Has anyone tried this mod? Results? Pros/Cons? Haven't heard anything about it on the forums.

From the Joe servo site:

EBP/MAP sensors mod
The EBP sensor (exhaust back pressure) measures just that, exhaust back pressure. If it gets too high, the engine will back off on the amount of fuel. The MAP (manifold air pressure) measures the amount of boost and adds fuel as it gets higher. EBP will always read higher pressure so the idea is to connect the MAP to the exhaust to read a higher reading. this will cause the a lot more fuel to dump much faster. I have not tried this mod myself, but the people who have say it is amazing. The EBP sensor can be found next to where the heater core hose plugs into the water pump just behind a belt pully. It is a three wire sensor that plugs into a metal tube that runs to the exhaust manifold. I think it is an ANC fitting on the end of it. using a "T" fitting, plumb a line to the MAP sensor. You will need to add a brass filter inline because soot may clog the MAP sensor. Plug the old MAP hose somehow. You probably want to keep the boost gauge reading intake boost though. If you are a real adventurer, plug the EBP snesor where the MAP used to be and you will get even a bigger improvement.

 

The first gen PSDs make in the high teens for boost, completely stock. So by sending a stronger signal to the MAP it will fool the ECM into thinking the engine is seeing more boost than it is, more boost requires more fuel to keep the mix right.
Maybe Ill try this trick later, I have to go assess the situation.

 

Would this be wise without a wastgated turbo? Where is the line of having too much boost? I guess it wouldn't matter if your running gauges...

 

well our turbos are internall wastegated. I think I found the line, but I never saw a wiring harness. Is it possible the line is what controlls the wastegate? I have no idea how internal wastegates work.

 

The problem is that the PCM will defuel at about 22 PSI boost. If the mod you described signals that much boost you will accomplish the opposite of your goal.

I had to put a preassure limiter in the MAP sensor line to keep from defueling with my chip and propane injection. I now get 30+ PSI at WOT with chip on max and propane on

 

would anybody who knows, care to get into detail about the outcome pros and cons of doing this?
I found the sensor and line I beleive, its on the back side of the HPOP res. The origional post must be for a 2nd gen PSD.
Im just curious to know more.

 

It looks like Im going to have to guinea pig this one on myself. I just cant see the exhuast back pressure being more than the boost tho, but maybe Im wrong.

 

Ive never heard of this modification before. Would be curious to try, but I would be careful. I have a edge evolution and I can push over 30PSI no problem. But I can also get the computer to throw a "Over backpressure limit" or something on those lines. If you try this mod, post your findings I would like to hear if it works.

 

Oh one more thing, just as an FYI the 94-97 PSDs have no factory wastegate on them, only the EBPV(exhaust back pressure valve). Good luck

 

I thought it was internally wastegated...?
If I can find any of the pieces out in my junk pile I need to try this I might just give it a stab and putter down the block.

 

Nope no waste gate on them. Once you go to the new body style 99s they have a waste gate.

 

so how does it purge on decelleration?

 

Purge? Only thing a waste gate does is control the max boost level that can be acchieve by the turbo.

 

Why would a turbo have to purge on decelleration?

 

I thought it wasnt good for the turbo to boost on decel. I guess its different with a diesel also tho, there are no throttle plates in the intake tract to stop flow into the engine when the throttle is let off.
But on topic of the origional post, I disconnected the EBP sensor and it didnt do anything. So I figure it must be gummed up, I never tried swapping lines either.