As the carbs are almost ready for the powder coater, I start modifying the AFM to be used a little bit differently then stock. Simple set up useing a Stock 83 5 speed ECU for a EFI controller(go figure) on a ITB set up. yeh yeh yeh, throw the doughts out there. A AFM is what, a flap door connected to a Point-O-Meter right? so why can that pom be connected strait to a throttle linkage? yeh the amount of air goin in might not be exactly the right amount vers thottle position, but either geared, or re calibrated I think it will work. A simple flip of a switch can kill fuel flow to the DCOE's, and instantly turning them into ITB's. Plus, I already got the ECU. As for injector placement, Stand off's are my choice. spraying right down the throat of the webers. Once working, I'll invest into a Z31 with the MAF, and place the MAF sensor in the air horn of one DCOE's. true it will only be reading off one cylinder, and will give false readings, but the spray of fuel will cool it as 6 cylinders will. getting it close to what it needs to be, maybe an addition of a resistor in circuit. Resion? just to do it. Opinion means allot, a simple no it won't work, or why it won't is cool. Or any idea's that go in this direction can really help. But I can see this working with time spent. Big bonus is, the Webers will let me test, and still drive the car to work and back. The goal is not max power, but more of MPG, the Webers give the performance. but some MPG without changing jets can be a bonus.

 

I read through that... and I'm not sure what you are doing. I know your wheels are turning in y0 head, but have you read the Bosch Fuel Injection book? It explains in great detail how each system and component works. There are many reasons why the injection systems are set up the way they are, but mainly for simplicity and efficiency.

Excellent reads (I have actually read the main Bosch fuel injection book several times. )

http://www.amazon.com/Modify-Bosch-I...5597312&sr=1-1

http://www.amazon.com/Bosch-Fuel-Inj...5597312&sr=1-2

 

Im confused...

You're running carbs with fuel injectors fit into the throats?

And you use the carbs for now in case your FI ITB system isn't working correctly and you can't get good start up, or afr's??

Or?.....

 

From what I can tell. Hes using the carbs and at a flick of a switch the carbs fuel system shuts off and the FI system kicks in to pick up the slack.

I thinks thats kinda cool but at the same kinda kinda...useless... Not sure what to think of that highbred Carb/EFI system. using the AFM as a TPS will work but not very well. it will dump fuel if you floor it a low RPM and kill the motor due to flooding, then at high RPMs with the throttle partly closed (cruise) You will be getting to little fuel and lose power.

You could make an air box and have the air flowing though a large AFM like a turbo one then the maf swap later would be easier.

 

The carb's will the the main and primary fuel system. Yeh it's useless but i got the stuff, cost nothin but some injector mounts, and somthin to play with. I think i may start with the Z31 due to the MAF over the older AFM.

 

And I wouldnt use a HOT wire maf just outside the throat of a carb. Just a bad thing to do IMO lol

 

it will be more inside then out. close to the choke on the DCOE

 

but with the MAF, it's used to all six cylinders drawing air through it, now there's just going to be one cylinder pulling vacuum on the MAF...

I know what you're thinking with the AFM idea though, I thought about it myself, personally lol

I think a Megasquirt ECU would be moar bettar than the carbs AND the stock/Z31 EFI any day of the week (assuming it's tuned right)

 

True. Webers have been somthing i've always wanted. To me they fit the era of the car, look and sound great. With the MAF on one cylinder, it's true its supposed to be on all 6. but the spray from the stand off injectors will cool it down. This is more of a tinkering project, no where on the MS level.

 

I'll give you props, for your creativity. And I will stand on Weber carbs. Had them on my '82 Datsun King Cab pickup. And also my '86 Nissan pre-hard body 4 + 4. Really good dependable carbs. Good luck with the project.

 

fubar always has a plan, and a back-up plan. nothing is worse than dd a car, but trying to upgraded or modify it in a weekend. besides its crazy custom, thats what fubar is all about