[togs_n55]

I am going to pick up my new 2011 BMW 335i n55 I want to push 400 whp. Is that possible on the stock turbo? What else would I need?

[TunafishE93]

Its highly unlikely with stock turbos, 360hp to the wheels, full bolt on running e85 would be a better target. The stock turbo being the limiter here.

[TheGoodTheBadTheUgly]

I think that with FBO, methanol injection and a custom tune you could maybe obtain good (not too close) numbers, if enough timing and boost can be added safely, but I don't know if its a better idea than focusing on fueling. Best could even be to have meth injection with e85 blend (or idealy race fuel) but I think all of these modifications, once FBO and tuned, will be strongly bottlenecked by the restrictive stock turbo, so again not sure that number is reachable.

[Turbod]

380-390 is more realistic on the stock turbo. If you want 400 then the PS2 is a good option for you. You can do 400+ on pump gas.

[maxihari]

I was 360-370 all day on E, and JB4, FBO (a catted pipe, not catless).
pump 330-340
(fully stock 278 btw)

Now on Pure 1, still FBO, custom -conservative tune, pump gas easily 360, 370.
In spring, doing E map... expecting 400-410.

[dleccord]

Originally Posted by maxihari

I was 360-370 all day on E, and JB4, FBO (a catted pipe, not catless).
pump 330-340
(fully stock 278 btw)

Now on Pure 1, still FBO, custom -conservative tune, pump gas easily 360, 370.
In spring, doing E map... expecting 400-410.

is that at the crank of wheels?

[TunafishE93]

Also what dyno do you want to make 400hp on. You also have to consider what dyno the numbers people are giving you. The dyno jet 400hp is reachable but not reality. https://www.e90post.com/forums/showthread.php?t=891691

[maxihari]

Wheels.

Multiple runs from stock to modified on the same dyno, same conditions, very similar temperatures, by the same operator.

Same and very similar numbers confirmed in the Virtual dyno in dozens of runs and from there conclusions drawn.

In the spring, once all is dialed in, going back to the same dyno to confirm. (Custom E map on pure stage 1).
Big drawback, as we all know is octane, and e-mix is really allowing for amazing gains.

Also, notice that I'm stating ranges and that I'm ok to be outside of those ranges as well.
I'm not really that obsessed with actual numbers, but rather overall improvement from the actual stock dyno runs.

[bobbby]

What's the rough whp for a 2011 N55 running MHD stage 1+?

[NRigs]

Originally Posted by bobbby

What's the rough whp for a 2011 N55 running MHD stage 1+?

I would be surprised if you made 300 whp.

When I was MHD stage 1+, my car was still slower than a 2013 Audi Allroad with an upgraded turbo that made 300whp/400wtq.

These cars are honestly pretty slow until you start upgrading fueling or adding meth and custom tunes.

[dleccord]

Originally Posted by NRigs

I would be surprised if you made 300 whp.

When I was MHD stage 1+, my car was still slower than a 2013 Audi Allroad with an upgraded turbo that made 300whp/400wtq.

These cars are honestly pretty slow until you start upgrading fueling or adding meth and custom tunes.

isnt PPK1 higher than that?

[Turbod]

Originally Posted by bobbby

What's the rough whp for a 2011 N55 running MHD stage 1+?

It's really hard to say what the dyno will read. I made 293whp stock so it would makes sense that stage 1+ would be above 300whp. Really the question should be about the power gain. I haven't ran the OTS maps and don't plan to so I don't have any feedback related to them. When I went from stock to 12psi I picked up 4mph in the 1/4 which means there was power made. These cars really just need higher octane to make more power.

[anjuna]

Originally Posted by togs_n55

I am going to pick up my new 2011 BMW 335i n55 I want to push 400 whp. Is that possible on the stock turbo? What else would I need?

It's possible, but you'll be killing everything in the process. For reference, I made 392/448 on the stock turbo. 26psi with a HEAVY taper toward top end (you'll be lucky to get 12psi at max RPM), VANOS was terrible, timing was incredibly advanced, and I was using meth inject with 100% mix, raised the valvetronic max lift, xDelete (which, actually crashed my transfer case computer, but it defaulted to RWD only) and a bunch of other stupid stuff.

Do not suggest. If you want to do it right, just follow the standard path...

charge pipe, PS2, meth inject, port inject, intercooler, downpipe, proper tune.

[TunafishE93]

What platform are you running?

[whyzee125]

Not a chance of 400 whp on stock turbo, it’s just too small. I would do a pure stage 1 oaks meth or E85 blend. You could do 400whp safely that way.

[anjuna]

Originally Posted by TunafishE93

What platform are you running?

F25 - 2011 X3

Although an "F" platform, since it was the first year of X3 with N55, the entire platform is IDENTICAL to an e90 with N55.

Same engine, same PWG turbo, same ZF 6HP, same x-drive (all the way down to the module - can't use X-drive for F series) etc etc.

It's functionally identical to an e90. There are a lot more people tuning 3 series though, as opposed to "mom car grocery getters"

[starbuck]

Stock turbo will be tough to hit that number.

I went FBO, ps1, e30 custom tune and meth for cooling. With all that I've dyno'd between 400 and 410 awhp consistently. Ther may be a bit more in the ps1 but not much.

Obviously ps2 is a good route, but where I started focusing my time recently is weight reduction and its making a huge diff. Ive done lighter wheels, brakes, rear seat delete, lighter front seats, sunroof delete ...all adding up to 200lbs of savings of which some is unsprung, rotational or up top

The goal of whp is interesting because its just a measurement tool from a baseline to show gains ...ideally on the same dyno and similar conditions. If the real objective is getting faster, then it can be done in a few ways even on the stock turbo. Ive watched 400whp+ cars put up slow quarter mile times at the track because they can't put the power down, its a matter of what you're really looking to achieve