Ferocity02

I've had my Flyin Miata turbo kit w/ the Voodoo piggyback installed for about 2 weeks now. Today was the first time on the freeway. At about 3700RPM in 5th, if I mash the gas the boost is pretty much instant to 7-8 psi, but the Lambda hangs in the 0.96-1.00 range for about a second and then finally drops to around 0.70-0.75 which is what I normally see at this RPM and boost. Normally on the streets the Lambda response to boost is close to instant but for some reason not in this scenario.

Is this delay of any concern? Is it normal with this kit?

1995 Miata
AEM wideband

RunninOnEmpty

iTrader: (5)

yes, that’s a bit of a problem. The current Voodoo should support fueling under these cases:
- when you roll into positive pressure (lean tip in)
- mid-rpm when the car transitions from across closed to open loop



Is this a new kit or a “new to you” (used) kit?

it went through several variations, so what you read about these in the forums can be tricky whether it applies to you or not.

The oldest Voodoo was a little black box. It may or may not have a Voodoo Sticker on it. It didn’t have an O2 clamp. And if you don’t have it, you want one of those. (Search here for “older guy O2 clamp” as an example)

The newer versions look like a generic, bluish grey metal project box. No stickers. It has at least 2 versions I know of. Both have the O2 clamp built in. If you unscrew it, look for potentiometers inside, they can adjust fuel and onset in a very
minor way. I’d have to see if I have the old instructions squirreled away somewhere.

Some of the newer versions lack a potentiometer, IDK if that is standard now, or if it’s a CARB variant. If that’s the one you have, then you probably have the new one and can call FM for support.

If the fueling differs between a throttle stab vs slow “roll-on pedal”, it might be a hardware limitation that needed a better program. The solution most piggybacks are given is to send a bunch of fuel into these situations. Not ideal, but better than lean, and needs to accommodate every situation out there.

Most piggybacks are basically a private label from one manufacturer. Whether they take the generic tune or choose to tailor it to a Miata is something you won’t know. The only one I 100% know has custom tuned their piggybacks is FFS.

Ferocity02

I appreciate the detailed response! As far as I know it's the latest voodoo box and i believe one of the wires it taps into is the O2 sensor signal wire. The kit is new new purchased in March 2024.

The issue seems less severe or non-existent when gently rolling into the throttle vs stabbing the throttle.

I shot an email to FM and am awaiting a reponse.

I do eventually plan to go with a Megasquirt ECU but that's some time away.