A

amongstit

New Member
Yesterday I removed my EGR valve and fitted a blanked version,on this blanked unit is a plug/bung for the vacuum feed pipe that was fitted to the working EGR.
Today I removed a PSI power box from my other P38 which has a functioning EGR valve and was running with the power box connected to this pipe.
My question is can I still use this power box on my P38 without the EGR and without the vacuum feed pipe or will I need to reconnect elsewhere?thanks.
 
To the best of my knowledge the powerbox should be plumbed into the map sensor and not the EGR
 
SpudH said:
To the best of my knowledge the powerbox should be plumbed into the map sensor and not the EGR
Click to expand...

Yes it was on my other vehicle between the MAF and EGR with a T piece,I'm guessing I can just connect straight to the MAF now I have no EGR?
 
amongstit said:
Yes it was on my other vehicle between the MAF and EGR with a T piece,I'm guessing I can just connect straight to the MAF now I have no EGR?
Click to expand...

There is no vacuum pipe to the MAF. (Mass airflow sensor) There is a pressure pipe to the MAP sensor. (Manifold absolute pressure sensor). I don't know a lot about the PSI box. But i cannot think of a reason it would have a vacuum pipe to it. A link to the MAP sensor pressure pipe yes, but not to the vacuum pipe for the EGR. Bet it didn't work too well.
 
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wammers said:
There is no vacuum pipe to the MAF. (Mass airflow sensor) There is a pressure pipe to the MAP sensor. (Manifold absolute pressure sensor). I don't know a lot about the PSI box. But i cannot think of a reason it would have a vacuum pipe to it. A link to the MAP sensor pressure pipe yes, but not to the vacuum pipe for the EGR. Bet it didn't work too well.
Click to expand...

I'm quite sure it's to turn the box on and off,is the MAP sensor what was on the side of my EGR valve?
 
amongstit said:
I'm quite sure it's to turn the box on and off,is the MAP sensor what was on the side of my EGR valve?
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Map sensor is bolted to left hand top of fuel filter, small unit with a electrcal plug in it and a pressure pipe going under manifold. This tells ECU manifold pressure for fuelling purposes. As far as i am aware PSI powerbox does not have a pipe to it. Others will know how it's fitted i don't. But cannot see it needing a vac pipe, pressure pipe maybe, vac pipe no. Data will know ask him.
 
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The version of the power box with a pipe connection Tee's into the pipe from the manifold to the MAP sensor located on the fuel filter housing. Newer versions just connect to the electrical side of the MAP sensor, no pipes involved. The EGR has bugger all to do with it as far as I'm aware. The connection by pipe or electrical connector is to tell the power box when the manifold pressure is positive, i.e. the turbo is pressurising the manifold. This is the point when the power box starts to modify the fueling which is why it exagerates the turbo cutting in effect.
 
Datatek said:
The version of the power box with a pipe connection Tee's into the pipe from the manifold to the MAP sensor located on the fuel filter housing. Newer versions just connect to the electrical side of the MAP sensor, no pipes involved. The EGR has bugger all to do with it as far as I'm aware. The connection by pipe or electrical connector is to tell the power box when the manifold pressure is positive, i.e. the turbo is pressurising the manifold. This is the point when the power box starts to modify the fueling which is why it exagerates the turbo cutting in effect.
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That's what i thought Keith. Bet it did not function too well on the vehicle he got it off.
 
There is a vacuum pipe to the egr solenoid and and of course onto the egr valve. I think it'll be the egr solenoid you're seeing next to the egr on the manifold.
I guess the powerbox was just teed into the wrong pipe on the old car.
As wammers said, bet it didn't work great!
it would use leccy signal from ecu to turn it on and off, if it needed that.
 
jonbill said:
There is a vacuum pipe to the egr solenoid and and of course onto the egr valve. I think it'll be the egr solenoid you're seeing next to the egr on the manifold.
I guess the powerbox was just teed into the wrong pipe on the old car.
As wammers said, bet it didn't work great!
it would use leccy signal from ecu to turn it on and off, if it needed that.
Click to expand...

The EGR solenoid is on the right rear of engine bay looking from front. On scuttle behind EAS block. It should have vac pipe to it that runs under manifold from vac pump on front of engine. Then a vac line back to EGR valve. And a small filter. The vac pipe to EGR valve just fits straight on it, nothing else on it between solenoid and EGR valve.
 
wammers said:
Bloody hell if i had known you wanted info on onions i would have put you on to Nigela Lawson.:D:D:D
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I might take you up on that Wammers,she might be twice my age and body weight but I'd slam that woman like my life depended on it,the posh sod.
 
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