i just ordered the isspro pyro gauge, i ordered pre-turbo..i remember hearing this may be better because it is more accurate...just looking for some opinion and also safe egt temps when installed.....thanks

 

I agree, I'm pre-turbo as well for the very fact that we need to know the temp's going into the turbo. You of course know that had this been the &quot;OTHER&quot; site, you'd be starting a &quot;war&quot; but that won't happen here. We even know some who measure both pre and post. I'm happy with my results. <br><br>~Dave

 

I've measured both and also ridden snowmobiles all my life modified and always used the manifold for the most accurate temps. The hottest part of the flame is in the manifold so you know more accurately the actual cylinder temps. Take about 1350 for 5 seconds to be your max EGT 1200 all day long is not a problem pre turbo. If you go post you would be in for a big surprise how hot you actully are in the manifold. I was seeing temps about 600 degreese in the downpipe and about 1500 in the manifold where would you like to be

 

I had post turbo on my old '99 3500, and was satisfied to have the reference point of knowing what was going on in the motor. Having said that, I have the guages on order for my new truck (see sig) that will be pre-turbo for the reason of improving the accuracy and response time of the pyro. I have seen many threads about allowable temps, but would not sustain (pre-turbo) of more than 1100, since the turbo casting material approaches molecular degradation at around 1250 sustained, and I like a little lee-way, so I'll keep it at or below 1100.

 

So why don't more pyro user'ers use pre and post probes with a toggle switch between them? This way at a flick of the switch you woud know both temps.

 

There is a way to do this. I would lov to do it on mine but it is a little trickier with the way that my EGT gauge is setup. Somebody on here at one time posted directions on how to do both. I went from opst to pre cause I was starting to hit 1000 post and decided that that was way to high to be post and I wanted to know what pre was.

 

to see pre and post hookup at same time...<br> http://www.showmestate.org/stltdr/ho...T_how_to.shtml

 

A few months back I saw a pre/post gauge. This gauge read both at once. Problem was it was a 3&quot; gauge. I cant remember the brand name, but was told it was from a company that wasn't very reliable. Why cant one of the big gauge companies make up a 2 1/16 dual gauge for egt? ???

 

There are set ups for snowmobiles that put two and even three EGT's into one 2 1/16&quot; gauge. Check Dennis Kirk's snowmobile section, I know for a fact they have them since sleds are multi cylinder.<br><br>John<br><br>

 

From www.westach.com<br><br>

 

Class 8 trucks whether they have a Caterpillar or a Cummins or a Sixty series Detroit engine measure the exhaust temp after the Turbo. I can see measuring it pre turbo on a radically modified engine but for a stocker or mild modified engine I will go post turbo. I agree with 1100 degrees for a pre turbo and about 950 post turbo or maybe 1000 for a short time,( if you can see the end of the hill). Have you ever seen the exhaust wheel of a turbo after a Pyro thermocouple went through it, not a pretty sight.<br>Jim O

 

Jamie did I read that right, 1500F pre and 600F post? I thought the maximum difference was 400 from pre to post turbo measurements.

 

Not always depends oh how well you turbo is working. That is the difference I have seen between Pre and post and from years of 2 stroke tuning I would always go Pre for our trucks.

 

Hi guys. been out a while so appologies if my comments are redundant. Essentially the question you have to answer pre-versus-post is this: what are you trying to measure and why? there are arguments both ways but consider this: if your truck is modified to the point of requiring an EGT guage, then you must ask why it is required. In my opinion, the answer is that you are trying to protect things &quot;up stream&quot; from the turbo (pre). Not to say that downstream isn't important -- just that manifold temps and deformed cylinders is the enemy you are shooting at. <br><br>You can make an argument for post turbo -- turbo cooldown for example, but then you have to do some mental correlation work to use a post turbo measurement to protect your cylinders --- the 300 degree pre-post differential is a rule of thumb that probably doesn't apply to modified fueling. On the other hand, a pre-turbo measurement means that you have to do some mental correlation work to arrive at a save cooldown.<br><br>In my humble opinion, the latter is a greater risk. Your most important and most accurate reading, for the purpose of protecting the expensive parts under the hood, is pre-turbo EGT. Then use some mental correlations to arrive at a suitable cooldown time to protect the turbo.<br><br>both, of course, is best. gotta love that westach that was posted! -dlleno

 

I need an EGT gauge that goes higher than 1500.