On Thursday, June 26, 2003, at 01:33 PM, mark krawczuk wrote:
hi, if there is different temp readings, has the halteh got its OWN temp
sender ? i know of a situation where a guy had 2 different temp gauges
connected up to the same sender , and was reading incorrect.
mark k
----- Original Message ----- From: "Mark" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, June 26, 2003 10:46 AM Subject: Re: ECU sensor accuracy
Yes, the only comparison map I have is the base maps provided as default in the software - described by Haltech as sufficient to start the car but not for driving - in their base coolant map, enrichment progressively decreases to 0% by 85 degrees C - which sounds right as I've heard an FJ thermostat opens at 82 C (and this is what is happening currently as Haltech 55 = ~85 actual temp.
I started the car last night and the Haltech sensor reads about 13 C at
start up with the car cold and sitting in the garage. I'll plug in the
computer check the reading without starting the motor today to see what
I get.
On Thursday, June 26, 2003, at 10:34 AM, Zac Campbell wrote:
Mark there probably would be fuel enrichment at 55 but not at 80-84C
(on the
Haltech temp reading).
Have you checked what scale your Haltech is operating on? Try checking
the
temperature in the morning before you start the engine, it must be
-10C or
thereabouts, while your normal 'real' operating temperature of 80-84
shows
up on the Haltech as around 55C (still a 65C increase in temperature).
----- Original Message ----- From: "Mark" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, June 25, 2003 8:12 PM Subject: Re: ECU sensor accuracy
Robert,
Yes, now I understand - it appears the ECU has been calibrated for this temp sender unit, so i won't play around anymore and leave as is.
The coolant fuel map it starts at -40 C and goes thru to +127C and a
little confusing to approximate where 55 C would be. Now this all gets
a little tedious - the span is 167 units (-40 to 127) divide by 32
intervals is ~5.22 degrees increase at each interval. So count along
to
18 intervals should be about where 55C is. I worked it out thus :
(-40
+ (18 x 5.22) = ~54) and at that part on the graph there is no
enrichment so looks like the calibration has indeed been done with
this
temp sender. Would there normally be any enrichment at 55C coolant
temp?
This is all fun...my wife's friend saw me tramping down to the garage
with a cable and laptop and asked what on earth I was doing...I said
"do you know the '2Fast2Furious' movie? well I'm programming the car's
injectors and getting data onto the computer as I drive"
She couldn't believe all this shit was going on with "some old Datsun"
in the garage and had to look on with amazement...;-)
On Wednesday, June 25, 2003, at 06:05 PM, Mark wrote:
I only have a manual for the Haltech e6k computer it contains a table
of temp to resistor value. I'll ask Haltech about a manual for mine
or
whether the sensor specs are the same as the e6k. I don't fully
understand what you're saying about wrongly calibrated - the engine
data page displays max. 55 C as does my datalog. When I examined the
enrichment map their is a ranges from -40 to 127 with 32 intervals.
There is just under 30% enrichment on the bar at around 55 C - this
from a map already in the car when I bought it and done by a Sydney
tuner.
Mark.
On Wednesday, June 25, 2003, at 02:42 PM, Robert Charles Scealy wrote:
Could be that the ECU is calibrated for the wrong sensor as well, if
that was the case then your sensor might be fine, and replacing it
might
have no effect at all. Is there any way with that ECU that you can
tell
what temp sensor it is calibrated for?
On Wed, 25 Jun 2003, Mark wrote:
Hmm, I just hooked up my laptop to my Haltech F9 and find the
coolant
sensor around the 55 degrees C mark. Car was idling for a few
minutes
and I went on two short test drives total running about 12-15 mins.
My
temp gauges reads around 80-84 C and the top radiator hose is quite
warm, but not enough to burn etc. I suspect my ecu sensor is dicky
Looking at the coolant enrichment Haltech map the car is set-up to
run
around 30% enrich at those coolant temps, so she's running too much
fuel. I fear the last Dyno tune was done like this, so if I replace
the
temp sensor whole new tune needed?! The current air/fuel ratios are
not
way on the dyno e.g. they range from 13.1 up to 10.0 so maybe the
last
tuner took account of the dicky sensor or maybe it happened since
(car
doesn't run any different so I think it's always been like this
since
I've owned it)
Mark.JT FJ20ET
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