Hi guys.
I have searched and tried to send PMs but I guess I am too new 
I have an RS4 with no manifold flaps. It drives great and makes reasonable power. I’d like to delete the flap actuators and resulting codes, along with the SAI system and related codes.
Can those changes be added to the JHM tune?
Are there any performance advantages to deleteing the manifold flaps?
PM Jake@JHM or CountVoughn. They can best help answer those questions.
I had the manifold off, installed JHM spacers and removed the port dividers - from here the flaps seemed superfluous so I took them out.
I gained almost 50hp between this and a carbon clean, not sure which contributed how much to the gain.
I tried to PM, guess I did it wrong Will try again.
Don’t take this the wrong way, but a gain like that is highly unlikely.
I’m not sure JHM did testing on the RS4 IM due to their discoveries on the B6/7 S4 manifolds, but removal of the B6/7 S4 flaps was very counter productive.
Do you happen to have vagcom? It would be interesting to see how your car accelerates on the road compared to cars without the flaps removed.
No offence taken.
The gain is very real. Same independent dyno under similar conditions. I did all the work myself so there was nothing to gain from the dyno operator. Carbon was a quite bad which likely accounted for most of the gain.
On the same day a V10 Audi C6 S6 with APR tune, intake and exhaust made less power.
The S4 flaps determined which runners to use, on the RS4 it simply guides the air to create more swirl. With the port dividers gone, all they really do is narrow the port in the manifold a little. I noticed no change in drive-ability, no bucking or surging, no noticeable torque loss at low RPM.
The flaps only operate at low load and low RPM while they create a restriction (very slight, but there) at full throttle.
MRC in the UK removes them all the time.
Welcome to AR.
Testing wise there is no gain on the removal of the flaps on the Rs4. The flaps actually tuck flat and flush when they are activated. Still of you do want to remove them leave all the hardware on just pull the pin out for the arm flaps. I would have to assume if jhm has the flaps still installed on there record setting list of Rs4 cars that there isn’t any gain in removing them.
I know they solved the code issue for APR customers that couldn’t pass emissions so they have the ability. However there isn’t any gain in removal of the flaps. The one car I helped remove the flaps on was a stock rs4 and the only difference was the car started like cap in the winter. Also the flaps help with keeping carbon at bay Removing the port separators is where the gains are. Mrc sells tons of stuff that doesn’t work we have proved it here. Don’t listen to mrc
The SAI system I know they can and do offer help with.
I would suggest putting in the flaps again. Even if it’s just for cold start and to help tell others how it made no difference. If your dead set against it put the arms on levee the flaps of and you won’t geta code. I never got a code when I removed the flaps on the stock car we did the removal on
Good to know, I just haven’t read much about JHM messing with the RS4 flaps so it’s likely not worth the effort.
Have you done any acceleration testing? 1/4mile, Vbox, VCDS logs?
The flaps have been out for a year, through a crappy Chicago winter. No issues. No going back because they are long gone.
I want to remove the actuators to make space under the manifold for my next experiment ;D
Once I get my car back I will do some logging. It is getting some cosmetic attention at the moment
Are we talking the flaps that are actually located in the runners of the IM? I removed them with my carbon clean since they are a PITA to clean, and IIRC are recommended for removal jaw. IM spacer install…
I’ve reinstalled my flaps after thinking there’s nothing to gain and questioning their effectiveness in cold starts and carbon. Cold starting was slightly effected for the better with the flaps. Carbon wise was the biggest difference. A marked improvement in the carbon buildup for the better with the flaps in. Power wise it made zero difference.
I too never got a code when I removed the flaps. I’d be interested in what people are doing wrong to get a code.
Oh lastly the removal of the port spacers was helpful. I didn’t put them back in.
Yes, those ones.
I was able to get them out with a very small ratcheting wrench and torx bit - I didn’t remove the plugs. Dit you do it yourself?
I don’t have a code yet because I still have the actuators. I want to remove the actuators to make space under the manifold. Once removed it will trigger a code.
So your most definitely one of the smart ones.
I’d love to hear why you need space under the manifold. Of you’d care to share.
The port seperators sure. The manifold flaps, there’s no reason and no gain in removing them.
As for MRC, they’re good guys who have some good products, but not everything they advise makes sense. MRC also sells a port and polish intake manifold option for $1000…and it does nothing as well. They also used to sell PES M90 superchargers which make your car no faster than decatted stock exhaust + a JHM tune. They also sell carbon fibre open element intake airboxes…all of these ideas are shit. The only way these things make you faster is by making your car lighter…because you have less money in your pocket. So don’t necessary follow their word as dogma.
Some people have complained that the car runs rough on cold starts without the flaps. Not sure where you live. If it’s Dubai, you’re probably set. If it’s anywhere else, you may want to put them back in.
NY07RS4 did this…and hated it…and put them back in. He lives in New York ( i mention him because he’s on here and will hopefully comment). A bunch of other guys in places where winter exists have done the same (removed…hated…reinstalled)
As I’ve mentioned myself included.
I’d have to speculate that if one removed the flaps in the summer you’d not remember just how big of a difference there was.
The flaps have been out for a year, through a crappy Chicago winter. No issues. No going back because they are long gone.
I want to remove the actuators to make space under the manifold to increase the manifold plenum size. I’ve done it on other platforms and it yielded nice torque and power gains.
I’m sure if it worked Audi would have done it, but who knows whether try tried. If spacers work, why didn’t Audi use them? Maybe the part throttle response was more important which led to the space consuming flaps and actuators.
This thread was not to argue or cause debate, it was simply to see whether the codes can be deleted as part of a JHM tune.
I like tinkering and I do it myself so it is ‘free experimenting’
how do the separators work? how do u gain power removing them? is it just an increase in flow?
They are a low speed thing. Once you get a jhm tune you don’t need them. Pulling them out helps with a less disturbed flow
If it helps and this is what your looking to do
http://audirevolution.net/forum/index.php?topic=2721.0
it helps the rs4 even more. Not sure if that’s what your looking to do.
AR is different from other sites nobody really is arguing here is more like saying. Try what you want this is what I saw. I wasn’t trying to argue so sorry if it came out that way. Just wanted to share what I saw