Water injection M2

Louzy77 · 10-06-2017, 07:38 PM

Has anyone tried this for the M2 and what has been your experience? I understand in the making of the M2 CS they are swapping the N55 for the S55 but can we through water cooling see similar gains to transform our cars to be CS like? Expert opinions much appreciated thank you!

zenmaster · 10-06-2017, 08:43 PM

I don't see how you can do better than the Bosch system, and they only claim 5% increase in performance. You may however be able to safely raise boost or hold it longer do to lower combustion temps. So maybe add another 5%. My guess it that with a tune, you could get around 360whp on 93oct with no other changes. The M2 CS will probably make 50whp more than that stock.

Louzy77 · 10-06-2017, 09:12 PM

Quote:

Originally Posted by zenmaster

I don't see how you can do better than the Bosch system, and they only claim 5% increase in performance. You may however be able to safely raise boost or hold it longer do to lower combustion temps. So maybe add another 5%. My guess it that with a tune, you could get around 360whp on 93oct with no other changes. The M2 CS will probably make 50whp more than that stock.

Thank you. So Bosch quotes a 5% increase but the M4 GTS goes from 425 to 500 with it and probably some retuning. I wonder whether for the M2 N55 with flash tunes like bootmod3 there would be an added advantage with water injection.

zenmaster · 10-07-2017, 05:11 AM

Quote:

Originally Posted by Louzy77

Thank you. So Bosch quotes a 5% increase but the M4 GTS goes from 425 to 500 with it and probably some retuning.

There is considerably more tuning headroom in the stock M4 S55, than in the stock M2 N55. M4 GTS power increase is ~5% water injection, ~7% tune.

The water injection also helps cool the combustion and thus keeps track temps down.

PackPride85 · 10-08-2017, 08:12 PM

Water injection on any motor not tuned for it won't give you any extra power. You'll just be able to go longer in heated conditions without losing any.

If you add combustion temp cooling you can usually start playing with the timing advance to find the maximum brake torque values at WOT. Most cars will stay slightly retarded from that max value from factory as a safety margin. If you have direct control of the wg you might be able to squeeze 1 or 2 more psi from a stock turbo in the top end and make small gains (at the expense of killing the turbo).

10-06-2017, 07:38 PM	#1
Louzy77 Enlisted Member 9 Rep 31 Posts Drives: BMW M2 Join Date: Sep 2016 Location: Singapore iTrader: (0)	Water injection M2 Has anyone tried this for the M2 and what has been your experience? I understand in the making of the M2 CS they are swapping the N55 for the S55 but can we through water cooling see similar gains to transform our cars to be CS like? Expert opinions much appreciated thank you!
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10-06-2017, 08:43 PM	#2
zenmaster Brigadier General 1577 Rep 3,888 Posts Drives: '17 M2 Join Date: Mar 2007 Location: Atlanta iTrader: (1)	I don't see how you can do better than the Bosch system, and they only claim 5% increase in performance. You may however be able to safely raise boost or hold it longer do to lower combustion temps. So maybe add another 5%. My guess it that with a tune, you could get around 360whp on 93oct with no other changes. The M2 CS will probably make 50whp more than that stock.
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10-08-2017, 08:12 PM	#5
PackPride85 Lieutenant Colonel 1120 Rep 1,644 Posts Drives: M2 Join Date: Sep 2014 Location: NC iTrader: (0)	Water injection on any motor not tuned for it won't give you any extra power. You'll just be able to go longer in heated conditions without losing any. If you add combustion temp cooling you can usually start playing with the timing advance to find the maximum brake torque values at WOT. Most cars will stay slightly retarded from that max value from factory as a safety margin. If you have direct control of the wg you might be able to squeeze 1 or 2 more psi from a stock turbo in the top end and make small gains (at the expense of killing the turbo).
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