911sc engine upgrade - top 3 things to do?
 

My 1982sc is due for the engine and gearbox to be overhauled.

Gearbox replacing syncros and general tidy up.

At the same time I am going to overhaul the engine (not me a company will do it).

I have a budget-

So realistically what engine mods will release more power?
Or add more power.

Am I better to concentrate on the heads?
Compression?
Pistons?

Top 3 changes that would improve the engine but not ruin the day to day drivability.

It is a street car.

Thanks

Hello,

Check out the current thread started by vereeken, it's a good place to start. Good luck!

PW... I'd start with 1.) Compression. Consider new pistons & cylinders, new valves (or valve grind), new guides, new seats. Depending on your engine's current status, that alone can make a noticeable difference in performance. Combine that with new syncros & coupler... minimal dollars for a performance boost compared to where your engine is now. And I'm talking stock stuff. Competition stuff can get expensive.

2.) Know some guys like a special cams and Wong chip for actual added performance. I think that is a slip in so no head mods---don't quote me on that. Someone will surly chime in on this.

3. ) Exhaust system. Again, there are guys that know much more than I so better to let the qualified advise.

Wong chip in a 82sc????

Now this is a surly reply;)

If your emission exempt backdate exhaust to 74 ssi's or headers if you don't need heat ( especially if you go with any head work or bump the cam).

Location? Are emissions an issue?

Low hanging fruit for an engine. Early Heat Exchangers, good muffler, cams.

Choose cams that match your driving profile. This means low speed torque or high rpm zing can be manipulated via cam choice.

If you are going into the transmission then consider a different gear stack and/or 7:31 ring and pinion. This will lower the effective gear ratios and improve acceleration.

Lastly, smaller diameter tires will also help with acceleration at the expense of ground clearance.

Parr Motorsport just dyno'd a customer's race car with a Stock Euro SC engine. Measured 204BHP as per spec on dyno. AFR was bang on.

Fitted our CDI+ ignition box, AFR showed lean (burning more fuel). Corrected AFR by small CIS mixture adjustment...

216 BHP. Ignition not even mapped yet.

Bosch CDI replacement and classic car fuse panels

Thanks I'm now reading through the thread

👍

Wow! Just wow.

That is a boatload of ponies for, I am assuming, a "weekend" change-out.

Bruce Anderson says in his 911 Performance Handbook the gear stack change feels like 50hp. But then you can't go 140mh.

Johnny's ignition would still add that 10+ hp in the 80-110mph range.

I went 140 in my 81 twice. First time was bragging big time at the coffee bar. Second time had my GPS. I was going 124. Speedo error. The SC takes a while to get to that real speed.

If I buy this how do I know how to adjust the fuel? Sounds intriguing, will it really create that much power? Why do new circuits make it better? Can I mod the curve? The website doesn't show or explain that.

Also why change the fuse box if I'm not having issues?

Remember he started with a Euro 930-10 SC that is stock at 204 HP.....you have a stock 180 in US spec.

On a CIS car, you adjust the mixture with a 3mm Allen key through a small hole to the left of the fuel distributor.

There is a detailed 30 page manual in the downloads section on our website which details the benefits, why our unit makes more power and how to mod the curve. There is also a full dyno report also. Here's the link:

911 CDI+ (3 Pin) - Classic Retrofit

The product has been independently tested and backed by some of the most respected engine builders in the UK and also by Loren Beggs of 911Design in the US. See our 'Agents' page, here:

Agents - Classic Retrofit

Regarding the fuse box, these are a weak point on the 911. If you've ever thought that the windows / sunroof were a bit slow or the lights simply weren't as good as a modern car then fitting one of our panels will be a revelation. Everything works better, sharper.