[RJH52]

What are the best engine tunes cost to HP/TQ gain for thr 540ix?

Also, are there any that do not void the warranty?

[NGT2]

They all void the warranty.

[tjbuggy2b]

Well, yes, they all (technically) void the warranty but some of them are reversable. So, can revert to stock, if you need to take it in for work.

[NGT2]

Originally Posted by tjbuggy2b

Well, yes, they all (technically) void the warranty but some of them are reversable. So, can revert to stock, if you need to take it in for work.

Yes but all the data is still stored. If you blow your engine and BMW wants to find out why, they’ll see the higher boost numbers. These computers make it hard to be totally stealth with your tune. That’s why I never tuned my 540. Just don’t feel any need or desire with the 550.

[tjbuggy2b]

Fair point.

[NGT2]

There are a lot of tunes that appear to be pretty safe and people have used for tens of thousands of miles without issue. People just need to know the warranty implications. It shouldn’t void warranty on unaffected components but if you have a powertrain issue, it can be used to void your warranty. Sunroof or AC stopped working? Not such a risk.

[BMW012]

look into jb+ for a quick plug and play 40hp. not really a tune and dont think it will cause warranty issues, but not 100%. pretty safe in general.

[RJH52]

Originally Posted by BMW012

look into jb+ for a quick plug and play 40hp. not really a tune and dont think it will cause warranty issues, but not 100%. pretty safe in general.

I noticed Dinan has a similar one too

[tsbrown]

4 years on a Dinan Elite V2 tune for my pre-LCI B58 (the “warranteed” version) and no issues. But I also don’t flog the car like I did my E90 M3. The B58 is pretty robust and most reasonable tunes are probably fine, but BMW can deny warranty coverage if they determine the tune is at fault. Have you considered CarBahn? It’s Steve Dinans new company.

[Neusser]

Originally Posted by NGT2

Yes but all the data is still stored. If you blow your engine and BMW wants to find out why, they’ll see the higher boost numbers. These computers make it hard to be totally stealth with your tune. That’s why I never tuned my 540. Just don’t feel any need or desire with the 550.

I'm not even sure I want to tune my 540; it's pretty quick for most situations. Most of the stuff that blows me away on the Autobahns here would still blow me away even with a stage 1 or 2 at 420-470 hp.

[HerkHealer]

Originally Posted by NGT2

Yes but all the data is still stored. If you blow your engine and BMW wants to find out why, they’ll see the higher boost numbers. These computers make it hard to be totally stealth with your tune. That’s why I never tuned my 540. Just don’t feel any need or desire with the 550.

Exactly.
And all 2021+ G30's that have OTA updates will send any "abnormal" parameters to the BMW Cloud. Such as higher than normal boost and timing readings. Which is precisely what tunes do.

[NGT2]

Originally Posted by Neusser

I'm not even sure I want to tune my 540; it's pretty quick for most situations. Most of the stuff that blows me away on the Autobahns here would still blow me away even with a stage 1 or 2 at 420-470 hp.

If I got another 540, I wouldn’t tune it. It’s a fast car. It accelerates quickly and it will haul ass on the highway without breaking a sweat.

[jsf721]

Mine is a DD. I buy em how I want em. It does all I need. Been bit in the butt by mods.

[tsbrown]

Originally Posted by NGT2

If I got another 540, I wouldn’t tune it. It’s a fast car. It accelerates quickly and it will haul ass on the highway without breaking a sweat.

True. My Dinan tune added ~40 bhp + trq to bring it to about 375, similar to the M340i or X3 M40i factory tune. Nice to have, but certainly not necessary. Had the same piggy back on my F30 340i for a couple years with no issues there either. But the base B58 is really solid as-is.

[The Zimmer]

Buy a second hand ecu Tune that then keep your ECU safe if you need to take for work just put original ECU back

[uberboosted]

Originally Posted by NGT2

If I got another 540, I wouldn’t tune it. It’s a fast car. It accelerates quickly and it will haul ass on the highway without breaking a sweat.

I'm going to give an alternative opinion. I'm running bootmod3 Stage 1, and IMO the car is much more enjoyable to drive than without the tune.

It's a bit of a pain in the ass to have to reflash when changing fuel grades (I usually run E30), but overall I'm really glad I did it.

