993 Faq

I’m finally published! Well sort of..

Here is Adrian Streather’s book ( ISBN:1904788947 ) for the Porsche 993. Great job Adrian!

Your truly has some photos of mach-zehnder my polar silver 993 turbo in there.

Here is a link to the book on amazon!

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Here is an excellent site on how to modify your turbo:

993 Twin Turbo Mods

You can use the CDR220 from the Boxter/996 in your 993.

In order to do so, you will need to update the face plate so you can see the display. It’s polarized for the boxter/996 and you will not be able to see it in the 993.

The cost is $50. Contact the part deptartment of Becker here:

While you are at their site, you can order an AUX IN cable and also the removal tools.

You may notice the following problems:

a) steering wheel vibration at freeway speeds which only occur at certain speeds but not others
b) steering wheel vibration under braking

The first thing to check are:
a) Your tire pressures
b) Your wheel balance. You could have lost a wheel weight or your wheels were not properly balanced in the first place. Be sure you use a shop which has the Hunter GSP 9700. More information is here

Here is an excellent article by Steve Weiner at Rennsport Systems regarding carbon buildup issues. This includes valve guide wear and exhaut port problems.

Rennlist Discussion Forums - OBD-II CEL : Carbon buildup issues (long)

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Muffler bypasses pipes bypass the muffler all together. They replace the almost 2 feet of tubing and sound deadening material in the muffler.

For turbo cars, the difference is quite dramatic. In addition they save about 20 lbs off the back end of the car. Throttle response and power are noticable increased.

However, the increased noise may not be for everybody. In the Fabspeed muffler bypass pipes I used for my turbo, there was slight responance from 2800-3000 rpm.

For normally apirated cars, I imaging that difference would be less dramatic, although you would get the same amount of exhaust noise as a turbo.

In the 993 RS cars, there was only 1 pulley which drives the alternator and fan. In normal 993 cars, there are seperate pulleys.

If you are changing your belts, I would strongly recommend upgrading to the single pulley instead. Instead of spending $60 for the updated pulley halves, you could spend $100 and get the RS pulley instead.

Advantages:
Easier to replace the fan belt if it should break. Can _actually_ be done roadside because it uses ordinary metric bolts instead of impossibly small 5 mm allen head bolts.

Usually, when the alternator belt breaks, it takes out the other 2 belts ( fan/AC ) With 1 less belt, this possibility is reduced.

Cleans up the engine bay

Disadvantages:
Spins the alternator _slightly_ slower. So there is a therotical decrease in charging time. However, of the many people on the board who have done this, none have had any charging issues.

Here’s a link to an alterantor DIY that we did where we also upgraded to the RS pulley.

RS pulley DIY

Note the dremel’ing that we had to do to get the existing setup off. If you look at the final pic, you’ll see that there are just standard hex head bolts which hold the fan belt pulley in place instead of those $%#^Q&* 5 MM allen bolts.

You can just imaging how impossilbe that would be if you had to do that roadside in the night.

Written by Bay Area legend Hank Watts. He is currently very active in the local PCA GGR ( Golden Gate Region ) club.

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In addition to Robin’s information for an oil change on a NA (normally aspirated ) 993, I’ve created some additional specific for Turbo cars.

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You can quickly and easily modify your airbox cover to increase induction noise.

See this DIY: http://www.pcarracing.homestead.com/airbox.html