N55 Large Turbo Tuning Info
 

Hey guys,

Enough people are adding larger turbos to their N55 now that it makes sense to maintain a single thread to use for tuning information, questions, etc. I'll add some info to this first post and update it with common questions as they come up.

First some general info. There are several turbo updates out there. The "stage2" turbos like the Vargas & PURE "stage2" are significantly larger than stock and require special tuning considerations, while the various "stage1" turbos (wheel swaps) are closer to stock and can generally use the same factory turbo tuning. The info below is more geared towards the "stage2" turbos. Those with "stage1" can probably get away without the back end flash, without a meth kit, etc, if they choose.

N55 Hybrid Turbo Tuning Requirements:

All models:

A N20 3.5bar TMAP sensor is required. Note those with a typeA harness need the adapter on our site. While those with typeB do not need an adapter to connect the 3.5bar TMAP sensor. The required sensor is BMW part number: 13627843531


E Series:

1) Run the latest JB4_N55 firmware
2) A JB4 MHD back end flash map is strongly suggested. We provide these maps free of charge as well as tuning support via the n54tech forum, but MHD charges a $199 fee for their flashing tool. Use the PUMP file as a starting point: http://www.n54tech.com/forums/showthread.php?t=43151
3) Enter the default settings in the second post. Note FutureUseD=64 disables "RPM FF Gain", which allows you to manually enter a duty bias curve that is more appropriate to larger turbos. For pump fuel start with map2, for E85 start with a 40 additive, and log, so we can help you dial it in from there.

F Series Pneumatic Wastegate:

1) JB4_N55 running F series ISO firmware required: http://www.n54tech.com/forums/showthread.php?t=47223
2) A back end flash map is required which can be loaded via MHD. Start with the PUMP map: http://www.n54tech.com/forums/showthread.php?t=51166

F Series Electronic Wastegate:

1) JB4_F30 running F series EWG firmware and EWG add on harness
2) A back end flash map is required which can be loaded via MHD. Start with the PUMP map: http://www.n54tech.com/forums/showthread.php?t=51166

Be sure to checkout our F chassis turbo inlet! https://www.burgertuning.com/product...w-intake-inlet

Maps:

When running a 3.5bar TMAP sensor with E series ISO firmware the map peak boost targets are as follows:

Map1: 16psi
Map2: 19psi
Map3: Progressive meth from 16psi to 25psi based on additive
Map5: Autolearning from 16psi to 20psi based on average timing
Map6: Custom map
Map 7: 20psi

Other Details:

1) The map and tuning settings will vary greatly depending on the specific turbo, fuel, and other car specific details. See E series N55 suggested settings below.
2) For those running E85 without methanol a Stage2 fuel pump from Fuel-IT is suggested.
3) For mixtures of 50% E85 or more we suggest port injection or a methanol kit.

Test Results:

PURE S2 N55 Recent Results: http://www.n54tech.com/forums/showthread.php?t=40044

PURE Stage2 435i EWG Dyno Testing: http://www.n54tech.com/forums/showthread.php?t=29245

PURE Stage2 DCT Pneumatic WG Dyno: http://www.n54tech.com/forums/showthread.php?t=30329

PURE Stage1 EWG Dyno: http://www.n54tech.com/forums/showthread.php?t=26268

Vargas Stage2 135i DCT Pneumatic WG Dyno: http://www.n54tech.com/forums/showthread.php?t=28341

Vargas Stage2 335i Automatic Pneumatic WG Dyno: http://www.n54tech.com/forums/showthread.php?t=22618

Vargas Stage2 335i Track Testing: http://www.n54tech.com/forums/showthread.php?t=22647

Vargas Stage1 335i Dyno: http://www.n54tech.com/forums/showthread.php?t=30328

Hey guys,

I'll use this post to throw up example settings and things from our various N55 larger turbo projects.

Here are the custom settings we came up with for PURE TURBO's E series development car. JB4 ISO, MT, E50, port injection (although meth could be used in place of PI with a small nozzle), and our back end flash map. Note for this dutybias "Disable RPM FF Gain" must be set under the FUD bit options.



