[T3] Warmest head day?
topnotch at nycap.rr.com
Wed May 4 17:24:25 PDT 2022
Driving 50 or so on secondary roads.
Im measuring it just above the #1 plug on the head with a thermocouple The
head sensor on the T4 is just above
Now im trying to get the AAR to close faster, Ive got enough air for an OK
cold idle speed on startup but it needs to close down much faster than it
I did change its feed source to the alternator lead to give me an extra volt
or so, and that does make a difference but I need a relay to switch it so
its only on with the ignition on.
Subject: Re: [T3] Warmest head day?
What kind of driving are you doing for those miles, highway?
I wonder how the D-jet head temp sensor warming affects this. If the heads
start out really cold, the FI might keep the mixture richer for longer,
slowing down engine warmup, since the temp sensor may warm up a bit more
slowly than the hottest parts of the head.
Which raises the question of where are you measuring the temperature?
On 3 May 2022 at 20:50, Keith Park wrote:
> After driving around in various temps this year it appears that the
> hottest head day is when the outside temp is about 50F. Below that
> the thermostat takes longer to open but they don't get as hot, above
> that and the thermostat opens before they get that hot.
> At 50, the temps wander up to about 345 in 4 miles, sit there for a
> mile or 2, then back off to 325 as the thermostat starts to open but
> its about 7 miles before it really opens and temps come down to the
> 270's quickly as airflow gets going.
> This is with a T4 motor, so your results may vary, but Ill bet they
> are similar on the T3 as it's the same idea anyway.
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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