E82 120d Downpipe etc

Tielman

Tielman

Member
Morning Guys,

I'm still new to BMW, diesel and the forum so apologies if this has been asked a million times.

First things first, are there any 1 series or BMW car clubs in Cape Town? And who are the main guys to go to for BMW specific mods? Rennzport has came up alot when asking around.

Everyone is telling me to get a downpipe fitted, so I would like some info as to what this actually is. The second thing everyone is talking about is getting a decat. And finally then to do the software.

My biggest concerns is if this will throw any error codes and if there is any long term damage?

Finally, I've seen a few modified diesels blowing out silly amounts of soot, at what stage during the mods does the crazy smoking start?

Sorry for the long post!

Thanks
 
Schalk94

Schalk94

Well-known member
Tielman said:
Morning Guys,

I'm still new to BMW, diesel and the forum so apologies if this has been asked a million times.

First things first, are there any 1 series or BMW car clubs in Cape Town? And who are the main guys to go to for BMW specific mods? Rennzport has came up alot when asking around.

Everyone is telling me to get a downpipe fitted, so I would like some info as to what this actually is. The second thing everyone is talking about is getting a decat. And finally then to do the software.

My biggest concerns is if this will throw any error codes and if there is any long term damage?

Finally, I've seen a few modified diesels blowing out silly amounts of soot, at what stage during the mods does the crazy smoking start?

Sorry for the long post!

Thanks
Click to expand...


A downpipe is basically the section of the exhaust that runs down from the turbo to the exhaust itself. When doing a downpipe,the cat/dpf is removed and the flow of gasses happens more freely,so exhaust temperatures run cooler and you will gain a bit of torque and throttle response.

If I am not mistaken,your car doesn't have a sensor that needs to be "fooled" in the cat,so no errors or anything should appear when fitting a downpipe.

The huge amounts of soot from diesels is usually a result of quite aggresive tunes via software,so with a "mild" map and downpipe you should not really see much smoke. But the smoke is worth it when the car pulls as well as a mapped 20d does.
 
Kashvir

Kashvir

Active member
When I fitted my downpipe no error codes were thrown. performance wise the throttle response was slightly better. I haven't had any issues with it to report on my side.

I have an RK tune on my car as well. There is a puff of smoke that comes out when dropping a gear. The only heavy smoke I have noticed is when I downshift and my foot is flat on the accelerator.

From my experience I would definitely recommend fitting a downpipe and getting a custom tune.
 
Schalk94

Schalk94

Well-known member
Tielman said:
Correct me if im wrong, is fitting a downpipe the same as decatting the car?
Click to expand...

It is loosely the same idea as a decat.A downpipe basically removes the cat by replacing the whole section with a larger diameter "pipe" with better bends that result in a better flow.
 
Tielman

Tielman

Member
Okay thanks for all replies so far.

My next question, I know a diesel has no point in installing a BOV, but does a downpipe amplify that woosh sound you sometimes get between gears on a diesel? The little boy in me likes turbo noises:smilebounce:
 
Schalk94

Schalk94

Well-known member
Tielman said:
Okay thanks for all replies so far.

My next question, I know a diesel has no point in installing a BOV, but does a downpipe amplify that woosh sound you sometimes get between gears on a diesel? The little boy in me likes turbo noises:smilebounce:
Click to expand...


The dowpipe will definitely give you a much clearer spooling sound,you will definitely hear it a lot more. If you want even more of a turbo spool sound,removing one of your exhaust boxes would do the trick.
 
FerdiBotha

FerdiBotha

Well-known member
Tielman said:
Okay thanks for all replies so far.

My next question, I know a diesel has no point in installing a BOV, but does a downpipe amplify that woosh sound you sometimes get between gears on a diesel? The little boy in me likes turbo noises:smilebounce:
Click to expand...

On my 330d I removed the middle silencer box and fitted a 76mm downpipe. The sound changed quite a bit and the turbo can be heard clearly.