[Neusser]

Originally Posted by NGT2

If I got another 540, I wouldn’t tune it. It’s a fast car. It accelerates quickly and it will haul ass on the highway without breaking a sweat.

I'd like to know what the B58 is actually making in most applications. Seems most dynos show it makes about 20-25 hp more at the crank than stated by BMW.

It definitely feels faster than 340 metric hp, even accounting for Xdrive. But IDK.

[Chappers 71]

My G31 was mapped when I bought it, which I didn’t know about until it had to go into the MD for warranty work.

I don’t know what map it’s running or who did it but the sports dials show an indicated 480 bhp & 600nm of torques, what I do know is it’s quicker than an F series M4 in a straight line which is entertaining.
Have had no tune related issues in the 15 months & 5,000 miles I’ve covered since buying it.
Don’t think I’d be enjoying the G31 as much if it were stock & didn’t have the tune & exhaust

[Alscoob]

Originally Posted by Chappers 71

My G31 was mapped when I bought it, which I didn’t know about until it had to go into the MD for warranty work.

I don’t know what map it’s running or who did it but the sports dials show an indicated 480 bhp & 600nm of torques, what I do know is it’s quicker than an F series M4 in a straight line which is entertaining.
Have had no tune related issues in the 15 months & 5,000 miles I’ve covered since buying it.
Don’t think I’d be enjoying the G31 as much if it were stock & didn’t have the tune & exhaust

Have a word with Lorcan at Rossiters he might be able to tell you what it has. Lorcan@rossiters.co.uk +44 (0)1485 542000

They were until last month AC Schnitzer UK and have carried out many conversions on new cars for dealerships and private individuals prior to delivery, yours may have been a car they did? or supplied parts for.

Seeing as you have the ACS bodywork & exhaust quite likely you could have their tuning box too. This is made by Steinbauer but to a bespoke set up for ACS.

[Neusser]

Originally Posted by Chappers 71

My G31 was mapped when I bought it, which I didn’t know about until it had to go into the MD for warranty work.

I don’t know what map it’s running or who did it but the sports dials show an indicated 480 bhp & 600nm of torques, what I do know is it’s quicker than an F series M4 in a straight line which is entertaining.
Have had no tune related issues in the 15 months & 5,000 miles I’ve covered since buying it.
Don’t think I’d be enjoying the G31 as much if it were stock & didn’t have the tune & exhaust

The main thing that concerns me with mapping mine is the ZF tranny. The G31 and G30 use a different torque converter than the other B58 engines.

If you buy the M Sound and Power Kit, the new converter is supplied with the kit. Given that the M kit only takes power to 360 hp, I wonder what 400+ hp is doing to a stock transmission with no new converter. Also the stock transmission is rated for 500nm of torque, and most tunes put out more than that ...

I can't seem to get a straight answer on this anywhere.

[Chappers 71]

Originally Posted by Neusser

The main thing that concerns me with mapping mine is the ZF tranny. The G31 and G30 use a different torque converter than the other B58 engines.

If you buy the M Sound and Power Kit, the new converter is supplied with the kit. Given that the M kit only takes power to 360 hp, I wonder what 400+ hp is doing to a stock transmission with no new converter. Also the stock transmission is rated for 500nm of torque, and most tunes put out more than that ...

I can't seem to get a straight answer on this anywhere.

A quick google tells me the g31 540i has the 8hp 75 & that’s rated at 740nm/546lb-ft so one would assume ZF fit a TC that can take that plus a little more.

Anyways it’s not as if maximum torques or bhp’s are able to be deployed very often, if at all during every day driving so I don’t worry about the gearbox breaking.
What the added power & torque does is make the mundane journeys enjoyable

[Neusser]

Originally Posted by Chappers 71

A quick google tells me the g31 540i has the 8hp 75 & that’s rated at 740nm/546lb-ft so one would assume ZF fit a TC that can take that plus a little more.

Anyways it’s not as if maximum torques or bhp’s are able to be deployed very often, if at all during every day driving so I don’t worry about the gearbox breaking.
What the added power & torque does is make the mundane journeys enjoyable

It is the torque converter that it is the issue, and everything I read over here said the car has the 8HP50. All the German forums mention it in the context of tuning. The converter is rated for 500 nm max, which is why BMW supplies a new one if you buy the M-Performance Power and Sound kit.

Over here in Germany I can go full blast quite often, so it is a concern.