Turbo egt probe placement

To receive optimal statistics from your Pyrometer Gaugeit is recommended to install the EGT probe at the pre-turbo location of your exhaust manifold. Many users may tend to install the EGT probe at 12 inches past the location of the turbo which results in misleading temperature statistics.

This is an extreme difference in the temperature being displayed on your gauge which is inaccurate from the actual performance of the EGT. If your EGT is running too hot and you are unaware, it can lead to major engine break down including burning oil which leads to coking and melting internal components such as the pistons and crack heads.

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To receive optimal statistics from your … By Mike C June 27, By Mike C. June 27, I found this helpful I did not find this helpful. In this article Blog Posts. GAUGE 1.Welcome Guest Login Register. Should there be doubt concerning in which exhaust tube or specific placement of the probe, you should check with the engine manufacturer or your engine builder. There are two basic ways EGT probes are installed in multiple cylinder engines either for monitoring a bank cylinders or individual cylinders.

turbo egt probe placement

Monitoring a bank of cylinders will give you averaged information about the over all exhaust gas temperature generated. The probes are connected to high temperature thermocouple wire and a connector and then to either a dual channel meter or two single channel meters for monitoring in the vehicles' cockpit.

One of the considerations of the installation is the distance from the exhaust valve to the probe sensing junction. The farther from the valve the lower the readings will be giving an average of the four cylinders in each bank. This keeps the ability to gather the necessary temperature information simple and less expensive.

If you require more exact temperature readings of each cylinder you may consider installation of probes near each of the combustion chambers exhaust valve. This installation is more complicated and requires the distant of the EGT probes from the exhaust valves to be consistent keeping the variation in temperature to as little as possible.

The constancy in probe distance from combustion chamber will insure even and reliable readings. An advantage of the EGT monitoring verses monitoring the cylinder head temperature is a more immediate response to change in temperature. The change in cylinder head take a much longer time since it has a lot more mass to heat.

turbo egt probe placement

The peak or point of maximum temperature is the basic reference for performance management. Tuning for specific atmospheric conditions can be critical on race day. The peak temperature in each cylinder will vary with different power settings, changes in altitude, and ambient temperature. Typically a hand held digital readout like the dual channel or single channel meters The Sensor Connection offers will have the ability to read individual cylinder exhausts or cylinder banks.

Multiple channel data acquisition systems will gather and display data from all exhaust port temperature readings simultaneously. The requirements for precision of the data collection of your application will determine the type of data collection system you will need.

From the peak EGT, either increasing or decreasing the fuel to air ratio causes a change in Exhaust gas temperature. Richer EGT cooling occurs because there is excess fuel cooling the exhaust stream via less than optimum burning, and leanerheating occurs because there is excess air oxygen making for a hotter burn. Peaking exhaust gas temperature EGT with a carbureted engine is frequently a vague point because of less efficient atomization compared to electronic fuel injection to the individual cylinders.Remember Me?

Advanced Search. Results 1 to 9 of 9. Where do you guys put the EGT probe in the exhaust manifold? I'm thinking location C in the picture below.

Originally Posted by skullzaflare. Originally Posted by Clouse. When you say adapter, are you referring to like a threaded weld-on bung? Drilling and tapping the manifold should work just fine, however; I did mine my way because I had access to my dad's machine shop and didn't want to modify such a "rare" exhaust manifold.

Originally Posted by cadguy Using the spacer on the exhaust side moved the entire turbo out.

EGT Probe Performance tuning Installation and Information

The easiest place for me to fix the gap was between the intake manifold and the head. Like I said before, the easiest solution is to simply drill and tap the exhaust manifold.

I've since picked up another 2 diesels, and another 3 manifolds, and knowing what I know now, I probably would have just taken the easy way out. I'm in the same boat with the 83' setup, though I'll be running a front mount intercooler shortly, so the offset from a spacer wouldn't be an issue. Seeing as the 4d55 heads are not crossflow the exhaust and intake are on the same sideI've considered making a phenolic spacer for the intake manifold to help insulate it from the exhaust heat.

