Time to invest in the gauge to test system and control pressures at the WUR. Does sound as though overly rich on boost, which can happen with any serious intake leak as the normal starting point. CIS fueling under boost is an animal of its own and can work contrary to what a person may think.
You'll figure it out, one step at a time. Lots of experience here and people willing to share wisdom.

Thank you Mark,

Yeah it's fluffyness and popping on accel load which as you stated makes me think it's rich. I have most experience on carbs, but similar happens when it's overly rich in state. Now I have very little knowledge of CIS/Turbo'd cars so I'm very thankful for any help.
When I purchased the car it was running on 5 cylinders and didn't want to start, so within a few weeks renewed all gaskets and seals for the turbo side, rebuilt the WG, Turbo is recon/new. Recirc rebuilt and a full new ignition. Starts on the nose now and I've tweaked the idle to sit about 950rpm warm. Once I sort this WUR/Fuel issue its onto replacing hoses and corroded items. I'm very much not looking to working on the exchangers as the one has rusted away at the seam - that's a later on job once everything else is in good shape! I had the car for a great price 83 non sun roof in zin metallic so can't complain too loudly! thanks,
R

You should pick up some of those Rarly8 headers when you meet with him, best out there!

Very much on the cards when finances allow it! It's been an expensive month! haha.

How much of a diff does removing the exchangers make? are the cars drivable without?

Finally got around to looking at the car today.

So tested the WUR:

Cold pressure was at 3.2BAR should be 2.2 based on my spec manual
Warm was 3.75ish which is in spec..

But here's the kicker, full pressure Should be 6.75, mines at 4.. So I have a rebuild kit friends stripping it down and we're going to rebuild that. The Switch should be 18 - 21 ohms, mines running at 27 so that could also be cause for the issue.

So Fuelling it is, if when rebuilt and what not it's still down on testing injector tubes and fuel pump are my next go to's!

R

You're getting there little by little. Yes, system pressure is too low and is independant of the WUR. Unless something is amiss in your fuel distributor, you may be able to adjust that back to spec with some washers/spacers. What "switch" are you referring to?

Hi Mark,

For piece of mind the WUR is being rebuilt as everything I've looked as so far has been perished!
Sorry I meant the WUR plug/connector, producing 7ohms above spec.

So the pressure is independant then, I wasn't aware of that! Once it's rebuilt I'll recheck and then look to shim it!

When I first bought my car 10 yrs ago it had low idle and rich running problems. It had been to the local Porsche "expert" and still had problems which is why I got a deal on it.
After much trial and error on an unfamiliar system to me I found someone had removed the spring from the system pressure regulator and adjusted the idle mix all the way rich to compensate. Most on here wouldn't believe it would even run like that, but it did. The main confusing test was SP and WP were both about 4 bar. I had to make a spring for the System press reg, and was able to get it close. After buying an adjustable wur, cleaning the injectors and a new fuel pump everything fell into place. I got lots of help from this forum to get this straightened out. I doubt you have the same problem but since the symptom sounds familiar I was motivated to tell the story.

Good luck!

Appreciate it!

My car was sat for 32 years prior to me owning it, It's in really good shape less the paint needs a bit of work. It's just everything has perished because it's not been ran or used!

Getting there slowly, WUR is rebuilt. Will be looking to get see if I can get that back into spec with some adjustment.

If not injectors/fuel pump. It'll get there! I also have a bearing gone on my rear passenger wheel which from reading on here seems to be a common one! there's no fun in it if it's all easy right?!

R

Dude, you've checked, like, everything! It's totally possible a different cam could mess with the turbo, 'cause cams change how the engine breathes. If your dad's car got a different cam, it might not be letting the turbo do its thing right.

Just a small update: So having broken the WUR (don't ask) and bought a replacement off the chap on here we turned to fuel pressures. WUR isn't warming up. So look at the fuse block, relay for the second fuel pump isn't there and it's been hot wired off the brake light fuse. So... thinking, maybe the second pump wasn't running or at least not properly, the WUR may have never been heating and such the WUR wasn't the issue the fuel pump was.

Going to in the next few weeks try and go through the whole wiring loom and see if there's any other surprises. Super bummed to have broken the WUR for the car in which it may have never been at fault! waiting parts to be continued..