Swirl flap delete?

[ramboss6]

Has anybody ever done or heard of swirl flap delete on these 4.0tt engines. My swirl flaps motors need changing, I have code p2005 P2006 flaps are stuck closed. I can either get em fixed with parts from a breaking rs6 or I can get them deleted by a local remapper. Been told with deleting them I won't have to worry about the motors in the future and carbon build up. I'm tempted to go deleted, can anyone advise?

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[Burkeomatic]

I mean, you would still need to worry about carbon build up on the valves. As far as downsides? Who knows. I have wondered about deleting it myself. You would probably lose some low or mid range if I had to speculate. But, you might gain a little top end (by removing something in the intake path) and have one less thing to break, more importantly. If someone had a tune that deleted them, I would be interested in trying it myself. It would probably take someone doing a back to back dyno to know for certain.

I haven't found anything of the such myself. I am getting ready to port a blower, and do a intake cleaning service on my car here in the near future, maybe I can contact my tuner and see if they can tune it out. Since I'll be doing a ported blower, I highly doubt that I would be able to quantify any gains/losses since it would coincide with a ported blower and intake cleaning if I did infact do it.

The worst that can happen is try it and let us all know. Try to log before and after. Some of the best things on cars come from ignoring what every person on the internet and the armchair engineers and bench racers say and just doing it. IE: "they're there for a reason" and "so you think you are smarter than Audi engineers." Well, we would all be driving stock cars if that held true. Also, some of the worst things happen like that too. If it works, you get 5 minutes of internet fame. If it doesn't, you have everyone, including people who weren't involved in the conversation suddenly become experts saying I told you so. Such is the internet car world. This is also why some people don't post innovations they're trying, and they are quite intelligent people. For instance, I have a buddy with a junk yard build Miata, a bunch of parts that "don't work," "will fall apart," and "will make his car blow up," running a "sub optimal" batch injection and wasted spark set up on a 20 year old standalone, and he runs 11's all day and traps in the 120's and has been for over a decade. Faster and more reliable with than many who have a car with $10k of parts and a blown motor sitting in their garage. He won't post his set up, when there is lots to be learned from it.

[ramboss6]

I mean, you would still need to worry about carbon build up on the valves. As far as downsides? Who knows. I have wondered about deleting it myself. You would probably lose some low or mid range if I had to speculate. But, you might gain a little top end (by removing something in the intake path) and have one less thing to break, more importantly. If someone had a tune that deleted them, I would be interested in trying it myself. It would probably take someone doing a back to back dyno to know for certain.

I haven't found anything of the such myself. I am getting ready to port a blower, and do a intake cleaning service on my car here in the near future, maybe I can contact my tuner and see if they can tune it out. Since I'll be doing a ported blower, I highly doubt that I would be able to quantify any gains/losses since it would coincide with a ported blower and intake cleaning if I did infact do it.

The worst that can happen is try it and let us all know. Try to log before and after. Some of the best things on cars come from ignoring what every person on the internet and the armchair engineers and bench racers say and just doing it. IE: "they're there for a reason" and "so you think you are smarter than Audi engineers." Well, we would all be driving stock cars if that held true. Also, some of the worst things happen like that too. If it works, you get 5 minutes of internet fame. If it doesn't, you have everyone, including people who weren't involved in the conversation suddenly become experts saying I told you so. Such is the internet car world. This is also why some people don't post innovations they're trying, and they are quite intelligent people. For instance, I have a buddy with a junk yard build Miata, a bunch of parts that "don't work," "will fall apart," and "will make his car blow up," running a "sub optimal" batch injection and wasted spark set up on a 20 year old standalone, and he runs 11's all day and traps in the 120's and has been for over a decade. Faster and more reliable with than many who have a car with $10k of parts and a blown motor sitting in their garage. He won't post his set up, when there is lots to be learned from it.

Thanks for the detailed write up, so answering your question yes they can be mapped out almost any tuner can code them out, however my tuner says to delete the flaps physically and then code them out. He claims its more a bodge-job if I just map them out but I think he speaks specifically regarding my car since the flap motors are not working. I've decided to remove them which my audi independent will do on Tuesday, my mapper will then come to me and do the necessary coding and also remap tweaks if required. Since the flaps will be physically removed, I think all he'll have to do is code and delete the flap motors/operation.

Regarding carbon build up, my mechanic says its not common on these engines, I will speak to him on Tuesday to see if there is any build up.

I know bmw and audi diesels do swirl flaps deletes often since there more prone to build up especially on bmw the flaps can go into the engine causing more issues. I don't think that an issue on 4.0tt. But yes Tuesday I will get an update and also experience stage 2.

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[Burkeomatic]

Thanks for the detailed write up, so answering your question yes they can be mapped out almost any tuner can code them out, however my tuner says to delete the flaps physically and then code them out. He claims its more a bodge-job if I just map them out but I think he speaks specifically regarding my car since the flap motors are not working. I've decided to remove them which my audi independent will do on Tuesday, my mapper will then come to me and do the necessary coding and also remap tweaks if required. Since the flaps will be physically removed, I think all he'll have to do is code and delete the flap motors/operation.

