turbo timers

**vnx205** · 26th June 2008, 07:08 AM

Thanks for the offer.

Quite right about needing a passenger. So now we need a second volunteer. It's a pity I don't live closer.

The answer to some of your questions will be determined by the results you are getting and what you can conveniently do.

I suppose the worst case scenario would be to tow a heavy trailer flat out up a big hill to get the temperature about as high as it is ever going to get, but we have to be a bit realistic.

Something that was representative of what people normally do would be more useful.

What you described about the way you arrive home would be similar to what a lot of people do a lot of the time. So just follow your normal routine.

It might be useful to also have another common situation like pulling off the freeway into a servo.

But I don't think it is my job to tell you what to do.

After all you are the one who is taking the trouble to try to provide some real life figures to try to help people understand what is happening under their bonnet.

It's not possible to cover every single circumstance. I'm sure whatever you decide will be useful.

**Disco_owner** · 26th June 2008, 02:53 PM

Since i volunteered for this task, I really had to have an assistant
to help me take measurements as I deemed it to be unsafe looking at gauges every 15sec
intervals and taking measurements whilst driving.

so the Data I've provided is from a typical days drive to see a friend
up at Berrowra just up the F3 freeway , about a 15-20 minute drive from home.

0 time is the end of the Freeway where we actually start
to take these measurements,now at this point EGT had droped down
from 540ish to 434. because of the end of Freeway
traffic conditions

As You can see from the time I pulled into my driveway till the actuall
time where the engine was switched off is 3 minutes. personally I don't think
that was a long wait to be sitting Idle inside the vehicle for EGT to drop down
to this EGT point. I 'm also assuming Ambient Temp will play part on how quickly/slowly
EGT drops off down to 200 on a day that's let's say 35 deg c outside

**isuzurover** · 26th June 2008, 03:41 PM

Great work!!!!!!!!!!!!!!!

**vnx205** · 26th June 2008, 07:49 PM

Blimey!
Talk about efficient and thorough!

I need a bit more time to think about all that data, but it looks to me as if the temperature drops very quickly immediately the boost drops. In fact about 66 degrees in only the first 30 secs of idling along.

**vnx205** · 27th June 2008, 04:07 PM

After the impressive work by Disco_owner on this project, I thought I needed to make a small contribution.
Something that stands out, I think is how quickly temperatures drop when you back off.
I suppose though there would be a little bit more of a lag before the metal in the turbo dropped.
What is supposed to be an acceptable temperature to shut down?

**Disco_owner** · 27th June 2008, 04:29 PM

Thanks Alan,

Also another thing worth Noting is that once EGT reached 200 deg or thereabouts "which is usually my cut off point " the drop off rate of EGT is very Slow from this Point onwards , i think it took another 2 minutes or so for EGT to drop down from 200 DegC to 170 DegC with engine idling. I'm not quite sure how the 200 Deg Cut off came about ? I think this was a figure that was accepted by a few of us here on one of the Tubo-Timer threads??

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