I have a 1050 holley hp 3 circuit dominator on my 526 wedge that is very rich trying to drive on the street. The engine was dynoed with the carb and was great at wide open throttle but on the street it paints the plugs black in 10 miles. It is a prosystems carb. They had me take the intermediate air bleeds out and it is still really rich. I have the timing locked at 35 degrees. It has 11:1 comp. hydraulic roller with 270 duration at .050 and Indy little ez 295 heads. Any help would be appreciated

Thanks Brandon.

You need to have it work on by someone competent unless you know the circuits and have the tools needed to modify it
That plugs would make me want to lean out the transition fuel feed circuit only by 30 to 40 percent
To do that you need a good set of numbered drill bits, #1 to #70, a good pin vise to hold the bits and a good set of taps and dies down to #4 size. I use brass #6x32 set screws to modify the carbs to lean those circuits down
If you don't have those tools or don't want to do the work yourself try contacting Dominic, Thumperdart, on here and have him do it for you

Have you contacted Patrick at Pro Systems about it? If not, that's where I'd start.

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.

Plug the intermediate circuit and see what that does. Don't go WOT like that, just fire it up and drive it a bit at part throttle. If that solves it then you know that you need to lean the intermediate way down. Back when I used a 3 circuit carb I had to take about 80% of the intermediate jetting out of the carb to get it to work.

You shouldn't use a 3 circuit on the street since at part throttle you'll have a lot of suction against the intermediate dump tube and it will pull extra fuel into the engine. You're best bet is to convert that carb over to a two circuit or else just lean the intermediate circuit down until it isn't killing the engine.

Do your metering blocks have jets for the intermediate circuit? If so you can easily change the jets. If you have an older carb without jets then you probably need to buy new metering blocks. Otherwise it will just be a pain to do all of the jetting work that you're going to need to do.

I've converted many to 2 circuits for street use, boat and even a drag week winner on here Ray Meyers...........Easy, not too expensive and VERY street-able when I'm done.........

Here is the spec sheet that came with the carb. The picture of the plug is with the intermediate air bleeds completely removed. Can I change anything to make it work or do I have to change it to a 2 circuit? Thanks for your help

Brandon

Replace the 0.040 intermediate fuel jets with 0.020 jets. That will knock 75% of the fuel out of the intermediate circuit. That should be a good starting point. Drive it a bit, see how it does and go from there. Do not go WOT until you have a good handle on what it is doing.

You might want to put a power valve in the front and jet down to 84 or so. That carb looks like it is set up for drag race only. Driving it on the street will kill your rings and eventually take the whole engine with it.

I’d def put a primary PV in it and take out some jet.

I’d try increasing the iab as well....... and see if there are any transfer slot restrictors in the main body.

Besides the carb, having the timing locked at 35 isn't doing the motor any favors on the street, I would think...

Only thing my Pro Systems 950HP (I know not a dominator, but still carb) was good at was WOT, pig rich at idle, it sucked, nothing would work.

Thumper fixed it and then some.

Thumper really is your best bet.

Make it even easier. Start with thse two at RFS for the how and why.
Tuning 1050 Dominator

Evolution and use of 2 circuit 1050 Dominators

Sounds like it needs to be Thumped

I don't run a Dominator but I agree about leaning out or taking out the intermediate circuit. I will say on my 850 DP I jetted it for mph at the track and found out it was a tad rich when at part throttle cruise. So I just dropped my primary main jest a tad and then opened up my primary power valve channels to make the fuel up at full throttle. I only dropped the primary main jets a little but it made a big difference when cruising at part throttle. Cleaned it up just right and plugs look much better. Ron

Well I gues it needs to be converted to a 2 cuircut. I sent it out to them so that I could use it on the street which is where it will be used 99% of the time. that didn't work. Do you know what kind of jets are used for the intermediate circuit? I could put the 20 jets in. Would it be ok to drive like 30 miles with the 20's? I wanted to take the car to a show this weekend and wouldn't have the carb back in time if I sent it out tomorrow. Also as far as the timing is it not good for the street to have it locked? I thought it would be better with my cam. I have 1.6 rockers Here is my cam card. Thanks Brandon

Your cam is very close to what i have in my 511, but flat tappet. Works great. I had 2 prosystems carbs in the past. Not impressed. Dom at Thumpercarbs will give you the most time on the phone getting that thing dialed. My 1150 was near perfect right out of the box. All carbs get tested on his 470 before shipping.

I'm just gonna say that Pro Systems did the 1200 cfm 3 circuit Dominator that's on my street/strip hemi and it's been great since 2006. No need to convert to 2 circuit if the 3 circuit is done correctly.
If I need another one done, Pro Systems will get my business.

If you want to drive it 30 miles immediately, stick a power valve in it and the drop the primary jets down. I can't say for sure what the motor will like but I'd think you want to down to 84 or 86 jets.
You have a 6.5pv laying around??

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

What took everyone so long?