New intake letting stock turbo spool too fast?

[DFord]

Hi fellers... ...

This is a copy of what I posted at another site, but I'm not getting much in the way of feedback.....

<!-- / icon and title --><!-- message -->" A few days ago I installed a new stage 2 AFE PG7 along with an MBRP muffler and a cat delete pipe. I love the sound, but now that I've settled down a bit from being all giddy about it, I think I'm noticing what feels like less oomph when I stomp on the peddle. The turbo seems to spool super-fast now making me think it not allowing enough time for the fueling to kick in... ... ... or something like that.

I'm think I'm-a-gonna put the factory intake back in to compare. I guess I'll just swap parts back in and out in various configurations to figure this out.

BTW, this is when running stock. If I engage my Xillaraider box, it'll fuel a bit more, but also it'll boost fool and allow the stock turbo to spool waaaay up there (a result of the AFE's better air flow?) and it's kinda concerning me. "


To add to this, this morning instead of yanking things off the truck, I instead ran the Xillaraider on '2' (60hp) all the way into work which is about 45 miles. It feels like the truck drives normal again when running on '2', but still defuels when I hit my programmed point of 36psi. I figured 36lbs of boost is what any sane person would consider a resonable compromise between performance increase and detructive pressures on the stock turbo.

Any thoughts, good or bad, would be greatly appreciated.

 

[pwerwagn]

what year truck is it?? 3rd gen or 2nd??

 

[CHolman]

Do you have any codes? Click the key over three times from off to ing, "don't start it" and it will tell you if you have any codes and will give you a number... You might have set or be setting a over boost code and may be defueling...

 

[DFord]

Sorry for late reply... . I'm not receiving my thread subscription updates. Go figure.

Anyhow, I have a 2006 QC 4x4 SLT. No codes at all. Someone else mentioned to me that they think my powerband has shifted up in range which would explain things. In other words, I've lost some low-end torque since I've opened up the airflow. To regain the low-end, I'd need to start adding additional fuel to the additional air.

Sound like a reasonable explaination to you too?

 

[Vaughn MacKenzie]

Here's another thought- maybe the PG7 actually increased airflow resistance and putting the intake under more vacuum, which lets the turbo spin up faster similar to what a vacuum cleaner does when you plug the hose.



I haven't seen a lot of discussion on the PG7 but it seems I recall that because of its great filtering properties from all the layers of material the actual CFM isn't that high.



Vaughn

 

[Joseph Donnelly]

The Pro Guard 7 works fine at 700 hp. If the turbo spools faster, it is getting more “expansion of hot gases” meaning more fuel, not just more air. Without dyno testing, you are just guessing about your power levels. However, my testing shows no loss in power from the aFe intakes I have dyno’ed. You are probably adding more fuel and power with your fueling box than the stock turbo was intended to work with. I would not run the turbo over 35-36 psi boost.