[Len_Beach]

I've just bought a replacement inlet manifold for my N57 330d to remove the swirl flaps and I have booked in for a walnut blast.

This got me thinking about the EGR as it was left active after my remap.

I did some playing with Rheingold and adjusted the EGR to the maximum fresh air value of 0.7.

The effect is that the throttle response is much more linear. When cruising then accelerating hard; there used to be a hesitation like turbo lag then a surge in power. Since making the adjustment; the throttle reacts to inputs much more progressively.

Low speed cruising definitely takes less throttle input.

I've yet to see if there's any improvement in MPG and I'm going to reset a couple of other adaptations such as MAF and MAP to ensure everything is in sync.

In summary; this is well worth a go to minimise exhaust gas recirculation and improved driveability.

[R99]

Originally Posted by Len_Beach

I've just bought a replacement inlet manifold for my N57 330d to remove the swirl flaps and I have booked in for a walnut blast.

This got me thinking about the EGR as it was left active after my remap.

I did some playing with Rheingold and adjusted the EGR to the maximum fresh air value of 0.7.

The effect is that the throttle response is much more linear. When cruising then accelerating hard; there used to be a hesitation like turbo lag then a surge in power. Since making the adjustment; the throttle reacts to inputs much more progressively.

Low speed cruising definitely takes less throttle input.

I've yet to see if there's any improvement in MPG and I'm going to reset a couple of other adaptations such as MAF and MAP to ensure everything is in sync.

In summary; this is well worth a go to minimise exhaust gas recirculation and improved driveability.

Interesting - I have a M57 325d (no swirl flaps) but I did have an intermittent surge issue. It went to the dealers and they discovered loose bolts on the fuel rail

Not noticed any re-occurance of the surge yet - but I will monitor.

My car is a low mileage example - only 39k miles over 6.5 years, and I think under the previous owner it probably had done lots of shorter journeys - I wonder what the valves will be like - is there much coking on yours?

[Len_Beach]

Originally Posted by R99

Interesting - I have a M57 325d (no swirl flaps) but I did have an intermittent surge issue. It went to the dealers and they discovered loose bolts on the fuel rail

Not noticed any re-occurance of the surge yet - but I will monitor.

My car is a low mileage example - only 39k miles over 6.5 years, and I think under the previous owner it probably had done lots of shorter journeys - I wonder what the valves will be like - is there much coking on yours?

Mine is on 78k. I haven't seen the valves yet but I cleaned my MAP sensor about 6 months ago and it was in a terrible state and fully blocked.

The manifold I have bought came from a car of similar miles to mine and it has up to 1/2 an inch of oily crap at points inside the manifold. It's almost clean after 3 days of soak and jet washing.

That's not to say mine will look the same but I don't see why it would be any different.

[JJ0063]

My 325D is on 176k almost, I don't dare look lol

[E60525d]

Originally Posted by Len_Beach

I've just bought a replacement inlet manifold for my N57 330d to remove the swirl flaps and I have booked in for a walnut blast.

This got me thinking about the EGR as it was left active after my remap.

I did some playing with Rheingold and adjusted the EGR to the maximum fresh air value of 0.7.

The effect is that the throttle response is much more linear. When cruising then accelerating hard; there used to be a hesitation like turbo lag then a surge in power. Since making the adjustment; the throttle reacts to inputs much more progressively.

Low speed cruising definitely takes less throttle input.

I've yet to see if there's any improvement in MPG and I'm going to reset a couple of other adaptations such as MAF and MAP to ensure everything is in sync.

In summary; this is well worth a go to minimise exhaust gas recirculation and improved driveability.

Sounds good, do you have a brief summary on how to do this?

Also I took my EGR off to clean it and was surprised on how clean it was, there was just a light coating of soot. This was around 90k on my N57 330d.

[Len_Beach]

Originally Posted by E60525d

Sounds good, do you have a brief summary on how to do this?

Also I took my EGR off to clean it and was surprised on how clean it was, there was just a light coating of soot. This was around 90k on my N57 330d.

I did the same and my EGR was also surprisingly clean.

I was surprised how clogged the MAP sensor was though.

I've just booked my inlet clean so I'll ask him to take some pictures of the inlet valves.

To adjust the EGR value; from memory it's "Vehicle management", "Service actions" then "Adjustments" then the EGR is under there.

