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Thread: E , S & RS performance

  1. #1

    E , S & RS performance

    there seems to be quite a bit of talk recently on various boards concerning the performance differences between 2.2 & 2.4 E & S cars.

    2.4 E 165 bhp
    2.4 S 190bhp
    2.7 RS 210bhp

    The general acceptance is a 2.4E will be quicker in a sprint to 100 than the 2.4S, I assume due to the extra low down torque of the E. Obviously a 2.7 RS will out sprint the E by quite a margin.

    Does anyone have the torque info for these cars? I'm curious to see how the torque curve varies between the S & the RS.

    I have always been under the impression the 2.4S & the 2.7RS motors are fundamentally the same except for the larger barrels & pistons & a modified MFI pump? How much difference to the torque curve does this make?

    I Know Porsche driving is not all about the 0-60 or the 0-100 sprint, but low down torque would be usufull on the track too.
    1973 2.4S
    1993 964 C2
    987 Boxster Spyder

    'hot66'
    www.ddk-online.com

  2. #2
    Senior Member
    Join Date
    Jan 2003
    Location
    UK
    Posts
    2,689
    2.4E (911/52) max torque 151 ft lbs @ 4500

    2.4S (911/53) max torque 158 ft lbs @ 5200

    2.7RS (911/83) max torque 188 ft lbs @ 5100
    Andy

    Early 911S Reg #753
    R Gruppe #105

  3. #3
    edited
    1973 2.4S
    1993 964 C2
    987 Boxster Spyder

    'hot66'
    www.ddk-online.com

  4. #4
    Senior Member
    Join Date
    Jan 2003
    Location
    UK
    Posts
    2,689
    Took the info from Bruce Anderson's book - thought it a bit strange at the time but didn't check other sources...

    - have edited my original post accordingly.
    Andy

    Early 911S Reg #753
    R Gruppe #105

  5. #5
    Dema Elgin (elgin cams in redwood city california) has developed a modified S Cam grind that is supposed to give you E like torque at lower RPM without giving up the HP peaks in the upper revs. I just put it into my 2.4S rebuild (see other posts). I'll let you know how it goes after breakin, but of course I'll need a stock E volunteer to benchmark with.
    Chris Purpura @civilizedmisfit
    ___________
    Member #479
    72T aka The "Civilized Misfit" Build - Helicopter Cooled! See: https://www.excellence-mag.com/issue...vilized-misfit
    2019 911 Carrera GTS (sold, no regrets)
    73S - #1100 (restored and now somewhere in Europe &#128546
    1997 993 Carrera 4S Black on Black (sold &#129394

  6. #6
    yopurp;
    your cams sound like a good compromise.
    would love to see your car in person since I am also in the bay area.

  7. #7
    A picture is worth... well you know.

    If you look at the graph you'll notice that the 2.7RS torque curve sits right in the middle between the 2.4E and the 2.4S due to it's increased displacement dispite having the same cam as the 2.4S.
    Attached Images Attached Images  
    Bobby
    71' Olive 2.2E Targa / Early S #491

    I've always considered the glass to be half full...that is until I reached middle age and realized that it is actually half empty.

  8. #8

    Talking

    thanks for the graph. Interesting the torque for the E & S is so similar at the lower rev range
    1973 2.4S
    1993 964 C2
    987 Boxster Spyder

    'hot66'
    www.ddk-online.com

  9. #9

    Elgin cams

    Dema has a cam grind that I am going to try on my 68S. He says it's between a S cam and a 906. He has a dyno chart that shows 20 HP gain. Hard to believe, but these early 2.0 S's have 9:8-1 compression so it's possible I guess. Here is this weekends progress on the motor.
    Attached Images Attached Images  

  10. #10
    Rick - wow what a pretty block.

    SCargo - I'm in Menlo Park so San Carlos is just up skyline a wee bit. We should hook up. Send me an email when my car is done (week after next if all goes right).

    My understanding on the Elgin 'Modified S grind' is that the lower end curve is slightly higher than an E, and that it peaks out a tad over a stock S at the upper end. With adding my 2.2S pistons, I'm hoping to get closer to the RS curve above. Anyone in Norcal got a Dyno we could try it on in a few months (after brake in)? We'll also need a stock E, RS, and S to compare. Hmmm, sounding like...fun run?
    Chris Purpura @civilizedmisfit
    ___________
    Member #479
    72T aka The "Civilized Misfit" Build - Helicopter Cooled! See: https://www.excellence-mag.com/issue...vilized-misfit
    2019 911 Carrera GTS (sold, no regrets)
    73S - #1100 (restored and now somewhere in Europe &#128546
    1997 993 Carrera 4S Black on Black (sold &#129394

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