[Diy_efi] Pressure readings perpendicular to airflow

[Grant Beaty]

Your running a boost signal straigh to the WG? If so, installing a decent
boost controller of any sort should improve spool significantly.

BTW, getting the signal after the throttle body can cause overboost on pa=
rt
throttle and possibly massive surge.

Grant

----- Original Message -----
From: "Barry" <sy2th at direcway.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Tuesday, June 03, 2003 12:01 PM
Subject: Re: [Diy_efi] Pressure readings perpendicular to airflow


As an aside on this discussion, did some recent experiments, hooking up t=
he
signal line to the wastegate actuator to a couple of different
points.  Normally, its connected to a small barb on the compressor scroll
housing (TE60) which tends to be a bit teeny.   Installing a 5/16" I.D.
barb in the section of pipe between the turbo outlet & intercooler gave
better response, mainly because the teeny barb in the compressor presente=
d
a restriction to the airflow in/out of the WG actuator - you also want a
large ID fitting into the actuator.  Response was better w/ a larger barb
elsewhere.  Also, cutting the end of the 5/16" tube at a 45=B0 angle & fa=
cing
it into the airflow gave lessened spikes on sudden pressure increases
(shifts & TC lockup), but also a slower return to desired boost after a
spike.  Airflow *from* the WG back into pipe the was impeded by having to
overcome static as well as dynamic pressure.  Wound up w/ the 5/16" tube
flush w/ the wall of the turbo/IC pipe, gave best overall results.

YMMV, FWIW, 2=A2, etc -

Barry


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