Thread: Ultra gauge temperature reading

I set the CHT alarms on my Puma to a low off -20C and a high of 100C. On the Puma the EMS overheating strategy comes in at 105C so by setting the alarm at 100C it gives me the opportunity to come of the gas and allow the head to cool before it gets anywhere near 105C.



I stay in Scotland which is a bit cooler than Australia and my CHT temps run about 88 -92C in the summer time depending on hills etc. In the winter time these CHT temps drop down to 86-88C even when towing a 2 ton load up hills etc, but this is due in part to having a few mods in the engine bay, Large intercooler, Decat pipe, Stainless exhaust with cherry bomb silencer, Hard intercooler pipes (Stainless Steel ) and a remap all from Alive Tuning.

The front cooler on a Puma with AC is the AC radiator.

Brian.

You're running a little cooler than us, our 90 sits around 92-93 just tootling around and hits 96-97 at 110kph on the freeway or under load at lower speeds. Has me a little worried given it is the middle of winter! Unfortunately didn't have the Ultra Gauge in the hotter months when we first got the 90.

Someone more knowledgeable might be able help but would you expect the CHT to be a lot higher with higher ambient temps or does it just reach running temp quicker and the cooling system has to work harder?

yeah I think most I've gotten so far is 98. Thats on a long uphill road. if it starts to rise I just slow down and down shift. higher RPM in lower gear seems to keep the temps down better.

It does usually get to 92-94 on normal roads but I try and keep it around 89-91. I'll set the alarm to -20 and 100 from now so I know!

I should probably get the AC rad checked next time I get in for service. The way it looks is I would have had to smash the grill to get to where its damaged.

My Puma 2.2 130 runs at 94-95 according to the Ultragauge.
The gauge on the dash is mid scale indicating normal. The UG derives the value from the vehicle sensor so the accuracy will depend on the quality of the sensor used. According to WS manual, the thermostat starts to open at 82 and is fully open at 96 If the UG value is correct it doesn't give much scope for working hard on a hot day with AC on etc

Ive also plugged the UG to the wife's RRS and it appears to runs about 8 deg cooler at 87-88 in the same conditions.

Follow the fuel calibration procedure to get your fuel alarms more realistic.
The Puma 2.2 fuel cal factor was 0.37 from memory. (away at present)

The CHT sensor on the Puma engine measures the cylinder head temp and not the coolant temp. The UG uses the CHT sensor for coolant temp as the Puma engine doesn't have a coolant temp sensor. You could always fit an after market coolant temp sensor to get a better idea of actual coolant temp.

I have the EGR closed by remap which raises the CHT by 3C. The EGR gases entering the burn actually cool the burn down. I did a little test using my MSV with the OEM fuel file, OEM fuel file with EGR closed and with the stage 1 remap with EGR closed. The CHT temp was 3 degrees C higher with the EGR closed on both the remap file and the OEM file. Once I had the larger intercooler fitted the CHT dropped by 3-5 C on all the fuel files. Summer time driving, 18 - 25 degrees C the CHT readings are 89-91c at 70mph on the motorway on my way to work. The same journey in the winter time, as low as -20 C the CHT is between 84 - 88 C. The temp gauge is in the middle and the heater is blowing hot air. The difference is that in the winter time the induction air temp is low and the air is dense giving a cooler burn where as the summer time air is as much as 40C warmer and less dense and the intercooler and radiator have to work harder than in the colder winter time.

I recently emailed Allisport and they will soon have a stock again of their uprated radiator which I will be fitting into my Puma along with the waterless coolant. Once I have this system fitted I will do a live data session on my MSV and IDS system to see if the addition of all the mods help reduce the CHT when towing. I will post up the results in this post.

The addition of the larger intercooler was the first mod that I fitted that actually reduced the CHT. The removal of the decat and the fitting of a larger diameter straight through exhaust allowed the engine to not have to work as hard which reduced the CHT further. Though all the mods fitted needed a remap file to get them all working together, an Alive stage 2 remap.

HTH Brian

Originally Posted by Grappler

My Puma 2.2 130 runs at 94-95 according to the Ultragauge.
The gauge on the dash is mid scale indicating normal. The UG derives the value from the vehicle sensor so the accuracy will depend on the quality of the sensor used. According to WS manual, the thermostat starts to open at 82 and is fully open at 96 If the UG value is correct it doesn't give much scope for working hard on a hot day with AC on etc

Ive also plugged the UG to the wife's RRS and it appears to runs about 8 deg cooler at 87-88 in the same conditions.

Follow the fuel calibration procedure to get your fuel alarms more realistic.
The Puma 2.2 fuel cal factor was 0.37 from memory. (away at present)

I don't mean to hijack the thread but where do I find the fuel calibration procedure? Is it on the website?

I've got my alarm set at 96 which I have only hit once. Changing 6th gear seems to drop the temperature when it is working hard in 5th.

User manual downloadable from
UltraGauge Start

Kerry
Hamilton

Originally Posted by wally

I don't mean to hijack the thread but where do I find the fuel calibration procedure? Is it on the website?

Its in the Ultragauge manual.
See previous post for link to download the manual