discussion High Flow Catted Downpipe install on 2019 m240i

[temashan]

Hi Gents

New here and looking for some advice on the below points for my 2019 m240i stock( only M-performance back box ) any pointers and tips of advice will be appreciated :

1. Looking to install a high flow catted downpipe (themodsshop ) have in stock its quite pricey @ R11k

with regards to the above do i have to do a stage 2 tune ? if so between MHD and Bootmod any preferred 1 ?

if i go the MHD route do i need a tuner to do the tuning ie (dyno and road testing ) or do the OTS files pre-configured are already tested and safe to apply via WiFI adapter ?

anyone currently have the same setup on their car ? i am in DURBAN and looking to have a downpipe done after hearing how a high quality downpipe can improve performance and fuel efficiency without any drastic modifications that can potentially do more harm than good

so i guess my question is installing a highflow DP a safe and reliable mod

Thanks in advance i look forward to hearing from the guys on here with first hand experience on this topic

 

[Xcede Performance]

Hi,

Is there any reason you opting for a catted downpipe as opposed to a cat less? The main objective of the downpipe is to enable the exhaust gasses to escape without restriction and keep the EGT's low. We don't have emissions testing in here so kind of pointless to go for a catted downpipe.

The achilees heal of the Gen 1 B58 is the HPFP. Having done a few hundred of these I'd suggest upgrading the pump to the TU/Gen 2 pump for long term reliability and peace of mind.

The gearboxes on these are also only rated for 510nm, so the XHP Gearbox flash is highly recommended.

Spark plugs are also an important component when modding, it's recommended to upgrade to the Two step colder plugs and check the coil packs while you at it to avoid any necessary misfires.

With regards to tuning, MHD is a great tuning suite, we tune a lot of these remotely in the world via MHD. Whether to opt to run the OTS map or to go for a custom map its always advisable to dyno and datalog the car and have someone knowledgeable check it out. The OTS map are generic and no two cars are the same.

If you take short cuts and do things the wrong way it's very easy to crack a piston on a B58.

Drop me a PM to chat further, we've been tuning this platform since 2017.


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[temashan]

Hi,

Is there any reason you opting for a catted downpipe as opposed to a cat less? The main objective of the downpipe is to enable the exhaust gasses to escape without restriction and keep the EGT's low. We don't have emissions testing in here so kind of pointless to go for a catted downpipe.

The achilees heal of the Gen 1 B58 is the HPFP. Having done a few hundred of these I'd suggest upgrading the pump to the TU/Gen 2 pump for long term reliability and peace of mind.

The gearboxes on these are also only rated for 510nm, so the XHP Gearbox flash is highly recommended.

Spark plugs are also an important component when modding, it's recommended to upgrade to the Two step colder plugs and check the coil packs while you at it to avoid any necessary misfires.

With regards to tuning, MHD is a great tuning suite, we tune a lot of these remotely in the world via MHD. Whether to opt to run the OTS map or to go for a custom map its always advisable to dyno and datalog the car and have someone knowledgeable check it out. The OTS map are generic and no two cars are the same.

If you take short cuts and do things the wrong way it's very easy to crack a piston on a B58.

Drop me a PM to chat further, we've been tuning this platform since 2017.


Sent from my iPhone using Tapatalk

Hi,

Is there any reason you opting for a catted downpipe as opposed to a cat less? The main objective of the downpipe is to enable the exhaust gasses to escape without restriction and keep the EGT's low. We don't have emissions testing in here so kind of pointless to go for a catted downpipe.

The achilees heal of the Gen 1 B58 is the HPFP. Having done a few hundred of these I'd suggest upgrading the pump to the TU/Gen 2 pump for long term reliability and peace of mind.

The gearboxes on these are also only rated for 510nm, so the XHP Gearbox flash is highly recommended.

Spark plugs are also an important component when modding, it's recommended to upgrade to the Two step colder plugs and check the coil packs while you at it to avoid any necessary misfires.

With regards to tuning, MHD is a great tuning suite, we tune a lot of these remotely in the world via MHD. Whether to opt to run the OTS map or to go for a custom map its always advisable to dyno and datalog the car and have someone knowledgeable check it out. The OTS map are generic and no two cars are the same.

