Tuning tips for running a Dominator on the street
#2795430
07/11/20 11:54 AM
07/11/20 11:54 AM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
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I have a 1150 Domm with 4 corner idle. Runs fine and no issues, but I know some of you guys have really been able to fine tune them for better street manners. Its on a 12.5-1 493, Indy-1's and indy single plane, 268@.050 solid roller, 5200 converter, 4.10 gears, 295/65 drag radial, guesstimate of 3400lb. Not exacty your average street car but I do ike to cruise on the street from time to time. Any pointers are appreciated!
2 kids and a dog
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795446
07/11/20 12:46 PM
07/11/20 12:46 PM
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Joined: Jan 2003
Posts: 8,037 Tulsa OK
Bad340fish
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I am sure this applies to a dominator as well but this was on a 4150. When I was happy how well my carb ran at wide open I measured all the areas that flowed fuel on the primary side and calculated the fuel flow area. Then knocked down the main jet size until the air fuel ratio cleaned up during street driving and highway cruise. When I was done I calculated the area of flow again, then added the difference back into the power valve channel. This made a carb that cruised clean, got good MPG, and ran the same wide open.
Now, I hated that process, it took awhile with lots of testing and trial and error. I have all these tiny drill bits and pin vices that are no fun to use. That process really made me look into fuel injection and once I switched I couldn't be happier and will never go back.
68 Barracuda Formula S 340
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795450
07/11/20 12:58 PM
07/11/20 12:58 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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Put an O2 gauge on the car so you can see how the adjustments really affect the tune.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Tuning tips for running a Dominator on the street
[Re: Bad340fish]
#2795462
07/11/20 01:35 PM
07/11/20 01:35 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
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I am sure this applies to a dominator as well but this was on a 4150. When I was happy how well my carb ran at wide open I measured all the areas that flowed fuel on the primary side and calculated the fuel flow area. Then knocked down the main jet size until the air fuel ratio cleaned up during street driving and highway cruise. When I was done I calculated the area of flow again, then added the difference back into the power valve channel. This made a carb that cruised clean, got good MPG, and ran the same wide open.
Now, I hated that process, it took awhile with lots of testing and trial and error. I have all these tiny drill bits and pin vices that are no fun to use. That process really made me look into fuel injection and once I switched I couldn't be happier and will never go back. this is the correct way to do it. think of the carb as having three distinct circuits; idle, cruise, power. trying to only use jets for power and cruise usually screws up both circuits. folks ignore the power valve channel restrictions but these passages are the power circuit; jets by themselves aren't.
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795475
07/11/20 01:56 PM
07/11/20 01:56 PM
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Joined: May 2004
Posts: 12,418 Taxes & Virus's R-US, NY
Dragula
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An AFR gauge and Thumpers cell phone number and a pile of small drill bits...
I tinkered a lot with my 1250, and got ok street manners out of it. But with such a big carb, I found I had to tune it for engine at full temp and hot days. which gave it bad manners on cooler days until the engine was at full temp. Mine was on a 605 Hemi and those are big hemi chambers. I find my little 512 wedge a lot less susceptible to AFR changes my 605 puts the carb thru. So in the end, it was kinda a compromise between the two. A little rich on hot days and a little lean on cool days...And lean as hell during start up. I have now put a 4500 Sniper Stealth on it, and manners have improved...Especially cold starts.
Last edited by Dragula; 07/11/20 02:05 PM.
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795508
07/11/20 03:32 PM
07/11/20 03:32 PM
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Joined: Jan 2003
Posts: 31,078 Oregon
AndyF
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I Win
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Oregon
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I have a 1150 Domm with 4 corner idle. Runs fine and no issues, but I know some of you guys have really been able to fine tune them for better street manners. Its on a 12.5-1 493, Indy-1's and indy single plane, 268@.050 solid roller, 5200 converter, 4.10 gears, 295/65 drag radial, guesstimate of 3400lb. Not exacty your average street car but I do ike to cruise on the street from time to time. Any pointers are appreciated! Street tuning is going to be difficult due to the cam not the carb. With a big cam like that you'll need a lot of advance at idle. It is difficult to achieve the timing curve you need with a mechanical distributor which is why I'd suggest going digital. If it was my car I'd do a Sniper + Hyperspark combo which will give you complete digital control of fuel and ignition. That setup comes with a wide band and a data logger so you can really dial in the tune. You can do it with a carb and a mechanical distributor but you'll need spend some money to make it work. You might be money ahead to switch to digital.
