Little bit of information:

1986 GXL with 195000 on the chassis
S4 NA rotors & housings on TII irons & front cover
NA flywheel, NA tranny
550 prim/850 secondary
S4 Turbo
NA ECU (going MSII after car is idling on its own ECU)

The motor was rebuilt 2.5 years ago in a kitchen of our previous rental. Before moving into our new home, it was dropped into the car with a freshly painted engine bay. She's been sitting in one spot after 2 tows to get her into my new shop.

So, after a slight timing nightmare, the car now fires up and sounds super. I have no doubt she'll idle on her own once everything is hooked up. She still needs the intake buttoned up (open vac line supplies, everywhere), turbo+exhaust bolted on, and coolant system bolted in/filled.


Wastegate Question:

So the first question... the wastegate for the turbo. Keeping in mind that these are S4 NA rotors, does the general consensus believe that this port is large enough to keep the creep down? I completed this port over 2.5 hours of grinding this evening.


MSII Question:

I purchased a MSII with the Zeal PnP adapter for S4 harness. Now this setup was previously run on another member's TII. My question is this: Do I need to modify the NA harness to run with the PnP adapter? I can only assume that the TII harness may have had additional sensors at certain pins that the NA did not. Could anyone quickly identify these and how I would remedy the situation?

 

As far as the wastegate.....I just ported mine a few months ago, I welded a washer on the flapper, ported the hole to about 28mm and back cut it. I still overboost. My car has a 3" turbo back and no TID. Im going to have to choke the intake side to keep the boost down for now.

So from what I see in your pic, it doesnt seem big enough to me.

 

I attempted to use my Crafstman Mig Welder to put the washer on mine (a 3/8" washer from Tract Supply). It didn't work out so well.

I'm going to take it to the auto shop across the street and have them weld the washer on for me.

28mm was too small? This one should be about 25 or so. Are you also using NA rotors or just turbo rotors with the big exhaust?

 

you are going to find that with thigh compression rotors, your turbo is going to lose its "huff and puff" in the upper rpm band.

 

turbo rotors/streetport/big exhaust and intake.

 

A better explanation?

My turbo won't spin as fast? (doubt it...) It'll be too hot? (probably?) ???

 

your exhaust will be a bottleneck. the stock turbo manifold and turbine housing are going to choke it in the upper rpm range.

 

Even though I only plan to run the stock 6psi (plus creep), you think the turbo will be shittin in the upper RPMs?

You marked the high comp rotors as the culprit earlier... but I would think that the same problem would exist regardless of rotor type, based on setup?

Thanks for your input, btw. Just taking all things into consideration.