Thread: Did aftermarket TBI just get put on notice?

Tweet

Yeah, I watched the video. I still don't see how his package can optimize air/fuel ratio and performance without touching the fuel supply, i.e. the jets and metering rods. Now perhaps his "setup" that he says is on another video includes optimizing the jets, metering rods, accelerator pump and idle mixture to presets before hooking up his "controller".

I did a search on Carb Cheater Reviews and copied this, which gives a pretty good explanation of what he's doing:

I don't think it does anything to the carb itself. It just messes with the AFR and using the wideband, it modulates a vacuum/purge valve to open and add air when AFR is too rich, and closes when it's too lean. MOST conventional (non-CCC) carbs are set on the rich side, so a calibrated and controlled vacuum leak will "correct" the AFR, or at least send it in the right direction, and helps band-aid the issue. Obviously continous readout and variability makes it respond. The shorter the vacuum lines, the better the feedback. If you have a stubborn carb you can't get tuned right, this may help. But for $383 for the rather simplistic kit...I don't know if it's not worth learning how to tune your carb yourself. For that kind of money you could just about get a good rebuild on your current carb. Just my opinion.

The ECM on CCC cars does just the opposite. It meters the fuel through the mixture control solenoid to try and strive for that 14:7 magical AFR among other things.

So in my mind he's using the carb as the "injector" but has zero control over the pulse rate to modify the volume of fuel, and he's assuming that your carb (or setting up the carb?) to be slightly rich so he can then tweak the air side to add more air through his spacer, basically a controlled vacuum leak.

I'd rather let my engine pull the air it needs, and adjust the fuel based on that air flow. I have to agree with the comment above, either learn to tune or spend your money on getting your carb rebuilt by Riley's Rebuilds!!