Auto_Werks 3.6

Really streetable is in the eye of the beholder.... Many porsche owners would say the car is not streetable if you can't get 20+mpg and drive around town in 5th gear with the ac on etc etc. Right now I'm running a 350 chp 3.6 with ITB injection and 3.8 RSR heads and cams. It is a handful on the road. it is not smooth below 3k depending on how you apply the throttle, and it makes almost all its "go" above 4k. No reasonable engine builder would recommend what I have for the road, but I enjoy it. Right now the biggest problem I have with the car is the 60/40 blend of race gas, and sub 10 mpg economy. I have to think some of that can be tuned out at cruise.... I think that's the whole point of the ITB injection vs PMOs or similar carbs. If you like high strung N/A engines then go for it. Don't forget you will probably spend some $$$ beefing up the bottom end of the engine as well. You would almost certainly have more money doing the upgrades yourself than selling your car and starting with a pleasantly modded 930. However, that is a different animal entirely.

Edgy01

Many years ago i purchased a lightly modified 911SC that had been turbocharged with a Rayjay turbo. This was a fairly common kit in those days. The car was a 1981 SC with whatever the compression ratio was in those days. With a modest 6 lbs of boost, the car produced about 270 hp. With the stock 915 tranny (5-speed) it would easily hit redline in 5th gear which on the speedo was about 162 mph. It required substantial octane to keep from premature detonation. (I routinely ran it on superunleaded along with a can of ST104). One day I experienced a bad thing,--clearly not enough octane. Piston #6 melted and rings were broken. I put all the oil I had in the trunk (4 qts) and nursed it some 80 miles home. Despite appearing like a mosquito abatement truck at times, it made it.

We tore it down and started all over again with new Ps and Cs and this time shimmed out the cylinders a bit further to lower the effective compression ratio. Also peened into the piston head were 930 turbo oilers. It came together well, effectively eliminating the need for the ST104 additive in every tank. It now ran well on super unleaded. After extensive work, the distributor was relined and it ran extremely well. It still hit redline in 5th and was certainly hitting the 270 hp mark,--at least.

Today, I drive a fairly stock 06 997S 3.8 with an advertised HP of 355. I have had it at 180 mph on the autobahns. Gearing is certainly different today. But sometimes I feel that that turbo from the 1980s had more power,--perhaps its the rush from the turbocharger. I don't know. But it was very fast.

Other things done to that car were quite limited. It had a Carrera RSR pressure plate (to handle the extra power) and a 934 whale tail (smaller than the intercooler-containing whale tails of 1978 and up). Brakes were still stock SC but with Metalmaster pads. Rims were 7 and 8 16s. It was a hell of a car. It had no 'emissions' equipment at all. From the turbocharger was a length of exhaust pipe that was bent 180º from the T/C, occupied the space of where once was a muffler, and then the exhaust exited from the usual left hand side. At night you got quite a light show, so I was told.

For you to reach 300 hp just can't take that much effort from a 3.2. Perhaps a turbo kit can do the trick. Just need to find one for a Motronic system. (Mine was obviously a CIS. I had to GE silicon shut the pop-off valve or it would never develop boost).

Ed Hughes

My cams make mine a beyotch in stop and go traffic. But, give me open road, and it is HIGHLY streetable.

DonMo

How about trying a Renegade LS1 into any Pcar. Will get you 400 HP with a lighter engine and keep some of the Porsche handling charachter. You could actually sell the Pcar engine and pay for the the turbo tranny and LS1 upgrades. I personally wouldn't do it but do a search, it has been done and reported here on Pelican.

Tippy

My car is very streetable...........well, was streetable (money shift)......

SC cams and 1 bar boost on a 3.2 equals 427 whp......that should do the trick.

drmatera

Tippy, is, or was, your 3.2 stock or did you lower the compression? like to see some pics of your setup

Darin

Tippy

I have 3.3L 930 jugs and slugs. So, it has like 7:1 compression or so.

Like I said, besides the 930 jugs/pistons, it only has SC cams in it and of course the bigger injectors (380 cc Bosch).

Even the computer is stock along with the mass air meter except for the custom burned chip.

I daily drove it for 3 months (75 miles round trip) until I got a DD. It is sluggish without boost but a hand full under boost (too violent at times) - sometimes spinning in 4th with the old tires I had.

2nd gear is almost useless under boost, 3rd and 4th will spin depending on road and temperature.

r911

Ed, what cams do you have?

- what induction?

Ed Hughes

DC19 from DRC is my profile. A bit hotter than 964. Anything longer than 5 or 10 minutes in traffic and she starts to buck.

Stock 3.2 intake, semi-aggressively chipped.

Tango635

An oldy (thread) but a goody.

porsche0nut

I just read through... on page 4 I was getting anxious thinking that I was going to hear about some grand conclusion or read about an awesome engine build... and then suddenly the next post jumped 7 years into the future! What did Roamer end up doing?

The story needs an ending! (with pictures...)

drmatera

Roamer couldn't take the long drawn out process of building a high HP N/A motor so he quit and joined the Circus

raspberryroadster

SUPERCHARGER.....i agree with steve, adding forced induction to a (from the factory -naturally aspirated car) is always a challenge.
especially with porsche because of high compression ratios heat management becomes a real issue. normally turbos/s'charged cars will have forged internals/race studs and lower compression set ups.

for much less $ then adding hp gain i agree with other posters, focus on absolute weight reduction, suspension, or else buy a more powerful car. general rule of thumb (unless you are absolute diy guy with shop capabilities) its cheaper to buy power on the hoof than to modify the existing steed....imo

pete917

I built a 3.5l Mahle engine. Its Naturlly aspirated and provides 326bhp. Its very streetable too.

Ed Hughes

I hope to get within 25hp of this with 3.4L.