E46 330i Decat

[moranor@axis]

The strange thing is that a supposedly reputable company like Van Der Linde did the exactly same thing on the mainfold cats like Bavs car on Sankukuers 330.

it is the easy way to make sure pipes are not miss aligned this is the only possible reason why they would do it this way...
ask any engineer if this void would be good for flow and he will tell you no...

reason why the diameter is so big around the cat is to compensate for the volume taken up by the cat with it removed it is too big...

Something else I thought about, those "oil drums" in the engine bay, hollowed out or not, must be generating (and storing) some extreme unneeded heat under the hood of the car?

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@ Moranor, do you have branches (headers) that are a straight bolt-on replacement for the manifolds and cats on the 320i E46? After this morning I want to rip the things out and drive over them!

Viper branch bolts onto head and comes with flanges... they are longer though so you need to cut the stock system a little and weld the new flanges on...

other option is to fit the Viper branch with two new pipes till after the secondary cats...

I also have a custom resonator box to replace the cats with a built in X pipe

So someone who is handy with a TIG welder and an angle grinder will be able to fit the Viper branch? Will he then only have to cut out the secondary cats and fit straight pipes?

correct

If you such a person I can also provide you with Mandrel bends and pipe to increase the front section Demeter :rollsmile:

Nope, I am talking about an oldish man here in town, who I am always taking my cars to, who really knows his way around exhausts, he will most probably know how to install the pipes.

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in that case just make sure he uses mandrel bends I can provide the rest

 

[Sankekur]

The strange thing is that a supposedly reputable company like Van Der Linde did the exactly same thing on the mainfold cats like Bavs car on Sankukuers 330.

eh, no. They cut the cats off completely at the collectors.

 

[moranor@axis]

The strange thing is that a supposedly reputable company like Van Der Linde did the exactly same thing on the mainfold cats like Bavs car on Sankukuers 330.

eh, no. They cut the cats off completely at the collectors.

seemed a bit funny to me glad they did it the right way

 

[Yuben]

The strange thing is that a supposedly reputable company like Van Der Linde did the exactly same thing on the mainfold cats like Bavs car on Sankukuers 330.

eh, no. They cut the cats off completely at the collectors.

Apologies for seemingly misquoting you Sank. I was clearly under the impression from ur msgs previously that VDL hollowed out ur cats.

So to clear it up, did they replace the cats on the manifold with piping?
And u running boxes in place of the middle cats?
And VDL charges in the region of R8k?
:thumbs:

 

[Sankekur]

The strange thing is that a supposedly reputable company like Van Der Linde did the exactly same thing on the mainfold cats like Bavs car on Sankukuers 330.

eh, no. They cut the cats off completely at the collectors.

Apologies for seemingly misquoting you Sank. I was clearly under the impression from ur msgs previously that VDL hollowed out ur cats.

So to clear it up, did they replace the cats on the manifold with piping?
And u running boxes in place of the middle cats?
And VDL charges in the region of R8k?
:thumbs:

No apology needed, a simple misunderstanding.
Yes they replaced the cats in the manifolds with piping.

I actually have a x-pipe in the place of the middle cats (though I should say sort of as it might not be in exactly the same place as the cats where, as I changed the whole system)
I posted this pic of the x pipe in my showroom thread a while back:

When I did mine I paid R7k.....but I wouldn't be surprised if it is now closer to R8k (Their prices are usually excluding VAT....but I just paid cash....:mmm: )

 

[Bavs108]

Sank can you post a video or sound clip if possible? :rollsmile: I assume those X pipes are hollow in the center to allow the gasses to flow between the pipes? What impact would that have in terms of sound if I were to do something like that on mine?

 

[moranor@axis]

you can see this is a company that produces quality work... they even sleeved the welds... this ensures there is no welding penetration into the exhaust to affect flow...

 

[Divio]

@Bavs >>>>
http://www.bmwfanatics.co.za/showthread.php?tid=8493&page=26

The Legend known as Sankekur raise:

 

[Bavs108]

@Bavs >>>>
http://www.bmwfanatics.co.za/showthread.php?tid=8493&page=26

The Legend known as Sankekur raise:

Thanks Divs:ty: That's my reading material sorted for the weekend:rollsmile:

 

[individj]

think i should do this too...custom manifold & straight pipe..ive removed my backbox altogether on previous cars but i think it will be a bit much on the 330

 

[Sankekur]

Sank can you post a video or sound clip if possible? :rollsmile: I assume those X pipes are hollow in the center to allow the gasses to flow between the pipes? What impact would that have in terms of sound if I were to do something like that on mine?

