After a long time of researching a lower temperature thermostat to replace stock 3 piece 190 degree AJ811788 thermostat with a perfect fitting 180 degree unit, now I got a perfect matching insert. If you got a 4.2 car, can offer a tune as well with an adition of lowering fan start temperatures by 10 degrees to match the new thermostat. Now this is not a requirement but if your pushing more power and or race the car the track , this would be a nice addition.
Price with shipping in the USA will be $70
If your interested in a tune we can discuss.


Should fit all models using the 3 peace AJ811788 thermostat

• Jaguar XF XFR 4.2 V8 & 4.2 V8 R
• Jaguar X150 XK & XKR 2006 on 3.5 & 4.2 V8 & 4.2 R
• Jaguar S Type 4.2 V8 20063 to 2009 from vin N52048
• Jaguar X350 XJR 4.2 V8 2006 to 2009 From vin G49701

 

I am interested

 

Pm for details

 

PM'd.

 

!

 

Hello all. I'm the guy in Texas with a 2004 Ford Thunderbird which is based on the early S-Type DEW98 chassis and engine.

Couple years ago I was able to purchase a 77degC (170degF) thermostat from Jaguar Racing in Coventry. Supposedly it is NOS as used in factory S-Type cars raced in British Touring Car Championship.

There is no part number stamped on the part, only the numbers "225" and "77C". Jaguar also sent an O-ring packaged in a plastic sleeve with Jaguar label indicating the O-ring is part number NCR2246BA "Made to Jaguar spec in UK".

Plan to attempt installation over the winter.

My car is dyno tuned with the factory standard 190degF thermostat, thus a re-tune will be required. Not a problem. (I use Ford specialist tuner HPP Racing dyno in Garland TX - https://hppracing.com/ )

Anyone care to comment on this installation?




Off-topic ETA: Pic from Lake Highlands Cars & Coffee yesterday. As day progressed a TVR S, Lotus Exige and Rolls-Royce Wraith joined the party.

 

problem is, my '06 STR uses the 2 piece tstat and not the regular type. so finding alternatives is damn near impossible

 

Does that thermostat have a replaceable active section?

The ones I'm familiar with on the Ford version of the AJ V8 are multi-piece with wax-filled thermostat section, two springs and a "mounting bracket".

 

See original post. AJ811788 miltipiece thermostat replacement in lower temperature, is available for purchase. I assume that's what's in you car.

Photo for reference

 

ya thats what I have! And you say theres a lower temp tstat offered? Where at? Im interested!!

 

Ya! thats the ticket! I dont know why why I didnt see the part number before. So i guess the next step is to see which one i already have.

What models used the AJ811788 tstat? and which one is stock for the '06 STR?

 

If it's multi-piece , it's the same as
AJ811788 thermostat.
$70. 180 degree unit

 

I should Add that the thermostat completely eliminates the rubber seal which is a main failure point of our factory thermostats. Available in stock or lower temperatures

 

Any recommendations for 3.0 ?

 

Have no experience with the 3.0 ,looks like a 1 piece design thermostat , I would go for one that does not use the rubber gasket as it will last longer than one with the gasket .