I am gonna buy the Z centre oil cooler upgrade for me Jap TT Auto. I will need it fitted however, I dont even wanna attempt it meself. Any Ideas Guys? I am located in Gloucester. Also after a chip, probably JWT or similar, where do i get one and get it fitted?

 

Help Much appreciated.

The engine and autbox oil cooler are equally important, without an adequate oil cooler the engine oil temp becomes excessive!

 

19 row is the size of the one you want for the engine!

TBH - I'd leave the engine oil cooler as it is - its not used much anyway.....just concentrate on the autobox cooler.

 

What I did with mine was to make a U shaped bracket with the parts I was sent and bolted it where the engine oil cooler is bolted to the car - then the new cooler sat on top of the long part of the bracket with a cushioning rubber strip to protect it (old bicycle inner tube strip!) You could easily pop to B&Q to get some aluminium pieces to make your own bracket as the brackets you get arnt the strongest, but they seem to do a good enough job.

 

How did you plug-up where the two pipes go on the rad?

Heh - I didnt....I bypassed the radiator completely as its prone to blocking up with debris and you dont want that - so I left it out of the equation.

 

If the engine oil cooler only works at high pressure, then its not going to be used much and so I would be surprised if the one fitted isnt good enough to last a few seconds of heat dissipation. It isnt used all the time like the autobox cooler is - thats a constant flow through - hence why I dont think its worth doing - I stand to be corrected of course - provided someone can prove it with temperature reading etc. But I've never noticed it even get warm. Now if you removed the pressure valve so it circulated freely, or fitted a temperature switch - THEN I would agree entirely, it would be worth doing. IMO of course!

If the engine oil cooler only works at high pressure, then its not going to be used much and so I would be surprised if the one fitted isnt good enough to last a few seconds of heat dissipation. It isnt used all the time like the autobox cooler is - thats a constant flow through - hence why I dont think its worth doing - I stand to be corrected of course - provided someone can prove it with temperature reading etc. But I've never noticed it even get warm. Now if you removed the pressure valve so it circulated freely, or fitted a temperature switch - THEN I would agree entirely, it would be worth doing. IMO of course!

 

You can't remove the pressure valve so that it circulates freely!

 

The oil cooler operates at about 3500ish rpm, depending on the strength of the spring!

 

There is a difference between jap and Uk oil coolers about 10 rows, it is the nismo item on the UK cars, the cars were designed to take the high speeds of the autobahns!

 

People with Jap oil coolers have very high oil temps, ask Lymon!

Has anyone got any temp figures on this or any stats as it'll be quite interesting to know.

Trust me you need a big cooler on your engine oil as well, if you don't believe me ask Lymon!

 

Or work it out, 3 and a half litres of oil, for a 3litre engine also cooling two turbos developing 300+bhp, trust me it is gonna get HOT!!!

I used to have the small type oilcooler on my car and on hot days engine oil temps would rise to around 110-125 degrees Celcius...especially in stop-go traffic temps would rise enormously.

Problem with the small cooler was also that once you reached temps of above 100 Celcius it was very hard to get the temp back to normal operating temps again. (85-90 degrees)

This is probably caused by the oilpressure operated check valve system that is used on our engines.

At 100+ temps the oil gets very thin and oil pressure is not enough to open the check valve so you don't have any flow through the cooler.

A good test is to go for a good blast on the motorway and once you're done, feel the oilcooler....you shouldn't be able to touch it, it should be almost as hot as the radiator.

For the small oilcoolers it is very common that it won't even feel warm, while oiltemp is actually at 100 Celcius.

 

I now have a proper cooler on the same car/engine and the highest I have seen is 95 degrees Celcius and the cooler now gets really hot as well, so it's actually working.

I also did the same test with 4 other cars (all had the small type engine oil coolers) and all had the same result.

So I can strongly recommend a big(ger) engine oilcooler...or upgrade to the Euro/UK spec cooler

 

-Eric

Lymon While you are here!!!!

 

I had a go at putting the thermostatic sandwich plate on my car to feed the oil cooler, and with the two connections in it, it doesn't it, it would fit with one connection in it though!

 

I was thinking the pressure feed could be taken out and used as an open feed to the cooler, with a thermostat in line, the return could be to the sandwich plate, with the feed hole in the sandwich plate blocked off!

Mark, I haven't tried using sandwich adapters yet.

Did you use a NA or TT filter bracket ?

 

I'm working on a system that uses a seperate electric pump, (with thermostat ) to flow oil taken from the oilpan through the cooler, so the engine oilpump is freed up from doing this.

 

-Eric

 

 

Lymon While you are here!!!!

 

I had a go at putting the thermostatic sandwich plate on my car to feed the oil cooler, and with the two connections in it, it doesn't it, it would fit with one connection in it though!

 

I was thinking the pressure feed could be taken out and used as an open feed to the cooler, with a thermostat in line, the return could be to the sandwich plate, with the feed hole in the sandwich plate blocked off!

I have noticed that my Uk oil cooler actually gets quite warm, surprised me as I never felt the old Jap one doing that, so I guess it's working!

All good info guys! Much appreciated and learned something new.