Carbed 88 computer

[denguy]

What does the computer do in a carbed 88? Also what happens with the computer when you swap in a Weber type Carb? Thanks.........

[TominMO]

What does the computer do in a carbed 88? Also what happens with the computer when you swap in a Weber type Carb? Thanks.........

When you swap in a Weber, the computer is not in the loop any more. The only thing connected to the Weber are two vacuum lines to the disty, a 12V line for the electric choke, and the PCV hose from the valve cover, IIRC.

[bravekozak]

The computer controls the feedback carb.
It takes all of the inputs from the A/C, water temp, oxygen sensor, yada, yada and then tells the carb to speed up or slow down, etc.

Just get rid of it.

[denguy]

Thanks for the comebacks........you said "get rid of it." Do you mean the computer and/or the carb? So the computer controls nothing else on the car but the flow of gas through the carb. Just a general question, Will the stock carb work without the computer?

[bravekozak]

No the stock carb will not work without the computer, but a Weber carb will.
The computer also controls signals to the various solenoids and receives signals from such things such as barometric sensors, etc.

[zoe60]

I just left mine in. I don't want my check engine light to come on. It's not hurting anything and I guess it still thinks it is controlling the carb that's not hooked up to it. One good thing about the Weber, I used to run about 16 inches of vacuum and it went all over the place. Now it is rock solid at 19. Idles smooth as glass too.

[brickdog2000]

One good thing about the Weber, I used to run about 16 inches of vacuum and it went all over the place. Now it is rock solid at 19. Idles smooth as glass too.

So you increased the amount of vaccum lines????? I only have the two for the disty. Along with the one for the master cylinder and maybe two or three more just pluging the ports ont the intake manifold.

[TominMO]

So you increased the amount of vaccum lines????? I only have the two for the disty. Along with the one for the master cylinder and maybe two or three more just pluging the ports ont the intake manifold.

I don't think he's talking about the number of lines, but rather the vacuum's strength.

[bravekozak]

manifold vacuum

http://www.worldlingo.com/ma/enwiki/en/Manifold_vacuum

The higher the vacuum to begin with, the more you will have whenever you put the hammer down.

[FestYboy]

The higher the vacuum to begin with, the more you will have whenever you put the hammer down.

^ not true, i idle at 23"hg and putting the "hammer down" nets me 1-2"hg with a factory carb on a B6. if what you say is true, then zoe60 should be reading positive manifold pressure at WOT (which we all know ain't happenin'). vaccume has to do with throtle position and cam/piston timing as well as port flow and restrictions like dirty filters.

also, what about camed out V8s and the like that idle at 12"hg and produce gobbs of power.

(i'm not disputing the link/article, just the statement)

[bravekozak]

correct

You are right.
I should have qualified that it was for a normal engine with a smooth idle.
Of course, as you move up in performance, the wilder the camshaft, the lower the Hg at idle, to the point where you can't even use power brakes.