[Ray-India]

My car was running their stage 1 map (260hp/400NM i think). The motor bent a rod on cyl 2. Car was still running but horrible misfires due to the best rod and low compression due to the same.
Got the entire shortblock replaced by BMW. I'm not too confident on mapping this motor now.
What tunes are you guys running? Who are the tuners and what sw are they using.

[N420i]

Originally Posted by Ray-India

My car was running their stage 1 map (260hp/400NM i think). The motor bent a rod on cyl 2. Car was still running but horrible misfires due to the best rod and low compression due to the same.
Got the entire shortblock replaced by BMW. I'm not too confident on mapping this motor now.
What tunes are you guys running? Who are the tuners and what sw are they using.

Bent rod might be due to extreme knocking.
What kind of gas were you running? Can you trust it? I assume you don't have any logs available to see what kind of AFR and timing the tune was running?

260hp and 400nm is among the milder stage 1 tunes out there. Most are pushing 270+hp and close to 430nm.

[Sweeney921]

I wonder if the stock air-liquid system is able to avoid heat soaking on a stage 2 tune. Does anyone sell a bolt-on intercooler upgrade for the B48?

[N420i]

Originally Posted by Sweeney921

I wonder if the stock air-liquid system is able to avoid heat soaking on a stage 2 tune. Does anyone sell a bolt-on intercooler upgrade for the B48?

So far i'm really, really impressed with the ability of the stock intercooler to remove heat both from the intake charge and from itself.

At the track a few weeks back the intake air temps never went over 40ºC. Granted it was only 10ºC outside but still, I thrashed the thing and IATs stayed rock solid and low, as did the catalytic converter temps. Never went over 850ºC, and I can get it almost that hot just driving normally on the street.

[Sweeney921]

Originally Posted by N420i

So far i'm really, really impressed with the ability of the stock intercooler to remove heat both from the intake charge and from itself.

At the track a few weeks back the intake air temps never went over 40ºC. Granted it was only 10ºC outside but still, I thrashed the thing and IATs stayed rock solid and low, as did the catalytic converter temps. Never went over 850ºC, and I can get it almost that hot just driving normally on the street.

That's great to hear! The B-series engines are rock solid so far with the minor exception of intermittent, unexplained coolant loss.

Interested to find out what caused the one connecting rod failure that's been reported.

[N420i]

Originally Posted by Sweeney921

I wonder if the stock air-liquid system is able to avoid heat soaking on a stage 2 tune. Does anyone sell a bolt-on intercooler upgrade for the B48?

Also, aftermarket intercoolers are a no-go on a B48/58 since the intercooler is integrated into the intake manifold. It'd be crazy expensive to replicate a part like that.

I assume you could put an additional air-to-air inline before the stock intercooler, but then you'd have lag to deal with...

[Sweeney921]

Originally Posted by N420i

Also, aftermarket intercoolers are a no-go on a B48/58 since the intercooler is integrated into the intake manifold. It'd be crazy expensive to replicate a part like that.

I assume you could put an additional air-to-air inline before the stock intercooler, but then you'd have lag to deal with...

Good point, I hadn't thought about that. Just thinking outside the box here, but air-liquid thermal performance could theoretically be improved by:

1. Increasing the coolant flow rate
2. Increasing the coolant volume
3. Reducing the cooling system operating temp
4. Insulating the low temperature coolant lines

Something tells me that there won't be many aftermarket options to improve the B-series cooling system, particularly since they already seem to be able to support stage 2 mods.

[Ray-India]

So what brand/tuner of maps are you all using?

[N420i]

BR-performance out of Belgium in my case, but the maps were loaded and dynoed by a local distributor.

In regards to B48-58 similarities, the 20i actually shares MORE components with the B58 than the 30i does. They use the same pistons and run the same compression ratio, while the 30i uses lower compression pistons. Every other engine, intake and exhaust part except for the rear muffler is the same for the 20i and 30i versions of the B48.

There are some crazy-ass, stock internal B58s nudging 550bhp atm, and now that it's ECU flash open season, I've little doubt we'll be seeing 600bhp soon. Even at 550, if that scales evenly with the number of cyclinders (which I doubt it will due to engine balance considerations...) it means the stock internals of the 20i should be good for close to 350bhp... Funny thing is you only need 400nm at 6200rpm to make 350hp, and it's usually torque that breaks engines, not power.

The rod bearings are different between the the B48 and B58s though...

[bpma]

Since there's so little difference between the B engines, does that mean that... swapping a B48 out for a B58 is potentially possible?

