Engine temp test. - Page 2

GordyB · 19th March 2018, 18:06

Funnily enough I've just been comparing my two. The auto runs along at 86-88 and can hit 90 under load but mostly sits tight at 86. The manual (which caused me to check as it's not getting the mpg I expect) struggles to hit 80 even under load, mostly it fluctuates between 74 - 77 depending how I'm driving.

I'd love to have them both up at 90-94

Are there any figures showing how much approx 10 degrees too low will effect mpg?

T-Cut · 19th March 2018, 19:56

Quote:

Originally Posted by GordyB

I'd love to have them both up at 90-94

Does either car have the in-line stat mod?

TC

HarryM1BYT · 19th March 2018, 20:56

Quote:

Originally Posted by Phil th Barrow

Heater matrix must rob quite a few BTU's then..

It certainly does. The only fair way, would be the cabin heater set to off when checking the temperature rise of the coolant.

Mike Trident · 19th March 2018, 23:35

Yes, the heater does make a big difference. But think about it, it is in fact very much like a small radiator with a fan blowing cold air through it.

GordyB · 21st March 2018, 06:12

Quote:

Originally Posted by T-Cut

Does either car have the in-line stat mod?

TC

No both are running the correct stat only.

T-Cut · 21st March 2018, 09:25

Quote:

Originally Posted by GordyB

No both are running the correct stat only.

I guess you mean the original stat. You should be aware that the wax capsule in these changes over the years and the valve begins opening too early. This is very bad for achieving an optimal running temperature. See this for the lengthy details: https://the75andztclub.co.uk/forum/s...d.php?t=102943

This is why the cheap and easy in-line stat modification is so popular. Using a recommended brand (Gates, FirstLine or Wahler) of the Renault 5 in-hose thermostat, you'll get the running temperature into the 90C area.

TC

bl52krz · 21st March 2018, 19:43

Quote:

Originally Posted by Mike Trident

Yes, the heater does make a big difference. But think about it, it is in fact very much like a small radiator with a fan blowing cold air through it.

When the engine is warming up, you can put the heater onto ‘recycle’ which means it recycles the air from inside the car through the heater. This will only do that for a set time, so you have to keep an eye on the button light. When it goes off, you have to press it again to resume. Remember, if you use it to much in winter, you will probably have to use the aircon to get rid of the condensation.

BigBen · 22nd March 2018, 12:51

Quote:

Originally Posted by bl52krz

When the engine is warming up, you can put the heater onto ‘recycle’ which means it recycles the air from inside the car through the heater. This will only do that for a set time, so you have to keep an eye on the button light. When it goes off, you have to press it again to resume. Remember, if you use it to much in winter, you will probably have to use the aircon to get rid of the condensation.

Plus you will very much need to keep flatulence in abeyance....

Phil th Barrow · 23rd March 2018, 10:53

Quote:

Originally Posted by another_clean_sheet

Mine is the same. I have the Specialist Components unit fitted and have a 92 degree stat inside it.

Hi,

Iv just ordered one. Does it start to open at 92c or is that th fully open temp.??

Either way I think it'll help.

19th March 2018, 18:06	#11
GordyB Gets stuck in ZT, ZT-T Join Date: Aug 2015 Location: Brigg Posts: 932 Thanks: 505 Thanked 313 Times in 160 Posts	Funnily enough I've just been comparing my two. The auto runs along at 86-88 and can hit 90 under load but mostly sits tight at 86. The manual (which caused me to check as it's not getting the mpg I expect) struggles to hit 80 even under load, mostly it fluctuates between 74 - 77 depending how I'm driving. I'd love to have them both up at 90-94 Are there any figures showing how much approx 10 degrees too low will effect mpg? __________________ Gordon https://www.the75andztclub.co.uk/for...73f7538906.jpg 2001 Connie SE Raven Black, CDT - scrapped 2004 ZT-T+ XPG, 1.8T - sold 2002 ZT+ Biomorphic Supertallic #2 of 10, CDT - sold 2004 ZT-T+ Goodwood Aquamarine, CDT - sold 2004 BMW 320d

19th March 2018, 23:35	#14
Mike Trident Posted a thing or two Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016 Location: Oakenshaw, Near Bradford Posts: 1,622 Thanks: 385 Thanked 552 Times in 328 Posts	Yes, the heater does make a big difference. But think about it, it is in fact very much like a small radiator with a fan blowing cold air through it. __________________ Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s