There are a total of 5 bungs welded onto various exhaust pipes in this kit. Two of them are used for the factory O2 sensors. Does anyone familiar with this kit know if the others are suitable for use with a wideband or EGT sensor?

 

On mine the EGT bung is drilled on the up pipe to the turbo. After install if you remove the lower engine cover there is a pipe right behind the bumper going up to feed the turbo. This is where mine is...

 

Ok, so I'm guessing EGT would need to be located before the turbo then. The only suitable existing hole would be the one on the u-bend which where the drivers side O2 sensor goes. From the instructions it seems like the second factory O2 stays in place which leaves 4 holes in the exhaust piping after the turbo. Maybe one of these would be OK for my wideband? The Zeitronics instructions say that the probe should be located after the turbo so I guess one of these would work. I think I'll call Turbonetics on monday to get clarification on the intended use for the extra holes...

 

Yeah for the EGT you definitely want it before the turbo to read the true data from the exhuast ports without being run through the turbo.

 

By any chance do you have a pic of where your EGT is mounted? If it's working for you I'd like to get mine put in the same place.

 

I will take one for you tonight....BTW mine is in the same spot that Turbonetics used to check A/F ratios during testing...

 

Why is the EGT bung located so far from the manifold? Ideally, it should be an inch away from the exhuast port flange.

 

The bung I am using is the spot where they had their widebad O2... I used the same spot for the EGT since this kit uses the stock manifolds and I didn't feel like removing one of the stock headers just to weld on an EGT. It works just fine where its at...

 

Gotcha, just mentally make note that the actual EGT's are going to higher than actually displayed on your gauge. The EGT's drop dramatically as you move away from the exhuast port.

 

Are there guidelines like this for placement of a wideband sensor? I think the instructions for the Zeitronix said that it should go somewhere after the turbo but weren't much more specific. Can too much heat be an issue?

 

Absolutely...Ideally you would want a sensor or probe run on each runner within 6 inches of it leaving the exhaust ports. This is the only way to get a TRUE reading of what each and ever cylinder is doing. Since the is cost prohibitive most people run just one wideband right at a collector. This however is only going to give you the A/F ratio of one side. Or they run an EGT probe on the runner of what they assume is the hottest running cylinder. But again this can change as you change your cars setup so again it can be inaccurate. Although it is initially on inaccurate way of measuring by putting the probe on the primary feed tube to the turbo after both header flows have been merged I am theoretically "averaging" the EGTs for the entire motor. Although this will not provide the finite tuning a wideband does it does give you a good idea of total motor health. Of course a wideband is preferred and I will be purchasing one but in the meantime the EGT was a good cheap option. As for placing the Wideband it is not as critical as to where it goes compared to and EGT. The location I have would be good as it is before the turbo so you will read what the motor itself is doing rather then it being alterred even if slightly by the turbine...

 

anybody which cylinders runs the hottest?

 

I thought I read somewhere it was 5 & 6. I could be wrong though.

 

The only way to know for sure is to pull the heads off...

 

MIA - If you get a chance I'm definately interested in that pic of your EGT probe mounting location. Thanks!

 

+1

 

Ok, I got the scoop from Johnny at Turbonetocs. The placement of the 4 sensors is not very clearly detailed in the current manual so hopefully they'll fix that in the final version.

The A/F sensor from the driver's side exhaust manifold goes into the u pipe (second picture). The passenger side A/F sensor stays in the manifold. The 2 heated O2 sensors in the cat pipes go into the intermediary exhaust pipe (third picture). The order that they are installed in doesn't matter. The remaining 2 bungs in the last exhaust pipe (first picture) are for optional accessories such as a wideband A/F sensor.

Well I think that's the last piece of info I need so now I'm ready do my install on Friday. Wish me luck!!

 

Cool. I was going to post the pic tonight but I see you got it....good luck and congrats...