Probably not worth the effort, but it'd be an inexpensive project that arguably helps reduce intake temperature and could have the added benefit of offsetting the intake to match a spaced out turbo. For now I'm going to just drill out the exhaust manifold at location C if I can fit my drill in there, otherwise it'll go in A. EGT sensor on a turbo goes before the turbo. Members come and members go, But the board keeps track of them.

Or look on YouTube Click Here. Tags for this Thread egtplacementprobe. Bookmarks Bookmarks Google Facebook. All times are GMT The time now is AM. All rights reserved.My application is slightly diffrent to most on here, it will be implemented on a cc single cylinder 2 stroke engine, and I'm hoping that the EGT sensor placement theory is similar to a 4 stroke and that im not going to have to worry about back pressure waves from the expansion chamber intafearing with the readings.

I would imagine that heat radiation from cylinder could alter the readings as well as possibly flame front reaching the sensor if it were placed too close? What is the application for this engine? Are we talking go kart, dirt bike, generator? Do you expect it to run mostly a steady throttle or steady rpm most of the time or will it be constantly changing like a normal automotive application?

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Can you install a wideband into the exhaust pipe or use a 5 gas emission analyzer if you have access to it? An EGT is going to give some relative change as it gets richer and leaner but you won't get much insight into how it's burning beyond that.

Arghx7 This engine is mainly used as a development engine in a motorbike to see how much the design can be improved, how much extra horsepower can be gained on pump petrol and to then see how much power can be made on alternative fuels such as ethanol.

It will also go out on track but that's not it's main pupose. I was told that Lambada sensor was a no go in a 2 stroke due oil intafearing with Lambada readings, as well as unburnt oil clogging the sensor up.

Achieving the correct EGT is in the real world is important to me, and I will know the target temp. As for the second reason, the exhaust will work it's best at its target EGT, as temperature affects the speed of preassure waves, which is important in a 2 stroke due to lack of exhaust valve so that the preassures wave going back to the cylinder "blocks" the exhaust port so that unburnt mixture is not lost, improving the efficiency.

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It also alters how the power is delivered. For the purpose of testing on the Dyno limited time keep in mind I am guessing that there will be a lot of steady throttle runs, but on the track it will be constantly changing. The exhaust is made for top of rpm range in mind.

The egt sensor I was planned to use is a mainline EGT sensor with cold junction calibrated guage. I have not considered a gas analyzer so far. Would I run into the same issues that I would with lambada? Also I'm not sure how much the things I was told about lambada use in 2 stroke are true or not. Maybe there's a way to compensate for oil in the mixture and get correct readings. Attachments may only be downloaded by paid Gold members. Read more about becoming a Gold member here.

You can put the thermocouple as close as you can access. The temperature range on that sensor you listed is way hotter than your engine is going to get. For example, a modern turbo direct injection engine will run around C before the turbo.

If you have a target temperature it's going to be more useful. A gas analyzer is absolutely going to give you the useful readings, but they are not going to measure quickly in fast transients. For example, lean it out and your CO goes lower and lower.User Name Remember Me? Any thoughts on EGT probe placement and how good the readings are? How much might the readings be effected by being after the turbo?

Thanks, Ben. Well, think about this I'd think I'd want an exhaust temperature probe mounted before the turbine blades, so you know how hot the gases are that are hitting the blades while the exhaust gas is under temperature and pressure.

EGT sensor placement

TDI s : 99 beetle and 04 jetta. People with post-turbo EGT say "just add degrees to it and you have pre-turbo temp" This is not true at all, and less true at higher power levels where it matters most, because: The turbo removes energy heat from the exhaust gas to spin the compressor wheel.

At higher power levels there is more boost, and more EGT, and more energy required to spin the compressor, because as a turbine gets closer to its max capacity "choke" it becomes less and less efficient. This means it needs more energy heat from the exhaust per psi of boost as it gets closer to its limit. While the "add degrees" thumbrule might work ok at steady state lower power levels, who cares about what EGT is at idle or light load, I care about EGT when it's pushing the limit so I know when to back off.

The trouble is, the turbine might require or degrees worth of energy to make the higher boost, which makes the "add degrees" thumbrule a dangerous oversimplification. Thanks to all, for the replies. As I will work to in stall the probe before the turbo. Thread Tools. All times are GMT The time now is TDI Club Cards.

