Can anyone see (or know) max boost value on stock (or tuned) 50i?

[DuSh]

Just looking for the info - what's the stock max boost for 50i? In psi or bar - doesn't matter. If anyone can watch a live-view of boost value (or maybe a log) on bimmercode app (or any other) - I would appreciate! You will need to do a little WOT for that.

[perry8912]

Mission tuning did that test 1 year ago, the stock turbo can take about 25psi. But not sure the reliability after running that high for long time.
Below is the link I find. Hope that helps.
http://f10.5post.com/forums/showthread.php?t=1362416


BTW, I already brought bm3 tuning yesterday, and will flash it myself after vacation next month. It will push about 20-21psi on stage 1, which is pretty impressive to me. Will share the experience after it done.

[pits200]

Originally Posted by DuSh

Just looking for the info - what's the stock max boost for 50i? In psi or bar - doesn't matter. If anyone can watch a live-view of boost value (or maybe a log) on bimmercode app (or any other) - I would appreciate! You will need to do a little WOT for that.

Aren't we going to be limited by the tmap sensor? Do we have the 3.5bar sensor like the s63, if I had to guess, I don't think we do.

[DuSh]

Originally Posted by perry8912

Mission tuning did that test 1 year ago, the stock turbo can take about 25psi. But not sure the reliability after running that high for long time.
Below is the link I find. Hope that helps.

http://f10.5post.com/forums/showthread.php?t=1362416

Thank you! I contacted MP (mission performance) tuning and they said 25psi was only for dyno - basically a one time deal. They said for reliability to stick to 20 psi. They still recommended 3.5bar tmap sensor - just because it's useful to have signal - so that 20psi can be targeted and monitored easily.

Originally Posted by pits200

Aren't we going to be limited by the tmap sensor? Do we have the 3.5bar sensor like the s63, if I had to guess, I don't think we do.

You are right pits200, we only have 2.5bar - but OEM BMW N20 tmap sensor (the one everyone uses for 3.5bar) is about $80 (we need 2 of them) and it's a direct swap - just couple fasteners to hold them.

So I'm probably going to start with 3.5 bar tmap sensors and then decide on tune. Does anyone know what is the boost limit on stock oem flash? I'm just trying to gauge how much room we have till 20psi.
Thank you

P.S. Good news is MP said stock downpipes are fine for 20psi. Apparently BMW spent time making them to flow very well. So that's a huge plus already. No CEL and no emission issues.

[DuSh]

So here's what I'm going to go with soon:
1. 3.5bar tmap sensors (this will allow a heads of room for boosts at 20psi and for higher boost if need be): https://www.fcpeuro.com/products/bmw...or-13627843531
2. Tune that will be Stage 2 but with stock downpipes - i already have confirmation from 2 tuners that stock DPs are fine at 20psi. Keep in mind majority will say that you need DPs. Which in theory is true.
3. The only last piece missing is fuel choice. If I go with meth for cooling - then it creates additional issue to integrate it with tune and to have failsafe option. If I go with E85 mix - I will have to stick with that tune. I'm just not sure if tune will be able to adjust for different fuels? Probably not. I probably need to choose and stick to 1 fuel.

[pits200]

Here's the thing about stock turbos, you can absolutely hammer on them midrange, they hold up well at 2k to 5.5k rpms. After that is when you run into diminishing returns. I'm guessing your could run 26psi midrange and taper to 18 at high rpms.

[DuSh]

Originally Posted by pits200

Here's the thing about stock turbos, you can absolutely hammer on them midrange, they hold up well at 2k to 5.5k rpms. After that is when you run into diminishing returns. I'm guessing your could run 26psi midrange and taper to 18 at high rpms.

Ah, that is a great idea! I haven't thought about it. I need to speak to tuners about it - whoever I decide to go with. So in that case 3.5bar sensor is a must to be able to go over 20psi.

[perry8912]

What is the stock psi? And how much the 2.5bar sensor can hold?

Dush, You truly are a brave man, to push the stock car to its limit without worried about reliability issues. I’m wondering how long do you want to keep your car, I guess 1-2yrs maybe?

[DuSh]

Originally Posted by perry8912

What is the stock psi? And how much the 2.5bar sensor can hold?

Dush, You truly are a brave man, to push the stock car to its limit without worried about reliability issues. I’m wondering how long do you want to keep your car, I guess 1-2yrs maybe?

I spoke with Bob (from BPC) and he does not recommend to go above 20psi as it increases the risk of bending a rod. Couple of N63 and N63TUs ended up that way. So I guess we need to stay reasonable. If there's anyone I trust it's BPC - they know their stuff. He also said that he can go on stock tpms sensor up to 21psi, so basically no need to buy that sensor - which is good, saves money.
I'll go with their meth kit and 20psi (I'm taking all responsibility and accepting the fact that it may be dangerous). I'm currently at 18psi (BPC tune Bob flashed my X5). So 2psi increase is still going to be noticeable increase and it will make me happy. In addition meth will provide cooling and cleaning. I can really use cooler IATs in Arizona heat.

Going to deal with exams first in June and then I'll dive into this.

