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Boost...


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Hello there...Until last week my car was completely stock and boost pressure was 0.8 constant...Last week I installed a BMC air filter and I flashed my ECU on a very well known and respective ecu tuner...I am not going to name the tuner since I believe he is about to fix my following problem...The problem is that the max boost pressure I see is 0.8 to 0.9 Not even a spike of 1bar...i was expecting at least 1.0 bar with spikes of 1.1 My worst problem is that the car goes in safety mode with max boost 0.5 and my OBD reader says P1250(over boost pressure)How on earth could this be possible without even reaching 1bar?I mean this limitation should occure at about 1.4 bar...

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I'm having a few boost issues at the moment also, only achieving 0.6 bar rather than 0.7-0.8 bar.....

Anyway, i would suggest that even though they 'tuned' your ECU to demand more boost, if the 'safety' limit hasnt been altered correctly or got corrupted, then maybe this is why your ECU thinks your are over boosting and going into safe?? Remember, its all parameters and limits in those things and it sounds like one or two aint right?

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I dont' know exactly what they did when they flashed your car, but I had the same problem when I replaced the Diverter Valves. I had a leak in the hose to one of the valves and it threw a CEL that indicated overboost and dropped down the the boost level, however in my case it was a vacuum leak caused by faulty hose clamps. I'd say that Fastboy is on the right track....the ECU is generating the wrong message and is creating the signal of an overboost condition even though you aren't in overboost. This is affecting your ultimate boost threshold. So much for a theory from a guy with no MIT degree.

Usually, when you have a problem like this, you go back to the way things were BEFORE you made the change and see if the condition persists. It's too coincidental that you have a flash and now a problem. I hope their support folks are a help to you.

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I dont' know exactly what they did when they flashed your car, but I had the same problem when I replaced the Diverter Valves. I had a leak in the hose to one of the valves and it threw a CEL that indicated overboost and dropped down the the boost level, however in my case it was a vacuum leak caused by faulty hose clamps. I'd say that Fastboy is on the right track....the ECU is generating the wrong message and is creating the signal of an overboost condition even though you aren't in overboost. This is affecting your ultimate boost threshold. So much for a theory from a guy with no MIT degree.

Usually, when you have a problem like this, you go back to the way things were BEFORE you made the change and see if the condition persists. It's too coincidental that you have a flash and now a problem. I hope their support folks are a help to you.

Chuck, when you had the leak by faulty hose clamps, was it near the diverter valves? Did you experience HIGH idle?

Please let me know~

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The leak was at the bottom fitting....the DV has two outlets.....one goes out at a right angle into the "F hose", and the other straight down. I hadn't properly secured the bottom fitting and reused the spring clamp rather than buying a new screw hose clamp. It did not alter the idle....but a searching idle is sometimes indicative of sucking air from somewhere.

Take a can of ether or other flammable spray (carb cleaner) and spray it near the fittings where they attach to the hoses....if the idle picks up, you have found a leak. Don't use too much spray....it is flammable. I use ether that comes in a can and is used for starting engines that are hard to start.

Edited by Chuck Jones
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The leak was at the bottom fitting....the DV has two outlets.....one goes out at a right angle into the "F hose", and the other straight down. I hadn't properly secured the bottom fitting and reused the spring clamp rather than buying a new screw hose clamp. It did not alter the idle....but a searching idle is sometimes indicative of sucking air from somewhere.

Take a can of ether or other flammable spray (carb cleaner) and spray it near the fittings where they attach to the hoses....if the idle picks up, you have found a leak. Don't use too much spray....it is flammable. I use ether that comes in a can and is used for starting engines that are hard to start.

I tried some carb cleaner and no success....

The porsche pressure testing cap was $160... so I just fabricated a pressure tester last night so I'll see if I can locate the leak. Hopefully, I won't need to get a smoke machine and locate the leak quickly..

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