S54 E36 + CSL Intake = WIN! :)

[nebulous123]

We do have a PNP for daily driving. Since you're local we can do the wiring, or you can do it yourself with our wiring schematic. ;)

Are you guys keeping everything OBD2? How much for the PnP harness and how much for the schematic?

What are you guys charging these days for the Alpha-N tune or just a basic reprogram for daily use?

Also I can't seem to find an answer about getting this swap BAR-certified. I saw videos of you guys driving these cars on the street which makes me wonder if all is good for certification.

If someone could shed some light that would be helpful.

[DesertBMW]

dyno results are not valid if not done on a same day on same dyno, prior to installation of intake and tune vs. after.

You went from 288 peak HP to 317 peak HP, just on different intake and a tune? That is 29hp and to me that is hard to believe, stock intake is not restrictive and stock tune is not that bad.

Alpha N tune is meant for track cars only, because track car will stay in power band range trough out the driving event, like WOT and 5500 rpm to 8000 rpm, so the ecu can be tuned to give proper performance without air mass meter but at lower RPM range car basically runs in safe mode. But for a daily driver this will not be a practical idea, because DME is trying to predict how much air got into the engine by just going by fixed tune and not going by mass of the actual air.

[einstein57]

IRRC the car was never on a stock tune. It was originally on an alpha n tune for a carbon fiber intake manifold which did not work well with the factory airbox. Hence why the original numbers were so low.

[nando]

dyno results are not valid if not done on a same day on same dyno, prior to installation of intake and tune vs. after.

You went from 288 peak HP to 317 peak HP, just on different intake and a tune? That is 29hp and to me that is hard to believe, stock intake is not restrictive and stock tune is not that bad.

Alpha N tune is meant for track cars only, because track car will stay in power band range trough out the driving event, like WOT and 5500 rpm to 8000 rpm, so the ecu can be tuned to give proper performance without air mass meter but at lower RPM range car basically runs in safe mode. But for a daily driver this will not be a practical idea, because DME is trying to predict how much air got into the engine by just going by fixed tune and not going by mass of the actual air.

HakkenTT, you pretty much know nothing about MSS54, so just shut it.

hint: it has a built in MAP sensor..

[DesertBMW]

HakkenTT, you pretty much know nothing about MSS54, so just shut it.

hint: it has a built in MAP sensor..

I know enough that I tuned my own mss54hp for a swap. I also have alpha-n tunes and know what needs to be done. There is no 'built in' map sensor on the engine. There is barometric sensor built in the ECU, that reads the atmospheric pressures and not the intake manifold pressures.

This is from MSS54 training manual:

The Integrated Ambient Barometric Pressure Sensor of the MS S54 is part of the
ECM and is not serviceable. The internal sensor is supplied with 5 volts. In return it provides
a linear voltage of approx. 2.4 to 4.5 volts representative of barometric pressure (altitude).
The MS S54 monitors barometric pressure for the following reasons:
• The barometric pressure signal along with calculated air mass provides an additional correction
factor to further refine injection “on” time.
• Provides a base value to calculate the air mass being injected into the exhaust system by
the Secondary Air Injection System. This correction factor alters the secondary air injection
“on” time, optimizing the necessary air flow into the exhaust system.

[nando]

you may know now. also, I was speaking of the internal MAP sensor of the DME, not aux. the CSL *does* have an aux MAP sensor attached directly to the air pipe on the throttle bodies though.

[DesertBMW]

you may know now. also, I was speaking of the internal MAP sensor of the DME, not aux. the CSL *does* have an aux MAP sensor attached directly to the air pipe on the throttle bodies though.

You are correct. Pressure sensor 13627833561

I could not find any documentation on CSL because it was only two years of production and only for europe.

What I was talking about is that there is alpha N tune that works without that pressure sensor but the tune has to be tuned for each enviroment. Will not be a good idea for daily driving car

[ForcedFirebird]

Nice numbers, specially for stock cams.

[ForcedFirebird]

When using the MAP sensor, it is no longer Alpha-N, it's speed density. Alpha-N is strictly based on RPM vs TPS and calculated load. Our community has been tuning Alph-N on GM's for years, even boosted cars. Alpha-N actually means TPS (Alpha) and RPM (N).

[nando]

it's baro-corrected alpha-N. it can't measure engine load directly, it can only compensate for ambient conditions.

I found some stuff on the CSL, but one of the bigger S54 tuners told me that the CSL sensor doesn't actually do a whole lot, so it's probably not worth worrying about.

[ForcedFirebird]

Actually rereading your post, I see you said it's in the throttle pipe, not after the throttle plate...

Either way, it should be called a baro sensor, then, not a MAP (manifold absolute pressure) sensor.

[DesertBMW]

Actually rereading your post, I see you said it's in the throttle pipe, not after the throttle plate...

Either way, it should be called a baro sensor, then, not a MAP (manifold absolute pressure) sensor.

It is located on the "vacuum" tube, that goes to the brake booster. One could probably just use the line that goes to fuel pressure regulator as source for "vacuum/pressure sensor" . Nando is correct, it is MAP sensor because it measures the actual pressure of the manifold after throttle plates.

[ForcedFirebird]

It is located on the "vacuum" tube, that goes to the brake booster. One could probably just use the line that goes to fuel pressure regulator as source for "vacuum/pressure sensor" . Nando is correct, it is MAP sensor because it measures the actual pressure of the manifold after throttle plates.

So, in that case, it could be used the have speed density? Speed density is superior to MAF or Alpha-N, specially if it can read (or be modified to read) more than 1bar. MAF's are too susceptible to um-metered air, fail often, are sensitive to heat/moisture and can't recognize boost.

In the late GM stuff, most people disable the MAF in the tables and loosely use the MAP (not really full Alpha-N unless the MAP is disabled) - actually sounds like the BMW is doing something similar. The MAP is basically used for elevation, but can be used "kinda" for speed density, but still won't recognize boost.

If it is reading after the throttle, you are correct, it is a MAP. I am not overly familiar with the s54 ECU. Have one of the guys we race with (EPIC Motrorsports) who takes care of our OBDII and CAN tuning for the BMW's but have unlimited access to GM OBDII.

[nando]

yes it's after the throttle plate. MSS54's also have a MAP sensor built in (okay, I know it's not technically "MAP" but when i think of a sensor that measures pressure in relation to an engine, i use the word MAP, and they're often the exact same sensor model).

[ak-]

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