boost controller vs PCM

[ChefTank]

am i trying to compare apples to oranges or are these two option for the same category. all i want is a tunable PCM but from what i am being told is that the closest thing to that for my "big Blue Betty" is a boost controller. i like some of the features on the BC but the PCM changes a couple of things the BC doesn't, BUT these peramiters are not adjustable... or are they? (raise right hand pinky to corner of mouth) anyone? what is working for you guys?

[Mean Green]

Originally Posted by ChefTank

am i trying to compare apples to oranges or are these two option for the same category. all i want is a tunable PCM but from what i am being told is that the closest thing to that for my "big Blue Betty" is a boost controller. i like some of the features on the BC but the PCM changes a couple of things the BC doesn't, BUT these peramiters are not adjustable... or are they? (raise right hand pinky to corner of mouth) anyone? what is working for you guys?

You really need to really learn a lot. Go here PTCrew.com - Learn it or Burn it. Lots of knowledgeable gearheads.

[turbo_pt2003]

I added a boost controller to my 2003 gt and raised it to 10lbs of boost... The difference was amazing and the car is running just fine.. and i'm perfectly happy with it.

[FamilyGT]

Originally Posted by turbo_pt2003

I added a boost controller to my 2003 gt and raised it to 10lbs of boost... The difference was amazing and the car is running just fine.. and i'm perfectly happy with it.

You should have already been running 10-13 psi boost on a stock pcm.

[reklaweelmada]

Originally Posted by FamilyGT

You should have already been running 10-13 psi boost on a stock pcm.

I second that. I have an 03 GT and I run 13-15.

[FamilyGT]

Originally Posted by reklaweelmada

I second that. I have an 03 GT and I run 13-15.

13-15psi? It must have been in the summer time. I haven't owned mine that long yet and so far during the winter I have only seen a consistant 11psi. With only 30k miles on the clock it is still a baby. LOL. Hot days will cause the boost to rise in order to meet the computer's torque demand.

[Mean Green]

Stock GT is spike to 13 and drop to 10-11 at redline. In hotter weather you will run a little higher OR your boost gauge might be off if it isn't hot. Wouldn't be the first time. Spiking higher in the summer is because the air isn't as dense. Spiking lower in the winter is because colder air is more dense.

[reklaweelmada]

Wouldn't it be vice versa...colder air being more dense causing higher boost? Make it easier for the turbo to make more pressure? I'm not sure.

I just put on my boost gauge about 2 days ago and thats what it has been reading... 13 on average...drops down at about 5700rpm because the little turbo runs out of breath.

[FamilyGT]

Originally Posted by reklaweelmada

Wouldn't it be vice versa...colder air being more dense causing higher boost? Make it easier for the turbo to make more pressure? I'm not sure.

I just put on my boost gauge about 2 days ago and thats what it has been reading... 13 on average...drops down at about 5700rpm because the little turbo runs out of breath.

Think about what you are saying. The cold air allows the engine to achieve the hp and torque without so much boost. Thats why cold temps pull less boost. The computer is pulling boost because the requirements have already been met for the power at a lower level of boost. cold air makes it easier to get higher boost if the computer wasn't controlling it through a torque request. The stock GT turbo can handle up to 20psi before loosing its breath and still be reliable. 13 psi is a detuned version of what it's capable of.

[Mean Green]

Originally Posted by FamilyGT

Think about what you are saying. The cold air allows the engine to achieve the hp and torque without so much boost. Thats why cold temps pull less boost. The computer is pulling boost because the requirements have already been met for the power at a lower level of boost. cold air makes it easier to get higher boost if the computer wasn't controlling it through a torque request. The stock GT turbo can handle up to 20psi before loosing its breath and still be reliable. 13 psi is a detuned version of what it's capable of.

Dat da truth