Boost question

[USAF Long]

1st gear usually spikes around 12 psi. Last night got a 23 psi spike.

2nd gear sometimes hits 15. 3-5th on the floor 9-10 psi.

Was told car has APR tune on it. I would assume it would hold 17-18 in all gears with a 20-21 spike.

Looking to put in bigger injectors and Motoza 1+ tune. Should I do that first and see how it behaves or should I plan on replacing N75 as well. No boost leaks that I can find, and holds 24 in vacuum at idle. Runs fine. No codes.

[KHARDa4]

Digital boost gauge?

[USAF Long]

This is from the Torque app and OBD II bluetooth adapter. So it's what the computer is seeing.

[ECS Tuning-Audi]

I wouldn't be surprised if the numbers were a bit fudged. Computer reads in bar not PSI so the conversion might be slightly off. You'd want a mechanical gauge to really see what the manifold pressure is actually doing.

Jason

[SJorge3442]

Also, my torque App says that I have some boost when I step on it hard......I have a 3.0. Not sure whats going on where, but I totally don't have any vacuum leaks, as I have a solid reading of 23 vacuum at idle. I think this is a calculated value from the app and ECU (using manifold pressure) and not an actual value. You need a real boost gauge to properly read boost/vacuum.

[USAF Long]

I had one in a Podi pod, but never installed it, and it got left somewhere... now I guess I'll order another one. Either way, are my numbers looking stock? Lets say the 23 psi was a fluke. 12 spike and 9-10 hold. Is that what stock boost is?

[ECS Tuning-Audi]

12psi spike seems a little high for stock programming. Usually it will hit about 10 and then fall off to 5 toward redline.

Jason

[eljay]

I tried tweaking Torque with my mechanical Podi gauge and I could not get it to reliably and consistently display the same pressure as the Podi gauge.
Start by adjusting the pressure factor in the vehicle profile in Torque. -14.7 would be a value for sea level, I believe: http://torque-bhp.com/wiki/Boost_Adjustment

[USAF Long]

I'm around 4200 ft elevation.

5 psi is stock boost? Holy shit these things must be slow stock.

[KHARDa4]

Recalibrate the boost gauge if it is digital. Mine was doing that showing boost of 7-8 psi with no boost leaks idle was 23 to 24 in. Calibrated my digital boost gauge and everything was fine.

[Charles.waite]

I'm around 4200 ft elevation.

5 psi is stock boost? Holy shit these things must be slow stock.

No 10psi is stock. It just stops to around 6-7 be redline. The k03 can't keep up, it's too small.

Tuned you should be seeing 20-ish psi. On my apr 1+ I would see 22-23 psi spikes all day and it would taper to 15 or so by redline.