To be honest, you don't hear of many ZD30 overheating issues if you maintain the system correctly, even when towing, I tow a lot and never had a problem. The only issue I have heard of is the top of the heat exchanger cracking at the hose connection point, but not to me yet.Is there a way to reduce under bonnet temps such as bonnet vents or do we just have to live with them. ZD30 if that makes a difference.
At what position was that 72C measured, left, right, rear etc? It can vary quite a bit around the entire bay.I have measured my underbonnet temps and the highest reading i have ever got on a 42 degree day whilst driving with a load has been 72 degrees.
On average it sits somewhere between 50 to 60 degrees.
Unless you have an overheating problem I would not worry.
If you really wanted to get serious get your exhaust manifold, turbo exhaust housing and exhaust dump pipe ceramic coated this should drop temps a bit, but it is expensive.
I've also been thinking about some kind of skirt under the bar, just trying to work out how to make it easily removable for off road use and easy to store and put back on when on the highway again.Another thing I'm also looking at is a rubber skirt under the front of the car to try and create a low pressure area that will aid airflow through the radiator and would also help if a bonnet scoop were fitted instead of louvers.
Agree to a point, but the testing is done in standard setup, original bumper etc and compromises are made so a vehicle will be appropriate for a wide variety of conditions, but not ideal for any of them, in Australia heat is generally an issue and I think it can be improved upon. I have monitored under bonnet temperatures and feel that anything over 60c is contributing to negative performance.do yourselves a favour and monitor a temp guage as you are moving compared to when you are stationary. When you stop and poke your head under the bonnet its stonkin hot! but when you are on the move there is a low pressure under the car sucking it out.
Fitting extra radiators and the like is un-neccessary and puts considerable extra load on your waterpump, just asking for problems IMHO. Most prodution vehicles are tested extensievely for under bonnet temps and they dont generaly have issues unless somthing is busted.
I'm just going off the articles and what I've heard and it makes sense that being made of plastic on the GU's it wouldn't be for protection, may serve as a splash guard as well.My tb42e has that metal guard at a angle while on gq mads diesel gq had it flat. I thought I was a water splash guard?
.....................by creating a smooth high velocity airstream under the vehicle it draws air out and creates a negative pressure under the bonnet which pulls more air through the radiator.
.......This was my understanding as well. Put simply the plastic guard acts as an air baffle that creates a pressure drop behind it, as it moves throught the air. Low pressure under the engine bay improves the ability of air to be drawn throught the radiator and scoop.
When i fitted TJMs radiator under guard this plastic baffle had to be removed . To compensate i extended the short turndown on the TJM underguard with a section of heavy rubber from Clark Rubber. This works a treat. It retains the original baffles function, but is way more durable and acts as a excelent stone guard for the steering damper.
Plus, during water crossings it harmlessly can back flex against the steering damper. But it still helps drop the water level behind it as it pushes through, keeping the water level lower in the engine bay.
Before some one says it I know this thread is worthless without pics. I'll see what i can do.