Has anyone installed an EGT gauge?

[Andy Cabrera]

I'm installing an EGT gauge in my '02 Trac and I was wondering if if someone knew the best location to drill & tap in a 4.0 for the sensor probe?

 

[scott degroot]

Why in the world would you put an exhaust gas temp gauge on a gas engine??

 

[Andy Cabrera]

I am leaning the mix and want to monitor the temp

 

[Robert Caffyn]

I thought they were used on diesel engines? You know, for when you're going uphill with a load and the turbo is burning bright red, then yeah. I could see a trans temp for your truck or even oil temp, but not EGT. Sorry, BC

 

[scott degroot]

cabrera,5/8/2010 20:04 MT



I am leaning the mix and want to monitor the temp

I'll bite...how and why?



As for location I would think right around where the exhaust pipe bolts to the exhaust manifold would be good location.

 

[Andy Cabrera]

Ok to answer the burning question as to why, I have successfully experimented with HHO in my air cooled VW and now I have built & installed a system for my Trac.

My initial testing has yielded a 30% MPG improvement. My concern is when you introduce HHO into the truck, the ECU reads it as a lean condition and compensates by adding fuel negation any MPG gains. By manipulating the O2 sensor signal to the ECU you correct this.

My concern is if my drycell stops producing gas for whatever reason, the first condition will be higher EGT due to the lean condition set by the manipulation of the signal.

So keeping a vigilant eye & monitoring data to avoid problems is my reasoning.

 

[EddieS'04]

IMO,the egt needs to be in the y-pipe, before main convertor.

Otherwise, if you have the money. I think you can buy a in vhicle Lamda unit. This would be more proficient, measuring the fuel/air ratio. I would hate to see you burn a piston. The trac motor is no fun to rebuild.



Egt, is most profient for tuning, when you put a probe in each exhaust port. Then you really need to know the temp varibles.

 

[scott degroot]

Very interesting. While the egt may be a good idea I would thing that a wide band monitor would be better....very interesting though

 

[Andy Cabrera]

re: Has anyone installed an EGT gauge? by L1TECHMember Profile,5/9/2010 15:46 ET



Very interesting. While the egt may be a good idea I would thing that a wide band monitor would be better....very interesting though

You may be right, I agree a wide band air/fuel ratio meter would be more beneficial than an EGT gauge. It would immediately display a lean condition and will provide a cross check on my O2 sensor signal manipulation.

 

[Andy Cabrera]

re: Has anyone installed an EGT gauge? by EddieS'04Member Profile1 Member Project,5/9/2010 15:16 ET



IMO,the egt needs to be in the y-pipe, before main convertor.

Otherwise, if you have the money. I think you can buy a in vhicle Lamda unit. This would be more proficient, measuring the fuel/air ratio. I would hate to see you burn a piston. The trac motor is no fun to rebuild.

Thanx Eddie.

BTW do you have any links you recommend that I can look at? Although I don't want to spend an arm & a leg I do have an open mind.

 

[Robert Caffyn]

Double-dip here... It was my impression that EGT sensors were mounted to the drivers side exhuast manifold, just downstream from the last cylinder for that side. This gives a cumulative sample, as an average of each cylinder' temperatures. This has been the "standard" for mounting one. BC

 

[EddieS'04]

Bob, those are the primary O2 sensors. They are the main feedback for the computers F/A ratio adjustments. The ones after the convertors are monitors of the final exhaust hydrocarbons..



cab, I will try to find the link of what I saw.

 

[Andy Cabrera]

Thanx Eddie!:supercool:

 

[Andy Cabrera]

Ok, I installed the EGT today. What a pain. Drilling the exhaust was the easy part, running the wiring & installing the gauge was a beast. Anyway, here it is... the EGT installed.

It's amazing how a simple leaning of the fuel mix, or the addition of

hydrogen can affect the exhaust temperature & consequently the

cylinder head temp.



Did a quick baseline testing of the system & how it affects the engine.

All my temps are in Fahrenheit.



Fuel Mix Normal, Hydrogen off (Stock Setting)

idle..............................450

40mph cruising in .........750

75mph cruising in .........950

WOT at 85mph............1100

doing a 12 mile hope on the highway





Fuel Mix lean, 325mv Hydrogen on (Full Hydrogen system On)

idle...........................425

40mph cruising .........700

75mph cruising .........850

WOT at 85mph.........1000





Fuel Mix lean, 325mv Hydrogen off (Just the Leaning of the Fuel Mix)

idle...........................625

40mph cruising .........950

75mph cruising .......1350

WOT at 85mph.........N/A



I clicked on the Hydrogen generator and watch the Exhaust Temp quickly drop from 1350 to 850.