bleeding from map sensor to increase fc

[RGM1800]

came across reading this article. can anyone tell me if its safe to use it?

target boost 1 bar
fueling- safc2, supra fuel pump
tuned w/ iinovate wideband
http://www.4agte.nl/MAP-Sensor-Trick.10.0.html

any info regard this mod would be a great help:rockon:

 

[omikron]

4efte map can accept positive intake manifold readings

 

[RGM1800]

4efte map can accept positive intake manifold readings

so its ok to use it?

 

[HYBRID]

why would you risk it?

kon

 

[AdamB]

Seems to risky to me.

 

[hardcoreep]

Works just like a resistance type FCD. I've done it, A LONG TIME AGO when I wasn't smart enough to know better, but it runs the car very lean. Its a risky thing.

 

[RGM1800]

Works just like a resistance type FCD. I've done it, A LONG TIME AGO when I wasn't smart enough to know better, but it runs the car very lean. Its a risky thing.

finally heard the right answer. your a legend. added a rep. will it lean same as hks fcd? or leaner?

 

[AdamB]

I'm assuming it would run leaner because it has no adjustment go it, it's just a fixed resistance.

 

[hardcoreep]

What I did was slice in the Boost controller line with the MAP sensor feed. It was a long hose to the back of the manifold, but Boost controllers work on the same principle which is to bleed off pressure to the actuator/wastegate to allow higher boost. So the boost solenoid bleeds off pressure to both my actuator and from the intake manifold. I was able to hit 22psi and did so for a week. However the car survived because I drove mostly at night when the cooler air didn't affect it as much. After taking an AFR reading with the stock O2 sensor I realized that the car started lean and never crossed over into rich at any point, so I realized the danger and stopped. Getting past the FC wasn't worth my engine. I think the fact that its losing air from the intake manifold as well as having a error reading compounded the problem.

Resistance type FCDs create the same error across the fuel map, just using voltage instead of actual pressure loss.

 

[RGM1800]

What I did was slice in the Boost controller line with the MAP sensor feed. It was a long hose to the back of the manifold, but Boost controllers work on the same principle which is to bleed off pressure to the actuator/wastegate to allow higher boost. So the boost solenoid bleeds off pressure to both my actuator and from the intake manifold. I was able to hit 22psi and did so for a week. However the car survived because I drove mostly at night when the cooler air didn't affect it as much. After taking an AFR reading with the stock O2 sensor I realized that the car started lean and never crossed over into rich at any point, so I realized the danger and stopped. Getting past the FC wasn't worth my engine. I think the fact that its losing air from the intake manifold as well as having a error reading compounded the problem.

Resistance type FCDs create the same error across the fuel map, just using voltage instead of actual pressure loss.

what sort of fueling do you have using this set up? did you tune it right away w/ wideband?

 

[hardcoreep]

Car was stock. At the point I did it portable widebands weren't available. We used to use a voltmeter on the stock O2 sensor for relative reference.

 

[RGM1800]

Car was stock. At the point I did it portable widebands weren't available. We used to use a voltmeter on the stock O2 sensor for relative reference.

stock fueling? can we use safc and supra pump to avoid lean conditions? and double check it via wideband?

 

[hardcoreep]

I don't believe in resistance type FCDs. If you use a SAFC you'll be altering the MAP signal anyway so why bother with a FCD.

 

[RGM1800]

because of a stock injector. it will cut past 13 psi. if you could pm me how to remove fuel cut via safc on a stock injector it would be very helpful.