Looking for a little more "umph" from my SC
01-06-2002, 06:11 PM
#3
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In a straight line, or around a corner? For the straight line, For around $1,200 you can install the SSI heat exchangers and a Bursch muffler. You can also bolt on headers and a Bursch or megaphones. The car will be loud as hell, and you will have no heat as the headers substitute for the heat exchangers. This is not a problem with the SSIs mentioned above.
One of the better acceleation improvements is to change the Ring and Pinion. I don't recall all the details on this, but it can be done, but it will cost you plenty. You are looking at at least 20 hours of labor to set up the new R&P, or so I have been told many times.
Now let's spend some more money...if you have a 78 or 79 SC you can bolt on the 80 through 83 heads for a little higher compression, or go to Euro heads for even more compression and HP. A Euro Fuel Distributor supposedly helps a bit as well.
If you have a 81 through 83, you can install the 78 and 79 SC intake runners, they are larger. You can also have the runners extrude honed which polishes the inside of the runners supposedly allowing for better air flow.
You can play with the cam timing, retard or advance it. Once set up supposedly gave you better low end, the other high end.
You can build a close ration 915 gear box to be run in conjunction with the lower (higher numerically) ring and pinion.
For combined acceleration and track performance improvement, the best bang for the buck is to put the car on a diet, strip out the interior, remove the air conditioning, remove the sun roof and weld the top closed. Fibreglass front and rear bumbers, aluminum hood, carbon fibre door skins, change out all the glass for light weight glass (plexiglass).
TRACK PERFORMANCE: The best bang for the buck for track performance is R rated sticky tires. The next trick for better lap times is suspension mods, too extensive to go into here, but needless to say a suspension upgrade will entail new torsion bars (stiffer), adjustable sway bars (expensive), decambered front struts, upgraded shock inserts in front and sport shocks for the rear, Turbo tie rod ends, a bump steer kit. And while you are at it, get the biggest tires and wheels that you can stuff into the wheel wells.
You could drop a 84 to 87 Carrera motor into your SC, chip the motor, add in the SSI and a Burch muffler, or megaphones, and you have about 230 HP, or better yet, drop a 993 motor into your SC. Or, supercharge your SC motor.
You can punch out the motor to a 3.2, 3.4 or 3.6 (Very expensive because you have to buy all new Mahle pistons and cylinders) and you may need to rework the heads a bit), but unfortunately, the factory CIS fuel injection doesn't work too well when this is done. It is real finiky about the volumes of air passing through it. The SC cams are very well done stock, considering they allow the motor to pull like mad from about 3,000 RPM up to red line. A cam change will only limit the flexibility of your motor. You'll get high end at the expense of low end.
There is always 6 coil crank fire ignition..that gets around the CIS problem.
Also note, now that you have created a faster car, you'll need a front spoiler and tail and you probably should consider upgrading the brakes while you are at it.
I hope the above gives you some ideas on what you can do: They will nearly all be expensive to implement. If you need a 1/4 mile speed fix, find an exotic Rent a Car company and rent an exotic a weekend...get it out of your system. If you ewant to go faster at tyhe track...get in lots of seat time the SC, bone stock, is scary fast. THis past year I have been instructing for the POC at the Streets of Willow (1.9 mile short track) track outside of LA. I have ridden in many a stock SC this past year. SCs are fast as delivered, plenty fast.
Good luck with your projects(s): I hope I have provided food for thought.
(I guess it is pretty obvious that wifey is out of town and I have absolutely nothing better to do than pound these keys sharing Porsche information. I also suggest you read Bruce Anderson's Porsche High Performance Handbook. Bruce has lots of great ideas.
One of the better acceleation improvements is to change the Ring and Pinion. I don't recall all the details on this, but it can be done, but it will cost you plenty. You are looking at at least 20 hours of labor to set up the new R&P, or so I have been told many times.
Now let's spend some more money...if you have a 78 or 79 SC you can bolt on the 80 through 83 heads for a little higher compression, or go to Euro heads for even more compression and HP. A Euro Fuel Distributor supposedly helps a bit as well.
If you have a 81 through 83, you can install the 78 and 79 SC intake runners, they are larger. You can also have the runners extrude honed which polishes the inside of the runners supposedly allowing for better air flow.
You can play with the cam timing, retard or advance it. Once set up supposedly gave you better low end, the other high end.
You can build a close ration 915 gear box to be run in conjunction with the lower (higher numerically) ring and pinion.
For combined acceleration and track performance improvement, the best bang for the buck is to put the car on a diet, strip out the interior, remove the air conditioning, remove the sun roof and weld the top closed. Fibreglass front and rear bumbers, aluminum hood, carbon fibre door skins, change out all the glass for light weight glass (plexiglass).
