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RE: EGT Turbo Gauges,
> The sad point in EGT setup for our beloved cars is that the data that we
> get is only academic. We can't easely readjust our fule and ignition
> systemst to compensate for lean mixture. Yes some of us modify and
> upgrade fule destributors and wormup regulators but we still don't get
> accurate performance. I once saw 10V Turbo using MB 8 cylinder fule
> destributor. It ran rich at idle. There is no win with CIS. Installing it
> and learning to interprite info is good experence.
I run an additional FI controller and a sixth injector. The system operates
only when the boost is up and the CIS is running open-loop via the OEM
WFO throttle switch. This system is very good at adding the additional
fuel required for increased boost and is effective at keeping both EGT
and detonation mostly under control. Fuel enrichment is proportional to
both boost level and RPM. The injector is mounted in a piece of 2 1/2"
steel tubing between the IC and TB. The range of tunability is easily
changed by swapping in a larger/smaller injector.
This type of system might or
might not work as well with the more sophisticated EFI/ignition systems
of more modern engines, but works great with the primitive USA-spec.
ur-q systems. I've seen similar systems used on other ur-qs with equal
This system is the Callaway/Miller-Woods MicroFueler and
is presently used with a 268cc/min peak&hold Bosch injector, good for an
additional ~50HP potential. This system has absolutely no effect on idle or
on all non-boost operation and this is a real plus for drivability and reliability
and is highly tunable. I use the VDO EGT, Halmeter AF-30 mixture gauge and
MSD knock sensor display system for tuning purposes. The MicroFueler
system is no longer available commercially, but, I believe New Dimensions
in CA has a newer and likely better system available. ND: 408-980-1693