EGT gauge question.. Dumb question, don't hate

[tdotdub]

So I bought an egt gauge and an egt probe, for my 1987 audi 5000 turbo diesel quattro. And I got around to increasing the boost already, along with a performance pump (Giles) and what not. But I started driving it now, and still not intercoolered yet.. I am boosting at 22 psi. Now I want to intercooler it very soon. But I want to install this gauge even sooner.

Question 1) Where do I install the probe.. In the exhaust manifold before the hot side of the turbo? Or in the downpipe after the turbo?

Question 2) What is excepted egt levels.. and what is tooo high?

[745 turbogreasel]

In the exhaust manifold before the hot side of the turbo?

There

My car ran 1250 F on a long climb with stock fueling, and at 200,000 mi showed minor EGT damage to the pistons(and probably has no trace of temper left on the rings).
With an MBC, I run 600-1000 on the freeway depending on speed, slope, and wind.

[pointynoggin]

What is a MBC?

I run same as greasel,  i turned my giles pump down as egt was hitting 1400 if i tried,  now  am used to hitting 1200 on a long and hard acceleration but stay somewhere around 1000 going up hill.

I don't know if that is too hot.  Giles implied that 1200 is maximum continuous but who knows.

[bbob203]

So I bought an egt gauge and an egt probe, for my 1987 audi 5000 turbo diesel quattro. And I got around to increasing the boost already, along with a performance pump (Giles) and what not. But I started driving it now, and still not intercoolered yet.. I am boosting at 22 psi. Now I want to intercooler it very soon. But I want to install this gauge even sooner.

Question 1) Where do I install the probe.. In the exhaust manifold before the hot side of the turbo? Or in the downpipe after the turbo?

Question 2) What is excepted egt levels.. and what is tooo high?

what probe and gauge did you get?

[745 turbogreasel]

MBC = ball and spring boost controller AKA G valve.
Spools a lot faster, but also runs higher boost when I don't need it, so maybe hurts economy.

[pointynoggin]

oh, manual boost controller.

I have one but never installed it.  I have a T3 and I think I will tune down max fuel to limit boost.  That should drop my max EGT as well.

[tdotdub]

Well I bought the vdo gauge and probe kit (does it make a difference?) And since you guys are saying I need to install it before the hot side, does that mean it will be hard to drill the manifold? And does a special place need to weld it since its made of cast (pretty sure its cast).

And I have no boost control at all.. The wastegate is blocked off. Is that bad? The pump only lets it boost up to 22 psi!

Another question.. I was driving my audi on the highway the first time yesterday (well first time with giles pump, release valve blocked off, and wastegate blocked off). I noticed on my gear pull that it boosted to 22 psi on WOT, than after a while it fell down to 14 psi.. and I was still on WOT, why is that?

[pointynoggin]

mine doesn't drop pressure, i have to back off due to egt.  I have a t3.  maybe one of the pros on this forum can tell you.

IIRC someone here had to jam the waste gate shut to boost high, i think it was a t3 as well.

[745 turbogreasel]

Another question.. I was driving my audi on the highway the first time yesterday (well first time with giles pump, release valve blocked off, and wastegate blocked off). I noticed on my gear pull that it boosted to 22 psi on WOT, than after a while it fell down to 14 psi.. and I was still on WOT, why is that?

part 6  messing with you.

[theman53]

Mine would drop pressure and egt would skyrocket. I think you are still gaining rpm but the the turbo is done making boost. I never did figure out what was going on. Giles pump maybe just the way it acts as that is what I had too.

center of the exhaust manifold drill and tap...don't buy a weld in.

With my Giles pump I could see 1650F if I got into it. Only did it a couple times. I tried to stay under 1300-1400F at all times, but usually would shift when I would see 1200F.

[carrizog60]

what about metal shavings due to drilling on manifold?
how do you keep it out?i am going to install one too but i dont want to remove the turbo apart since the hot side is welded to the manifold(clearance issues)

[R.O.R-2.0]

drill the manifold with the engine cold, and running. it will push any metal particles BACK OUT THE HOLE from the exhaust being forced out..

[VW Smokr]

drill the manifold with the engine cold, and running. it will push any metal particles BACK OUT THE HOLE from the exhaust being forced out..

Does it need to be said: "Eye protection advised!"

J.R.
SoCal

[745 turbogreasel]

what about metal shavings due to drilling on manifold?

What about them?
They will blow right past the exhaust wheel when you start the motor.

[tdotdub]

Mine would drop pressure and egt would skyrocket. I think you are still gaining rpm but the the turbo is done making boost. I never did figure out what was going on. Giles pump maybe just the way it acts as that is what I had too.

center of the exhaust manifold drill and tap...don't buy a weld in.

With my Giles pump I could see 1650F if I got into it. Only did it a couple times. I tried to stay under 1300-1400F at all times, but usually would shift when I would see 1200F.

hmmm that makes sense about the boost!

part 6  messing with you.

No its not, but thanks. I bought a block off plate for that from Giles.. It used to only boost to 12.. or 14. Don't remember. But now it boosts to 22!

drill the manifold with the engine cold, and running. it will push any metal particles BACK OUT THE HOLE from the exhaust being forced out..

Wow never thought of that. I'm dumb!

drill the manifold with the engine cold, and running. it will push any metal particles BACK OUT THE HOLE from the exhaust being forced out..

Does it need to be said: "Eye protection advised!"

J.R.
SoCal

Trust me.. I DO! Since last year I got a metal shard in my eye, and doctors told me I was so lucky since I could have lost my vision. Oh and it turned into a 3 month thing, since they could not remove it all at once! Now u only see me running around with safety glasses! And if haters hate.. Well let them!