[N420i]

Originally Posted by bpma

Since there's so little difference between the B engines, does that mean that... swapping a B48 out for a B58 is potentially possible?

Oh I have absolutely no doubt it's feasable with remarkably little physical effort and very few ancillary parts and adapters IF ANY beyond the airbox, intake tubing, downpipe and exhaust.

The real nightmare would be getting all the pertinent modules and ECUs coded. But then again there are coding magicians out there making all sorts of stuff happen, so I bet it can be done, too...

[bpma]

That would be a game-changer in markets like mine, where there's a ridiculous tax on anything bigger than 2 liters.

Well then, fingers crossed that someone succeeds at this.

[N420i]

Originally Posted by bpma

That would be a game-changer in markets like mine, where there's a ridiculous tax on anything bigger than 2 liters.

Well then, fingers crossed that someone succeeds at this.

Depending on how much power you're aiming at, it might not be worth it...

I mean yeah if you wanna go full out and head for 400+hp then you're forced to swap in a B58, but if 350 is enough that can potentially be reached with significantly less expense and complexity just by pushing a B48. Secondhand B58s aren't gonna be cheap...

[bpma]

I've seen 320 hp / 450nm on a b48 already, but the question is how safe those numbers are in the long run. I guess we're the guinea pigs here.

[N420i]

Originally Posted by bpma

I've seen 320 hp / 450nm on a b48 already, but the question is how safe those numbers are in the long run. I guess we're the guinea pigs here.

30i B48 or 20i B48?

Any supporting mods or just pushing the thing like crazy?

At a minimum, I'd think you'd have to be running a catless downpipe and potentially an intake to reach those numbers. Probably e85 too... I didn't think the stock turbo would stretch that far...

[Stigster]

https://www.instagram.com/p/BmlNhG6FfLO/?utm_source=ig_share_sheet&igshid=hesp8hmz4yz4

[bpma]

Here's an example - B48 in the F36, just the downpipe, and not even a de-catted one.

Seems feasible that 300+ will be commonly seen on b48's once ECUs are cracked inside out. I will most likely go with a catless DP and tune by the end of the year too.

[Sweeney921]

I'd happily spend thousands to swap a B58 into my F31, even if the B48 it has now could reliably generate 300 bhp. I wonder if the transmission would have to be swapped, too.

Let's get a thread going and convince someone to take the plunge on the first B58 swap.....

EDIT: I do not volunteer as tribute.

[eleven11]

Originally Posted by Sweeney921

I'd happily spend thousands to swap a B58 into my F31, even if the B48 it has now could reliably generate 300 bhp. I wonder if the transmission would have to be swapped, too.

Let's get a thread going and convince someone to take the plunge on the first B58 swap.....

EDIT: I do not volunteer as tribute.

Same here. I'm considering a swap in a few years.

In case you missed it:
https://f30.bimmerpost.com/forums/sh....php?t=1548060

[Sweeney921]

Originally Posted by eleven11

In case you missed it:
https://f30.bimmerpost.com/forums/sh....php?t=1548060

Awesome, definitely subb'ing that thread!

[N420i]

Originally Posted by Stigster

https://www.instagram.com/p/BmlNhG6FfLO/?utm_source=ig_share_sheet&igshid=hesp8hmz4yz4

This one's running meth injection as well as a catless DP

Originally Posted by bpma

Here's an example - B48 in the F36, just the downpipe, and not even a de-catted one.

Seems feasible that 300+ will be commonly seen on b48's once ECUs are cracked inside out. I will most likely go with a catless DP and tune by the end of the year too.

Whoa that's nudging right into stock 340 territory... That's crazy. And 470nm of torque!!

If that thing holds up we know the rods are strong...

[RMMAGA]

I think detonation is main issue with 20i. I'm running 93 with about 250ml of boostane per tank which should give be about 99, and meth.

Running about 23psi on stage 2 flash, so far so good. But am really worried about det and therefore will run the half can of boostane each tank until we know more just to be safe or at least as safe as I can be at 23psi, LOL

seems like some timing correction, also IAT increase quick in top end, I think stock turbo is really reaching limit and getting really inefficient causing IAT to increase rapidly, but it does hold 21 psi to 6500rpm

running 11.8 AFR at about 6 deg timing up top

Its pretty fun , I can pretty easily get 4.8s 0-100km on a VBOX and basically shred the tires the entire first gear at will, no access to dyno here but I think 300-320hp is about right

still running stock exhaust but without cat, next thing I think is to go to wider diameter exhaust, the 20i is smaller then 30i so that probably not good