Tunnel ram or no tunnel ram...
OK vacuum leak was there for sure.
Now I can drive the car almost normal but lean spot is still there. If I slowly accelerate there is a point when it starts running rough because it’s very lean. The same thing happens when I try to cruise in 3rd gear, at low rpm. I get 15-16 afr. I tried smaller iab and it does nothing.
I had to remove power valves and small jets because it was extremely lean.
It’s now back to 78 square jets, I need to try 77 all round because its bit too rich.
Idle is better but I noticed that fuel level fluctuates. I set it right with car standing. I get great idle and then when I start moving, drive and go over some turns and fuel level is almost max which causes rich idle. What would cause that??
Overall I have the same impression as at the very beginning, which is a lot of power but not much consistency and unstable cruising.
Ok, I’m not sure you are understanding how the power valve works.
It should have been called an “economizer” valve because that’s actually what it does.
Depending on the size of the holes behind the power valve (power valve restricter channel), you can reduce the primary main jet size. And that’s what you want.
You set your cruise AFR with the primary main jets and then you leave them alone forever. You don’t touch them. Once you have the primary main jets sized correctly for cruise (a nice, clean, crisp, lean cruise if you have enough ignition) you can move on to other areas of the fuel curve.
For WOT tuning you now have to add fuel (or remove fuel) from the primary side with the power valve channel restricters. Not the primary main jets. And you control when you get the added fuel from the power valve circuit by changing the timing of when it opens relative to manifold vacuum. The higher the number the sooner you add the fuel through the power valve circuit.
This means you can get a very nice, clean cruise with the smaller primary main jets and still get your WOT AFR correct with the primary PVCR’s and the secondary main jets.
One other thing. I thin you said your T slot restricters measured .049 or close to that. That’s much smaller than anything I’ve ever needed. I’m usually in the mid .060’s to the mid .070’s. You may want to drill out the T slot restricters to .0625 (1/16 inch or 1.5 mm) and see what that does for your tip in lean spot.
You still have 3 emulsion holes open. You have a bit if tuning to do, but once you get it all cleaned up you’ll be surprised at how well a tunnel ram drives and how much more power they make.
