did a bunch of timed runs in 4th gear from 2000 to 4000 RPM both before and after over the same road within about an hour of each other in the middle of a sunny day. The times averaged 3/4 of a second faster after the install. Haven't seen a downside to it yet - did a DE event on the 26th and really noticed the extra acceleration.

Now for the "seat of the pants" stuff: seems like the engine idles more smoothly, very low end torque seems better - less likely to stall from a standstill, maybe has a little bit more "growl" during acceleration (or maybe it's just the mind playing tricks).
Good information, Dave! Do you know the length of the "run" or the speeds at start / finish for the distance?
How do you feel about price vs results?

Bob
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Old 10-10-2009, 07:01 AM   #7
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Good information, Dave! Do you know the length of the "run" or the speeds at start / finish for the distance?
How do you feel about price vs results?

Bob
It's a simple install. Didn't take long and for the money it's low on the cost for benefit in my book (at least for a Porsche ). Not sure on the speeds or distance, I was so intent on watching the tach with my passenger to make sure the timings were as accurate as possible. Ran the same road in the same direction for all of the runs trying to keep the variables down. Did 7 runs both before and after to make sure I was getting good timings.

A dyno would have been nice... but I don't have access to one. This is the best I could think of to try to take a reading on if there was an improvement.
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Old 10-09-2009, 06:28 AM   #8
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I would hypothesize that this could be made to work for owners of 03-04 cars by installing the necessary plumbing and electrical connections and flashing the DME to a 9X7 map. Highly doubt it's worth all the headache, however.
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Old 10-08-2009, 09:16 AM   #9
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Quote:
Originally Posted by sb01box
picture below shows side by side of the intake plenum. the part that I was focusing in is the additional butterfly in the plenum in the "T".
it's opeation is controlled by electronics and vacuum. I don't think 986 ECU has this feature and therefore compatibility problem
Thanks ... one can see that they are not compatible. Was hoping though ....
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