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#281 ·
razorzz said:
A45S reg: ***70AMG

Same problem: Screw in front n'side tyre on a Friday at 1900 miles : No spare and local Merc dealer had no 19" pilotsports my size in stock so recovery truck and 3 days off road for repair. Upside: Merc dealer arranged FREE courtesy car for 3 days through Europcar:

ECU upgrade issue: tempting but don't, at least not until warranty expires. Mercedes WILL invalidate engine warranty if you get problems: Emailed Mercedes UK Milton Keynes and their line is that an ECU upgrade fundamentally changes engine dynamics and therefore they will not be held responsible if ANY part of engine itself malfunctions. PERIOD. You could argue your case in court against them but you would lose.. Is it worth risking a £57k + car for just a few extra horses which in all probability you will hardly ever be able to use to its full extent. After 3 years.. do what you like...
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The puncture is just such a pain. Glad it's sorted.

The Brabus tune I had on my original A45 came as a separate module and MB didn't even question it when they had to replace the turbo. I had to point it out to them as I didn't want the box to be disconnected by accident. So a separate box is probably worth considering.
 
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Discussion starter · #282 ·
Anyone know how to disconnect the wire to the exhaust valve? I want to see how the exhaust sounds when revving at idle with the valve open. Currently its coded to shut as soon as you begin to rev the car so it sounds pance when you rev the car.
 
Discussion starter · #287 ·
sr3rad said:
That's a good question, I disconnected mine when the engine was off. Does it default to closed when the engine is off?
p.s don't forget to put rubber cover on connector to keep out the muck.
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No idea but I assume it stays in whatever position it is in when you disconnect the control connector.
 
#288 ·
VerniQR said:
Gentlemen, I'm fresh after installing the CatBack exhaust from MG MotorSport (A45S).
It gets better but this is not it. I read the whole topic from the first page and I don't know anymore. Of course, I want to keep the guarantee.
Does anyone know about a new method that will leave a warranty and at the same time increase the volume of the exhaust without errors in the ECU?
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Any drone effect?
 
#289 · (Edited)
Got the Akra on today, sourced and fitted (for free) by Ricky at RE Performance in Swindon. Top work by the guys as they'd not done a W177 Akra fit yet. The back box came with its own valve controller in situ but this then connects to another Akra control unit which takes a feed off the TCU which is also where the "artificial" bits get processed.

Sounds louder and bassier at idle with a bit more howl under load. Probably enough for me, I'd only add the downpipe if there was a decent performance lift but that seems to be not the case as per @changchewsoon

Its claimed to make another 8.5 HP so will see if it improves on my DTUK Map1 100 - 200 kmh time next time I get near an airstrip :)

8700
 
#290 ·
nn7man said:
Got the Akra on today, sourced and fitted (for free) by Ricky at RE Performance in Swindon. Top work by the guys as they'd not done a W177 Akra fit yet. The back box came with its own valve controller in situ but this then connects to another Akra control unit which takes a feed off the TCU which is also where the "artificial" bits get processed.

Sounds louder and bassier at idle with a bit more howl under load. Probably enough for me, I'd only add the downpipe if there was a decent performance lift but that seems to be not the case as per @changchewsoon

Its claimed to make another 8.5 HP so will see if it improves on my DTUK Map1 100 - 200 kmh time next time I get near an airstrip :)

View attachment 8700
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Sounds great! Please share more pics if you have.
 
#291 · (Edited)
Maybe you read my post wrongly, I was saying that the dyno wasn't able to pick up any gains with the Akrapovic catback or the Armaspeed intake installed. I wasn't able to install the downpipe that time because the unit sent by Akrapovic didn't fit my car due to missing 2 bung holes for the extra sensors for post 2020 cars.

Akrapovic has then sent me the revised downpipe later and I have gotten it installed, but I wasn't able to get it tuned because of the pandemic lockdown in my country whereby the government only allowed the shops to operate until 6 pm.

I was late in sending in the car, and they had to wait for a while to let the downpipe cool down before removing it. The stock downpipe was really a pain to remove, and it took them much longer than expected. By the time we finished installing the downpipe, it was almost 6 pm so I only had the car on the dyno to do a pull with the same map to see the difference and I headed home.

Due to the time zone difference my tuner is 12 hours behind me, and in the past, I would book the dyno 8 pm/9pm my local time so that my tuner can remote tune the car which is 8am/9am his time. But now since the shops aren't able to operate past 6 pm, I'm waiting for a suitable time to put the car on the dyno again to tune it, most probably after our government has lifted the restrictions on operating hours.

