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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.
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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
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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.
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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. :D
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yopurp;
your cams sound like a good compromise.
would love to see your car in person since I am also in the bay area.
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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.
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thanks for the graph. Interesting the torque for the E & S is so similar at the lower rev range
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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.
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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?:D