Egts And O2 Sensors

[XKLABA]

I am about to do twin EGTs and twin Lambdas in to my R34 GTR and want to know what people are using and where you have placed them

My ECU will take any 5 wire O2 sensor so long as I can get the values for it otherwise it is preprogrammed for the NTK LZA-09-E1s, which I plan on putting at the start of the front pipes before the CATs

My ECU has twin K type thermocouple inputs for EGTs and they recommend 1.5-3mm hi inconel SS probe, which I plan on putting into the hole where the factory O2 sensors go

Any ideas or comments or suggestions, feel free to add any ideas you guys have

[GTSBoy]

I maintain that EGT measurement AFTER the turbo is a waste of time. There is a significant energy loss across the turbine. It is preferableto measure upstream the turbo. So, either in the manifold collector, or perhaps drilled into the turbine housing just after the flange.

I have my EGT sensor install exactly there (in the turbine housing). Has been there for 2 years now. Doesn't leak, hasn't caused any grief. Still reads the same sorts of temperatures at the same sorts of loads as it did when first installed, so clearly it is able to survive there. is good.

I'd say a 3mm inconel sheathed Type K theremocouple. Set up the fitting to insert the tip just a few mm into the gas stream. Job done. It does tend to measure the temperature of the housing itself a bit once the housing has been heated up by the gas on a heavy run, but it certainly reacts fast enough to gas temperature rising when the load increases.

[zebra]

Which setup are you using? Displays etc?

Keen to get both EGT at the collector and IAT's just before the throttle body, for no real reason other than it interests me.

[GTSBoy]

Mine is just a cheapy Taiwanese ProSport EGT guage. You know those stepper motor Defi clones. Came with thermcouple and fittings. I just drilled and tapped a hole into the turbo while it was off the car. That's the big hassle with fitting upstream the turbo - it's hard to impossible to do it on the car. Iand probably not a good idea to try either).

[zebra]

Cool, just saw those on eBay

Plenty out there

[XKLABA]

I'm only looking at the factory location due to room and hassle of fitting, the factory O2 location is easy enough to get ATM, ideally the collector area in the manifold would be ideal and definitely something I will be looking at when the motor comes out next time, and given it a running GTR its only a matter of time now

[zebra]

That rb26 confidence

[XKLABA]

its a confidence I have built up over the years of breaking them

so I've decided that I am putting the O2 sensors into the factory location and the EGTs will go into the manifold collector at a later date

[Badgaz]

most of the wideband o2 recommended locations i've read are 1 metre from the turbo dump.....why not just take the car to an exhaust shop and weld two sensor plugs into the exhaust before the collector underneath?

[linkems]

I removed both my o2 sensors and used a stainless adapter to run 1/8npt egt on dump pipes where the 02sensors used to be. One thing i overlooked at the time was using different metals, cast iron/brass/stainless all expand at different rates and although i haven't noticed it on my car a lot of people have problems with their threads loosening over time.

I also fitted a wideband sensor just before the cat. i wouldn't run the sensor too close to the turbo they aren't really made to be permanently mounted. a lot of people have damaged their sensors prematurely mounting off the dump possibly because of the extra heat.

[zebra]

Stumbled across this a few mins ago

expensive, but saves buying 11ty guages, will read everything from boost to exhaust manifold pressure, fuel pressure and temp, IAT's etc

http://www.zada-tech.com/product/multi-gauges/43-full-colour-tft-lcd-multi-gauge

[75coupe]

A few sensors ive seen are quite long, if i mount one jn the exhaust housing of turbo, how long does it need to be?

And if i get industrial thermocouples Australia to make some up for me what length do i tell them?

If i lower my intake temp through ceramic coating and insulators on intake plenum, fmic and piping will it make a noticeable dif to temp in exhaust housing?

[GTSBoy]

You only want the tip of the TC to stick in a few mm. In a big pipe like a dump it could go in 12-15mm and give a faster response to exhaust temperature changes without interrupting flow too much. But in the manifold collector or turbine inlet you only want the end of it peeking through.

My TC is bent. The insertable bit is only 30mm long or so, and it has the stainless olive/gland on it to screw down onto the stainless fitting tapped into the exhaust housing. If you get yours bent then a 50mm length on the last straight bit will enable you to insert it anything from just barely to more than enough, I should think.

Keeping the inlet temperatures cooler by, what, 30°C, isn't really going to have a noticeable effect on the exhaust temperatures. You might see a small decrease in temp (although be hard pressed to notice it) but given that the end effect of cooling the intake charge down is usually to put in more fuel and air and hence make more power, you might not expect to see much!

[XKLABA]

Stumbled across this a few mins ago

expensive, but saves buying 11ty guages, will read everything from boost to exhaust manifold pressure, fuel pressure and temp, IAT's etc

http://www.zada-tech.com/product/multi-gauges/43-full-colour-tft-lcd-multi-gauge

That is a good thing, just doesn't give the ECU inputs for safety protocols for engine cuts

This is what I'm going to get for my Syvecs soon

http://mobile.dudamobile.com/site/jti-site?url=http%3A%2F%2Fwww.jti.uk.com%2Ftoucan%2F&dm_redirected=true#2902

Speaks for it self really, its just really expensive but all inputs come from one of the CANBUS outputs from the ECU

[XKLABA]

The thickness of the sensor will also effect how responsive it is, I want to look at getting two made up 10-15mm long and 3mm thick and fit them into the collector part of the manifolds which has quiet an open area

[GTSBoy]

3mm is the only sensible option. It's a standard industrial inconel sheath size. I use them in all my site measurements on cement plants and so. At temperatures up to 1200°C.