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Re: Tuning tips for running a Dominator on the street
[Re: lewtot184]
#2795528
07/11/20 04:12 PM
07/11/20 04:12 PM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
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I am sure this applies to a dominator as well but this was on a 4150. When I was happy how well my carb ran at wide open I measured all the areas that flowed fuel on the primary side and calculated the fuel flow area. Then knocked down the main jet size until the air fuel ratio cleaned up during street driving and highway cruise. When I was done I calculated the area of flow again, then added the difference back into the power valve channel. This made a carb that cruised clean, got good MPG, and ran the same wide open.
Now, I hated that process, it took awhile with lots of testing and trial and error. I have all these tiny drill bits and pin vices that are no fun to use. That process really made me look into fuel injection and once I switched I couldn't be happier and will never go back. this is the correct way to do it. think of the carb as having three distinct circuits; idle, cruise, power. trying to only use jets for power and cruise usually screws up both circuits. folks ignore the power valve channel restrictions but these passages are the power circuit; jets by themselves aren't. Thanks!
2 kids and a dog
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Re: Tuning tips for running a Dominator on the street
[Re: AndyF]
#2795532
07/11/20 04:24 PM
07/11/20 04:24 PM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
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I have a 1150 Domm with 4 corner idle. Runs fine and no issues, but I know some of you guys have really been able to fine tune them for better street manners. Its on a 12.5-1 493, Indy-1's and indy single plane, 268@.050 solid roller, 5200 converter, 4.10 gears, 295/65 drag radial, guesstimate of 3400lb. Not exacty your average street car but I do ike to cruise on the street from time to time. Any pointers are appreciated! Street tuning is going to be difficult due to the cam not the carb. With a big cam like that you'll need a lot of advance at idle. It is difficult to achieve the timing curve you need with a mechanical distributor which is why I'd suggest going digital. If it was my car I'd do a Sniper + Hyperspark combo which will give you complete digital control of fuel and ignition. That setup comes with a wide band and a data logger so you can really dial in the tune. You can do it with a carb and a mechanical distributor but you'll need spend some money to make it work. You might be money ahead to switch to digital. Certainly something to consider. My timing is locked out and use a digital 6 w start retard, so I have full advance at idle. Jetting is set where it made the most power on the dyno. Honestly, it runs pretty good and can idle all day, and has great response. Definitely not concerned about gas mileage! Id mostly just like less fumes
2 kids and a dog
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Re: Tuning tips for running a Dominator on the street
[Re: fast68plymouth]
#2795534
07/11/20 04:24 PM
07/11/20 04:24 PM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
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Put an O2 gauge on the car so you can see how the adjustments really affect the tune. I need one!
2 kids and a dog
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Re: Tuning tips for running a Dominator on the street
[Re: Cab_Burge]
#2795535
07/11/20 04:25 PM
07/11/20 04:25 PM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
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I would lean down the idle fuel feed and transition fuel feed circuits on the primary side to make it leaner at idle and ight part throttle cruise I've done that on several two circuits 1050 Dominators for street driving, if you don't know how to identify those circuits and have a pin vise and small # drill bit sets it might be challenging to get it done PM me if you want more information on this Dominic, Thumperdart, may be your best choice to do it for you, if he still does customizing customers carbs Thanks Cab!
2 kids and a dog
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795546
07/11/20 04:47 PM
07/11/20 04:47 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
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"Id mostly just like less fumes"
I have a convertible that used to have bad fumes issues, and it was efi'd. The large roller cam kept both valves open long enough so that it would burn your eyes and irritate most anyone that happened to be near the car at idle. It idles very close to 14.5 to 1 AFR too.
I run a warmed up 408 Magnum with a full TTI 3" exhaust with cross over, so I ordered up a pair of high flow, 3 inch inlet/outlet race only cats with a metal matrix and a 4 inch thick main body, welded them on just after my collectors and the car was clean of fumes from then on. They flowed so well, I never felt a power difference, even at full throttle. I was actually pretty surprised at how well they work and that the car didn't slow down.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795619
07/11/20 09:41 PM
07/11/20 09:41 PM
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Joined: Feb 2008
Posts: 715 Central TEXAS!!!!
sr4440
super stock
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Central TEXAS!!!!