If you take short cuts and do things the wrong way it's very easy to crack a piston on a B58.

Drop me a PM to chat further, we've been tuning this platform since 2017.


Sent from my iPhone using Tapatalk

Hi,

Is there any reason you opting for a catted downpipe as opposed to a cat less? The main objective of the downpipe is to enable the exhaust gasses to escape without restriction and keep the EGT's low. We don't have emissions testing in here so kind of pointless to go for a catted downpipe.

The achilees heal of the Gen 1 B58 is the HPFP. Having done a few hundred of these I'd suggest upgrading the pump to the TU/Gen 2 pump for long term reliability and peace of mind.

The gearboxes on these are also only rated for 510nm, so the XHP Gearbox flash is highly recommended.

Spark plugs are also an important component when modding, it's recommended to upgrade to the Two step colder plugs and check the coil packs while you at it to avoid any necessary misfires.

With regards to tuning, MHD is a great tuning suite, we tune a lot of these remotely in the world via MHD. Whether to opt to run the OTS map or to go for a custom map its always advisable to dyno and datalog the car and have someone knowledgeable check it out. The OTS map are generic and no two cars are the same.

If you take short cuts and do things the wrong way it's very easy to crack a piston on a B58.

Drop me a PM to chat further, we've been tuning this platform since 2017.


Sent from my iPhone using Tapatalk

Hi thank you for your reply 🙏🏻, not sure how you pm on here this is the first time I’ve done a thread 🫠… is it possible to tune just for the DP ? I was leaning towards catted as I read decatted would throw CEL’s and I don’t want to install cat foolers or any additional hardware my intention is to keep the car as close to stock as possible but just to have it sound a little more deeper and raspier and hopefully get it to breathe better and be more fuel efficient even if it’s slightly more lighter

 

[Xcede Performance]

Hi thank you for your reply , not sure how you pm on here this is the first time I’ve done a thread 🫠… is it possible to tune just for the DP ? I was leaning towards catted as I read decatted would throw CEL’s and I don’t want to install cat foolers or any additional hardware my intention is to keep the car as close to stock as possible but just to have it sound a little more deeper and raspier and hopefully get it to breathe better and be more fuel efficient even if it’s slightly more lighter

Drop me an email on [email protected]


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[AudiDriver]

I had MHD on my S55 for some time. Decided to remove the cats, replaces with resonated downpipes (ARM) and resonators in place of secondary cats. I didn’t want any rasp - for me personally that is the least OEM sound you can get and if you are going for that then add a flash and have the performance to go with the sound.

My default maps is Stage 0+ (CS) as I don’t like the aggressive mid range punch of the stage 1 and 2 maps, which do not feel OEM. I haven’t even tested the car with stage 1 or stage 2 since I deletes the cats.

MHD, Bootmod, etc. will not throw CEL.

You are in good hands with Xcede - make sure you know what you want.


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[temashan]

I had MHD on my S55 for some time. Decided to remove the cats, replaces with resonated downpipes (ARM) and resonators in place of secondary cats. I didn’t want any rasp - for me personally that is the least OEM sound you can get and if you are going for that then add a flash and have the performance to go with the sound.

My default maps is Stage 0+ (CS) as I don’t like the aggressive mid range punch of the stage 1 and 2 maps, which do not feel OEM. I haven’t even tested the car with stage 1 or stage 2 since I deletes the cats.

MHD, Bootmod, etc. will not throw CEL.

You are in good hands with Xcede - make sure you know what you want.


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Thank you bud 🙂 yeah I’m leaning towards excede and will make contact with them in the coming weeks once I’m ready to pull the trigger

 

[Xcede Performance]

As luck would have it we had a walk in customer today with an M240i running a catless downpipe and Stage 2 MHD 95ron OTS Map.

The car is pulling excsssive timing with the MHD OTS map and makes less power than a stock B58.

A stock B58 makes 240kw & 500+nm on the wheels up here on our dyno.

