Hello again!
Wow, it's been 5 years since I posted any work on the car. And unfortunately, during this time I have not made opportunity to continue. But now, after years of wanting to, pondering, wishing I made time, what was 2020

...I have redeveloped the passion to recommence!
Because it's been 5 years, I've had to relearn everything I knew about 75's, by reading scores of forum topics (here, including readings this very topic (!), AlfaBB.com, elsewhere), rummaging through my old notes, creating a full inventory of all my parts, and refreshing the overall plan. Though, I've learnt many new things along the way, and through research, I've decided to take the car to another level.

The major difference to my initial dream - now 10 years ago when I bought the car! - is to go the full hog with the engine, and go with programmable fuel injection. I'm yet to finalise any details; and work on this particular development may be a year away after I complete many other things, but my plan includes:
- programmable system, likely Autronic, if I purchase from Beninca Motors and utilise their skills and advice to make it happen
- this means ditch the airflow meter, and go with MAP (manifold absolute pressure) / IAT (intake air temperature) / CTS (coolant temp sensor) / crank pulley timing wheel and VR (variable reluctor) sensor / potentiometer TPS (throttle position sensor); I've already made some inroads with some of the gear
- COPs (coil on plug) ignition, and ditch the distributor and high tension wires
- yet to decide whether I want any, or combination of, wide band Lambda/O2 sensor and AFR (air fuel ratio) meter, EGT (exhaust gas temp), fuel pressure sensor, knock sensors; I don't believe any of these will add to the day-to-day performance once the car is properly tuned, but I might add a batch of gauges in the interior
- cams: I've ordered a set of RJ (Richard Jemison, who is a regular on AlfaBB.com forums) cams from the US, and decided on a high performance 'street' cam that optimises both torque and power for the road
- very minor head clean-up / porting, which I presume Beninca can perform
- largely a complete engine rebuild, with 10:1 CR (compression ratio) pistons (as fitted to the Potenziata)
Of course, that means an engine-out job, but I'm also motivated by needing to replace the leaking rear main seal. So whilst I'm there...

For this return-post, I'm showing just
some of the parts that I've bought, much of it very recently:
Though, firstly, this is the Evolutione bodykit that I bought from JOHN G (you in Oz at the moment mate?!). From what I can tell and recall, it's the real deal, or at least it's a very high quality kit. I never did ask where he got it from originally. Compared with the flimsy stuff that I contemplated repairing and fitting (ie: the pieces that used to belong to jazig.k; I posted some pics of these on Oct 06 2013), this kit is very solid, and thus relatively heavy despite being fibreglass. Some minor repairs are required for the front bumper 'slats' where it's cracked, but nothing major.







BMC CDA (Carbon Dynamic Airbox) and aftermarket 75/SZ-specific parallel-flow aircon condenser. Not everyone approves of custom air intakes and filters, but some seem better than others; because this setup is fully enclosed, I can create some form of cold air intake.

Now onto some more serious stuff, the full RSR (Ron Simons Racing) adjustable suspension setup. From the decals, you can see it's built by Intrax; the Intrax catalogue lists its own large range of suspension setups for this car (including far more serious racing upgrades), but this is one of the sets designed/tuned to Ron Simons's specs. Of the two kits he created, this is the adjustable-shock absorber version (for combined compression + rebound); having fitted various suspension parts to my cars over the years, I've always found any non-adjustable setup to be a little lacking, so I am happy to stump up the extra for some fine tuning ability.
The kits are available directly through RSR (I'm speculating/observing here, but I think Ron Simons was bought-out by another company but they still utilise the name):
https://www.trackmodified.com/product/alfa-romeo/However, I bought from OKP in Germany, who sell the kit, and held an Easter sale:
https://www.okp.de/xtc2/After researching what suspension options were available, I determined that the RSR kit had very favourable feedback from users, provides a very complete setup, and is readily available. There's undoubtedly cheaper setups, and possibly 'better' setups (though that may be subjective), but this has always been my dream kit. So here it is.

Front coilover: this works
with the original torsion bars (ie: doesn't replace them), and provides the adjustable shock absorber, and adds another spring for increased spring rate. The thin red spring is a 'helper spring' to keep the main spring in position during full extension. The threaded adjustable platform can alter tension, but mostly caters for whatever ride height you choose (ie: after setting the ride height via the torsion bars, you can then dial-in the coil spring tension). The black, knurled knob near the bottom bracket twists, to make the compression/rebound adjustment.


Rear springs sit on adjustable platforms to alter ride height.


Rear springs and shocks fit in the standard location points. Shocks adjustable from the top.


Front antiroll bar seems a crazy 30mm diameter! Maybe it's rubber

except it's quite heavy, so I figure it's steel.

Rose/rod-end/heim joints affix the ends to the lower suspension arms. I will add rubber boots to cover the joints and keep them clean, and I have reinforcement plates that need welding to the chassis where the bar is bolted in place.

Rear antiroll bar is 26mm diameter, and adjustable via the different attachment holes. Rather fancy looking billet 'brackets' attach to the original De Dion mounts.

To round out the suspension, I have the Watt linkage parts (it's part of the package, but I bought it separately years ago when someone in the UK was selling it, unused), and De Dion spherical bearing.


Next: these parts are from Chris Snowdon Racing (operated by Richard Melvin, an experienced UK campaigner). Richard is great to deal with, and some of the racing parts on offer are quite serious but unfortunately go beyond what even I consider appropriate for a street car (yes, some of my parts might not have ADR certification, but I think an engineer might find they would meet the standard if required...maybe!).
https://alfettagtv6.co.uk/
For the front suspension, these are extended-pin upper ball joints, the sealed version (ie: feature the metal cap + rubber boot for protection). Some of you may use knuckle-risers, which achieve the same outcome, to raise the end of the upper suspension arm into a more favourable position (for better camber during cornering).


This is a reinforced clutch housing. I probably don't need it, but hey, why not?! If I achieve 250-260 hp (~190kW) from the engine I'll be happy, but that still probably wouldn't crack the original housing; not from driving on the street. But this is something fancy!


And a few extra bits and pieces. Here is a crankshaft pulley from a 164 featuring a '60-2' toothed timing wheel. Apparently this can be pressed-off, then the 75's pulley needs some minor machining (to make slightly smaller diameter), before being pressed onto it. It's seemingly impossible to find an original Potenziata pulley with the wheel, but one advantage of keeping my original pulley is that it's already balanced with the crankshaft and flywheel, so the toothed wheel shouldn't impact in that regard. 'Timing' is achieved with a VR (variable reluctor) sensor that is 'in the post', but I also have an original mounting bracket. And because the timing wheel creates a bigger overall diameter pulley, this fouls against a standard water pump pulley; hence, the need to change to a Potenziata setup, which means a water pump shown here, that uses a separate smaller diameter bolt-on pulley...that's 'in the post'

. I hope it fits!


Lastly, an LSD upgrade kit, from Racing Diffs. This will refurbish the factory diff, but with 4 friction plates instead of 2. Nice, complete kit from the looks.
https://www.racingdiffs.com/products/alfa-romeo-lsd-clutch-kit

It's nice to be back - posting - and of course getting my hands dirty again. I don't know whether I'll be posting every month like before, but I'll post when there's a worthwhile update on progress.
Thanks for looking...again.
