[Mkinzie]

Originally Posted by ZM2

Grab a Dorch Stg 2 HPFP, add some E85 or Racegas, flash the Stg 2+ map, and hold on: https://f87.bimmerpost.com/forums/sh....php?t=1774687

I can attest to this. Even with dorche stg 1. & I bought Zm2’s Dinan.
On race gas. Flashed stage 2+. And holy shit !

[JMM]

I would like to revive this thread.

I have read through everything and there is clearly a lot of technical talk to substantiate certain things but really it all boils down to the fact that you need to have a very good grasp of a matter to get the maximum result from it.

Apart from that, it's also a must for me that the power of a car should be at the highest possible rpm, just as it is for seanWRT and I am lucky to know, here in Belgium, a tuner who has even exceeded my expectations because of his skill.

Draw your conclusions with the graph below of my stock M2 with just two mods: Larger intercooler (Similar to Wagner) and K&N filter, that's all.
Fuel is RON 98 (European standard) and 18 degrees C outside temp.
So just to be clear for the doubters also stock spark plugs, stock cat and stock high pressure fuel pump

I don't have hard figures but it's damned fast and pulls like a bitch straight to 7000 rpm without even a hitch, same feeling if you pull up from 5000rpm to 7000rpm, no drop dead zone!

[///MPhatic]

Originally Posted by JMM

Draw your conclusions with the graph below of my stock M2 with just two mods: Larger intercooler (Similar to Wagner) and K&N filter, that's all. Fuel is RON 98 (European standard) and 18 degrees C outside temp. So just to be clear for the doubters also stock spark plugs, stock cat and stock high pressure fuel pump.

Is it even prudent to tune a stock car without a charge-pipe and down-pipe? And even if it were, these two common mods would make all the difference, no?

[JMM]

Indeed, it is always better to work with a sports cat to reduce the load on the turbo, which is why that will be my next mod.

But this tune falls within the safety margins as the max turbo pressure is 1.1 bar (16PSI) for a short time.

With a sportcat it can be optimised a bit more but then the high pressure pump will certainly play a role.

[ZM2]

Originally Posted by JMM

I would like to revive this thread.

I have read through everything and there is clearly a lot of technical talk to substantiate certain things but really it all boils down to the fact that you need to have a very good grasp of a matter to get the maximum result from it.

Apart from that, it's also a must for me that the power of a car should be at the highest possible rpm, just as it is for seanWRT and I am lucky to know, here in Belgium, a tuner who has even exceeded my expectations because of his skill.

Draw your conclusions with the graph below of my stock M2 with just two mods: Larger intercooler (Similar to Wagner) and K&N filter, that's all.
Fuel is RON 98 (European standard) and 18 degrees C outside temp.
So just to be clear for the doubters also stock spark plugs, stock cat and stock high pressure fuel pump

I don't have hard figures but it's damned fast and pulls like a bitch straight to 7000 rpm without even a hitch, same feeling if you pull up from 5000rpm to 7000rpm, no drop dead zone!

Nice curve. I believe that’s ~370whp, if my math is right.

[JMM]

I can't say for sure, but I suspect you can deduct about 45 hp, which would give me about 391 whp but it can certainly be a bit less.

[ZM2]

Originally Posted by JMM

I can't say for sure, but I suspect you can deduct about 45 hp, which would give me about 391 whp but it can certainly be a bit less.

It’s a bit lower than that right now, still a nice curve tho.

You’ll get 390-400whp (~465 ps/pk) once you install a downpipe and push the tune a little more.

[AmuroRay]

Originally Posted by JMM

I would like to revive this thread.

I have read through everything and there is clearly a lot of technical talk to substantiate certain things but really it all boils down to the fact that you need to have a very good grasp of a matter to get the maximum result from it.

Apart from that, it's also a must for me that the power of a car should be at the highest possible rpm, just as it is for seanWRT and I am lucky to know, here in Belgium, a tuner who has even exceeded my expectations because of his skill.

Draw your conclusions with the graph below of my stock M2 with just two mods: Larger intercooler (Similar to Wagner) and K&N filter, that's all.
Fuel is RON 98 (European standard) and 18 degrees C outside temp.
So just to be clear for the doubters also stock spark plugs, stock cat and stock high pressure fuel pump

I don't have hard figures but it's damned fast and pulls like a bitch straight to 7000 rpm without even a hitch, same feeling if you pull up from 5000rpm to 7000rpm, no drop dead zone!

I don’t buy it. No before and this after isn’t even an N55 power curve. Peak torque happens at the the wrong RPM, peak HP is at 6500rpm, stock down pipe, stock fuel pump, no logs.

Yeah, they just printed off a sheet and gave it to you. For the record, you can make about 370whp on a stage one tune, I’ve seen it:



But you’ll note that the power nosedived towards 7000rpm because of egts and back pressure.

Per BR performance themselves, they don’t even advertise those gains on stage 1

https://www.br-performance.be/en-be/...pp/?stage=7994

[JMM]

Originally Posted by ZM2

It’s a bit lower than that right now, still a nice curve tho.

