NOT ANOTHER EGT QUESTION!

[Rising]

I have no turbine... So I think I should be able to hit closer to 1100 ish.

Once the turbo goes on I'll be tapping the exhaust manifold for a proper Egt reading!

But thanks for the info anyway! Good to know!

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[745 turbogreasel]

NA an EGT will still be just as useful as  a fuel economy aid, like a vac/boost gauge in a gasser with or without a turbo

My water temp gauge is right in the water neck right off the head and does react very quickly to WOT

It's probably responding to your bypass thermostat opening more than anything else.

Looks to me like 8V and Theman are agreeing, but  neglecting  to mention  while the max fuel  capabilities are the same, the base max fuel setting of a turbo pump is for  aobut 20 HP worth of extra fuel, with the lda limiting  it to NA level while off boost.  Put a turbo pump on an NA, it wont smoke much, but if you puff 20 PSI into the LDA, it will smoke all the time.

[damac]

I use auber gages setup in my 79 rabbit with t3 turbo, slightly larger open exhaust, 82 truck with k24 and stock exhaust.

All using stock vw parts and fuel/boost.

I put gages when engine was out and rebuilt for the heck of it, never ran one before.

I see the coolant temps go up where the fan needs to bring temps back down worst case in hot idle traffic.  Not terrible temps but approaching 200 with auber gage at head outlet to radiator.  Stock thermostat/fan sensors.

Most of the time my cars run real stable water temps, but the other time I have seen the temps climb is when my egts are at their worst.  fifth gear, hanging on for life going up a hill with pedal floored because I'm trying to stay speed limit at 70-75mph.  Car just sits there and can't rev out of it, and egts have hit 1350 for maybe a couple minutes.

This is just me driving the car, just like I would my first vw diesel years back, a 85 stock turbo diesel jetta.

That car nor my current setups smoke beyond little puffs when starting cold,or maybe a nasty gear change.  I don't get a noticeable haze when following one of these cars either on or off boost?

Not even screaming the heck out the car in fourth gear at 70mph when trying to pass, and in these situations with max boost the car actually runs less than peak egts


I don't drive the truck but I find it interesting that my impression is it heats up more often?  Not overheats, etc. so no clue if thats a combo of extra weight, stock exhaust/muffler, different engine, etc.

So I was freaked out about the 1200 egt mark after I got this rabbit on the road, but soon after I got sick of looking at gages and set the auber alarm a bit higher and tend to just ease off a bit if I hear it triggered and drive the car. 

Maybe my rabbit is the perfect candidate engine to be modded?  Its the peppiest engine I have ever had and I am not sure why. 

[Rising]

Well I installed the westach. And it never moved off 700... I saw the guy test it in the shop yesterday with a torch... But now that I installed it nothing at all. Moved the wires around... Upped fuel a bit. Still never could get it off 700. I think I've screwed something up. I do wish this westach read lower so I could know if it was reading at all... Blah. I'm angry. Not sure where to start diagnosing my sweet find. Wish Id have bought the one I want full price now...

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[Gizmoman]

Pull it out and hit it with a propane torch. You may have to ground the housing but this should tell you if it's wired right.

[homerj1]

Well I installed the westach. And it never moved off 700... I saw the guy test it in the shop yesterday with a torch... But now that I installed it nothing at all. Moved the wires around... Upped fuel a bit. Still never could get it off 700. I think I've screwed something up. I do wish this westach read lower so I could know if it was reading at all... Blah. I'm angry. Not sure where to start diagnosing my sweet find. Wish Id have bought the one I want full price now...

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Maybe you should test the probe and then the gauge.  The egt probe will create volts when heated.

 I had an issue with my egt gauge, and I found it was the ground. ( it was reading way too low, after working great for 2 weeks)



this may help:  http://www.turbodieselregister.com/EGT_EVAL.pdf

[Rising]

Awesome article. Yeah I'll be testing this. Interestingly enough there is no ground or power connected to this gauge at all. Just two wires from the thermocouole. I watched the use the thing in the shop with a propane torch before I went to install.

Hit it with the torch and the gauge snapped up to 1400..1600...1700 and then he killed it. But aftee install I can't get it to come off of 700 no matter how much black cloud I pit out.

Could my placement at the bottom of the downpipe be the problem? Could exhaust really cool that much that fast ?

I'll pull it out and test it again and then hook up a voltomer. I'll report back when I do.

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[92EcoDiesel Jetta]

How far is your probe from the head? I bet the exhaust cooled considerably by the time it reaches the probe. Heat probe with propane, I bet it will register

[Rising]

Okay I'll give it a shot next time I'm at work with a torch. If so I guess my placement is too low.. I didn't think exhaust would drop that fast. My egt probe is right at the exhaust  turn heading into the tunnel.

 I couldn't get it up higher without removing the heat shield and I figured that was probably important.

I guess I could go ahead and tap this manifold too and buy a sxrew in probe. Its just going to be  a pain with the manifold in the car...


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[Gizmoman]

I guess I could go ahead and tap this manifold too and buy a sxrew in probe. Its just going to be  a pain with the manifold in the car...
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I've read that some grease on the tap will grab most of the chips - makes sense.

Harbor freight sells a heat gun for cheap. You could try shooting the area where your probe is located now to verify temps. I know it's not possible to do while your under load but you'd have a clue at least.
With no turbo though, it may be hard to hit 700 at that distance - not sure.

[92EcoDiesel Jetta]

You don't need to buy a heat gun. Just take the probe off and use a match, Which will get up to around 900 F.

[Gizmoman]

You don't need to buy a heat gun. Just take the probe off and use a match, Which will get up to around 900 F.

Your right, he doesn't need to buy a heat gun. Just my weird logic as he isn't sure he's hitting 700 (at the probe location) because the gauge never moves /
If the probe can measure a match, then he's not.

[bajacalal]

I don't think a heat gun would even get up that high to register on his 700F gauge. A torch will though, even a butane lighter might do.

[745 turbogreasel]

No reason to worry bout chips, especially NA.
You actually can just drill the manifold, and clamp the probe on, lots of airplanes this way.
Last one I did on the car, I shoved  my air hose up the tailpipe, and blew all the chips out as I drilled and tapped.
put the probe in a toaster /oven set to 500, those usually are not more than 30 degrees out of cal.

[Rising]

Okay brilliant I'll use a match to verify that it would come off of 700. And then start looking into to drilling the manifold. Do npt fittings require a special tap or just 1/4" ? And I'm guessing the best method is to take off the intake manifold and drill down into the top? Probably can't use my clamp on probe there though...

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