[p47r1ck]

Hi guys!

This is my first post in here, so bear with me.


So - I've got a brand new 2019 BMW 120i with the B48 engine.. Really nice car, and it ran decent and pretty fast. But after 5000km mark, i wanted more.

So i used a scandinavian tuning company called BSR tuning for the tuning software - they delivered 284hp only from the computer. I was really impressed. They even give you a 2 year warranty on the engine, everything except the clutch. Which is kinda a warning in my head.

Furthermore i fitted the M140i M-Performance exhaust, plus the KN oem replacement air filter intake, and tomorrow i'm fitting the FTP Chargepipe V2 to replace the OEM plastic ones, so it hopefully can last longer and be more safe.


My question(one of a few) is - do any of you guys know if the gearbox and clutch can handle so much power? The gear changes from 0-40mph can be kinda rough. I'm kinda hoping someone says its the same clutch and gearbox which is in the m140

And does anyone know how much you can push the B48 engine, and the whole car for that matter, until it becomes unreliable in form of the engine maybe breaking? It's only got 9000km....




And can it really be that there is no upgrade intercooler system for the B48?
I've scouted the internet for weeks and can only find a Wagner Tuning Radiator that is kinda plug'n'play for the B48.


Any experiences at all with tuning and/or using upgrade/tuning parts for the B48?



Hope you'll welcome me! And thanks for your time.


//patrick

[Darkwave]

Originally Posted by p47r1ck

And can it really be that there is no upgrade intercooler system for the B48?
I've scouted the internet for weeks and can only find a Wagner Tuning Radiator that is kinda plug'n'play for the B48.


//patrick

That intercooler upgrade is for front wheel drive cars only, in RWD cars BMW uses a more complicated system on top of the engine (water cooled I believe).

Greats,

[Darkwave]

Originally Posted by Darkwave

That intercooler upgrade is for front wheel drive cars only, in RWD cars BMW uses a more complicated system on top of the engine (water cooled I believe).

Greats,

Ah, too soon... there's actually an intercooler upgrade for B48 engines in BMWs: https://www.wagner-tuning.uk/400001002.html

[p47r1ck]

Oh sweet!

They must've added that recently.

Do you know if it would make any Performance improvements?

[sege1985]

I have remaped my car with BM3 stage2 91 octane, almost 290Ps 450Nm, 0-100 5.89s with front 225 40 18 rear 255 35 18 ad08r, actually it's should be better

here is some experiences for you

if you wanna turning stage2, replace intercooler, turbo pipes, downpipe is necessary

but if stage1, downpipe is enough

attachment is original with stage1

[Dav1d]

I also have a BMW 120i B48 from May-2019. I have also thought about remapping the ECU. I reached out to a well-reputed tuning company in Denmark, asking for the expected output/performance after a remap with focus on reliability.
They gave me the answer, that I should expect 260-270 HP and 420-440nm of torque. Does anyone know how much torque the clutch and gearbox can handle? I guess there is a limit?

[ovekvam]

The torque seen by the clutch and gearbox is higher when you launch the car from a standing start than what the engine can apply to it.

[Dav1d]

Originally Posted by ovekvam

The torque seen by the clutch and gearbox is higher when you launch the car from a standing start than what the engine can apply to it.

Can you elaborate please?

[ovekvam]

Originally Posted by Dav1d

Can you elaborate please?

The torque in the clutch and gearbox depends on what is connected to both sides. In one end, we have the engine. It can produce a certain maximum torque. In the other end, we have our tires. If they are not on the ground, the engine can not build up much torque in the clutch or the gearbox. There is not enough resistance.

On the other hand, if you have a 116i-engine revved up to 6000 RPM (not producing much torque, just revving high), and dump the clutch with grippy tires, you will get a high torque peak in the clutch and gearbox.

If you try the same with a higher gear, it gets even worse. The ultimate test of the clucth for slip, is to test driving in sixth gear. Clutch in, rev up, and dump the clutch. The creates a huge torque peak. A lot more than the engine can produce by flooring the throttle.

