So who wants their ECU's "Chromed"?

**Greg E** · 05-31-2012, 09:35 AM

Originally Posted by 99 vr4

Your missing the point. there is a table 4 the map sensor scaling, even though it is only 4.egr.

No there isn't. Only an EGR duty cycle correction table that uses MAP voltage as the axis. This is one of about 6 things that need to be changed to make the map sensor work with the EGR and purge code.

In the later EVOs there is a voltage scaling table. The H8 ECU EVOs and DSMs didn't have one either.

The scalings you're posting are what I need to calculate the voltage references though!

**Greg E** · 05-31-2012, 09:41 AM

Originally Posted by 99 vr4

I see so the translator converts the actual mass air flow back to a representive air flow in Hz based upon a set temperature and baro pressure to trick the ecu

Not exactly in the sense you're trying to make it out to be...

The HZ value is the base value and the baro/AIT are just corrections. Think of it like this: the GM/Ford sensor report the ECU the corrected HZ value for Baro/AIT so the ECU doesn't need to correct for it again. This is why those values are fixed.

**Toni** · 05-31-2012, 10:55 AM

So I was planning to use my gm sensor in blow through and just have my maft gen II translate and submit fixed values to the ecu. The HZ value will be corrected but will having the baro/AIT fixed cause any other issues for other ecu operations?

**Greg E** · 05-31-2012, 11:10 AM

Originally Posted by Toni

So I was planning to use my gm sensor in blow through and just have my maft gen II translate and submit fixed values to the ecu. The HZ value will be corrected but will having the baro/AIT fixed cause any other issues for other ecu operations?

I tried the MAFT in draw thru on my car and it worked fine. Not as crisp and smooth as stock, but still good enough. I had to richen one click on either the base or the low to get it right. I don't exactly remember anymore. With some tweaking to the MAF tables, I was able to zero that back out.

**Toni** · 05-31-2012, 11:14 AM

I am ok with that. I would imagine it's way more predicable then having it piggy back on the stock ecu. I guess I was more inquiring about other functions in the ecu that use the baro/AIT, like maybe boost control or something else I don't know about.

**Greg E** · 05-31-2012, 11:40 AM

Originally Posted by Toni

I am ok with that. I would imagine it's way more predicable then having it piggy back on the stock ecu. I guess I was more inquiring about other functions in the ecu that use the baro/AIT, like maybe boost control or something else I don't know about.

Everything (almost) in the ECU is airflow based. If the MAFT calcs are off, it'll throw everything else off down the line. I just don't have much of any road time in with the MAFT other than to tell you the car starts, runs and drives "decently".

**Goallie11** · 05-31-2012, 02:28 PM

Does anyone have another link for injector latencies? This one is down: http://injector-rehab.com/shop/lag.html

Found a cached copy, here's the injector latency/lag time for most injectors

Fuel Injector Lag Time