Thread: Where to mount EGT probe ??

Originally Posted by clean32

just spent the last hour looking at that site.

300HP isuzu county ?? any one ?

Those Holset turbos are monsters.
I have had my own plans for quite some time, but life keeps getting in the way.

a 6 second metro?? maybe,

would love to see that thing, tryed googleing but no luck

Originally Posted by clean32

just spent the last hour looking at that site.

300HP isuzu county ?? any one ?

Spent quite a bit of time there too.

It sure would be interesting to see just what you could get out of a 4BD1T with an 'all out' performance build.........with an unlimited budget .........and then onto the gearbox etc etc so they could handle the touque.

Maybe all us Isuzu nuts could make a combined donation to Dougal, then his engine becomes the guinea pig for how far you can push them before they BLOW ........then at least we'll know the limit

Originally Posted by rijidij

Spent quite a bit of time there too.

It sure would be interesting to see just what you could get out of a 4BD1T with an 'all out' performance build.........with an unlimited budget .........and then onto the gearbox etc etc so they could handle the touque.

Maybe all us Isuzu nuts could make a combined donation to Dougal, then his engine becomes the guinea pig for how far you can push them before they BLOW ........then at least we'll know the limit

My engine is already the gineau pig. Haven't managed to blow it up recently.

My biggest shortage right now is time, there aren't any big costs involved in what I've got planned.
I've got an air/water intercooler (and pump) which needs installed (just pipework and mounts).
I need to make another probe mounting boss for my exhaust downpipe so I can measure post turbo EGT's and pressures.
I need a bigger exhaust.
I need to fix my transferbox input seal leaks.
I need to finish my CNC mill so I can do the internal machining on my variablevane turbo and fit that.
I need to pressuretest the neck I made to mount the VNT turbo off the new style exhaust manifold.
I need to shift my dipstick tube so I can fit that later style exhaust manifold.

But first I need to find the leak which is letting air into my fuel lines. It starts running like a 3 legged dog after 2 minutes on the loud pedal. Started doing it christmas eve. I've changed the spin on oil filter, just cleaned out the trap in the old EFI fuel pump which is still in there.
Both helped, but it's still there.

Makes it really embarrassing to blow past cars at the start of a hill in 5th gear, then have them pass your coughing and farting vehicle which is now struggling to crest the hill in 3rd.

Hi All,

This link may give you some of the pros and cons of installing EGT sensors before and after the turbo: ThermoGuard Instruments.

The Tech Info page on that site may be of interest too, if you're interested in the hows and whys of intercoolers, etc.

Brian's correct that most heavy trucks place the thermocouple downstream but I believe that's more due to historical reasons (i.e. old type exposed junction thermocouples can and did degrade and fall apart but this doesn;t apply to modern MIMS sheathed T/Cs). Also, the truck engine makers can easily test and correlate the downstream EGT to a particular upstream EGT limit for each particluar engine configuration.

Ian

Originally Posted by Leo109

Hi All,

This link may give you some of the pros and cons of installing EGT sensors before and after the turbo: ThermoGuard Instruments.

The Tech Info page on that site may be of interest too, if you're interested in the hows and whys of intercoolers, etc.

Brian's correct that most heavy trucks place the thermocouple downstream but I believe that's more due to historical reasons (i.e. old type exposed junction thermocouples can and did degrade and fall apart but this doesn;t apply to modern MIMS sheathed T/Cs). Also, the truck engine makers can easily test and correlate the downstream EGT to a particular upstream EGT limit for each particluar engine configuration.

Ian

The installation in heavy trucks is as a driving aid, not an aid to tuning a modified engine. With diesels this tuning is more appropriately done by a competent diesel technician rather than a home modifier fiddling with fuel volume. Few truck drivers, unfortunately, have more than a limited knowledge of what the pyrometer is for or how to use it. I always thought that the Standard Irish Educational Aid (pick handle) would be useful for instructing my drivers how to use the pyrometer. The idea is to back off the throttle and reduce EGT whilst maintaining performance and saving fuel. High EGT post-turbo means there is still energy (burning fuel and expanding gases) being passed through the turbo and wasted.