14b and stock pump limits?

[beatshack]

Forgive me for beating this to death but, how does "your system outflow the MAF". Is it because the turbo inlet is creating a vacuum in the air intake effectively sucking in more air through the MAF the more it spools?

 

[oldman]

Forgive me for beating this to death but, how does "your system outflow the MAF". Is it because the turbo inlet is creating a vacuum in the air intake effectively sucking in more air through the MAF the more it spools?

It's simple, you're thinking only physics and forgeting the fact that there are sensors with limited capabilities involved as well. In other words, just because air is physically flowing through the maf, doesn't mean the sensors are capable of properly sensoring them.

 

[oldman]

When too much air is passed thru this chamber, the "vorticies" become unstable and the MAS cannot accurately count them. It is at this point the MAS is said to be overrun, and if datalogging airflow Hz, you will see it bob up and down.

Here you go.

 

[beatshack]

I understand all that, I just don't understand why they would build a sensor that could be outflowed with a stock intake and filter location.

 

[DSM90AWD]

I understand all that, I just don't understand why they would build a sensor that could be outflowed with a stock intake and filter location.

Mitsubishi designed their 1G MAS to measure airflow well beyond the capacity of the stock 14B Turbocharger. They were not building it to support 400WHP setups, however in '95 they did start using the larger "2G" MAS which can support 400WHP setups as it was designed for use with the 3KGT which stock had 300WHP.

As an FYI.. ~10years ago Al Blaha was running 10-sec quarter miles on a severely "hacked" 1G MAS. By hacking you allow more air to flow around the metering section but compensate via AFC/EPROM

 

[beatshack]

Interesting.. Thanks for that info. I'm quite sure I'll be moving to an MAFT and GM MAF after researching.