I have an S5 NA and plan to go MS as soon as the plug-and-play batch is available.

My question is, what sensors will the plug-and-play megasquirt be expecting and what additional work will I have to do if I want to remove my airpump, ACV, cat, rats nest, etc and still have the aux. ports and VDI work?

I understand the AFM becomes unnecessary because of the MAP sensor.
Is the stock TPS also unused with the PnP setup?

 

You can use the stock TPS. The PnP unit will be expecting the stock sensors.

As far as the MS goes, you don't have to do anything extra to the MS to make Aux and VDI work without the airpump etc...

I'm sure tofuball can tell you mechanically what you have to do to get rid of all that emissions stuff as he did it in his car.

 

Well, I answered your IM when you IMed me, but I'll answer it on the forum cuz I'm sure other people will want to know

The PnP MegaSquirt uses the stock air tempreture sensor on the manifold. It also uses the stock coolant sensor. It uses the stock TPS, even if it is way out of whack, you can adjust the MegaSquirt to adapt, or you can use another brand (Ford/Chevy) of TPS entirely. Or, you can use MAPdot accel enrichments instead. The MegaSquirt uses its own internal MAP sensor. Lastly, and most importantly, the MegaSquirt uses the stock CAS.

The MegaSquirt CAN control your stock BAC if configured to do so.

If you remove your AFM, jumper the fuel pump connecter on the harness. You can remove everything else without trouble.

It also CAN control AUX/VDI/E-Fan/Whatever but for it to control AUX/VDI on an S5 you will need to use the airpump method described in the second gen section

 

I'd recommend adding another relay to jumper the fuel pump connector via MS control, or re-wire the fuel pump control circuit. Putting a permanent jumper in place is not a great choice from a safety standpoint.

 

I think he meant to run a wire from the MS to the test connector. That will allow the fuel pump to come on if you run the wire to the correct side of the test connector.

 

I've been wondering this for a while, and this seems like a good place to ask, as it's relevant to the topic at hand. What emissions controls, engine controls and so on can and can't the Megasquirt run. I know it can't control the OMP as of yet, and you say that it will control the BAC, but what about other emissions controls for instance (there are other ECU controlled ones are there not?). I'm thinking about getting one of the plug and play S5 units when they become available, but I won't be taking all the emissions and so on off the car permanently. I may need to move back to an area with emissions testing, so I'd need to be able to return the car back to running on the stock computer with all the emissions controls intact (I don't want to risk failing with a standalone). Also, do all the stock guages still function normally? How about idiot lights?

Also, does anyone know much about the OMP. I read a thread in the 3rd gen section that said that the OMP goes to a 50% injection mode when unpluged. Is that true of the S5 pump also? Ideally I'd want to be able to control the OMP so I wouldn't have to pre-mix, but it's a small price to pay.

For daten: It's really best to leave the airpump, ACV, rats nest, solenoids and so on in tact, as any other system of activation will take a whole bunch of work to do, and it won't be nearly as reliable. I did a bunch of looking around earlier, and I conluded that I should just leave well enough alone. You can take the cats off with no ill effects though (other than the ill effect on the environment, but I'm not one to preach).

 

The idiot lights stilll all function.

The PnP MegaSquirt does not REQUIRE you to remove anything, it just allows you to. You can always take the PnP unit out and just put your stock ECU back in, and bam, everything is back to the way it was.

The stock gauges all function normally.

If you are S5, you might want to do what I did on my convertable, and dissasemble the OMP, remove the solinoid/sensor, set it to a few turns open, (I used two washers) remove and plug the lines that go to the manifold and just leave the two that go to the rotor housings, and premix at 100:1.

 

Thanks for that.