Obviously a 6-pot sounds completely different than a 4-pot, but here’s an idea of what my car sounds like -
 
Tielman

Tielman

Member
I spoke to Profit Exhaust in Cape Town to get a downpipe fitted, so that will be the first mod.

Is there any other guys in CPT that I can call regarding a downpipe?
Rennzport unfortunately does not have anything for my vehicle, apart form the 1M bumpers.
 
C

CTR

Member
I have also heard of guys fitting a bigger intercooler. Is there any major difference in performance noticed?

What sort of power are you making with current mods you have on your car?

Kashvir said:
When I fitted my downpipe no error codes were thrown. performance wise the throttle response was slightly better. I haven't had any issues with it to report on my side.

I have an RK tune on my car as well. There is a puff of smoke that comes out when dropping a gear. The only heavy smoke I have noticed is when I downshift and my foot is flat on the accelerator.

From my experience I would definitely recommend fitting a downpipe and getting a custom tune.
Click to expand...
 
Kashvir

Kashvir

Active member
CTR said:
I have also heard of guys fitting a bigger intercooler. Is there any major difference in performance noticed?

What sort of power are you making with current mods you have on your car?
Click to expand...


I don't know about the bigger intercooler, personally i would put water meth before a bigger intercooler.
Currently I am running stock turbo, stock intercooler, pretty much a stock engine. only mods I have is a 76mm downpipe with a 63mm straight pipe exhaust with a silencer muffler back box.
The last time I had my car on the dyno I pushed 145kw and 495nm at the wheel
 
Twinz

Twinz

Forum - Support
Staff member
Performance wise...i would just get the latest Racechip tune and keep the rest of the 120d stock.

A few cosmetic stuff here and there but you not gonna churn much out of this motor unless you prepared to spend on a bigger turbo. For bigger power a 330d will be best suited.
 
FerdiBotha

FerdiBotha

Well-known member
If you plan on keeping the car a while I’d go for a custom map over any plug and play chip.

I won’t venture into comparing individual tuners or plug and play companies, but a custom map will always outperform a chip as it is written for your specific car instead of a generic map for all cars of the same model.

Just my 2c.:thumbs:
 
C

CTR

Member
Kashvir said:
CTR said:
I have also heard of guys fitting a bigger intercooler. Is there any major difference in performance noticed?

What sort of power are you making with current mods you have on your car?
Click to expand...


I don't know about the bigger intercooler, personally i would put water meth before a bigger intercooler.
Currently I am running stock turbo, stock intercooler, pretty much a stock engine. only mods I have is a 76mm downpipe with a 63mm straight pipe exhaust with a silencer muffler back box.
The last time I had my car on the dyno I pushed 145kw and 495nm at the wheel
Click to expand...


Wow that's really impressive
 
Cornel

Cornel

///Member
FerdiBotha said:
I’d be keen to see figures of the new generation RaceChip and see how it has progressed :thumbs:
Click to expand...
keen to see as well. we had one on the toyota and they ......

Kashvir said:
CTR said:
I have also heard of guys fitting a bigger intercooler. Is there any major difference in performance noticed?

What sort of power are you making with current mods you have on your car?
Click to expand...


I don't know about the bigger intercooler, personally i would put water meth before a bigger intercooler.
Currently I am running stock turbo, stock intercooler, pretty much a stock engine. only mods I have is a 76mm downpipe with a 63mm straight pipe exhaust with a silencer muffler back box.
The last time I had my car on the dyno I pushed 145kw and 495nm at the wheel
Click to expand...


lekker buddy that's moer strong
 
C

CTR

Member
Tielman said:
I spoke to Profit Exhaust in Cape Town to get a downpipe fitted, so that will be the first mod.

Is there any other guys in CPT that I can call regarding a downpipe?
Rennzport unfortunately does not have anything for my vehicle, apart form the 1M bumpers.
Click to expand...

Did you manage to get the downpipe fitted? Are you also doing software at the same time? or just a downpipe for now?
 
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