What do you guys and gals class as 'overheating'. my Zed under normal road conditions stays below 90 deg C but on the track it does rise to 95 ish, which scares the life out of me especially having a cast iron block and alloy heads which by nature expand at different rates. What does your car run at under 'stress' conditions (giving it welly):yes: and is it modified.

Edited May 21, 201015 yr by Old Zed
additional info.

Normal 78-82 and giving it welly is 82-85ish and yep modified mate :yes:

smithy

not sure on mine but on the stock guage it always stays just under the half way mark

Mine sites at 75 - 80 oc most of the time.

not sure on mine but on the stock guage it always stays just under the half way mark

 

It wont. Its a non-linear gauge and wont move from that position till temp is over 100c. Utterly useless.

not sure on mine but on the stock guage it always stays just under the half way mark

 

I've found the stock gauge will just sit at half way once up to temp, its not like a real time gauge, if it starts to head north then your over heating as i've found out in the past.

when i hit track i think the highest water temp i hit was around 90 so plenty of lee way from its boiling point :) Oil temp now thats a different story!!!

 

On track i lasted about 10mins before my oil was sitting at 115 so i had to pull in mighty quick!!!

If im wellying mines sits a little above half way. The engine often smells very hot though so I'm going to check my oil/water level tomorrow etc.

If the cooling system is in good condition and still under pressure, temps just over 100 deg Celcius are OK. Would go much higher though.

Interesting thread, I too have stock gauges both oil and water temp. Oil fluctuates enormously, but water just sits there as you say.

 

Is it a major job to add in some gauges, I mean at the business end, where the sensors pick up their information to send to the gauge?

 

God, I find being a member here is so good. Thanks to everyone who imparts their knowledge for us lesser mechanical mortals.

 

It wont. Its a non-linear gauge and wont move from that position till temp is over 100c. Utterly useless.

Aftermarket gauge sat at 80, it would rise to 85 stuck in traffic and then go back to 80 when moving along again.

It wont. Its a non-linear gauge and wont move from that position till temp is over 100c. Utterly useless.

 

Is it the gauge or sender unit that is non-linear?

Reason i ask.... If it is the sender unit, can it be replaced for a more accurate reading?

 

Al.

Interesting thread, I too have stock gauges both oil and water temp. Oil fluctuates enormously, but water just sits there as you say.

 

Is it a major job to add in some gauges, I mean at the business end, where the sensors pick up their information to send to the gauge?

 

God, I find being a member here is so good. Thanks to everyone who imparts their knowledge for us lesser mechanical mortals.

 

Oil guage is pressure though not temperature. :oops:

pretty sure the sender changes voltage according to temp, so would assume it`s the guage that`s poor..unless the senders range is limited of course.

Yes. its to do with the Gauge itself. The sender is a fairly typical NTC Thermister

Yes. its to do with the Gauge itself. The sender is a fairly typical NTC Thermister

 

any idea what makes the gauge so unreliable?

It's not that its unrealiable, just useless. A middle needle position indicates something like 60 to 110 degrees. By the time it starts moving up, you're pretty well stuffed

http://i708.photobucket.com/albums/ww89/nzniggles/Tempgauge.gif

There you go, found it

its about time that a modification is done to rectify this...

Shite design.

I've got a Tech-Tom fitted to my motor. It shows road speed, water temp, air flow and something else I forget now. It just plugs into the existing system but gives a digital display as apposed to an anologue.

 

When it was properly hot at the weekend the temp got upto about 87-90 in slow moving traffic, but dropped to 80-85 when moving above 40mph. at motorway speeds it was reading 77-83.

 

What I hadn't really considered was the use of the turbo timer. In my niavity I left the timer on, only to return to my car a short while later to find the engine temp was well over 90 even tho the engine had stopped running. The heat sink must be a killer from the manifolds and turbos. Needless to say, I cool the engine to about 80 with careful driving and switch it straight off once stopped. Worth a mention I thought.

 

Cheers

with the added addictives the boiling point should raise, so on track about 100 or so will be ok, when the water boils thats when it looses its colling properties. So the higher you can make the boiling point the better.

with the added addictives the boiling point should raise, so on track about 100 or so will be ok, when the water boils thats when it looses its colling properties. So the higher you can make the boiling point the better.

 

Its also to do with the system pressure over atmospheric pressure that raises the boiling point.

 

If I remember correctly the stock rad uses a 1.2bar cap?, which will raise the boiling point of water to around 123c (the actual figure changes as atmospheric pressure is not a constant and changes.

daily)

 

Antifreeze can then raise the boiing point a further 5-10c above that as well.

 

But still , anything in the 90's scares me and I would be pulling over if I saw 100c and crossing my fingers. VG's dont like getting hot.

Edited May 26, 201015 yr by Yowser

Its also to do with the system pressure over atmospheric pressure that raises the boiling point.

 

If I remember correctly the stock rad uses a 1.2bar cap?, which will raise the boiling point of water to around 123c (the actual figure changes as atmospheric pressure is not a constant and changes.

daily)

 

Antifreeze can then raise the boiing point a further 5-10c above that as well.

 

But still , anything in the 90's scares me and I would be pulling over if I saw 100c and crossing my fingers. VG's dont like getting hot.

 

Hmmm i was reading somewhere that its normal in some race cars to get that hot. I dont think mine gets that hot now that ive installed a bigger rad but it used to run hot and its been fine.