I would (and did) start reading here....pay particular attention to jmark and tuner. https://www.tapatalk.com/groups/racingfuelsystems/index.php

pro systems is good at promotion and not much else.

You might want to put a power valve in the front and jet down to 84 or so

What took everyone so long?

One thing at a time.

Just install the PV with like 85 jets and drive it...... see how it goes.
Tweak from there.

Mine has a PV on the primary side BTW. It is far from a blubbery mess.

Guess I'm the odd man out in this conversation...different observations about a couple different carbs I've had here.

Looks like you're not alone Chip

The Dominator on my 572 Hemi is a Pro Systems 3 circuit as well. On the dyno with open headers, the AFRs from 4K and WOT up were perfect and the engine performed really well. I toyed with the idea of maybe going to a 2 circuit conversion but decided to have a go at dialling it in nicely in the car.

I have dual Widebands - one in each collector, this helped a lot as a tuning guide.

Once in the car the IABs and Int circuit needed a little tweaking along with equal reductions in jetting on both the Pri and Sec side - with a full exhaust now on the car, it really made a difference to the fuelling. The IFRs, HSABs and PVCR jet I left untouched so far.

It has a 5.5 PV in front as well, I now have it idling hot at around low 15s and cruises hi 14s/low 15s as well. There is little to no real load at idle or part throttle and despite what others have told me, I'm letting the car tell me what it likes using AFRs as a guide. The car loves the current setup, no surging, great transition and super nice plugs and clean oil. Hell, if I keep the right foot out of it it ain't half bad on the benzene consumption lol.

I'm now creeping up on the WOT and its nearly there but still a tad on the rich side need to get to the track to dial it in further. I'm guessing the PVCR jet will need to be a little smaller so I'll see what happens.

In my case I had to be super patient and persistent, make one change at a time, document each change, drive it and see what the car/engine was telling me. A bit of work - for sure, Worth it ? ABSOLUTELY !

I've found most guys don't have the patience (or time) to take the time to understand each circuit and its effects and then to dial it in properly with the right tools/parts.

Each engine is different ...gotta give it what it likes and use AFRs as a guide.

I was hanging out at the local speed shop yesterday while they were dynoing a fresh 540 shebby boat engine. The owner had them install Holley Dominator size multi port injection and they were trying to tune it.

Well, first they were just trying to get it to run well enough, long enough to start tuning. They were on their second day trying to get it lined out. They swapped a carb on to break it in and get some initial details.

They had tried about everything they knew to try, had called Holley several times and had switched back to the carb to make sure that the EFI was the problem.

I'ld hate to pay that bill. And did I mention that the boat had twin engines? So, they have this to do again. Anyone care to guess what the customer will have in his EFI when it's all said and done? $6,000? $8,000? Could it go $10,000?

I was hanging out at the local speed shop yesterday while they were dynoing a fresh 540 shebby boat engine. The owner had them install Holley Dominator size multi port injection and they were trying to tune it.

Well, first they were just trying to get it to run well enough, long enough to start tuning. They were on their second day trying to get it lined out. They swapped a carb on to break it in and get some initial details.

They had tried about everything they knew to try, had called Holley several times and had switched back to the carb to make sure that the EFI was the problem.

Glad that works for you and apparently you got a good tune going............ Do you have a wide band to verify afr's at different engine speeds.......... Just asking to get info and understand how you verify that your 3-circuit is great on the street and has no blubbery or over rich issues cos if so, that's a good thing for sure just haven't seen it first hand..........

Got the carb back from Dominic and back on the car. What a difference. The car runs great. Way cleaner and smoother. Going to take it out and drive it more only got to put a few miles on it. When it stops raining here I will log some more miles and report back . Very happy so far. Night and day difference very responsive. Thanks Dominic.

Thanks Brandon

Was wondering how it worked out as I haven't heard from you guys and I start twitching in anticipation............Very happy that you're happy.........