devs2k

You can try tightening the wastegate actuator arm. In my Greddy setup, the arm was initially too lose and I'd hit 7.5 psi at 4000 rpm and drop down to 5.5 by redline. After tightening it, in summer/spring it'll hold 7.5 psi to redline.

During the winter, it jumps up to 10psi, but AFRs are in check.

No boost controller

SgtB

That's a good point too. the spring can only hold so much.

Joey: It really doesn't matter how soon you crack it if you get the duty cycle correct. All the crack setting does it tell the controller when to start pulsing the WG. The 18g spools so fast that I feel cracking any higher results in spikes an unpredictability. You can gain quicker spool with a higher cracking pressure, but I'm sure we can agree that this kit doesn't need it at all.

JoeyBalls

makes sense, hows the spool up?

TRBOKEV

[QUOTE=JoeyBalls,Apr 8 2009, 10:14 AM] 3.5, maybe thats the problem, why do you want it to start to open at 3.5psi??????

I dont know how the AEM works, but if I understand this correctly you want the W/G to open at 3.5psi?

g352s2k

spool up is fine... I still feel the midrange powa. Just need a better tune and figure out how to hold boost.

dsddcd

Okay now the plot thickens, I intalled a pressure sensor on the compressor discharge and found that there was a very large pressure drop (1-3PSI) in the system. We took off the front end and could not find anything in the intercooler. Anybody got any idea's or measured the deta P accorss the system? Unless I get some good info I am going to take more readings on each side of the intercooler.

Map Pressure (LT Blue)
Greddy Sensor (Blue)

HMFIC

when i had an internal WG'd turbo on my other cars, i had the same problem.....went to external... problem went away...

dsddcd

I originally thought it was the wastegate first also but that is defiantly not it? The turbo is holding boost and actually I see that it is creeping about a 0.5lb , there is something else going on.

MugenRioS2k

RE do your data logs.


The stock MAP is in Voltage and the Greedy pressure sensor is in psi.


In the data logging screen select "Pressure Sensor PSI" and "Greddy Pressure Sensor PSI (#)"

The # represents the option port you have the sensor plugged into.

Both should show up in PSI


And verify that both are set on the same scaling by double clicking on the sensor in the list on the right.

dsddcd

After all the issues I have experiences with changing units I would prefer not to change it to PSI. With that in mind this test was run with the Greddy sensor scaled for 14.7PSIA to 26.6 PSIA and the stock MAP is scaled from 2.85V to 5V, which was yielded from my calibrations and verified by yours. To prevent the inherently erratic readings from the Greddy sensor (See Graph Below) I have inserted a snubber a few inch's inline of the pressure sensor. Independent to the scale the tow lines are diverging at CFM increases and this is why I believe there is something clogging the intercooler.

The kit held boost on my car perfectly (See Graph Below) and was used for a total of 1000miles before removing and personally installing on his car.
With no apparent clogs in the IC piping I am at a loss trying to figure out the problem.