Nope. It there was, we wouldn't be spending $1k on ECU upgrades . When the ECU sees 20psi when its only trying to make 15, it will throw codes and try to compensate, in turn running like crap.

 

Well how about you just do 18 or 19psi instead?

 

I don't know what the threshold is, but I do know that when the ECU sees a higher boost than it is trying to make, it uses the OEM boost control solenoid, via a PWM signal, to control the boost level.

 

The reason I asked is that I have the RICA Stage 2 but am only making 15psi max sustained. I've just about given up diagnosing my low boost issue and as a last resort was contemplating installing a manual boost control. Assuming the ECU is calibrated correctly it should allow manifold pressure of up to 24 psi with stage 2 using a manual control valve.

I've also heard that you can use an electronic boost controller in place of the TCV like the ones made by Greddy.

 

The reason I asked is that I have the RICA Stage 2 but am only making 15psi max sustained. I've just about given up diagnosing my low boost issue and as a last resort was contemplating installing a manual boost control. Assuming the ECU is calibrated correctly it should allow manifold pressure of up to 24 psi with stage 2 using a manual control valve.

I've also heard that you can use an electronic boost controller in place of the TCV like the ones made by Greddy.

you're playing with fire...i know its frustrating not having the power, but when you don't know for sure what the true cause is, it's dangerous to start throwing boost at the engine. If your engine is pulling timing or boost because of a dangerous condition it is sensing, you could easily mess things up by overriding that. My suggestion is to keep working to try and figure out the problem first.

 

The reason volvo uses the low pressure wastegates ie 2-4 psi is becuase they want eletronics controlling the fun not mechanics... If it was as easy as using a 20 psi wastegate spring actuator or 100.00 dollar boost controller you would see alot more fast Volvos. Once you excced that pressure threshold of more than 8 psi on the sensitive models of the Bosche ME7 ECU it starts throwing codes as phuz stated... I at one point had mine cranked to 12.5 psi and that was all I was getting... Only until I set my wastegate back within spec and did a hard resett did I begin to really fly!!! (6.5 - 7.0 PSI)

 

Also you don't want to combat a leak or problem with a type of work around when I think you will be just adding to the mess...

 

Many people with 850s and X70s run an MBC in conjunction with their TCV to get the pressure they want. It should not throw any errors and its the same TCV, just needs to be set up properly.

EDIT: Just read above info on Bosche ME7 ECU sensitivity.

 

what if the boost BCS was taken out of equation (just connected electronically). I think that would work... you'd just have to figure out what's the "safe" boost to run is before you throw the code.

I did the same thing with my old S40 (1.9T engine) before I tuned it. The stock boost was at 7, the overboos CEL would come on at around 15PSI. So I cranked-up the manual boost controller to 14PSI and at the same time took the BCS out of the equation but left it on electronically, that way no codes are thrown. It was running fine, and 14PSI was sustained and it did not drop - it held it through the gears.

Here's the Video on how to do it...at the end there's a clip of the boost holding

Here are some pics:

 

I sense some risky business... :/

 

hmmm can u do this to a c70 2.4?

 

also how much more power did u get with that controller installed?

 

No power increase with the controller. It's simply an upgrade to the factory part which tends to fail prematurely.

 

SOB. That's brilliant.

 

Aren't you dumping metered air into the atmosphere by not venting back to the intake pipe?

 

I think so- The Great NY did something like that, and bumped his boost up.

 

You can run a MBC and it will help boost onset be quicker.

You can also run the TQ application to auto-reset pending over boost codes so you can run 18psi without any problems.

 

Won't just run lean anytime you get above stock boost?