4agze Map Based Fuel Cut

**RonRob** · 14-09-2010, 02:18 AM

I am curious to know what people are doing when they hit 15psi and fuel cut in their map based 4agze? Is there a simple fix to this or is there a need to get a fuel cut defenser? Would like to see how well the stock ecu holds up to about 20 psi with the twinscrew. I do have an aftermarket ecu, but I am having a few issues and would like to see what the stock ecu can do and if I will make it to redline with a new aftermarket knock sensor.

Thanks,
Ron

**Duk** · 14-09-2010, 10:31 AM

Originally Posted by RonRob

I am curious to know what people are doing when they hit 15psi and fuel cut in their map based 4agze? Is there a simple fix to this or is there a need to get a fuel cut defenser? Would like to see how well the stock ecu holds up to about 20 psi with the twinscrew. I do have an aftermarket ecu, but I am having a few issues and would like to see what the stock ecu can do and if I will make it to redline with a new aftermarket knock sensor.

Thanks,
Ron

The Emanage Ultimate software 'says' that the 4AGZE MAP sensor reads to 7psi. So at 5 volts output it has 7psi of pressure on it.

**Casey-G** · 14-09-2010, 11:05 AM

I'd be putting your efforts toward sorting the aftermarket management out, rather than even trying to run that much boost on the factory system.

I was always lead to believe the gze sensor was a 2atm sensor I.e 14.xxxxpsi could be wrong but.

**Duk** · 14-09-2010, 01:22 PM

Originally Posted by Casey-G

I was always lead to believe the gze sensor was a 2atm sensor I.e 14.xxxxpsi could be wrong but.

Again going by what the Emanage Ultimate lists, the 1-2JZGTE MAP sensors do read 14-ish psi.

JP · 14-09-2010, 01:59 PM

ignore the emanage ultimate. The GZE sensor is a 2bar sensor.

The OP can either use a traditional cheap fuel cut defender circuit or a bleed valve on the map line. I've seen both used with success on MAP GZE ECU's.

**RonRob** · 14-09-2010, 04:48 PM

Bleeder valve sounds simple and easy, but will I not be loosing boost pressure or do I bleed the air to another vacuum line that is holding the boost.
Please advise

Thanks,
Ron

JP · 14-09-2010, 05:02 PM

the setup I saw just bled excess boost off from the map sensor line, so the sensor basically never registered anything over 13/14psi. Was a turbosmart item from memory.

**RonRob** · 14-09-2010, 05:31 PM

Sounds easy enough, however it would seem as though you would need to bleed that boost to another line so that you do not have a boost leak and would therfore defeat the purpose of lets say boosting to 20 psi because its being bled to atmosphere.

Rom