[Dav1d]

Originally Posted by ovekvam

The torque in the clutch and gearbox depends on what is connected to both sides. In one end, we have the engine. It can produce a certain maximum torque. In the other end, we have our tires. If they are not on the ground, the engine can not build up much torque in the clutch or the gearbox. There is not enough resistance.

On the other hand, if you have a 116i-engine revved up to 6000 RPM (not producing much torque, just revving high), and dump the clutch with grippy tires, you will get a high torque peak in the clutch and gearbox.

If you try the same with a higher gear, it gets even worse. The ultimate test of the clucth for slip, is to test driving in sixth gear. Clutch in, rev up, and dump the clutch. The creates a huge torque peak. A lot more than the engine can produce by flooring the throttle.

Makes sense - thank you. But are you advocating that the clutch and gearbox can handle 440nm of torque from the remap on a permanent basis?

[ovekvam]

Originally Posted by Dav1d

Makes sense - thank you. But are you advocating that the clutch and gearbox can handle 440nm of torque from the remap on a permanent basis?

It depends on how you use it. It is uncoordinated shifts and launches that kill off clutches and gearboxes. Or pulling caravans, if you are from Jylland! :-)

I am pretty sure the driveline will cope nicely will full power in gear. Maybe the gearbox can overheat if you do it for a long time.

[jabugui]

Originally Posted by Dav1d

Makes sense - thank you. But are you advocating that the clutch and gearbox can handle 440nm of torque from the remap on a permanent basis?

You surely don't be putting anywhere near 440nm in your drivetrain on a permanent basis. This peak figures are reached at full throttle... how often you do that? and how careful do you do that on a car? of course

The gearbox handles 450 or the like, so there's no problem at all. Of course frequent 1st gear full trottle (rude launches and doughnuts) will ruin the drivetrain with or without remap

[p47r1ck]

Originally Posted by Dav1d

I also have a BMW 120i B48 from May-2019. I have also thought about remapping the ECU. I reached out to a well-reputed tuning company in Denmark, asking for the expected output/performance after a remap with focus on reliability.
They gave me the answer, that I should expect 260-270 HP and 420-440nm of torque. Does anyone know how much torque the clutch and gearbox can handle? I guess there is a limit?

Hej David!

Det kommer an på hvilken årgang og måned din bil er fra, som afgør hvilken gearkasse du har i og hvor mange nm den kan holde til..

Jeg har selv en 120i fra 2019, den har en 8hp50 gearkasse som kan holde til 500nm (Siger ZF fabrikanten selv) Meeeeen hvis den er fra før 06 eller 07 måned 2017 (Pre-LCI) så har den 8hp45 gearkassen som kan holde til 450nm..


Jeg brugte BSR det første år jeg havde bilen, som lovede 284hk/432nm på hjemmesiden (som jeg husker det)
Havde den på rullefelt, og det blev til 265hk og 442nm, så vil sige det er tilforladeligt..

Nu har jeg komplet udstødning fra supersprint, de-catted den, fjernet OPF filteret, og andre små opgraderinger i motoren, og den yder 300hk og 475nm - og den kører upåklageligt, på 6. måned nu.

I bund og grund handler det også om hvordan du behandler motoren - hvis du laver launches og 0-100 med pedalen i bund flere gange om dagen, holder den selvfølgelig ikke så længe som hvis du ikke gør. Man skal lige tænke på du får motoren til og yde over 50% mere end den gjorde fra fabrikken.. Men med lidt sund fornuft kommer du højst sandsynligt ikke til og møde de store problemer :-)

[luisejr20]

To add on the gearbox, o have a friend that has a m135i with n55 and he has the exact same gearbox and mine, with a 120i B48, so gearbox is not gonna be an issue, but if you have a A version of the B48, pushing +420nm is not gonna be good for your pistons if you are using a OTS map. And the fuel is not very good.