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Here is the real deal!! LooooonG (archive)

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Posted by Peter on February 07, 2000 at 14:44:49:

In Reply to: Re: anyone have a 1/4 time for a Dinan SC'ed M3 posted by Paul E on February 07, 2000 at 11:09:20:

There seems to be a misconception about the differences of the 3.0L motor and the 3.2L motor.
after reviewing some paper work and checking out some dynojet runs of both 3.0s and 3.2s before and after SC'ing l found what l originally thought was the case.....l will try to scan them in and post them but for now here are the numbers and descriptions of the runs.... all runs are at the wheel figures.

For the 3.0L @ 69 deg.F
Stock HP = 205.3 HP @ a range from 5500 to 6500
Stock TRQ = 208.6 lbs @ 4300

For the 3.2L @ 84 deg.F
Stock HP = 200.4 HP @ 6150
Stock TRQ = 211.6 lbs. @ 4000

Now for the Supercharged figures

For the 3.0L @ 65 deg.F
SC'd HP = 304.7 hp @ 6500
SC'd TRQ = 255.7 lbs. @ 4800

For the 3.2L @ 50 deg.F
SC'd HP = 289.4 @ 6500
SC'd TRQ = 256.6 @ 3900

All dynojet pulls were done at ERT in Delaware. Looking at the numbers you can see why the claimed to fame power advatage of a 3.2 over a 3.0 is not only non-existent but its actually the other way the stock pulls the 3.0 had the cooler temp advatage, so given the same temp..the 3.2 would probably pull similar HP numbers but the 3.0 still puts out peak HP for a 1000rpm range while the 3.2 peaks for a moment and then drops....and torque figures are surprisingly close. advantage goes the the 3.0s top end pull...(which is what counts)
In supercharged format the the temperature advantage goes to the 3.2L and the 3.0L still pulls 15hp more and only loosed out on torque by less than one pound. By looking at the curves, the 3.2L power curve looks like a rollercoaster up top in SC'd form...not smooth at all...probably due to the restrictive manifold is having a hard time dealing with the all the extra air coming in. The 3.0Ls free flowing int.manifold flows smoothly all the way to the top and this is the reason for the difference in power. So to sum it up....SC'd 3.2 is not faster than 3.0.....other way around if anything!!!!! Hope this sheds some light on the subject


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