Thread: Is my MAP sensor bad?

It has bc stage 3 cams at +5 / -5. I might just have to go tps alpha


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I verified it has 4.7 volts output from the MAP sensor with key on/engine off.

Sounds right to me. I'm like 30feet from the ocean lol... so sea level

I don't really want to run a vacuum block or canister............ Sounds like MAF or TPS Alpha tuning for me only

If I use TPS alpha should I use an air temp sensor still (in intake pipe) and or keep the MAP for BARO. enrichment/correction?

Nothing wrong with a good ol maf sensor.. I hate the space they take up but they work just fine for me

Honestly, I am not sure exactly why you think how it is reading is a problem.

That is pretty typical for a larger camshaft engine to draw less vacuum at idle and then pull more as the engine RPM rise (engine becomes more efficient).

You shouldn't have any problem at all tuning the car via speed density on this setup. No reason to go MAF or AlphaN (unless you are ITB).

How can I tune it on map if I'm idling have way up the load and then the load goes down as I rev. I can't re scale the load axis to suit can I ?

This is non turbo

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So the load scale should start at my current idle/mbar? So start it at 500/600mbar and go to 1000mbar (wot). This way it won't drop. Im not going to have much resolution

It's making sense now. I had made the load scale go from 0 mbar to 1000 mbar.

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Yup, although I would have it start from 300/400 just in case.

No reason to start it where you idle .. you should be OK starting the load scale at around 200-300 mbar and you can go up to 1000mbar or so for WOT.

The default B13 speed density file should be a good starting point for you.

Thanks

I'm getting somewhere now Had it out for a drive today.

I set it to 400mbar because its between 350-450 depending on my idle speed.

Starts good cold/hot and idles good.

Now back to tuning this beast on speed density, which is going to be a bit tricky with this 90mm TB ........................