What sort of temperature differentials from ambient do you see, and if you have pics of your monitoring set-up, or engine bay/induction set-up, post 'em

Cheers

 

Temps really need to measured as near to throttle body as possible. Its a little pointless measuring at the air intake as that air is heated by the turbo and the cooled by the intercooler before it reaches the engine. Its at the inlet to engine temps are important and show how well the intercoolers working. I measure mine in the intercooler just prior to throttle body.(top mount)
At cruise i see 1 or 2 degrees above ambient. When giving some beans between 35 and 40.
Its in traffic you see where the top mount suffers and ive seen as high as mid 70's. Also its pretty amazing how quick they come down once you start to move. From Say 70 degrees to ambient within 100/200 yards

 

Sorry cant edit as mobile. I see 1 to 2 degrees below ambeint ay cruise not above as in my post

 

Monitoring ACT's can be set up fairly cheaply with thermocouple wires and digital thermometer. My system is fairly crude but effective. The digital themometer I purchased off e-bay for £59 and has T1& T2 + T1-T2 or visa-versa and refreshes 2.5 times per second. I run thermocouple wire probes, T1 placed under I/C throttlebody connecting pipe, throttlebody side, so the tip of the probe is in the centre of the air flow and likewise T2 at the turbo outlet.
I have an in wing CAI, AVO TMIC , Perrin Aquamist water/meth injection.
I've recently installed a 5 nozzle sprayboom which sprays water up into the incoming airflow in the bonnet scoop, again done on the cheap, 20litre water tank in boot £7, submersible waterpump £19, pipework, nozzles, clips etc approx £25, rocker switch £8, fuse adaptor £4.
I ran 4 very hard pulls up to 6000rpm @1.6bar MD321H turbo and constantly got +7 ambient (20 deg c/27c ACT) on the 4th run I switched to T2 at peak and the turbo outlet temps showed 214deg c need to do further runs to verify the figures.
Before the addition of the waterspray boom I'd normally see +11/12c ambient with this sort of activity
Trev

 

I have one of these
http://www.watercoolinguk.co.uk/p/LC...-Green_16.html
They are sold for measuring temps in PC`s, really good for the price. It refreshes every second. They even sell the convertor for in car use, only £1.02

 

Great feedback, thanks.

Here's a pic of the ECU (Simtek) temp unit at the end of delivery IC pipe. I was thinking of tapping into this. Do you think this is possible?



Trev - 27° sounds good. When my car was mapped the other day we saw 41° with ambients of ~27° and 51 at the induction cone

214° you're really cookin' !

 

My simtek temp sensor is tapped into the intercooler near the outlet pipe, which is where Bob Rawle said to put it. Would have thought any sensors need to be post I/C.
My water/meth helps ACT'S and of course EGT's which are usually 550/600c
I was pretty shocked by the high turbo temps, I don't normally watch them to much and would normally see 133c's when ambients were much lower,so need to find out whats going on there.
Trev

 

Soz, the temp unit is at the end of the IC delivery pipe, just before the throttle body (edited above post to clarify that)

 

So is ACT's of a few degrees below ambient a reasonable expectation for a top or front mount?

 

At cruise yes

 

In normal driving they would always be a minimum of a couple of degrees above for me, that is ambient as seen by the cars temp gauge which isn't important, obviously when they soar it is.
Trev

 

[QUOTE=trevsjwood;10175642]In normal driving they would always be a minimum of a couple of degrees above for me, that is ambient as seen by the cars temp gauge which isn't important, obviously when they soar it is.
Trev[/QUOTE

Really mine are under on on ambient. Ofcourse depends how accurate the guages are lol

 

Just fitted a front mount to mine with in car ACT gauge at throttle body it also reads roughly 2-3degs above ambient on a cruise, wondered if that was normal or just because cone filter is in engine bay supping warm air

 

How are you monitoring your ACT temp?

 

Im using the guage in the above link a few posts up

 

Just ordered

 

Did you order the 12v to 5 v wiring?

You could make one if you havent but there only a pound odd

 

I think it's normal,coolent flows around the throttlebody, unless you have bypassed it as some do and the sensor could pick up some heat from there. There isn't anything to bring the temp below ambient unless coldwater is applied.
Trev

 

Yep i do have coolant delete on the throttle body

 

sounds like a good cheap mod

 

the cheaper gauges are ok for keeping a general eye on things but to be accurate on picking up the peaks they need to refresh 2-3 times a second.
Trev

 

A mod ive been meaning to do!!!

 

Yes, I ordered both.

I'm thinking I can piggy back off the sender near the throttle body

 

Mine, on a 2.5 converted classic, was fitted after the engine was rebuilt, it was Harvey's idea, he has done loads of research into ACTs.

We think that heatsoak was what helped kill my previous engine with a TMIC, when I did daft sppeds on the A28 north of Rouen for about half an hour, then queued for a toll, then booted it away again and bang. It was running around 300bhp.

I now monitor tempertaures outside and inside the car, intake air temperature at the air-filter and ACT with the sender being tapped into the intercooler pipe just before the throttle body.

Here are some from a hot day in France:

Outside air temperature: 37 degrees.
(Inside air temperature): 45 degrees until I got moving.......
Air intake tempeature: 48 degrees
ACT: 54 degrees, but soon dropped when moving to 35 degrees.

This is typical of the setup, the ACT hovers a couple of degrees below ambient, but switching off and leaving the car for half an hour can see frightening underbonnet temperatures, a good reminder NOT to boot it too soon.

 

^ Couple of q's, just to be clear if that's OK

IC front or top mounted?

Was your intake temp of 48° when moving, while your ACT was 35?

Is your intake shielded at all, and have you a cold air feed?

 

now a Hybrid GT2 FMIC, fitted at Harveys during the rebuild.

To start with, yes, then it dropped, but only to around 40 degrees.

Nope, it's on my "to do" list, the bonnet seal has been altered at the o/s front to allow more cold air in. I will have a go at shielding it with alloy plate when I get back from France in September.

 

Admitadly I'm experiencing some crazy heatsoak too, taking only five mins to send the act's wellover 50 degrees, I'm monitoring this on my laptop in the cold side of the intercooler, I can't help thinking that this is the intercooler temp and not the actual air temp though! I am going to try and insulate my temp sensor with a plastic screw in shield and see if this makes a difference. My sensor is a brass bodied Bosch one similar to the above, so conduction of temp may be a problem causing the temp of the intercooler to be read and not the actual act, until they stabilize out after a short drive.

 

Worth mentioning that I belive the air temp to be substantially lower than the gauge says as the car runs very lean when this temp is indicated making me belive the actual air temp is much lower, as my car is running programmable management and uses manifold pressure and act as a density calculation for fueling, if it was that hot then the air would so thin that it would not show lean

 

I use a Lamco temp gauge with the sensor in the short pipe just before the throttle body.

Not the most accurate of gauges but in this weather if i'm sat in traffic it'll go up to around 45C. Cruising its around 25c. A few degrees lower than ambient. On the cooler mornings it barely goes past 20c

Thats with a standard tmi.

 

I'm seeing 50+ degrees and tg ambient is rarley above 15 in my area just now