P.S. So I forgot to ask him, but I guess stock oem flash has about 14-15psi max limit. Stage 1 that I have has 18psi limit. So I'm basically going to go with 20 psi (not recommended by him, but I'll take my chances). So basically 25-26psi we've seen from other tuners who pushed it to the limit on dyno (with 3.5bar tmps) - that is like asking to blow off your turbos and bent rods (whatever happens first or maybe both lol). As much as I wanted to try that - now i understand why we don't see much of cars like that on the forums.

[Katsumoto]

Originally Posted by DuSh

I spoke with Bob (from BPC) and he does not recommend to go above 20psi as it increases the risk of bending a rod. Couple of N63 and N63TUs ended up that way. So I guess we need to stay reasonable. If there's anyone I trust it's BPC - they know their stuff. He also said that he can go on stock tpms sensor up to 21psi, so basically no need to buy that sensor - which is good, saves money.
I'll go with their meth kit and 20psi (I'm taking all responsibility and accepting the fact that it may be dangerous). I'm currently at 18psi (BPC tune Bob flashed my X5). So 2psi increase is still going to be noticeable increase and it will make me happy. In addition meth will provide cooling and cleaning. I can really use cooler IATs in Arizona heat.

Going to deal with exams first in June and then I'll dive into this.

P.S. So I forgot to ask him, but I guess stock oem flash has about 14-15psi max limit. Stage 1 that I have has 18psi limit. So I'm basically going to go with 20 psi (not recommended by him, but I'll take my chances). So basically 25-26psi we've seen from other tuners who pushed it to the limit on dyno (with 3.5bar tmps) - that is like asking to blow off your turbos and bent rods (whatever happens first or maybe both lol). As much as I wanted to try that - now i understand why we don't see much of cars like that on the forums.

Hey Dush, i have finally installed the BPC flash. It's been a week now and man, that is crazy different level ... just a question for you ... why you are pushing it to the limit ? Why dont you get X5M and do the BPC flash ... i am sure you will be more than happy with it . At lease that is what i will do if i was you .

[Maverik259]

I love when people ask "why you don't just buy an M if you want more HP!"

$30-40k in price difference is a big reason. Lol

And One could buy a 50i and one could spend half that and have a way more powerful 4.4l V8 without the "M" badge.

[Katsumoto]

Originally Posted by Maverik259

I love when people ask "why you don't just buy an M if you want more HP!"

$30-40k in price difference is a big reason. Lol

And One could buy a 50i and one could spend half that and have a way more powerful 4.4l V8 without the "M" badge.

i love people like you Maverik that are all over the postings and throwing critics all over ...

I know what is the difference between 50i and M and exactly how much that is in $$$ ... one thing i will tell you ... no matter what you do M is M ... whatever you will modify on your 50i cannot compare at all the the same if you do on M ... between me and you ... driving couple years old 14-15 x5 its is not even close to compare with driving 2017 M. Anyway , no hard feelings ...

[pits200]

Simple answer to all this dush, go look on the 550 forums, there are way more tuned 5 series than x5s. I find it hard to believe these cars would bend rods around 20psi.

[DuSh]

Originally Posted by Vlado

Hey Dush, i have finally installed the BPC flash. It's been a week now and man, that is crazy different level ... just a question for you ... why you are pushing it to the limit ? Why dont you get X5M and do the BPC flash ... i am sure you will be more than happy with it . At lease that is what i will do if i was you .

Oh man, I remember that feeling when I first got my tune.

X5M is the beast. BPC did a forged internals (happened just recently if I'm not mistaken) and lots of other stuff in S63TU and got it over 1500whp. Now that's a mind blowing power. I wish I had that. But man, I have a 5 year credit still on my X5 lol. That and a huge debt I have on my shoulders ($380k school debt) restrict me to anything else. I'll probably die in my X5: either from overboosting and getting a bent rod flying out of engine and crack my sorry head or from X5 rusting away in 20 years and I'm driving into a ditch from a broken rusted control arm Because I won't be able to afford anything else for next 20 years until I pay off all debts lol.

[perry8912]

Originally Posted by Vlado

Hey Dush, i have finally installed the BPC flash. It's been a week now and man, that is crazy different level ... just a question for you ... why you are pushing it to the limit ? Why dont you get X5M and do the BPC flash ... i am sure you will be more than happy with it . At lease that is what i will do if i was you .

Same reason why people mod their x5m instead of buying a Urus.....

[Katsumoto]

Originally Posted by perry8912

Same reason why people mod their x5m instead of buying a Urus.....

cant compare Urus vs X5M .... not even close.... i bet you after 2 years and 15k Miles value of the Urus will not be down $40k. That is 100% . anyway .. we are going of topic so lets just not discuss any of that and keep the thread going the direction that Dush start .

[Maverik259]

Originally Posted by perry8912

Same reason why people mod their x5m instead of buying a Urus.....

Lol, yes yes yes

[Maverik259]

Originally Posted by Vlado

i love people like you Maverik that are all over the postings and throwing critics all over ...

I know what is the difference between 50i and M and exactly how much that is in $$$ ... one thing i will tell you ... no matter what you do M is M ... whatever you will modify on your 50i cannot compare at all the the same if you do on M ... between me and you ... driving couple years old 14-15 x5 its is not even close to compare with driving 2017 M. Anyway , no hard feelings ...

Sorry to offend you. It's just a silly question that typical M drivers like to throw around to the non-M drivers on here. Everyone knows how great M cars are compared to non-M. That's a no brainer. If I had an extra $30k when I was looking for my X5 I woulda got one myself.