EGT and Wideband Sensors...

[Audi180]

Hi...

I'm starting to prepare the engine for the swap...it's the rb26...where should i put the EGT sensor?i know the stock ones are on the turbo dump pipes, but i think it'll be inaccurate to put it there (too hot there...)

So where is the ideal location of putting it, should i get 2 sensors or will one be enough?

same about the wideband sensor, should i put it on the downpipe (on the connection where both pipes connects to one) ?

thanks,Tom

[Wulfgang]

Yes.

[Joe]

an EGT needs to go between the turbo and the engine. if its after the turbo your readings will be incorrect.

a wideband can go after the turbo.

[gawdzilla]

you want the egt to read the hottest air possible, almost as close to the head as you can get. it will be WAY too cool if you read post turbo. if you want you can run 6 egts, one for each cylinder. if you run 1, put it on cylinder 6- the leanest.

wideband is a replacement for o2, so you can put it in the place of the o2 sensor (on the turbo dump) or in that area.

[Ramius83]

For the most accurate readings, and if you have the money, just go with the wideband.

Specifically, I like the PLX Devices widebands. I ordered myself the M-300 wideband kit. Had it on the Maxima. very nice unit, small and easy to use.

Check it out.....

[Yellow4g63]

Zextronic wideband and EGT. Log em both see what your car is doing. I am going to install mine on #6 since the internet says it's the leanest one of them all.

[240z4u]

I did put mine at cyl. 6 and it gives good readings with fast response. Wideband is great, but wideband wont tell you wether or not your running too much timing. EGT is pretty nice to have. I have an older HKS that still works great. Its on its 3rd motor.

Evan

[blk90s13]

now question is how do u install it ? u need to use a special drill bit ? lots of wd40 or not ?

manifold on car of off all that would help for those who installed thier EGT

thanks

[Yellow4g63]

now question is how do u install it ? u need to use a special drill bit ? lots of wd40 or not ?

manifold on car of off all that would help for those who installed thier EGT

thanks

It depends on the bung you have to use. You can do it with the manifold still on the car. Just turn on the car and start drilling. When you break through the manifold all the metalshavings will be blow away and not into the turbo. Learned that trick on my DSM from some DSMers

[blk90s13]

wow that was fast

cool i was just wondering wut u did with the metal shavings but now its all clear i will be doing that tomorow

thanks again

[Audi180]

I allready have the HKS camp system with the egt sensor, and i have 2 turbos, so the best place is number 6 cyl?About the wideband sensor, i allready have the aem wideband with gauge kit, i had it on my sr, i have twin turbos, so i don't think putting it right after one of them is correct, or is it?

thanks a lot for your helpTom

[74260zt]

About the wideband sensor, i allready have the aem wideband with gauge kit, i had it on my sr, i have twin turbos, so i don't think putting it right after one of them is correct, or is it?

thanks a lot for your helpTom

That will tell you how your AFR's are running on that one bank. I'd try putting the O2 bung further down where they merge togrther, for a reading of both turbos...

[Wulfgang]

It does not really matter where you put either of them as long as they measure all six cylinders (after the pipes have merged).

Your EGT reading will not be "too hot" or "too cold" no matter where you put the sensor. In fact, the absolute value will tell you nothing at all. With EGT there are too many variables, so you can only do relative comparisons. If your EGT is running at say 800º today and your buddy's is running at 1000º today, then you can't make any comparison. Both engines could be fine or one could be detonating or both could be detonating. But if your EGT is 800 today, then you do some mods, and it runs at 1000 tomorrow, then you know your mods made you run a bit hotter. If you start to detonate around 1000, then you know that's your limit. On the other hand, someone else's car (exact same model with sensor in a different location) could start detonating at 800. That's their limit.

O2 sensor is the opposite. Put it anywhere (but not too close to the end of the tailpipe or you'll read ambient air) and it will give the correct reading. Lambda should not be dependent on the sensor's location. If you put it right after the turbo and it says 11.5, then it's 11.5. If you then move it to the end of the DP, it should still say 11.5. It is possible to damage the sensor if it gets too hot, but that shouldn't happen if you put it after the turbos.

[Darius]

This is the comment I remember from a long time ago on theoldone.com.

"All EGT probes, regardless of application should be installed at a location which would be 1/2 the primary tube diameter from the head surface. So if the ID of your primary tubes is 1.5", the hole or bung should be located .75" from the head side of the flange. You may place it at any angle to allow access to header bolts, etc. This is a position that's considered a "standard" for location in the automotive world, and allows people to compare apples with apples."

http://www.theoldone.com/archi...e.htm

A quick question about O2 sensor placement: The install instructions say to install above the 3 o'clock to 6 o'clock positions. What if my dp is too close to my firewall to be able to access the sensor from there? Does it matter that much or are they simply worried about moisture and condensation fouling the sensor? Would the 4 o'clock position be sufficient?

[gawdzilla]

do you mean 3 and 9? i think the reason for this is for exhaust condensation, but its not like your pipes fill with water from combustion. dont really see a problem with 4. mine was at 3, never had a problem. most widebands dynos have is just a long pole with the sensor strapped to it that they stick into your exhaust...

[Darius]

hahaha yeah woops...3 and 9 o'clock.

That is what I thought, but maybe they have to say that in order for their sensor warranty to stay valid. I'm not too worried as I'm probably going to end up mounting it on the vertical part of my downpipe anyways.

[BoostFab]

egt, put it on the turbo manifold, since you have one, it will be fine where the runners merge or runner 6.

wideband, in a turbocharged setup, should be mounted on the downpipe, not near the turbo--as the high heat and pressure will impact the accuracy of the sensor and will drastically reduce the life of the sensor. amke sure it's perpendicular to the exhaust tract.