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V10 Offroad Downpipes

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Discussion starter · #21 ·
Just to be clear, the only sensors I'm really interested in retaining are the primary O2 on the exhaust manifolds. For those who want to run cats, cats can exist and function without monitoring, can't they?
 
#22 ·
There is no secondary O2 sensor on the V10 TDI at least not in North America. It is possible to get a tune that takes the O2 sensors out of the control loop and runs just off the MAF signal and the base maps in the ECU. Although I don't think that would be a good thing to do engines ran that way for decades before more sophisticated engine controls became common.. The V10 is designed to use the 5 wire (wide band) sensor and I would keep it.
 
Discussion starter · #23 ·
I assume you are right on this because you were just in there looking and you have a 2007 presumably with the BWF engine. I suppose I saw a lambda sensor either pre-turbo or at the turbo on another vehicle, though I can't seem to remember where.

Well, then I'd definitely aim to keep the lambda sensors and just lose the exhaust gas pressure sensors and the fuel pumps.

Still keen on the idea of plumbing the exhaust gas pressure sensors into the exhaust manifolds and take them out of any control loops, keeping them just for informational purposes. Wouldn't it be nice to know the EMP/MAP ratio for tuning and VNT rod/stop adjustment?
 
#24 ·
The gas Tregs have pre and post cat O2 sensors the Diesels do not. At least not in NA.

If you install a tune that takes the DPF pressure sensors out of the control loop I don't think you will be able to access data via Vagcom for those anymore. I could be wrong. Without having the calibration curve for the sensor any data you might be able to gather using some other form of direct datalogging would be pretty much useless.
 
Discussion starter · #25 ·
I've been able to monitor stuff in VCDS even though the computer didn't act on it - secondary O2s in my other car, for example. Curve should be pretty easy to obtain; its a pressure sensor with a fitting on it. Not that complicated, after all :)

Who knows if the EMP will exceed the range of that sensor, though, or if another sensor with that range could output a useful value? Think 4bar MAP sensors in place of 3bar...
 
#26 ·
Post turbo should be way less than 1 bar. Pre turbo would be interesting just run a long length of tubing to allow for the exhaust to cool off enough that it doesn't kill the sensor.

I thought the DPF sensors were a differential pressure sensor and not absolute. Do you know exactly?
 
Discussion starter · #28 ·
As of today:
I have 5 people (myself included) with 100% commitment.
I have 4 people with 40-70% commitment.

I need 5 more definite yes's to get this going. Is anyone interested? Nudge your friends who don't visit this forum often and ask them to check this out, because I really want to make this group buy happen. Thanks!
 
#36 ·
I'm interested too. 2007 V10. Looking to remove the DPFs but leave the cat-cons. I've got a mechanic who can do the tune to flash out the tandem/regen. I plan to delete EGR. If you need more info, PM me.
 
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Discussion starter · #37 ·
Dieseldoc, one user in this whale of a thread has indicated that it should be possible to remove the downpipes without removing the engine, provided that you first remove the exhaust sensors.

Also, thanks, Horton, sent you a PM.
 
#38 ·
Dieseldoc. I just replaced both O2 sensors without dropping the motor and you can definitely get to the downpipe pipe to turbo fasteners although it does take some gymnastics and creativity and will likely require removing the O2 sensors first. As you will be swapping the sensors to the new pipes that shouldn't really be a show stopper. You should probably replace the O2 sensors as a part of the downpipe upgrade anyway, much easier than doing them later.

Take a close look at post #35 in this thread http://www.clubtouareg.com/forums/f93/v10-is-being-a-beast-crank-start-die-181434-4.html#post971074 You can see the two upper studs / nuts attaching the pipe to the turbo on both sides, there is also one underneath.
 
#39 ·
Mike N said:
Dieseldoc. I just replaced both O2 sensors without dropping the motor and you can definitely get to the downpipe pipe to turbo fasteners although it does take some gymnastics and creativity and will likely require removing the O2 sensors first. As you will be swapping the sensors to the new pipes that shouldn't really be a show stopper. You should probably replace the O2 sensors as a part of the downpipe upgrade anyway, much easier than doing them later.

Take a close look at post #35 in this thread http://www.clubtouareg.com/forums/f93/v10-is-being-a-beast-crank-start-die-181434-4.html#post971074 You can see the two upper studs / nuts attaching the pipe to the turbo on both sides, there is also one underneath.
Click to expand...
There are also 2 more bolts that hold the cat to where the turbo is mounted to the block. So at least 5 bolts would need to be removed plus of course the sensors.

Good luckBow Down

regards
Drag
 
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