So i just bought a kit with the intent of convering my Piggybacked Emanage blue to a Standalone Megasquirt, and i bought the Megasquirt2 Board premade for plug n play use with MX5.
After consulting the creator of the PNP unit i bought it from he provided me with a Closed AIT sensor saying that :
"Use the closed one - under high boost the opens one have had issues
The difference is delay is in the milliseconds - so works fine"

Trusting his judgment i went ahead and got one. I am having second thoughts now as all the information is saying that a Closed AITsensor is not fast enough for Turbo applications and i should be using a Open AIT sensor.
Whats the repercussions of using a closed one and is it worth changing it to an open AIT sensor.

 

The repercussions having a closed AIT is exactly what you've been reading. It's not fast enough. Your fueling and knock retard are dependent on the AIT reading and if it's not accurate then neither is your tune. The delay is likely much more than milliseconds, otherwise no one would use the open element. For measuring heat soak, a closed element is just fine, but you're measuring transient changes in AIT due to boost pressures changing.

All in all, I think it'd be worth swapping to an open element, but a closed element will work to get your running on Megasquirt.

 

Thank you very much for the reply. I will end up changing it to an open air intake system

 

Has anyone actually tested the difference in time between a Closed AIT and a open AIT sensor