does anyone know about what tempeture range the zpi exhaust manifolds run at??? does anyone have a egt gauge hooked to there zpi mani??? because my gauge is only reading 900 and that doesnt sound right

 

Your not looking for temperature of the manifold, you looking for the temp of the exhaust gases.

 

well I am looking for both, its a long story but I am running a temp a gauge on the maniold and one on the egt

 

For what?

 

just making sure that everything is running right, do you know what the manifolds normal temp is

 

No one puts a temp on the manifold, never heard of that, so your guess is as good as mine.

 

What is the point of having EGT and exhaust manifold temp? Sounds kind of redundant to me. I just run an EGT on my car.

 

But they run at differnt temps, I think the manifold should be around 800 to 900 and the egt can be over 1600 at times, btw I am only running the 2 gauges until I am all tuned with managment

 

There is no data/knowledge to be had or gained by taking temps from the manifold itself. That's what I'm confused about, what is the purpose of this? What are you trying to learn? Manifold temps tell you nothing about how the car is itself. Not to mention, the temps of the manifold will change if you get it thermal coated. So, again, I ask, what is the purpose of this cause you lost me dog.....lol?

 

EGTs are contingent upon tuning.

 

EGT gauge coupled with a good wideband O2 can tell you a LOT about how the motor is reacting to the boost, AFR, ignition timing etc.

 

Its true, they do run at different temps, but as the EGT gets hotter, the manifold will get hotter and vice versa. There is no need to watch manifold temp if you already have an EGT gauge. It is redundant to have both.

 

That's EGT, I'm aware of that (other wise I wouldn't have everything you just mentioned). What he is talking about is the Manifold itself. Look back at what he has, he trying to take temps of the manifold...AND EGT. Again, what is the point of taking temps of the manifold. Does nothing for telling you anything going on with the car. EGT is what everyone in the entire industry uses. First time I've ever heard of someone wanting to know how hot their manifold was.

 

Sure I need to know the maifold temp, so I can reduce the temp in my engine bay as needed, ie, turbo blanket and thermo wrap, if I am not making excessive heat then I don't need to do them, and if wrapping them make more heat(strain) on the manifold, thrn why do them.as I stated before I am only running a temp gauge on the mani until I am tuned with managment

 

Wrapping the manifold is not recommended. It will decrease the life of the manifold. Its not necessary to know the temp of the manifold for tuning. EGTs are what you need to know for tuning purposes.

 

i was getting 800s idle and i forget but i think 1100s in load. my hottest peak was almost 1700. i had my EGT probe into the exhaust manifold. the set up was more or less untunned running rich at times which explains the excessive heat

 

that was a temp probe for th egt right???? because right now i am running an egt probe in the mani that actually registers exhaust gases and one in a welded closed hole that is just is registering the manifold temp, and I am spiking at 1500 the highest on egt and 1100 on actual mani temp, I am just conforming that is right

 

I think you want to be around 1200 for EGTs.

 

I run between 1300 and 1400 pretty consistantly. A good tune would probably bring that down a little bit.

As far as the mani temp, that doesn't tell you under hood temps. Why not just get a simple temp gauge and put it somewhere in the engine bay, like near the air filter, to monitor under hood temps? That will be more accurate.

Wrapping the manifold is bad. Like Travis said, it will decrease the life of the manifold and can lead to rusting or cracking of the mani.

 

Paul is correct your EGT's are based on your tune! If you are running a high EGT with a rich afr 10.5-1 - 11.0-1 then you need to take some ignition timing out. If you are running higher afr under boost you definitely want to add fuel. Paul told me the tC's love fuel and he was absolutely correct! I understand where you were trying to go with the manifold temps but do not gauge it by this only gauge it by an actual EGT placed in the correct position!