Regarding carbon build up, my mechanic says its not common on these engines, I will speak to him on Tuesday to see if there is any build up.

I know bmw and audi diesels do swirl flaps deletes often since there more prone to build up especially on bmw the flaps can go into the engine causing more issues. I don't think that an issue on 4.0tt. But yes Tuesday I will get an update and also experience stage 2.

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Cool, let us know how it turns out. I researched and found where lots of diesel folks were deleting theirs. Are you going to do something to fill the holes left by the shaft that held the flaps, or just leave them as "balancing chambers?"

[Audisthesia]

Curious, would physically removing them cause any boost leak?

On a side note, at least the Audi design doesn't allow the flaps to break off and cause a catastrophic failure like the BMW design.

[ramboss6]

Cool, let us know how it turns out. I researched and found where lots of diesel folks were deleting theirs. Are you going to do something to fill the holes left by the shaft that held the flaps, or just leave them as "balancing chambers?"

I'm not too sure about that, I'd have to see what the mechanic and mapper say and take it from there.

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[ramboss6]

Curious, would physically removing them cause any boost leak?

On a side note, at least the Audi design doesn't allow the flaps to break off and cause a catastrophic failure like the BMW design.

Funny you mention this, I had a boost leak a few weeks before the flap motors started failing. I took it to audi to diagnose and they said it was a boost sensor G31, they didn't replace the part just swapped if around for the second boost sensor, not sure why they didn't just replace the part. I don't think it's related though but could be.

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[Burkeomatic]

Curious, would physically removing them cause any boost leak?

On a side note, at least the Audi design doesn't allow the flaps to break off and cause a catastrophic failure like the BMW design.

If the rod was removed where it exits the manifold, yeah. You would have to thread it and block it with a plug, ramming a basic $1.00 brass plug from Lowes racing does the trick. Just tap it, and screw it in with a little silicone on it. Lots of people removed these on cars, and that is how I have seen them take care of the hole in the manifold. I cleverly removed one and repurposed it for a manifold signal tap for a blow off valve once. I was more wondering if he were going to do something about the holes that would be between the runners, I thought plugging the external holes would be a given. If it were me, I wouldn't bother plugging the holes between the runners for 2 reasons. 1. there is always a chance whatever you used to plug it could work its way out. 2. I doubt if would make a flow difference, and if anything, could balance pressure differences between the runners.

[ramboss6]

If the rod was removed where it exits the manifold, yeah. You would have to thread it and block it with a plug, ramming a basic $1.00 brass plug from Lowes racing does the trick. Just tap it, and screw it in with a little silicone on it. Lots of people removed these on cars, and that is how I have seen them take care of the hole in the manifold. I cleverly removed one and repurposed it for a manifold signal tap for a blow off valve once. I was more wondering if he were going to do something about the holes that would be between the runners, I thought plugging the external holes would be a given. If it were me, I wouldn't bother plugging the holes between the runners for 2 reasons. 1. there is always a chance whatever you used to plug it could work its way out. 2. I doubt if would make a flow difference, and if anything, could balance pressure differences between the runners.

I mean audi Sheffield which is around 40 miles from me did some work but they'd only offer to diagnose and fix my car if the recent faults were related to G31 boost sensor. After asking a few mechanics they stated it wasn't related so i had to take it to local audi independent. Besides the brake servo pipe is loose so I didn't want to travel all that way with hardly any brakes , what you've mentioned I'll send that over to my guy and get his opinion tomorrow, I think he'll just remove them and be done with it. All the tuners I spoke too say its best to take them out rather then repair.

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[Burkeomatic]

I mean audi Sheffield which is around 40 miles from me did some work but they'd only offer to diagnose and fix my car if the recent faults were related to G31 boost sensor. After asking a few mechanics they stated it wasn't related so i had to take it to local audi independent. Besides the brake servo pipe is loose so I didn't want to travel all that way with hardly any brakes , what you've mentioned I'll send that over to my guy and get his opinion tomorrow, I think he'll just remove them and be done with it. All the tuners I spoke too say its best to take them out rather then repair.

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Yeah, I am in their boat, just pull them out, plug the external holes, and be done with it.

[Gingermatt]

I know this is old, but was googling like crazy to find out if anyone makes a swirl flap delete for the 4.0tt, I see them for nearly every other Audi and vw motor, but can’t find anything for this one

[Audibellybutton]

The flaps are not easy to remove. But I have seen level performance do it for their custom intake manifolds. This is an engine out job you are considering. And also both your flaps are bad throwing codes… are you sure it’s not a vacuum leak? Much simpler to fix than removing an engine and coding out flaps

[Audibellybutton]

The flaps are not easy to remove. But I have seen level performance do it for their custom intake manifolds. This is an engine out job you are considering. And also both your flaps are bad throwing codes… are you sure it’s not a vacuum leak? Much simpler to fix than removing an engine and coding out flaps

Whoops just realized this post is old. I wonder how the flap removal attempt went lol smh at whatever mechanic recommended that to him over fixing the issue