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    Mar 25, 2005 12:23:41 PM

    Thas
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    Thas
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    Drag coefficient - manual vs tiptronic

    I don't know if it was discussed earlier, but why has a tiptronic boxster bigger drag than manual one? (maybe different underbody panel?)

    Thas

    Mar 25, 2005 12:31:20 PM

    FutchM
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    Futch
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    Reply to: Thas

    Re: Drag coefficient - manual vs tiptronic

    Quote:
    Thas said:
    I don't know if it was discussed earlier, but why has a tiptronic boxster bigger drag than manual one? (maybe different underbody panel?)

    Thas



    Additonal central radiator.

    Mar 25, 2005 7:19:35 PM

    Thas
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    Reply to: FutchM

    Re: Drag coefficient - manual vs tiptronic

    Can you tell me where it is located on the car? Thanks.

    Thas

    Mar 25, 2005 8:20:09 PM

    Freak 2
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    Reply to: Thas

    Re: Drag coefficient - manual vs tiptronic

    In the middle of the front bumper !!

    Mar 25, 2005 8:41:58 PM

    Thas
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    Reply to: Freak 2

    Re: Drag coefficient - manual vs tiptronic

    You mean the air intake? Ok, sorry Till now i thought that the number of the air intakes depends on that the actual car is a Boxster S 3.2 or a standard Boxster 2.7

    Thas

    Mar 25, 2005 8:59:23 PM

    Freak 2
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    Reply to: Thas

    Re: Drag coefficient - manual vs tiptronic

    You were right !! The 3.2 S has 3 frontal air intakes, the 2.7 has "only" 2. The central air intake comes only with the 3.2 S, so IMO, the extra cooler (normally mid mounted) for the Trip in a base 2.7 will get cooling from the (2) side frontal air intakes, IMO, no diff in Drag Coeff here.

    Mar 25, 2005 9:11:27 PM

    Thas
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    Thas
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    Reply to: Freak 2

    Re: Drag coefficient - manual vs tiptronic

    There is a difference! That why i started this topic. Check out Porsche's website:

    Boxster 2.7 maunual 0.29
    Boxster 2.7 tiptronic 0.30 (!!!)

    Boxster S 3.2 manual 0.30
    Boxster S 3.2 tiptronic 0.31 (!!!)

    So, the question is why the tiptronic transmission increases the drag?

    Thas

    Mar 25, 2005 9:23:12 PM

    Thas
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    Thas
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    Reply to: Thas

    Re: Drag coefficient - manual vs tiptronic

    Hm, ok i think i understand now. On the S version with manual, the center intake is "empty", and with tiptronic, there is an extra cooler (0.30 vs 0.31), it's ok.

    The 2.7 version is still confusing, becouse if the tiptronic's cooler uses the side intakes, the area of the intakes is the same, so where's the extra drag?

    Thas

    Mar 25, 2005 9:55:03 PM

    Dr. Phil Offline
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    Reply to: Thas

    Re: Drag coefficient - manual vs tiptronic

    This sounds very strange.
    Why would the tiptronic car need an extra cooler?
    It's more likely something to do with the underbody...some extra panel or so that causes the extra drag.

    Mar 25, 2005 10:00:38 PM

    Freak 2
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    Reply to: Dr. Phil

    Re: Drag coefficient - manual vs tiptronic

    Maybe you are right about the underbody Dr Phil, but I'm sure about the extra Trip Cooler, because it has already been mentioned on this board.

    Mar 25, 2005 10:52:05 PM

    Dr. Phil Offline
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    Reply to: Freak 2

    Re: Drag coefficient - manual vs tiptronic

    Ok, but again: Why would the trip tranny call for an extra cooler??
    Doesn't make sense IMO.

    Mar 25, 2005 10:59:05 PM

    Carlos from SpainM
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    Reply to: Dr. Phil

    Re: Drag coefficient - manual vs tiptronic

    Quote:
    Dr. Phil said:
    This sounds very strange.
    Why would the tiptronic car need an extra cooler?



    Fritz explained it for us very well a few of days ago if I recall. The Tiptronic hydrolic torque converter is not as mechanically efficient as the manual, there is more power loss from the engine to the wheels, and that power loss generates more heat, its is tranformed into heat, so need extra cooling. Just like the GT3 engine needs a third radiator becuase of the greated overall power it generates so proportionally it also generates more heat.

    Mar 25, 2005 11:11:06 PM

    fritz
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    Reply to: Carlos from SpainM

    Re: Drag coefficient - manual vs tiptronic

    Quote:
    Carlos from Spain said:
    Quote:
    Dr. Phil said:
    This sounds very strange.
    Why would the tiptronic car need an extra cooler?



    Fritz explained it for us very well a few of days ago if I recall. The Tiptronic hydrolic torque converter is not as mechanically efficient as the manual, there is more power loss from the engine to the wheels, and that power loss generates more heat, its is tranformed into heat, so need extra cooling. Just like the GT3 engine needs a third radiator becuase of the greated overall power it generates so proportionally it also generates more heat.



    Thanks, Carlos! I didn't feel like having to cover that ground all over again so soon!

    Mar 26, 2005 12:03:02 AM

    Dr. Phil Offline
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    Reply to: fritz

    Re: Drag coefficient - manual vs tiptronic

    Thanks Carlos
    Strange with that much extra friction and heat.
    Guess that makes it Manual 1 - Tiptronic 0

    Mar 26, 2005 2:34:53 AM

    rpspa
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    Reply to: Dr. Phil

    Re: Drag coefficient - manual vs tiptronic

    Perhaps it means "emotional" drag..realizing they have an automatic transmission. Just a thought

    Mar 26, 2005 1:44:17 PM

    Dr. Phil Offline
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    Reply to: rpspa

    Re: Drag coefficient - manual vs tiptronic

    Quote:
    rpspa said:
    Perhaps it means "emotional" drag..realizing they have an automatic transmission. Just a thought



    Hehehe...that would be a great yardstick for future measurements.
    0 - 100 in 2.3 seconds...emotionally
    My Boxster has 400 emotional BHPs


    Mar 27, 2005 10:37:37 AM

    Tool Pants
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    Reply to: Freak 2

    Re: Drag coefficient - manual vs tiptronic

    For the 987 with a tip Porsche did what they did to the 996 with a tip. Put a transmission cooler in the front of the car. The 986 did not need this because there is a cooler on the transmission and the power plant is reversed compared to a 996.

    987 now has the cooler in the front of the car and it catches air.
     
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