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Old 01-20-2013, 08:32 AM   #1
D_B
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DCOE Carbs to Custom TBs.

For the last few years my car has had this roller 405 with a pair of Mikuni side draft carbs.



The carbs were great but hard to get dialed in right because we over estimated how much to build them up to feed my engine. It was assumed that we were on target, but after more research and difficulty tuning I found that I was actually nearer to 880 CFM and that explained much of my trouble.

I had been wanting to find someone to convert these carbs to TBs, but that just wasn't feasible and I found someone who MAKES custom TBs. What I ended up with were a pair of DCOE style TBs, made and mounted to look and feel just like my side draft carbs. They house these polished 60# injectors and my TPS will be remote mounted at the pedal.






I am in the ordering stages of the Edelbrock Essex fuel pump, filter, and regulator...and I am leaning towards Megasquirt as the control system. It offers me self learning capability, I can retain my current vacuum advance distributor, and I won't need to worry with things like a cam sensor or crank trigger.

I'll know and post more about the rest of the project as I get things ordered.

I have to mount an O2 sensor in the collector, and I need to plan for the system box, harness, fuel system, and sensors for the system.

I'll be so excited the first time it fires under it's new EFI control.
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Old 01-20-2013, 08:45 AM   #2
Billy Johnso
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That set up is going to look sick on your motor. good luck with it.
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1977-stock

2005-A+A Supercharger-RPM trans-3000 stall Yank converter-Melrose headers-Xpipe-Borla touring mufflers-6psi of alcohol-tuned at Slowhawk Performance-573 RWHP 495 RWTQ-11.4 in the 1/4 at 122 mph spinning 1st and breaking loose in 2ndneed slicks!!!!!

http://www.youtube.com/watch?v=Ia9w-bVmQsQ my burn out at 2:53
Old 01-20-2013, 11:57 AM   #3
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Those are sweet looking Matt can't wait to see them in person. I'll ship you the bezels sometime soon and send my drawings of the killer light brackets to.
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As FPSRussia says "As always.... Have nice day"
Old 01-20-2013, 12:23 PM   #4
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One word- Megasquirt! -The guys (Matt) at DIYautotune is where you need to go. Best bang for the buck. Since you have basically a stock intake- vacuum will be no problem. Sorta running semi-ITB's -look at doing the MAP sensor along w/ the TPS. An IAT and coolant sensor (GM ones work great) and you are there.

A question- Are the injectors low (1-3ohms) or high resistance (12 or so)? That will make a difference on the ECU. Some can NOT control the low impedance ones-AKA peak & hold type (too much current draw). So check that out- or you'll be having to buy a resister pack or a drivers for the injectors.

GOOD LUCK!!!

Richard
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Old 01-20-2013, 07:12 PM   #5
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Originally Posted by Richard454 View Post
One word- Megasquirt! -The guys (Matt) at DIYautotune is where you need to go. Best bang for the buck. Since you have basically a stock intake- vacuum will be no problem. Sorta running semi-ITB's -look at doing the MAP sensor along w/ the TPS. An IAT and coolant sensor (GM ones work great) and you are there.

A question- Are the injectors low (1-3ohms) or high resistance (12 or so)? That will make a difference on the ECU. Some can NOT control the low impedance ones-AKA peak & hold type (too much current draw). So check that out- or you'll be having to buy a resister pack or a drivers for the injectors.

GOOD LUCK!!!

Richard

Richard, I was hoping you'd jump in. Thanks for some of your advice. I leaned away from the Jenvey TBs since they don't offer polished and after injectors their cost was much higher than what I paid to have these made.

The injectors were picked by the maker of the TBs, and he uses them for all his Megasquirt and F.A.S.T. projects.

I think Megasquirt is how I will go, for the reasons you mentioned. The MAP sensor is actually in the brain box so I just run a vac line to it from the manifold. The air temp and water temp sensors will be easy to place, same for the O2 sensor...and I have that remote TPS which I will mount inside and under the dash with the gas pedal.

I'm thinking Essex fuel system parts from Edelbrock...anyone have thoughts on those...or other suggestions? I want a quiet frame mounted pump, and an accurate regulator. From what I hear, Essex is a good brand, and will last a long time on a weekend driver.
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Old 01-20-2013, 07:51 PM   #6
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They do look GOOD polished...

I don't know about the essex...I hear a lot of talk about the walbro. Have you already modded your tank for the p/u sump?

How are you regulating the fuel pressure? Are you placing it on the fuel rails running to the return line to the tank...I know, I know -it just keeps adding up..

Just put an VOM across the injectors and you'll know real quick what you have.

I got the Jenveys because it saved me money not having to buy new injectors-fuel rails-regulator-just used the ones that came w/ the engine. And that would add up FAST when you have to get 12!!!


Richard
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Old 01-20-2013, 08:07 PM   #7
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Matt those are cool looking and will look good on your motor when installed. I still want to see your car in person sometime. I am retiring this June after 30 years in law enforcement, maybe I can come out for a couple of days and see you, andrew, and tj again. I think that would be a nice ride in the C5. Later

Dale
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Old 01-20-2013, 08:30 PM   #8
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Can't wait to see this come together! Beautiful setup.
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Old 01-20-2013, 09:19 PM   #9
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Originally Posted by X-FIRE View Post
Matt those are cool looking and will look good on your motor when installed. I still want to see your car in person sometime. I am retiring this June after 30 years in law enforcement, maybe I can come out for a couple of days and see you, andrew, and tj again. I think that would be a nice ride in the C5. Later

Dale

Dale, absolutely I would love for you to come visit and stay a weekend. If we plan it ahead of time enough we'll get all the local guys involved and spend some time together. Put that in your books for sure. Maybe by then I'll have my C7. LOL.
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