Performance Potential for 993 C2 or C4?
03-17-2004, 05:23 PM
#31
NISL-
First, I would look into what you want to do with the car. Porsche's like the N/A 993 are great road racing cars, and a 450 bhp N/A 993 on the track is a BEAST. Some of the guys in the modified classes in PCA can tell you how fast of a race car that is. A this point, you'd want to look harder into yoru suspension and gearing.
Another thing to consider is the $$$ involved in going into a 911 engine.
If you are getting into road racing, it's a great car to drive (really any 911, for that!)
First, I would look into what you want to do with the car. Porsche's like the N/A 993 are great road racing cars, and a 450 bhp N/A 993 on the track is a BEAST. Some of the guys in the modified classes in PCA can tell you how fast of a race car that is. A this point, you'd want to look harder into yoru suspension and gearing.
Another thing to consider is the $$$ involved in going into a 911 engine.
If you are getting into road racing, it's a great car to drive (really any 911, for that!)
03-17-2004, 07:37 PM
#32
Burning Brakes
500+ hp NA motor
Do yourself a favor buy a turbo car. I am also from the hot rod background and I know some of these people on the board may seem snooty. The reality is that a NA motor won't see more than 400 HP and be streetable. Also consider Porsche are expensive to build. You think that starting with a lower price car allows more upgrades, but it really don't. A turbo car has stronger rods, better cranks, better heads ect.. Think the difference between a truck 454 and a LS7. The LS7 has larger rods, square port heads, 4 bolt main ect... If you start with a Turbo all you have to do is increase fuel, size up turbos, increase boost and 500+ is yours. Be careful the air cool cars overheat with lots horsepower. The car will need new oil coolers. Some on this thread said thalk to Stephen, and I agree he knows his stuff. Consider Promotive they build crazy high HP engines and copy what they do. This DIY is still gonna cost you for the parts.
03-22-2004, 01:47 PM
#33
Three Wheelin'
Why you can't get 500hp out of NA
NISL,
I'm probably about to tell you stuff you already know, but here are the basics. An engine is an air pump. Power is a function of how much air you can pump. There are 3 ways to pump more air:
1) more cubes (corvette)
2) more RPMs (Honda S2000)
3) more air artificially (Porsche Turbo)
The first limit is the size of your basic pump (# of cubes). You can only get so many HP/Liter with an N/A engine at a certain RPM. A higher performance N/A engine doesn't produce a LOT more torque at 4k RPMs. It produces a lot more at 6k.
Sure there are cams and heads and such, but that's really more about RPMs (making the pump more efficient at higher RPMs). You don't get a faster quarter mile with more torque between 2k and 3k RPMs.
Let's say a street N/A engine can realistically make about 80 HP/liter before going to exotic titanium rods and such (that number is close enough). So a 5.7L chevy engine could make 450hp with some serious heads, etc. The equivalent work on a 3.6L Porsche is going to get you 290HP (Porsche is basically already there from the factory, that's why there is so little room to upgrade). With two valves, no one is going to make a motor much more than 100hp/Liter (how many N/A chevy's are making 570hp?) for more than a few hours at the track anyway (you need a LOT of RPM's). More RPMs = $$$$.
Artificial aspiration is the way to go. It's cheaper and way more drivable. You ever driven a really hyped up N/A engine? Coming on the Cam is way worse than any turbo lag. Besides turbo lag is easy as pie to eliminate, just keep the RPMs up.
A good turbo setup for a 993 will cost you $30k and you don't get all the nice stuff you'd get with a 993tt.
-dc
I'm probably about to tell you stuff you already know, but here are the basics. An engine is an air pump. Power is a function of how much air you can pump. There are 3 ways to pump more air:
1) more cubes (corvette)
2) more RPMs (Honda S2000)
3) more air artificially (Porsche Turbo)
The first limit is the size of your basic pump (# of cubes). You can only get so many HP/Liter with an N/A engine at a certain RPM. A higher performance N/A engine doesn't produce a LOT more torque at 4k RPMs. It produces a lot more at 6k.
Sure there are cams and heads and such, but that's really more about RPMs (making the pump more efficient at higher RPMs). You don't get a faster quarter mile with more torque between 2k and 3k RPMs.
Let's say a street N/A engine can realistically make about 80 HP/liter before going to exotic titanium rods and such (that number is close enough). So a 5.7L chevy engine could make 450hp with some serious heads, etc. The equivalent work on a 3.6L Porsche is going to get you 290HP (Porsche is basically already there from the factory, that's why there is so little room to upgrade). With two valves, no one is going to make a motor much more than 100hp/Liter (how many N/A chevy's are making 570hp?) for more than a few hours at the track anyway (you need a LOT of RPM's). More RPMs = $$$$.
Artificial aspiration is the way to go. It's cheaper and way more drivable. You ever driven a really hyped up N/A engine? Coming on the Cam is way worse than any turbo lag. Besides turbo lag is easy as pie to eliminate, just keep the RPMs up.
A good turbo setup for a 993 will cost you $30k and you don't get all the nice stuff you'd get with a 993tt.
-dc
05-04-2004, 06:39 AM
#34
Burning Brakes
Lets cut to the chase, just get a Carrera GT - by the time you've finished with a 993 you will have spent the same money to get the same performance.
Alternative get a 935 or a 993 Cup car and really learn to drive it. HP is not the king of the hill, its a combination of all the things that go to making a great car - and of course the most important component, the nut behind the wheel!
PJC
Alternative get a 935 or a 993 Cup car and really learn to drive it. HP is not the king of the hill, its a combination of all the things that go to making a great car - and of course the most important component, the nut behind the wheel!
PJC
