6872,+24.7,1865,100,100, 00, +25.6, 77.0,+16.2, +0.0, 75.00,1785, 10.42
6872,+24.9,1730,100, 90, 00, +23.6, 78.7,+16.3, -0.8, 75.00,1666, 10.96
6872,+25.3,1694,100, 90, 00, +23.6, 77.6,+16.3, -0.8, 75.00,1724, 11.05
6944,+24.9,1811,100,100, 00, +25.9, 79.7,+16.4, +0.0, 75.00,1824, 10.74
6944,+25.3,1760,100, 90, 00, +23.5, 81.1,+16.4, -0.4, 75.00,1677, 10.93
6973,+25.3,1742,100, 90, 00, +23.5, 78.9,+16.5, +0.0, 75.00,1748, 10.95
6973,+25.5,1908,100,100, 00, +26.8, 29.0,+16.3, +0.0, 75.00, 279, 10.64
7062,+25.5,1845,100,100, 00, +26.8, 81.3,+16.6, +0.0, 75.00,1923, 10.68

AS you can see I hit fuel cut during this run. It felt violent and very sudden. Notice the inj. duty cycle and Mod MAF when it hit. The air was very dense and it was raining. MY question is this. What is the purpose of fuel cut and is it safe to change the max MAF to above 2000MHZ? I am running the stock airbox but I do have cams.

 

Hehe.. I get that pretty frequently too in second gear... Yes, you can change it.. As long as the car is running rich (which it is) and your ignition timing certainly isn't too high...

I get the double whammy on occasion, I'll hit a fuel cut, or my boost cut is set around 23psi and I periodically hit that.. Same thing happens..

Some of the big turbo guys have to set their MAF Cut to 2500-3000hz...

 

Ok I am going to bump it up a little 2300MHZ, but I do plan on leaning it out some more. Do you think it will still be safe at 11.2:1? What is the purpose of fuel cut anyway?

 

i would assume boost and fuel cut are saftey measures so you don't blow up your engine. Say you have boost creep problems. 20 psi becomes 30 psi rapidly but the engine kicks in fuel cut or boost cut, engine is saved.

 

Boost cut is easy to understand but fuel cut still has me confused

 

I guess they can use fuel cut to tell you "hey, the engine is reving way to high".

 

Fuel cut is dependent on Airflow rate.. Since not everyone has a MAP sensor, its the only way to "Shut down" the car if its overboosting since Air mass is a measure of the air into the engine, if its higher than "Normal" for your car, then it can be deemed as overboost and would require cutting fuel to prevent damage... If you have a working MAP sensor, you can set the fuel cut value as high as it will go and rely on the boost cut instead... But its definitely a safety measure..

Another circumstance is if you have a bad boost leak, your MAF reading may actually go really high, but engine is only seeing a small amount of boost, so you'd cut fuel to prevent washing the pistons and cylinder walls down with gasoline..

 

how hard is the map sensor to get running ? it makes the car speed density correct?

 

no, the map sensor is only used to log boost and help the utec control boost (open or closed loop i can't remember). It also can be used to convert the loads into psi for better mapping. The map sensor cannot convert the utec into speed density.

 

Thea hardest part of it is rewiring eveything when your friend screws it up. Happened to me. I haven't played with the UTEC in a while, waiting for my lifters to come in, most of my lifters are shot and are wreaking havoc and the knock sensor is picking it up and screwing with my timing.

 

wow what happend to your lifters?