[s-cars] 5" gone missing

[Philip Mische]

I assume you mean 5 psi.  Let's keep our units straight here.  If you're
going to talk inches you have to specify water or mercury...or whatever.
For the record:

1 atmosphere = 14.7 psi = 1.01325 Bar  101,325 Pa = 29.92 inches of mercury
= 760 mm of mercury = 33.91 ft of water = 10.34 m of water = zero on the
typical boost gauge at sea level.  To be correct when measuring pressure you
should add 'a' for absolute pressure or 'g' for gauge pressure, eg. if
you're running 25 pounds of boost that's 25 psig or 39.7 psia.  Pressure
differences of course are just in whatever units you're in.

Thanks.  I just had to.

P

----- Original Message -----
From: "steve powers" <steve at thepowers.net>
To: "'* S List'" <s-car-list at audifans.com>
Sent: Thursday, October 30, 2003 11:50 PM
Subject: [s-cars] 5" gone missing


> We've been trying to track down the last 5" of boost in my car.
>
> It's a 95.5 with:
>
>   - new K26/27 2B turbo
>   - RS2 injectors, MAF, FPR
>   - IA RS2-style exhaust manifold
>   - 7A exhaust cam
>   - new Samco hoses, constant torque clamps throughout
>   - new Forge BPV
>   - new WGFV
>   - new POS
>   - new vacuum/boost hoses in engine compartment and footwell
>   - new clamps for above
>   - IA Stage IV w/ 3 Bar sensor
>   - Stromung exhaust
>   - older metal x-over pipe
>   - older metal capped IC
>
> I'm making 21" of boost while another identical car (w/o Stromung
> is making 26" of boost. I've even borrowed the ECU from that car, but
> still can only make 21" with my car. Both cars have Autometer gauges:
> mine's digital with peak hold and his is analog.
>
> We haven't verified the gauges one to the other, but that's the last
> thing I know of to check (or use a 3rd known gauge on both cars).
>
> Anything obvious that we may have overlooked? We've pressure tested the
> system, but no leaks shown. It pulls hard to redline - I can LFB all I
> want with the accelerator on the floor, but still only see 21".
>
> Thanks!
>
> Steve Powers
>
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