Has anyone ever tested this? Got 5.3 procharger truck im working, had it on the dyno so I did some testing. Had a boost gauge at the head unit, after the intercooler, and inside the intake manifold.
At peak rpm it had

23psi at head unit
19psi after intercooler
14psi inside the intake manifold

Now the drop in the intercooler doesn't surprise me, but what did is that we lost close to 5psi of boost going through 2 feet of pipe, the tb, and into the intake manifold. This was confirmed with 2 gauges and the map sensor. It seems to have this drop across the board, from start to finish it just has that much drop. Has anyone ever tested this before? Just want to see if this is normal or if we have a problem. The cold side has all been pressure tested but the intake manifold itself has not. It's a stock 04 truck intake btw

 

hmm... maybe the stock throttle body and 3" tube is a little bit of a restriction.

 

What MAP sensor are you using? A 2 bar will only read about 14. I would use the same pressure gauge in all 3 areas to eliminate any variance. I have seen engines with a 3" throttle body over 3500hp. I think that was restricting, but shouldn't be at your power level.

 

I tryed two different gauges at the blower, both where the same, one of those and the one the dyno had, they where both the same, use two manual gauges at the intake and we have a 3 bar map. Im very confident these numbers are all right. Iv seen before that the electronic tb can close sometimes, but it will normally throw it into reduced power mode, and it's never done that before. I was going to test my turbo car to see what it would do but it has a car style intake which is completely different. So I was just going to see if anyone had ever tested this. I hate seeing the blower make almost 10psi more boost then what the engines getting. Power seems right for 14psi, it was 570 on a mainline dyno, which would be around 650 on a dyno jet.

 

Pressure will always be less in manifold or plenum, due to the greater area. Perfect example of a bottle neck.

 

Thus why the MAP sensor is not located in the intake tube.

I don't know though....isn't a boost signal for gauges located on a turbo housing? Does everyone see more boost on the gauge than the MAP shows? Hmmmm

 

Its very close to the intake valve as well. I'm sure with enough resolution and sensitivity, it could be mind boggling with all the pressure waves and **** going on in there.

 

Thinking of trying a race style intercooler with a 4in outlet then run 4in the hole way up to the tb, then try an open plenum intake like a holley high ram and match it with a big tb. If I could get 22psi in the intake instead of 14 without changing the pulley.. this dude will pick up over 200hp

 

That could make improvements, but most likely you will see a bit more boost at the manifold, and a bit less at the turbo because the intercooler restriction (IF the current one is a significant restriction) will be gone. Remember, Boost is a measurement of restriction down stream, not airflow or volume. 22 down to 14 is huge though. Something HAS to be up unless this discrepancy between gauge and MAP is common....

 

Have you compared pressure ratio drop between gauges versus RPM? The biggest rate of pressure ratio drop will tell you where the worst choke point is. Then you can focus on improving that.