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[AudiDriver]

It would be interesting for the nerds (I include myself) to know what the issues were with this car - may be helpful to others in terms of preventive maintenance and symptoms to look out for.

I don’t trust our local fuel - 10% ethanol goes into every tank. And regular oil changes (6 months / 6000km, whichever comes first) as the basics to extend engine life and maintain performance for longer. These are by no means enough, but it is a good start IMO.


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[Salt]

As luck would have it we had a walk in customer today with an M240i running a catless downpipe and Stage 2 MHD 95ron OTS Map.

The car is pulling excsssive timing with the MHD OTS map and makes less power than a stock B58.

A stock B58 makes 240kw & 500+nm on the wheels up here on our dyno.





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Interesting this...I've spent quite a bit of time the past two weeks considering options for my car going forward. I understand that 91 octane = 95 ron. So essentially without ethanol we need to use 91 octane maps. I'd like to get the tu pump fitted and go stage 2+. Currently on Bootmod3 stage 2 91 map. I see the stage 2+ multimap has a 91 map slot. However interesting to see you mention that even running a 91 Octane map (95 ron) on stage 2 causes too many timing corrections. I think I need to figure out how to run some logs and see what mine looks like now on stage 2. If I also have excessive timing corrections I guess I'll have to start adding 5l or so ethanol regardless of whether I'm staying on stage 2 or going 2+. Good info thank you! May I ask if you changed anything on this car to correct the timing issues or simply advised to add ethanol going forward?

 

[Xcede Performance]

Interesting this...I've spent quite a bit of time the past two weeks considering options for my car going forward. I understand that 91 octane = 95 ron. So essentially without ethanol we need to use 91 octane maps. I'd like to get the tu pump fitted and go stage 2+. Currently on Bootmod3 stage 2 91 map. I see the stage 2+ multimap has a 91 map slot. However interesting to see you mention that even running a 91 Octane map (95 ron) on stage 2 causes too many timing corrections. I think I need to figure out how to run some logs and see what mine looks like now on stage 2. If I also have excessive timing corrections I guess I'll have to start adding 5l or so ethanol regardless of whether I'm staying on stage 2 or going 2+. Good info thank you! May I ask if you changed anything on this car to correct the timing issues or simply advised to add ethanol going forward?

Hi,

It's always a good idea to log especially on a B58 as they are prone to cracking pistons.

The owner flashed to stock and will be coming in for a custom tune.

We have plenty of these running our mild 95 map with no issues.


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[AudiDriver]

I took some logs after going from stage 0+ CS to stage 1 recently. STFT and LTFT look good. Timing correction is zero under load (there is always one or two cylinders with a little correction as boost builds or sometimes when throttle closes, but that is normal). Boost peak is about 21 psi / 1.45 bar. Lambda values are within range also.

I increased eth to 20% to see if it makes any difference - I don’t feel any benefit going from say 10-15% to a 20% mix on stage 1 - the base map doesn’t compensate enough for 20% ethanol on cold start and even if I leave cold start active, there is slight uneven idle now and then for first minute until the engine warms up - no misfires, just a hesitation as the base map only enriches the fuel mixture on cold start for about 10% eth and it’s not rich enough for smooth idle on 20% - a custom tune would be needed for that and I don’t have any plans to run 30% ethanol and use the E30 tune provided under the OTS maps. My way forward is to stay on about 10% ethanol each tank and I’m happy with stage 1 95 RON map - the car is strong and responsive and power delivery is smooth.

I would never run any off the shelf OTS map for 95 RON on pump fuel only, but that’s me.

I know this is not an apples for apples comparison, S55 vs B58, but as Xcede advised if you want to change maps, always log and study the data to make sure every parameter stays within limits to ensure reliability. It is important to repeat logging on a hot day to observe the data for the worst case scenario, rather than relying on data collected on a 20 degree C ambient day. I’ll repeat logging soon on a hot day to check for issues. I also won’t run stage 2 as I don’t like pushing things too hard - better to be a bit conservative and ensure longevity of these expensive cars and avoid issues later.

Phew, cracked pistons, now that is something that would give me sleepless nights.


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