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I have a 1150 Domm with 4 corner idle. Runs fine and no issues, but I know some of you guys have really been able to fine tune them for better street manners. Its on a 12.5-1 493, Indy-1's and indy single plane, 268@.050 solid roller, 5200 converter, 4.10 gears, 295/65 drag radial, guesstimate of 3400lb. Not exacty your average street car but I do ike to cruise on the street from time to time. Any pointers are appreciated! Street tuning is going to be difficult due to the cam not the carb. With a big cam like that you'll need a lot of advance at idle. It is difficult to achieve the timing curve you need with a mechanical distributor which is why I'd suggest going digital. If it was my car I'd do a Sniper + Hyperspark combo which will give you complete digital control of fuel and ignition. That setup comes with a wide band and a data logger so you can really dial in the tune. You can do it with a carb and a mechanical distributor but you'll need spend some money to make it work. You might be money ahead to switch to digital. Certainly something to consider. My timing is locked out and use a digital 6 w start retard, so I have full advance at idle. Jetting is set where it made the most power on the dyno. Honestly, it runs pretty good and can idle all day, and has great response. Definitely not concerned about gas mileage! Id mostly just like less fumes Why didn't you tune it while it was on the dyno? I done 2 dom for street driving and it does take a little time. I would get a O2 senor and just take your time. Joe
Last edited by sr4440; 07/11/20 09:47 PM.
Without Data, you’re just another guy with an opinion.
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Re: Tuning tips for running a Dominator on the street
[Re: sr4440]
#2795695
07/12/20 07:11 AM
07/12/20 07:11 AM
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Joined: Jan 2003
Posts: 8,037 Tulsa OK
Bad340fish
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Like said above the fume part may be hard to get rid of. My car will idle as lean as 17:1 out of gear if you want it to and it still stinks, even with 50* of timing. The intake manifold is a real mess at idle when you have a big cam with lots of overlap.
68 Barracuda Formula S 340
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Re: Tuning tips for running a Dominator on the street
[Re: TonyS451]
#2795715
07/12/20 08:25 AM
07/12/20 08:25 AM
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Joined: Jan 2003
Posts: 17,914 S.E. Michigan
ZIPPY
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Put an O2 gauge on the car so you can see how the adjustments really affect the tune. I need one! I'm getting ready for a change.....If you want to try one, you have a PM Still 4150 here, but I'll say transfer slot restrictors, followed by IFR were the two most dramatic "normal/gentle street driving" changes I've made. On the Dominator you have to figure out what you want to do with the 2 vs 3 circuit deal. I have never done one but 2 circuit sure seems easier for street....or at least, alot more like what I'm used to. Good luck.
Rich H.
Esse Quam Videri
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Re: Tuning tips for running a Dominator on the street
[Re: ZIPPY]
#2795790
07/12/20 12:29 PM
07/12/20 12:29 PM
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Joined: Aug 2003
Posts: 4,699 On the parachute mount
n20mstr
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If you want “no fumes” drive a regular daily driver lol
Sounds like you have a radical street car , fumes come with that lol , like rough idle and rubber on the qtr panels
Lmao
....BAD A$$ STREET CAR.....
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Re: Tuning tips for running a Dominator on the street
[Re: Cab_Burge]
#2796388
07/14/20 06:12 AM
07/14/20 06:12 AM
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Joined: Sep 2005
Posts: 625 Deep DEEP SOUTH
LAD 524
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^^^ THIS Spend the time to dial in the idle/transfer slot circuits then dial in your mains for 2500+ rpm cruise and your PV jets for WOT. That is the way to do it right, once done right, the difference will be night and day. Locked out timing really helps to dial it in right, as does an O2 sensor. I ran both 2 and 3 circuit Doms, the 2 circuit was much easier to dial in right. Even with a 280 @.050"roller and .750" lift.....idles in the high 14s, cruises at light throttle in the low-mid 14s, no surging, 12.5s at WOT. It can be done, EFI will need the same amount of dialling in to get right, sometimes more. Its just a different way of doing the same thing PS: No stink, plugs are awesome.
Last edited by LAD 524; 07/14/20 06:13 AM.
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