TDIFest Gone, but not forgotten.Discussion in ' Dodge 3rd Gen Cummins 5. Log in or Sign up. If your only gonna add one egt probe should it be pre or post turbo.

The point of a pyro is to know whether or not you are about melt the pistons or not. The purpose of a turbo is to convert heat energy in the exhaust gas into compression forces on the compressor side. It sucks heat out of the exhaust gas. Knowing the temperature downstream from the turbo won't tell you whether or not your pistons are in danger. Where at in the exhaust manifold should it be placed on a 5.

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Joined: Jul 15, Posts: 19 Likes Received: 0. Try the forward side of the manifold, just off center. DO NOT drill in the middle. I'll get some pics of mine up here If I can figure the puter thing out. RichJul 23, I attached a picture of where I put mine. The white cross is where I drilled. This is a 6. JPG File size: Thanks for the help.

turbo egt probe placement

Forward or after the turbo is acceptable but you will read to degrees lower for hotrodders with chips I would agree pre turbo but for a stock work truck or tower after turbo. All class 8 trucks come from the factory with the pyro post turbo whether it is Cummins, Cat, Detroit or Mercedes.

Jim OAug 1, Turbo engines, it is the preferable the probe in front of the turbo inlet for higher accuracy and sensitivity. The short cast iron section of exhaust manifold and the first section of thin-walled pipe are other areas.

Regarding non-turbo engines, the long exhaust runner is most accessible. The next area for consideration is the upper section of the exhaust manifold collector. The probe should be installed in the exhaust manifold closest to the exhaust outlet at the head this is the closest physical location to the exhaust valve. EGT probe placement close to the exhaust valve isn't always easy.

If you don't have a turbocharged engine, the exhaust manifold can be drilled and tapped while remaining on the engine.

However, doing this on a turbo engine without removing the manifold is not recommended and can potentially cause failure of the turbine from drill fragments getting into the turbine. Drilling a hole in the thin-walled exhaust tube using a clamp style EGT probe fitting is the simplest method.

A robust method is a bung welded into place, thus screwing the EGT thermocouple adapter into the bung. Stainless steel adapters are preferable and much better than brass.

They withstand higher temperatures, temperature cycling, better anti-corrosion and structural stresses occurring in exhaust systems. Diesel engine applications use long primary extractors. Placement of the EGT probe on a runner close to the head depends on your particular application. It is your decision to detect the temperature of the exhaust gases at the collector or just one cylinder. General use applications require one EGT probe per cylinder bank installed either near the head exhaust valve or at the collector.

The exhaust gas temperature is lower the further from the valve, thus leading to slower and less accuracy in EGT probe readings. However, probe installation further away from the head is typically easier since there is more room from other engine components. Typically EGT probes are installed in different methods. Clamp type installations require a hole drilled just large enough to take the probe, and a large clamp, much similar to a radiator hose clamp, secures it.

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This clamp need to be good quality to withstand the high exhaust temperatures, and is often stainless steel. Alternatively, and our preferred approach, is to drill and tap the manifold or headers to accept a compression fitting that holds the probe in place.

This also permits the probe depth to be adjusted, and the assembly removed and hole plugged with appropriate threaded bolt when the EGT probe is no longer required. Weld on bosses may be required on thin walled tubing sections.

EGT Diesel Engine Installation Information

If you are after more power, you may need to lower your current exhaust gas temperature to permit increased boost and fuel delivery. Typically this can be achieved by the use of properly sized turbo dump pipe to increase exhaust flow, mixture adjustments, increased boost and improvement in the induction system for higher efficiencies.

Locate the EGT gauge easily visible to the driver and with an audible alarm. This will alert the driver if safe operating temperatures are exceeded. Disclaimer: The Sensor Connection is not responsible for any information which is posted. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information that is expressed or implied. Welcome Guest Login Register. The installation position of an EGT probe is important and requires planning in your diesel engine application.

Installation locations in turbo and non-turbo engines are different for EGT probes and require consideration.

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EGT Probe Installation Methods The probe should be installed in the exhaust manifold closest to the exhaust outlet at the head this is the closest physical location to the exhaust valve. EGT Probe Accessories. Dash and Panel Mounted Multi-channel Pyrometers. Excellent Value!

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