Question : EGR Mod - PCM controlled BOV or WasteGate

[Schmieder]

Is it possible?

The EGR mounts could be sealed up and the EGR device itself could be used to meter exhaust PSI under certain circumstances.

One would be able to bleed off psi at specific rpms, load or whatever conditions the tuner has available.

Heck, you could design it to disable the turbo during warm up or activate as a back up safety device incase the wastegate fails to properly regulate pressure.

What do you guys think. I can't see any reason why it would not work. After all, it is only a variable valve controlled by the PCM.

In fact, it could be rigged up to do just the same things on the intake side. A PCM controlled Electronic Variable BOV.

[kris gtwhat?]

but you need the bov to keep the pressure from building up in front of the tb, not in the intake

[robertisaar]

What do you guys think. I can't see any reason why it would not work. After all, it is only a variable valve controlled by the PCM.

In fact, it could be rigged up to do just the same things on the intake side. A PCM controlled Electronic Variable BOV.

this is the same concept that us OBD1 guys use for a few things, namely WB02 reading through the datastream. there was also a suggestion of running VVT through the shift light driver, which honestly, could work well since there are all the necessary condition based variables that would allow for it.

i'm sure something could be worked out with the OBD2 PCMs to do the same...

[Schmieder]

but you need the bov to keep the pressure from building up in front of the tb, not in the intake

Thats why I noted to remove the EGR device and reattach where needed, before the TB.

It could be triggered to open under measurable boost AND 0-5% TPS

Since the only time there is boost at 0-5% throttle is just after a run when the turbo is all spooled up. Once the boost is removed it will close again since conditions were met. At WOT it would not open under boost since the Throttle would be above 5%.

Possible tuning/programmed benefits

Program the EGR-BOV to open if excessive boost pressures are encountered.

Open just before the rev limit if one chooses to have a rev limit, to help prevent grenading the engine under boost when the rev limit cuts off fuel

Bleed off pressure under lean conditions as a safety.

Programmed as a boost controller where one could dial in how much boost is bleed off. An example would be a switch that could disable the bleed off to determine between 'normal' and 'performance' modes. Performance being the natural boost levels.

In fact, I bet if the EGR was able to be controlled fine enough, it could act as a variable vacuum/boost bleeder for controlling FMU's. One could control fuel pressure boost through tuning the PCM. Could be a VERY effective fuel psi controller, matching an FMU with a pcm controlled vacuum line bleeder.





Possible to bleed off boost if knock is encountered

[Schmieder]

this is the same concept that us OBD1 guys use for a few things, namely WB02 reading through the datastream. there was also a suggestion of running VVT through the shift light driver, which honestly, could work well since there are all the necessary condition based variables that would allow for it.

i'm sure something could be worked out with the OBD2 PCMs to do the same...

I love hacking stuff!

Fun, isn't it.

I'll always remember duct taping a can of starting fluid to my moped at the age of 15. The spray needle was directed into a small hole in the air intake box. A small wood block was fastened to a cheap door hinge and the hinge was tightened to the bike frame. The wood block sat just on top of the nozzle, a cheap activation pedal.

I was like, OMFG, LOL. IT WORKED, and it worked good. Almost TOO good. Rev'ed that freaking moped up to 45-50 mph. Under natural conditions it was hard to get to 34 mph.

It even had that fast wind up sound to it. It was a true 'ghetto' boosting system.

[robertisaar]

it's either doing it that way or actually going through and writing new algorithm and possibly redfining the major and minor loops... assuming there are enough left over quad drivers/etc...

[Schmieder]

One day our vehicle PCM's will catch up with modern computing and act more like a laptop system.

Bluetooth wireless access, P&P upgradable components such as memory, processors.

Visual Basic style programming

Extra USB ports with optional USB based sensors. Such as measuring humidity, photo-sensitivity, audio-sensitivity.

Easily downloadable settings anyone can use, ect.


I wondered if it is possible to rig a PS3 to operate the PCM language. Mapping the functions out to specific USB channels to match the wires exteranl the PCM. It would be one fast PCM, thats for sure.

[robertisaar]

that's the thing: due to it all being written in machine code, it only needs a 1-2MHz processor(in the P4-P6 OBD1 ECMs) to efficiently do all of the things it does now. making it "easier" makes it more inefficient, and would then require a more powerful(and likely less reliable) set of hardware...

"Easily downloadable settings anyone can use"

don't count on it. the EPA already has all of the major manufacturers by the balls when dealing with anything emissions related, so i find the idea of that happening not likely.

"I wondered if it is possible to rig a PS3 to operate the PCM language."

possible, but entirely unnecessary, not to mention the previous reliability statement...

[pocket-rocket]

I wouldn't waste a perfectly good PS3 to run my car when the slow black box under the hood runs it just fine. Besides, if you can afford to throw a PS3 at your car for a PCM, you can afford tune/control the car the right way.

[Superdave]

One day our vehicle PCM's will catch up with modern computing and act more like a laptop system.

Bluetooth wireless access, P&P upgradable components such as memory, processors.

Visual Basic style programming

Extra USB ports with optional USB based sensors. Such as measuring humidity, photo-sensitivity, audio-sensitivity.

Easily downloadable settings anyone can use, ect.


I wondered if it is possible to rig a PS3 to operate the PCM language. Mapping the functions out to specific USB channels to match the wires exteranl the PCM. It would be one fast PCM, thats for sure.

god i hope not.. then every punk kid will be disabling his speed limiter and raising his rev limiter to 10K.


I'm happy that i can plug in 1 USB and 1 serial plug to my laptop and have access to everything in the ECM and make changes on the fly.


I tried bluetooth datalogging, the adapters i used were very high end but wouldn't support the ALDL comm (simple serial with no handshake). Total bluetooth tuning with OBD1 wouldn't be out of reach, it would just need a separate controller.

I have datalogged over fiberoptic cable, worthless but cool.


As for the PS3 comment, lol.... the '7730 is plenty fast for what it needs to do.

[Schmieder]

I know, I know.

Just horsing around in theory. Giving my mind a break from crunching turbo info, requirements, budget, planning, ect.