You’ll get 390-400whp (~465 ps/pk) once you install a downpipe and push the tune a little more.

Yes, I also suppose that there is still a little profit to be made, but no more than that, because I think that the fuel pump is already on its toes.

[JMM]

Originally Posted by AmuroRay

I don’t buy it. No before and this after isn’t even an N55 power curve. Peak torque happens at the the wrong RPM, peak HP is at 6500rpm, stock down pipe, stock fuel pump, no logs.

Yeah, they just printed off a sheet and gave it to you. For the record, you can make about 370whp on a stage one tune, I’ve seen it:



But you’ll note that the power nosedived towards 7000rpm because of egts and back pressure.

Per BR performance themselves, they don’t even advertise those gains on stage 1

https://www.br-performance.be/en-be/...pp/?stage=7994

First of all: I have been a BR Performance customer for more than a decade with several cars, they are not going to mislead me with a fake print, I am a little too technically savvy for that and they know it.

Second: That tune you see on their site was one of the first they published but in the mean time a lot has been learned plus they have a new engineer who is mainly specialised in BMW.

Thirdly, I do know the difference between fast and slightly faster.
The first tune gave a similar graph to yours and off the top of my head it was 415HP at 5950rpm and 613NM of torque at 2150rpm, the current tune is clearly faster at higher rpm's.

Top power at too low rpm, that was not done for me and I asked for another tune with top power at at least 6500rpm, even though I would have less power than before.
I prefer 400HP at 6500rpm than 420HP at 5500rpm!
So they kept my car there for 2 days with the current result, which to be honest was also a surprise to me, as I expected a 400/410HP at 6500rpm.

And furthermore, if you don't believe me, so be it, but I know better.


PS: The link you posted is wrong because it is about a 4 series 435i and not een M2 thus incorrect data.
This is the correct link for the M2 tune:

https://www.br-performance.be/en-be/...-2016/7784-m2/

[Mhuber]

Originally Posted by JMM

I would like to revive this thread.

I have read through everything and there is clearly a lot of technical talk to substantiate certain things but really it all boils down to the fact that you need to have a very good grasp of a matter to get the maximum result from it.

Apart from that, it's also a must for me that the power of a car should be at the highest possible rpm, just as it is for seanWRT and I am lucky to know, here in Belgium, a tuner who has even exceeded my expectations because of his skill.

Draw your conclusions with the graph below of my stock M2 with just two mods: Larger intercooler (Similar to Wagner) and K&N filter, that's all.
Fuel is RON 98 (European standard) and 18 degrees C outside temp.
So just to be clear for the doubters also stock spark plugs, stock cat and stock high pressure fuel pump

I don't have hard figures but it's damned fast and pulls like a bitch straight to 7000 rpm without even a hitch, same feeling if you pull up from 5000rpm to 7000rpm, no drop dead zone!

Impressive power curve! I would say almost perfect for the M2.
The typical nosedive from most Stg2 maps after 5500rpm is an absolute no-go for me. Not on a M car.
However, I am also surprised that this can be achieved with the stock turbo...

[JMM]

Yes indeed, i was also surprised if only also because of the fact that everyone is saying that the high pressure fuel pump is the weakest link in the whole, together with the intercooler.

This is proof that if you know a matter through and through you can get the best out of it...My (cautious) conclusion is that on youtube and on forums there is a lot of hype together with the necessary bla, bla but with apparently less knowledge of the matter.

In any case, I do believe that if I have a sports cat installed, the power gain will be limited by the high pressure fuel pump but nevertheless, what this tuner has achieved with the stock fuel pump is amazing, even with the bigger intercooler.

[ZM2]

Originally Posted by JMM

Yes indeed, i was also surprised if only also because of the fact that everyone is saying that the high pressure fuel pump is the weakest link in the whole, together with the intercooler.

This is proof that if you know a matter through and through you can get the best out of it...My (cautious) conclusion is that on youtube and on forums there is a lot of hype together with the necessary bla, bla but apparently less knowledge of the matter.

In any case, I do believe that if I have a sports cat installed, the power gain will be limited by the high pressure fuel pump but nevertheless, what this tuner has achieved with the stock pump is amazing, even with a bigger intercooler.

With the stock turbo octane will be the limit before the HPFP, somewhere around 400whp.

Add a little ethanol, higher RON, or race gas and the stock HPFP will hold ~420whp, but I wouldn’t recommend that if you want a peak power upper RPM curve on the stock turbo.

I’d say just put the downpipe on, tweak the tune a little on 98 RON, and call it a day.

[JMM]

Yep, I'll just stick with 98RON. I'm very careful with my M2 so definitely no crazy stuff for me.

For the time being the sports cat is not a must have because I am already very happy with what I have now.

BTW, although I don't often use full power, the main reason for me to get a sports cat is to spare the turbo from the high back pressure it has now, the extra HP and exhaust noise are a nice bonus but come in second place.