Dyno result of this setup are here: http://www.n54tech.com/forums/showthread.php?t=31534

How much ethanol can you run with this back end flash?
I have a larger lpfp.

As much as the high pressure pump can take. I'd guess around 60% at 450whp.

I have pure stage 1: My FP H number went up alot after I have the flex fuel wire installed. It was always at 7 to 5 range but now is 11 to 15.:burnrubber:

Log attached, meth was spraying but not shown in the log bcos is a xx xx meth kit still waiting to install the failsafe wire. Pls advice on the log, thanks.

Sorry boost setting was here.

Pure turbo stage1 dyno
 

Just wanted to share my results with you all. Car feels like a small rocket.
However the car did not hit boost levels that it does on the street. I guess cooling issue? Still very happy with the results.
3 runs pure with different boost levels:
http://users.telenet.be/darkhold/pure_dyno_whp.JPG

And comparing best run with stock, jb4 map 3 40 meth adder:
http://users.telenet.be/darkhold/pure_dyno_comp_whp.JPG

The corresponding csvs:
max
daily
15psi
stockmap3

Wow, 647Mn of Torque. Did I read it correctly?

I'm going on the same dyno today with my smaller 20" inch wheels n newly installed flex fuel wire with different set up maps & boost. Will post results after that.

Bro, what boost chart on different RPM will u running with the highest power gain?

FP is only logged once the connector is added. Log seems fine. More boost would be nice but you might be at the limit of your setup as PWM is at 100%.

I'll modify the F series integrated firmware shortly to include these options. Then you'll use FUB = 2 with your map 6 if you want to stay with map 6.

bump

I didn't think the n55 had high pressure pumps any more. I know the dealer told me when I bought my new 435 it did not have a high pressure pump. Because of all the problems associated with them on the n54 motors.

Are u sure? It was live moving numbers on my jb4 mobile apps screen when I step on the gas meaning it is pumping the fuel.

Thanks, so after changing the FUB to 2. I still need to install the failsafe wire right or I don't need it anymore?

The boost target you can see in the csvs i posted.

So potentially I could fill with E60ish and run a custom map6 and just change the JB4 to map 2 or 5 if I need to fill up with normal pump fuel?

Looking forward to this firmware :)

I quess my sales and service advisers are idiots. I did some searches and found out we still have the high pressure pumps.

Just got back from the same dyno, manage to push another 42PS from Map 6 with different boost setting.

Old & New Dyno Chart.

3 Different Log:
Map 5: Seem to be very constant & smooth power at 300ps. (only did 2 run, didn't let it adapt for long enough, 2nd run the power was the same)
Map 6: Most powerful after the custom tune. ( gain another 42ps which is more than 50hp now at 336ps)
Map 7: Also very smooth n constant power at 327ps.
Map 0: With all my FBO at 276ps.
Stock N55 should be running not more than 230ps on the same dyno machine.

Hi Terry, can advise on the map 6 & why there is a lag around the 2700rpm?

Attached 3 log.

Logs seem fine. Too bad you can't find a dynojet machine to use as without that it's difficult to make comparisons.

Hi Terry, there are many dyno machine out there & will try to find one dynojet. Anyway to know why there is a lag or jerk in the 2700rpm & should I drop my boost towards the high RPM range so that the power will not drop so much up there. Was trying to rise boost further on the dyno but don't seem to be able to make anymore power so thinking of the other way round instead to lower the boost. Bcos when I compare the setting u sent to nick (boss sing) the top end power stay nicely thru out the higher range band. Is the adv timing self adjust by the jb4 or any timing range I need to look out for cos I always heard people talk about having methanol so we can adjust timing but in this case how do I do it?

2 boost setting attached.
Old map 6:
New map 6:

Didn't see anything around 2700rpm in the logs.

That was a fast respond. Thanks

How about timing & lowering the high range boost?

Without a back end flash we can't raise the timing max advance points. So if you can't make any more boost and timing is maxed out currently, you're out of ways to make more power.

Oh I see, thanks for your advice.