[E60525d]

Thats good to know, whereabouts is the MAP sensor located?

[elbutio]

Out of interest how are you looking to remove the swirl flaps in the n57 manifold? Are you having them removed from the map as I believe it will throw plausability errors? Very interested in this. Cheers

[elbutio]

Map sensor is on top of inlet manifold, v easy to remove

[Len_Beach]

Originally Posted by E60525d

Thats good to know, whereabouts is the MAP sensor located?

With the engine cover off; the inlet manifold is the shape of a "J" laid on its front. The MAP sensor is is at the top of the "J", nearest to you on the top edge of the manifold held in by a 10mm bolt.

I soaked mine in electrical contact cleaner that I also used on the MAF to not leave any residue.

On cleaning the MAF, MAP and resetting MAF adaptions I gained around 4 MPG.

[Len_Beach]

Originally Posted by elbutio

Out of interest how are you looking to remove the swirl flaps in the n57 manifold? Are you having them removed from the map as I believe it will throw plausability errors? Very interested in this. Cheers

The swirl flaps on the N57 are located on a dowel running the length of the manifold.

The dowel and the flaps have been removed and the actuator refitted.

The actuator will function as normal as if the flaps were in place so there shouldn't be any errors.

I had a plausibility error a few months ago before resetting adaptions. Plausibility errors are usually caused by carbon build up as the swirl flaps clog and don't fully open/close.

[Len_Beach]

This is the manifold I bought on eBay and you can see particularly in the first two ports how clogged they are. This would likely lead to plausibility errors.

[Wallace330d]

You guys have me worried about my inlet now....

How did you remove the egr valve? I attempted to split mine and it didn't want to budge! That was leaving the cooler in place and just talking the actual valve off.

[Len_Beach]

Originally Posted by Wallace330d

You guys have me worried about my inlet now....

How did you remove the egr valve? I attempted to split mine and it didn't want to budge! That was leaving the cooler in place and just talking the actual valve off.

I had the same issue. I managed to crack the bolts and pull the EGR out far enough to realise it was that caked up.

[Wallace330d]

I had the bolts out and a pry bar on the valve body but it just wouldn't pull out, I could rotate though. Was worried there was something else holding it but if it's just the carbon build up I'll give it another go.

[Len_Beach]

Originally Posted by Wallace330d

I had the bolts out and a pry bar on the valve body but it just wouldn't pull out, I could rotate though. Was worried there was something else holding it but if it's just the carbon build up I'll give it another go.

It's the coolant pipes that hold it in place. I managed to move these enough to pry the valve out.

[tadaska]

I cleaned my EGR valve recently and it made a big difference to my car's throttle response. Before I bought this 320D I also had a diesel car with a 1.7TD engine. I mostly drove it at bellow 2k RPM. Always in low RPM and when I want more speed I'd give it some gentle throttle and it would gently excelerate forward. Good fuel economy. So when I bought the BMW I wanted to drive it the same way but could't despite the bigger engine. I would keep it at low RPM and when I give it some gentle throttle it wouldn't respond like my previous car did. So I found myself keeping it at above 2k RPM where there was throttle response. But after I cleaned the EGR it all changed right away I was able to drive it in low RPM and have nice throttle response just like with my previous car.

[Len_Beach]

Originally Posted by tadaska

I cleaned my EGR valve recently and it made a big difference to my car's throttle response. Before I bought this 320D I also had a diesel car with a 1.7TD engine. I mostly drove it at bellow 2k RPM. Always in low RPM and when I want more speed I'd give it some gentle throttle and it would gently excelerate forward. Good fuel economy. So when I bought the BMW I wanted to drive it the same way but could't despite the bigger engine. I would keep it at low RPM and when I give it some gentle throttle it wouldn't respond like my previous car did. So I found myself keeping it at above 2k RPM where there was throttle response. But after I cleaned the EGR it all changed right away I was able to drive it in low RPM and have nice throttle response just like with my previous car.

You're probably experiencing a similar effect to me after I adjusted the EGR value.

The EGR will essentially provide a proportion of the metered air entering the inlet. A clogged EGR will prohibit the volume of metered air so despite there being less crap being forced back into the inlet; the car won't run as well as it's getting less air than is required.