timing with fbo kit

[copsleeper]

Recently installed the fbo small block mopar kit for my 318.
the engine in question is an 83 318. It came from the factory with 4 barrel,360 heads and exhaust manifolds, 340 cam(434/440) and way too many heavy duty items to list.
I replaced the tq with an eddie 650cfm thunder avs, as it was bagged.
The exhaust is upgraded to 2" y and 2 1/2 all the way out with a flow pro muffler.
The car runs AWESOME!I saw a DEFINITE IMPROVEMENT all across the RPM range as far as power goes. But I just need to be certain with regards to the setting of the timing.
It's set at about 10 degrees with vacuum advance disconnected. Seems to be happy.

A funny thing also happened after the fbo kit was installed. The idle went from very smooth to lumpy! Reminds me of the way a 340 idles.
My best guess is, the carb was providing more fuel than the stock ignition could use. Now the fbo kit is burning it, and Im feeling the rich idle effect of the eddie and cam. Whatcha think?

So kudo's to FBO and Daves Mopar Shop in Calgary. His delivery speed would have done a Mopar proud. 3 days from order to my doorstep! AWESOME DAVE! I'll be dealing with you again for my Mopar needs.

Anyways, my question is; is there a special way to set up the timing when using the fbo system?

[360DARTGTS]

Try setting total timing at 34 degrees.. after all advance is in with the vac. advance disconnected.

[mbiker340]

did Don supply the distributor as well?

If so, he has curved it for your motor, and you will need to set your timing at 2500rpm, not idle.

My guess is that you will end up at about 18 degrees at idle with 34 total at 2500 pm.

If the FBO kit was burning the fuel, you would run leaner, not richer. Whats happeneing is that you are pulling less vacuum, and activating the power valve.

If all you did was swap in the ECU, then your idle should not be any different unless your old ECU was junk..(very possible). Check to make sure your other connections are tight, as well as for leaks under the carb.

BTW, Demon has a caution on their web site about not tightening the carb to the manifold too much, it will warp or crack, voiding the warrantee as well as ruinig your tuning efforts.

[dave571]

Thanks for the Kudo's... ;D

In any case, it is imperitive, that the timing be rechecked after installation of the ECU.

You will see a change in base timing, by changing this piece. I got EXACTLY the same result when changing my van to the fbo controler.


Check it by setting the max timing at 34 with the vacuum line disconnected. Then take a look at base to see what it is.

Let me know.

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