I know on V8's the flow between the two pipes helps get rid of the off-beat "machine gun" noise of the exhaust.
On the I6's I am not entirely sure, it might get rid of the rasp, or might just make the exhaust not smoother....

you can see this is a company that produces quality work... they even sleeved the welds... this ensures there is no welding penetration into the exhaust to affect flow...

Indeed, they are pretty damn expensive, but I feel you get what you pay for in this case.

@Bavs >>>>
http://www.bmwfanatics.co.za/showthread.php?tid=8493&page=26

The Legend known as Sankekur raise:

Sir you flatter me :ty:

 

[GPGrobler]

The strange thing is that a supposedly reputable company like Van Der Linde did the exactly same thing on the mainfold cats like Bavs car on Sankukuers 330.

eh, no. They cut the cats off completely at the collectors.

Apologies for seemingly misquoting you Sank. I was clearly under the impression from ur msgs previously that VDL hollowed out ur cats.

So to clear it up, did they replace the cats on the manifold with piping?
And u running boxes in place of the middle cats?
And VDL charges in the region of R8k?
:thumbs:

No apology needed, a simple misunderstanding.
Yes they replaced the cats in the manifolds with piping.

I actually have a x-pipe in the place of the middle cats (though I should say sort of as it might not be in exactly the same place as the cats where, as I changed the whole system)
I posted this pic of the x pipe in my showroom thread a while back:

When I did mine I paid R7k.....but I wouldn't be surprised if it is now closer to R8k (Their prices are usually excluding VAT....but I just paid cash....:mmm: )

Is the R8k for a full replacement of the stock exhaust?

---

Just to confirm, the OE exhaust is stainless steel right?

 

[Sankekur]

Can't comment about the price as I do not know what it is nowadays, but yes this was for a full replacement exhaust and for the cats cut from the manifold.

Yup the original exhaust is stainless.

 

[Bavs108]

So today I was a bit curious to see some power figures so I took my car in for a dyno run:rollsmile: Sadly I was in a bit of a rush and got a bit distracted chatting to one of the tuners so I did not get any videos or pics:yuck: Here's the dyno sheet measured at the wheels. What do you guys think?

From what I understand, a stock 330i pushes out around 113-118kw on the wheels if not mistaken? So I assume this equates to a 15-18kw gain?

 

[GPGrobler]

I am curious, a 330i pushing out only 118kw standard? Is this possible, because a 12V 6 cylinder 24 years it's senior(BMW E30 325i) pushes out 125kw standard? Is the new 330i a 4-cylinder?

 

[Bavs108]

I am curious, a 330i pushing out only 118kw standard? Is this possible, because a 12V 6 cylinder 24 years it's senior(BMW E30 325i) pushes out 125kw standard? Is the new 330i a 4-cylinder?

It's measured at the wheels not at the flywheel where manufacturers like to quote from. At the wheels takes into account power lost through the drivetrain.

 

[Yuben]

So today I was a bit curious to see some power figures so I took my car in for a dyno run:rollsmile: Sadly I was in a bit of a rush and got a bit distracted chatting to one of the tuners so I did not get any videos or pics:yuck: Here's the dyno sheet measured at the wheels. What do you guys think?

From what I understand, a stock 330i pushes out around 113-118kw on the wheels if not mistaken? So I assume this equates to a 15-18kw gain?

Bavs I'm assuming this dyno run was at the coast?
If so, a stock 330 should be making around 141kw ATW.
up here it makes around 117kw ATW
Check out the link:thumbs:
http://www.bmwfanatics.co.za/showthread.php?tid=41

 

[Bavs108]

So today I was a bit curious to see some power figures so I took my car in for a dyno run:rollsmile: Sadly I was in a bit of a rush and got a bit distracted chatting to one of the tuners so I did not get any videos or pics:yuck: Here's the dyno sheet measured at the wheels. What do you guys think?

From what I understand, a stock 330i pushes out around 113-118kw on the wheels if not mistaken? So I assume this equates to a 15-18kw gain?

Bavs I'm assuming this dyno run was at the coast?
If so, a stock 330 should be making around 141kw ATW.
up here it makes around 117kw ATW
Check out the link:thumbs:
http://www.bmwfanatics.co.za/showthread.php?tid=41

Yup at the coast. Could it be the way the dyno is set up? They were saying stock 330i's run around 110-118wkw on that dyno. It's unfortunate that I didn't get it measured before the decat and unfortunately it's the only dyno in town so I can't really compare it against another:yuck:

 

[Yuben]

Eish that dyno seems too conservative :yuck:

 

[Prev]

Take the dyno reading with a pinch of salt. Interesting though that the graph flattens out around 4000rpm and then climbs again



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