Jerry, those run sheets show rwhp. Isn't the stock SC rated at 190?

Mark:
Did you have the torque curves also for the tests. I posted mine charts as a basis of comparison. I would hope you show the mid torque gains suggested by RoninLB. Your HP really only shows up at about 5300 RPM, else, it's a pretty standard SC curve.

Also, what is the CR on the 79 SC?
Thanks!
Pat

before
http://forums.pelicanparts.com/uploa...1128082703.jpg
after
http://forums.pelicanparts.com/uploa...1128082741.jpg

Mark:
Nice little kick in the 3-4 range. How is that on driveability?
Pat

The stock SC in the US was always rated at 172 HP SAE net. That would be something like 146 RWHP for a stock Motor, assuming a 15% driveline loss. Even at 10% it would only be 155 RWHP. That's why I assume the shop applied a correction factor. No one wants to see low HP numbers.

Regards,

Jerry Kroeger

From what I have heard, Porsche rates the HP of engines at the minimum allowable HP they can have when leaving the factory. In essence, my 78SC will have a minimum of 172 HP. Also, I have not ever seen any documentation to support the 15% driveline loss; many observers feel the loss is under 10%...there really isnt much driveline.

Pat,
I can't say that I "felt" a huge difference after the install. If anything, the power comes on more smoothly than before - just as roninlb posted, it filled in the curve.
M

Peak horsepower only matters if you spend most of your time driving at or near top end. Few of us do that.

SSI's give about an extra 30 ft-lbs at 3000 RPM, according to an early version of Bruce Anderson's book. This is where you drive the car, if you are like most people.

I put SSI's on a very stock 82 SC. They transformed the car from underpowered to drivable. I can't imagine having an SC without this modification. My 88 Carrera has a stock exhaust system, but the 3.2 with higher compression is just a torquier engine.

I'd imagine that SSI's on a stock SC will give it comparable 0-60 numbers to a stock 84-86 Carrera.

I put SSIs and a two-in one-out Bursch muffler on my otherwise stock (engine) 1981 SC. The big difference to me is the mid-range improvement. It is much easier to pass other cars than before. The car kinda "brightened up" after the install. When I'm willing to spend more money, I'll try a different muffler (perhaps a Monty) to see if I feel any difference.

There aint no way that SSIs will give you an extra 30 ft. lbs. of torque at 3000 rpm.
No way, no how. Not even if god himself puts it in a book.

You might see an increase of 1/10th of that, maybe slightly more.

No one is saying there isn't an improvement, some of us are just trying to keep it from exaggeration and to keep the $$$ per hp in perspective.

Mark,
Am I reading those correctly that your torqu actually dropped from 161.8 to 159.5?

I read it either in one of BA's books/Excellence, or PANO.