running a 9psi pulley with 4psi loss
Got the 11psi on the way from SOS - dyno time friday night. Im shooting for 7-7.5 on the gauge/mainfold.

 

It seems like they were saying before that the boost loss was .5-1lb and now they took that information off of their site.

 

Let me know how it works... im curious

Chris mentioned my setup, i bought it from a member who was seeing 8 PSI out of the 3.8" pulley but all i have been able to get is 5. Doing the ABEC-9 Rebuild and will be throwing the 3.2" pulley on it. Im really curious what you will see with the 3.4"!

 

My take on things to this point. Fmic that loses 4 psi is a big consideration. Its going to put more wear on the blower just to run a minimal boost pressure, and it limits your ability to get over 10-11 psi. So what does that mean? You will never make it over 350-370whp with this set up wile over spinning it. How much heat does the novi blower produce spinning with a 3"-3.2" pulley? Well I couldn't touch mine without burning my hand at 5.5psi, at 14-15psi is the fmic enough to cool the intake down to what the AC can do with the blower spinning at 10psi? So I guess what i'm thinking is at what point or boost level does this fmic run at its most effective for the cooling it provides on the Comptech kit?

I think I will stick with my .5 boost loss of my AC and run water/meth injection for additional cooling beyond what any fmic can do.

 

I'm curious too John, maybe you will get lucky and the boost loss will decrease from 4psi to something like 1-2psi which has been mentioned before. Its obviously one of the best constructed fmic's, nice piece, but damn maybe its just not the right one for the Comptech combo. We'll see with the smaller pulley I guess

 

Maybe you should try to figure out what your problem is, before you just keep upping the pulley.

I'm making 7.5-7.7psi through the 9psi pulley and UR FMIC.

 

So why are others making 5.5? There is so much unsure data about boost loss on this kit. All I can do is tap the blow output and fit a boost gauge and see was its dumping. I cant seem to find any leaks on the kit, the blower was just rebuilt. Mar car is down and I would love to find the problem but what can I do? How else can I check for leaks or what the hell else can this be if not the loss in the system?
Also I want to cap out at the limit of the FPR. I dont want to up the boost past 7-7.5 and Im happy. For now . If I want more the FMIC will need to be swapped to AC I guess.
My take - is it worth it?
Its a great looking kit and fits good but if this 4psi loss is honestly normal than, you can polish a hunk of sh!t but in the end you just have a shinny hunk of sh!t.

I still trying to find a leak somewhere, I feel like thats just too much to be "lost" within the system

 

Do you have t-bolt style clamps on your pipes, or do you have worm clamps?

Are you 100% positive (and you've checked in the last day or two) that your silicone couplers are completely intact and have no rips/tears/small holes?

I would take off your intercooler, plug one end of it, and use some kind of fog machine to test for leaks in it. It may look find and be relatively new, but there could be a manufacturing defect.

How is your blowoff valve attached? Screw on, welded, what? Make sure no leaks are coming from there.

Where is your boost gauge hooked up to? Try hooking it up to the blowoff valve line.

3psi off the stock pulley I understand, but on 9psi there should be no reason you're not getting 7+ psi.

 

I have worm clams byt there tight. I can try t-bolts
Couplers look good but Ill give them the once over again.
My tunner has a 4inch plug that can block and fill with air so Im going to need to down size to get it to fit one end and presure test.
BOV is attached with the large snap ring and I will spray it down when on the dyno
Gauge is T'ed into FRP line but I will try to move it to BOV line. (didnt know that would work for it)

We'll see this weekend.

I might add it put down 295 as is. A little shy for 9psi, no?

 

The worm clamps are most likely fine. I blow a pipe off every now and then on the lines that still have worm clamps, but otherwise no leaks.

Make sure you try the thing your tuner has. That's the best advice I can give you right now.

FRP line is more than fine for the gauge. Have you replaced the line recently with a piece that won't crush under vacuum? The line could be pinching slightly under vacuum and giving you a false reading. Have you tried another gauge?