With the downpipe installed, we could see that the turbo spools up much earlier and we gained some noticeable torque with the same current map I'm running before.

Hope this helps you in making an informed decision whether you would consider going with a downpipe in the future.

Also attached a picture of the stock downpipe vs the Akrapovic downpipe. My car is non-OPF version by the way.
8715

8716
 
#294 · (Edited)

A friend's car underwent a remap with M3P, I was there and took a video.

The car has Tneer 200 cell downpipe, Akrapovic catback.

Low rpm burbles, mid rpm and above combination of crackles, pops & bang.

The car sounded really pissed.
 
#295 · (Edited)
Hello, I am about to buy a decatted miltek downpipe but it states it’s only for vechiles without additional sensors?

this is what I want:

https://www.milltekexhaust-roadrunn...rbo-w177-hatch-only-particulate-filter-back-exhaust-non-resonated-ssxmz153.html

and then the downpipe


I have a 2021 A45s and I’m from the UK. Will these two fit on my car?

can anyone give me any advice? Thanks
 
#296 · (Edited)
AMG00 said:
Hello, I am about to buy a decatted miltek downpipe but it states it’s only for vechiles without additional sensors?

this is what I want:

https://www.milltekexhaust-roadrunn...rbo-w177-hatch-only-particulate-filter-back-exhaust-non-resonated-ssxmz153.html

and then the downpipe


I have a 2021 A45s and I’m from the UK. Will these two fit on my car?

can anyone give me any advice? Thanks
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You'll first need to determine whether your car's downpipe is running on a pair of sensors or 2 pair of sensors. The easiest way is to look at the engine bay and see whether you can see there 1 sensor or 2 sensors at the downpipe.

If it has 2 sensors, then the Miltek downpipe will not be suitable for your car. If it has one, you can use it.

Secondly, you will need to determine whether your car is the GPF or non-GPF version. If it is GPF, you'll need a ECU remap to go with it or else the car will have a check light and the power will be restricted as a safety measure by the ECU.

As far as I know, UK models are fitted with GPF.

I've attached 2 pictures below, one with only 1 sensor attached and the other is with 2 sensors on the downpipe so you can get a visual idea of what I'm talking about.

Image
Image
 
#298 ·
changchewsoon said:
You'll first need to determine whether your car's downpipe is running on a pair of sensors or 2 pair of sensors. The easiest way is to look at the engine bay and see whether you can see there 1 sensor or 2 sensors at the downpipe.

If it has 2 sensors, then the Miltek downpipe will not be suitable for your car. If it has one, you can use it.

Secondly, you will need to determine whether your car is the GPF or non-GPF version. If it is GPF, you'll need a ECU remap to go with it or else the car will have a check light and the power will be restricted as a safety measure by the ECU.

As far as I know, UK models are fitted with GPF.

I've attached 2 pictures below, one with only 1 sensor attached and the other is with 2 sensors on the downpipe so you can get a visual idea of what I'm talking about.

View attachment 8793 View attachment 8794
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Thanks for the detailed reply. I can confirm mine is the second pic,

I’m wondering if there’s anyway of getting around this..
Image
 
#299 ·
changchewsoon said:
You'll first need to determine whether your car's downpipe is running on a pair of sensors or 2 pair of sensors. The easiest way is to look at the engine bay and see whether you can see there 1 sensor or 2 sensors at the downpipe.

If it has 2 sensors, then the Miltek downpipe will not be suitable for your car. If it has one, you can use it.

Secondly, you will need to determine whether your car is the GPF or non-GPF version. If it is GPF, you'll need a ECU remap to go with it or else the car will have a check light and the power will be restricted as a safety measure by the ECU.

As far as I know, UK models are fitted with GPF.

I've attached 2 pictures below, one with only 1 sensor attached and the other is with 2 sensors on the downpipe so you can get a visual idea of what I'm talking about.

View attachment 8793 View attachment 8794
Click to expand...
The Power is not affected if you remove the GPF and leave the ECU standard. You may however get the check engine light come on and off intermittently, but the power is not affected.
 
#300 ·
joni said:
The Power is not affected if you remove the GPF and leave the ECU standard. You may however get the check engine light come on and off intermittently, but the power is not affected.
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Unfortunately our cars in this part of the world doesn't come with the GPF, so I won't be able to confirm that.

I only know if the check light is turned on and you notice some features like the burbles on downshift is gone, the power is definitely reduced as the ECU will be running on diagnostic maps and those maps are conservative and meant to allow the car to be able to be driven without making a lot of power and any other features will not be available.
 
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