turning fuel cut off

[uglytalon92]

i have a maft and one of the mode switches is a fuel cut shut off. would it be a terible idea to turn that off so that i dont cut???

 

[steve]

The MAFT can't turn fuel cut off. All it can do is limit the amount of air reported to the ECU so you don't hit fuel cut. The down side is while it's lying to the ECU your running lean and greatly increase the chances of going boom. I'll take fuel cut over boom any day.

 

[Achelea]

You don't want to disable fuel cut, it's there to save your motor.

If the ECU thinks it sending too much fuel it cuts it off. It's so you don't get a runaway engine, or throw a valve, or burn a piston, or throw a rod Our motors aren't made for 11k rpms. (Oversimplified, but the concept is there)

 

[steve]

If the ECU thinks it sending too much fuel it cuts it off.

Close, it actually is checking the airflow and if it exceeds what was programmed as normal, it cuts off fuel. Mainly to protect against the boost solenoid hoses coming off.

Since the ECU injects fuel based on the airflow, you don't want to limit what it sees if the air flow continues to increase, you just get leaner and leaner until bad things happen.

 

[uglytalon92]

i gotcha.. but if im fuel cutting way too early like 10 11 psi... it gets realy old i wish i could just turn it off ya know?

 

[steve]

Then you have a boost leak

 

[uglytalon92]

if i dont know how to properly blt.. can a performance shop do a blt??

 

[RoryBarron]

Visual Frequently Answered Questions - Home Page
No point in paying someone else to do this, it's very easy!

 

[Achelea]

Close, it actually is checking the airflow and if it exceeds what was programmed as normal, it cuts off fuel. Mainly to protect against the boost solenoid hoses coming off.

Since the ECU injects fuel based on the airflow, you don't want to limit what it sees if the air flow continues to increase, you just get leaner and leaner until bad things happen.

Oh, cool! thanks for the update.

Also, as for the Boost Leak Tester, if you can't make one, there are tuners near you.


Also any Wisemen chime in please, (This might not be as helpful, take this with only a grain of salt.) I have heard you can spray carb cleaner where boost leaks likely occur. If the RPMs change one way or another when you spray, you've found a boost leak. ((NOT dousing the entire engine bay))

Might wanna find the boost leak soon. I've eaten two turbos with mine.

 

[WizardTSi]

Oh, cool! thanks for the update.

Also, as for the Boost Leak Tester, if you can't make one, there are tuners near you.


Also any Wisemen chime in please, (This might not be as helpful, take this with only a grain of salt.) I have heard you can spray carb cleaner where boost leaks likely occur. If the RPMs change one way or another when you spray, you've found a boost leak. ((NOT dousing the entire engine bay))

Might wanna find the boost leak soon. I've eaten two turbos with mine.

I'm not a wise man but I have used the method of carb cleaner to find leaks in the system. Works great, when you find a leak the RPMS increase. I've used it on vacuum lines and fuel injectors (to test the o-rings)

 

[gusu]

Soapy water also works. If big ass bubbles start forming you got a boost leak there.

 

[steve]

Carb cleaner or propane while the car is running will help find vacuum leaks but you still need to pressurize the intake and verify that the system holds pressure for a min or two without adding additional air. There are interesting ways that air can leak that just vacuum testing will never find.

 

[uglytalon92]

would a crack in my tubular manifold be my coost leak?

i also smell raw fuel if im really getting in it after awhile... could my orings be leaking as well??