TRACK PERFORMANCE: The best bang for the buck for track performance is R rated sticky tires. The next trick for better lap times is suspension mods, too extensive to go into here, but needless to say a suspension upgrade will entail new torsion bars (stiffer), adjustable sway bars (expensive), decambered front struts, upgraded shock inserts in front and sport shocks for the rear, Turbo tie rod ends, a bump steer kit. And while you are at it, get the biggest tires and wheels that you can stuff into the wheel wells.
You could drop a 84 to 87 Carrera motor into your SC, chip the motor, add in the SSI and a Burch muffler, or megaphones, and you have about 230 HP, or better yet, drop a 993 motor into your SC. Or, supercharge your SC motor.
You can punch out the motor to a 3.2, 3.4 or 3.6 (Very expensive because you have to buy all new Mahle pistons and cylinders) and you may need to rework the heads a bit), but unfortunately, the factory CIS fuel injection doesn't work too well when this is done. It is real finiky about the volumes of air passing through it. The SC cams are very well done stock, considering they allow the motor to pull like mad from about 3,000 RPM up to red line. A cam change will only limit the flexibility of your motor. You'll get high end at the expense of low end.
There is always 6 coil crank fire ignition..that gets around the CIS problem.
Also note, now that you have created a faster car, you'll need a front spoiler and tail and you probably should consider upgrading the brakes while you are at it.
I hope the above gives you some ideas on what you can do: They will nearly all be expensive to implement. If you need a 1/4 mile speed fix, find an exotic Rent a Car company and rent an exotic a weekend...get it out of your system. If you ewant to go faster at tyhe track...get in lots of seat time the SC, bone stock, is scary fast. THis past year I have been instructing for the POC at the Streets of Willow (1.9 mile short track) track outside of LA. I have ridden in many a stock SC this past year. SCs are fast as delivered, plenty fast.
Good luck with your projects(s): I hope I have provided food for thought.
(I guess it is pretty obvious that wifey is out of town and I have absolutely nothing better to do than pound these keys sharing Porsche information. I also suggest you read Bruce Anderson's Porsche High Performance Handbook. Bruce has lots of great ideas.
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Superdave312 (01-13-2020)
01-06-2002, 08:43 PM
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Only buy SSIs if your stock heat exchangers are shot. Otherwise a low restriction sport muffler only is the most cost effective modification. Be forewarned that it will be louder than your stock muffler, though.
01-06-2002, 08:45 PM
#6
Don't forget about ditching CIS all together for carbs.
later,
amir (this is expensive though, haha....there's always the 930 turbo swap but then that's REAL expensive)
later,
amir (this is expensive though, haha....there's always the 930 turbo swap but then that's REAL expensive)
01-06-2002, 09:19 PM
#7
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As was posted above, "Don't forget about ditching CIS all together for carbs." You can do this, but if you live in a state with SMOG requirements, you won't pass. In CA they are very strict.
In CA, the only smog legal mods are to change the muffler and put in a high flow air filter.
In CA, the only smog legal mods are to change the muffler and put in a high flow air filter.
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01-06-2002, 10:02 PM
#8
Race Car
It's worth considering that there are a lot of $400-$2000 little steps (exhaust, fuel delivery, induction) you can take -- all of which would be dwarfed by one $6000-$7000 big step. Put a rock-solid fuel injected 3.6 in it.
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Superdave312 (01-13-2020)
01-07-2002, 12:50 AM
#10
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No chip for an SC, no computer to chip. As for air filters stick with a quality stock one. After reading up on the K&N's and so on I dont think they add any power and there are stories of them not filtering so well.
Chris
Chris
01-07-2002, 10:14 AM
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Uh, schact 993 I believe that any increase in compression 78-89 was/is acomplished via pistons not heads. The port sizes were changed(made smaller in the 80-83 to optimize flow but that doesn't affect cr) the same can be said for the 84-89 NA vs ROW, cr was lowered for NA cars via pistons.
I totaly agree with everything else posted though.
I totaly agree with everything else posted though.
01-07-2002, 01:58 PM
#13
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It is very expensive to get extra HP out of the 3.0. The factory knew what they were doing. But I know what you mean. Do some track driving and drivers ed.
Jack, you are really becomming fast on the track? Your practice seems to be paying off. I still recall the first (?) video where you went on the track and the tires had not warmed up.
Jack, you are really becomming fast on the track? Your practice seems to be paying off. I still recall the first (?) video where you went on the track and the tires had not warmed up.
