MK1 vvt, MAF Vs IAT

Technical Area Engine, Transmission, Exhaust etc
1
  1. My model of MX-5 is: MK1 vvt (originally 1.8)
  2. I’m based near: Stratford upon Avon
  3. I’m looking for technical help or recommendations on: IAT install

Morning all

I have a vvt swapped MK1, can’t claim its my own work unfortunately. The car was tuned with the standard maf installed on a me442.

If I was to switch to an IAT would this upset the map? Only interested as want to switch intake system and ditch the bulky maf.

Apologies if this is a dumb question, not got much knowledge around the engine management/ tuning side.

Cheers
Tom

2

I would ask Bofi racing about it. I think the ecu needs to see iat and air pressure. The me442 has a built in MAP (mass air pressure) sensor. So you can run a vacuum line from a spare port on the intake plenum, through one of the grommets in the bulkhead and into the ecu. Contact us

3

Ye I’m pretty sure it’s set up through the map vacuum line, well I hope so anyway.

So I believe you can then just run on the iat as the map sensor replaces the maf function.

I’ll get in touch with bofi and see what they think

4

Or 5Speed. Steve was Phil Dixon’s mechanic at Performance5, did the first VVT swaps in the UK.

5

Feedback from bofi was that with the setup of a me442 on the map line is that the maf will only be using the air temp and not the mass air flow.

Therefore switching to a temp sensor that is properly calibrated shouldn’t cause any issues