[DeTomaso] Testing Results (Re: coolant Temp senders, engine block)

[Asa Jay Laughton]

I have a 1973 Pantera L, build date of 6/73.
According to Ford TSB 8, published August 31, 1973, the change from the 
230 gauge to the 260 gauge happened in production on 7/16/1973.  This 
probably explains why mine has the 230 gauge.  It was built a month 
prior to the change-over.

You can see an illustration of the two gauges here:
http://www.teampanteraracing.com/index.php?option=com_g2bridge&view=gallery&Itemid=57&g2_itemId=4871

I'm using the TS6628 temperature sending unit.  Today I did some testing.

When the gauge was just past 160, the IR gun was reading about 165 at 
the water neck inches from the thermostat.

Midway between 160 and the first mark before 230, the temp was 180 at 
the water neck.
When the gauge was just shy of the first mark, the temp was 190 at the 
water neck.  At about 200 at the water neck the fans kicked on.

I'm satisfied I don't need to add anything to my gauge to get fairly 
accurate temp readings.  There may already be a resistor in line 
somewhere, I don't know.  Your mileage may vary and I would encourage 
you to double check things as I have done.

An interesting observation while I was IR gunning the radiator and the 
hoses.   The hose would measure nearly 40 degrees hotter than the 
aluminum radiator between two points only a few inches apart.

I let the car idle in the driveway at temp while adjusting timing and 
carb (with the best tool ever, my vacuum gauge).  I never had boiling 
over.  I'm now letting the car sit and will check coolant level after 
the engine cools off some.

I will then add new AMSOIL Coolant Boost and re-check it all.  :)

Asa Jay

PS.  The TEFBA Filter has caught small debris for the second year.  I 
will continue to run the TEFBA filter as it appears to be doing a great 
job.  Photo of year two is here:
http://www.teampanteraracing.com/index.php?option=com_g2bridge&view=gallery&Itemid=57&g2_itemId=4874



Asa Jay Laughton, MSgt, USAFR, Retired
&  Shelley Marie
Spokane, WA
******************************
http://www.racingagainstautism.com
http://www.teampanteraracing.com
http://facebook.com/racingagainstautism


On 5/19/2012 12:17 PM, JDeRyke at aol.com wrote:
> In a message dated 5/18/12 4:12:34 PM, asajay at asajay.com writes:
>
>> There are also a couple of entries that list a 10 ohm 1/2 watt resistor
>> in line with the stock gauge makes the Ford temp sender read properly. 
>> Based on that knowledge, my guess is...
>>
>> - if you use the Napa TS6153 (Mustang part), then you'll need the extra
>> resistor.
>> - if you use the Napa TS6628, the resistance is already built-in
>>
> ... and based on my experiences, a later 0-260F gauge with a Ts-6628 sender
> needs less or no resistor compared to an early 0-220F gauge.
> Bottom line: you'll still need to calibrate YOUR car to YOUR gauge no
> matter what combination of parts you use. Some combos just will not work
> accurately. Good luck all- J Deryke
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