What are the MUST mods/improvements for 911SC?

[3rd_gear_Ted]

Full Monty:
3.6L swap
Turbo flares front & rear
993 Mirrors
964 or IROC nose

[shoooo32]

Regarding original/unmodified cars, I got my '78 SC with 170k miles and it had a lot of needs. Not being content to leave things stock, I made small "improvements" and upgrades to every system of the car. Because it was done incrementally, it was tough to judge how far the car had come over six years. However, last year I scored a creampuff '83 SC for my dad that had 51k miles and lived in a climate controlled collection its entire life. I assumed based on condition that it would be an amazing driving experience.

Nope, it kinda sucked. compared to my hotrod '78, it was underwhelming as a sports car. Dad, having driven both cars, wanted to perform most of the "must have" mods outlined in this thread. So we've done a top end rebuild (because head studs) with William Knight's M1 cams, RSR flywheel, SSIs and a M&K muffler. Between the motor, Rennshifter and 7/9x16 Fuchs (the new German ones), it drives like a different car. Huge props to William - those cams rock! It still needs turbo tie rods, stiffer torsion and sway bars, but it's infinitely more exciting to drive already.

[QueWhy]

Originally Posted by GH85Carrera

No, it says 4 cycle engine, not four cylinder. That is the official Porsche spec sheet. They are always conservative of HP and performance figures. Unlike many manufacturers of the time that would flat out lie about HP or torque.

You're right. Better eyes than me.

[Jonny H]

Well this is how I ended up starting Classic Retrofit! After SSI's and some 964 cams, I was after more reliability and some comfort.

A more reliable fusing system
A tunable CDI box
A lightweight A/C

[schoward]

I'll add some easy overlooked ones that are musts based on bang for buck and effort to install... I would call them 'upgrades' vs mods...

Upgrade to OEM Cabriolet or 'Sport' motor mounts. Don't have to go extreme Wevo or anything - German OEM/Porsche fine. Noticeable reduction in engine deflection (esp. on hot days) and slightly crisper throttle response. Cheap and easy.

Delrin bushing or upgraded Shift coupler (and then properly adjusted shifter).

Afternoon bolt-ins that don't break the bank, don't butcher an otherwise nice stock car and last forever...

Scott

[Bill Douglas]

My SC has the 930-10 ROW engine with SSIs. The engine had been stripped down and professionally balanced. It is a very revy engine and very smooth.

[Bucketlist]

Just read my signature, all of these work together to make an excellent preforming SC.

[87maniac]

For not much $$$ an amazing visual improvement.
of course, the pop off valve and Carrera tensioners are no=brainers.

7" x16 front and 8"x16 rear. (or 9" rear, same visual)
--OR ---
keep the stock 7" rear fuchs with with a bolt on spacer to bring it out.
(??? 21mm??? )

[icarp]

Originally Posted by shoooo32

Regarding original/unmodified cars, I got my '78 SC with 170k miles and it had a lot of needs. Not being content to leave things stock, I made small "improvements" and upgrades to every system of the car. Because it was done incrementally, it was tough to judge how far the car had come over six years. However, last year I scored a creampuff '83 SC for my dad that had 51k miles and lived in a climate controlled collection its entire life. I assumed based on condition that it would be an amazing driving experience.

Nope, it kinda sucked. compared to my hotrod '78, it was underwhelming as a sports car. Dad, having driven both cars, wanted to perform most of the "must have" mods outlined in this thread. So we've done a top end rebuild (because head studs) with William Knight's M1 cams, RSR flywheel, SSIs and a M&K muffler. Between the motor, Rennshifter and 7/9x16 Fuchs (the new German ones), it drives like a different car. Huge props to William - those cams rock! It still needs turbo tie rods, stiffer torsion and sway bars, but it's infinitely more exciting to drive already.

Shooo, It is very important to install a adjustable fuel pressure regulator , and AFR gauge . These need to be mounted in the cockpit . This is the only way you take advantage of the power potential of the M1 cams.
Ian

[MichaelSJackson]

popoff valve - to protect the CIS airbox
chain tensioner safety collars - to prevent serious damage if/when tensioners fail
SSI heat exchangers - to improve exhaust/HP and maintain heating
turbo tie rods - to make steering more responsive
better brake pads - wide selection, so pick those that are appropriate for your intended usage

After that take your time and figure what your goals really are. It can be expensive to backtrack a hasty decision.

Remember, it was already a Porsche 911.

[Reiver]

Originally Posted by icarp

Shooo, It is very important to install a adjustable fuel pressure regulator , and AFR gauge . These need to be mounted in the cockpit . This is the only way you take advantage of the power potential of the M1 cams.
Ian

I am a fan of an onboard AFR regardless of cams or 930-16/ 10 SC. I have found the CIS on both my initial 930-16 and the now 930 - 10 to be very robust and trouble free if looked after......but the AFR will tell you exactly what is going on with your system from idle to wot. It is a diagnostic tool as much as anything else and makes tune ups very easy.