Hi there, i would like to know if my car is running well or not.

My car is R53 from 2003 modified with:

17%
0% crank
380cc
GRS IC
Janspeed header
Milltek
Alta CAI
RMW Cam
Tune

With this is running 15psi, what do you think?

 

sounds about right...

but you cant judge the power from the boost pressure at least thats what i experienced
the better the air flow through your engine the less boost is generated. ( at least with the roots like supercharger )

right now i am hitting barely 11psi on a jcw pulley ( and no, there are no boost leaks or a faulty supercharger )

with my old engine ( 16% ( it was a 56.5mm pulley... not sure about the % ) and 103% crank ) i was at ~18psi at first... but while i modified it further ( head, cam, exhaust manifold and so on ) the max. boost dropped to ~14psi while power was going way up ( because of the better air flow trough the engine and lowered intake temp. )

 

15lbs. here .

 

With a 15% pulley I usually get 15.5-16 on average..sometimes as high as 17.

 

Same here!

 

20psi (peak boost on prosport gauge)

17%
Alta cold air
Alta Sportone

seems high to me.

 

You will lose boost with a more free flowing exhaust, so your numbers are spot on IMO.

I have a Milltek, 88k mile cat, 15% Alta and will hit 17psi here recently.

 

17 psi here at WOT. Sometimes it's between 15 and 16%.

15% s/c pulley & 2% oversized crank pulley, IE catback exhaust, etc.

 

mines about 15psi with 17% & 2%

 

im getting about 13psi with my mods.

 

03' MCS
17%
06' OEM Crank
JCW 380's
06' GP IC
JCW Exhaust ( - resonator )
JCW CAI
JCW Irid NGK Plugs ( 1Step)
Unichip

My Prosport gauge reads a solid 15 psi as well.

 

How about I let you all know when I install my prosport in about an hour?

 

yup....

 

Me and jan are trying to figure out why its reading so high, through PM's. Bad boost sender or somthing else.

 

I myself seem to be running high boost too. After the Fx200 and Flywheel install I put the scangaugeII up to it and Im showing as high as 23psi!!! I am stumped as to what the issue is. Ferman Mini replaced or rebuilt the SC at about 40k....Im starting to wonder if there is an issue with the Sc, i believe I have a fluttering (sounds like a vac or boost leak) when under load or boost coming from the Sc area on passenger side.

 

same problem!!^^^^^ been wondering what that knocking (fluttering) noise is when i boost.

 

Odd....I was doing some more testing with the ScangaugeII, and at idle manifold pressure is showing around 6 vac, when the gas is lightly pressed and slowing increases the RPMS, the vac drops(obviously) and then boost starts to build. But why so much... and the noise? I was told that the noise was more mechanical than air or vac leak. I dont know

 

13psi in Denver
17psi in Nashville TN
and as low as 7psi at 14,000 feet (on Mt. Evans)
It realy depends on altitude, but atmospheric pressure, temprature, and humidity are also variables. This is where turbos shine over S/Cs. On turbo models theese things affect more spool-up than max boost, turbos boost output is controlled electronicly or by some other mechanical means. S/Cs are controlled only by pulley size and flow rate. In other words you are geting whatever your setup and conditions allow with the S/C, and with the turbo it is more controlled due to higher max potential to keep the engine safe.

 

So after installation of my prosport I'm getting 10 psi on a stock pulley with CAI and one-ball. I've got a 17% on the way though!

 

Ok, so after getting some standard boost readings in this thread, how many of you all are running mechanical boost gauges and how many are running the ScangaugeII?

 

both and both show about the same amount of boost

( by the way, 264bhp on 11psi )

 

MAN!!!... then I wonder why is my ScangaugeII showing 22-24. Has to be a sign of the SC going? Im stumped!

 

My old '02 MCS had a WMW 15% pulley upgrade with a DDMWorks CAI and tune. Stock exhaust. GReddy silver-face boost gauge with warning capability. Pushed 1.1 BAR with it at 6,000 RPM. Comes out to about 15.95 PSI.

...

Will be interested to see what I get with my '06 MCS. Gauges have not been transferred yet. Got the CAI installed and an Invidia exhaust to boot. I will end up doing the same pulley and tune as soon as I get a chance. I'm gonna try to hit Way's dyno before the Dragon.

 

Could be that it wasn't set up for the proper altitude (elevation) factor in the programming mode. (just a guess)

 

Seeing a little over 10 psi @ 5300 ft altitude w/15%, using the Rev2 app on the iPhone to monitor. I replaced the belt recently and gained 1 psi of boost. I see that someone else has 13 psi at this altitude. Looks like there is more to be had. I am wondering if it is a supercharger or just a tensioner. 80K currently.