[JunkStory]

The stock fan in the 335i is 600W. I have the opportunity to grab the upgraded 850W fan from a wreck 335is. Do you guys think it's a plug-and-play upgrade to the stock fan? I think this is an excellent, no-compromise method to improve cooling and longevity of the engine, even during daily driving.

According to the Bentley Manual, the fan is completely controlled by the ECM. Therefore, by theory, you would need the Performance Power Kit software in order to get new fan working. However, one guy from the other famous 335i forum said he dropped the 335is fan into his car and it works without the software. The problem is that I'm not sure if he's actually drawing 850W or just 600W.

Techies, any idea?

[BQTuning]

From what I have been told by countless people is that you need the PPK to run that fan if you want plug and play.

The PPK also included a new DME.

Perhaps that guy did drop one in his 335 but it could not have a bin plug and play. He must have done some wire plicing etc.

[Alessandro]

+1

[Turkeybaster115]

Originally Posted by JunkStory

The stock fan in the 335i is 600W. I have the opportunity to grab the upgraded 850W fan from a wreck 335is. Do you guys think it's a plug-and-play upgrade to the stock fan? I think this is an excellent, no-compromise method to improve cooling and longevity of the engine, even during daily driving.

I too saw the fan being sold from the wreck. I was very tempted, but chose not to jump on it, because:

1. I'm not sure its an uncomplicated plug and play
2. I need it for track use, and it might not do anything, cuz fans are useless after 35mph
3. These might actually be a more powerful, cheaper option. They also look like a guaranteed fit--> http://www.zirgo.com/
4. I'm afraid it might be too much of a drain on my battery. If I'm not mistaken, the 335is, and cars with the performance package, have an additional power source.

[JunkStory]

Originally Posted by Cynical

If the fan is completely controlled by the ECM then what makes you think the fans are even different?
I would think they are the same fans and more power (w) is just being pushed through.

Just a guess tho.
Like Maxcool mode on Jb4

They have different part #'s and the part name/description states different wattage.

Originally Posted by BuraQ

From what I have been told by countless people is that you need the PPK to run that fan if you want plug and play.

The PPK also included a new DME.

Perhaps that guy did drop one in his 335 but it could not have a bin plug and play. He must have done some wire plicing etc.

I'm inclined to think the same thing

Originally Posted by Turkeybaster115

I too saw the fan being sold from the wreck. I was very tempted, but chose not to jump on it, because:

1. I'm not sure its an uncomplicated plug and play
2. I need it for track use, and it might not do anything, cuz fans are useless after 35mph
3. These might actually be a more powerful, cheaper option. They also look like a guaranteed fit--> http://www.zirgo.com/
4. I'm afraid it might be too much of a drain on my battery. If I'm not mistaken, the 335is, and cars with the performance package, have an additional power source.

Yes, I think you're right. The 335is has different electrical system even different spark plugs, so I think it's a very complicated thing. Do you know if anyone with e90/e92 has tried the zirgo fan, and what size is our stock fan?

[Elie335]

subscribed, interesting thread

[bulldog_yyc]

IS Spark Plug
Spark plug, High Power BOSCH ZGR6STE2 12120037244
E9X (N54) Spark Plug
Spark plug, High Power BOSCH ZGR6STE2 12120037244

IS has the same spark plug as other N54 equipped cars. N55 has different spark plugs.

[rismo]

My tech looked up the differences between the first and second generation n54 (Second is IS and 1m and late x35's before n55 started)

The late x35's are after jan 2010.

The differences are:

Pistons
Pistons spring
Head
Engine block

All have updated part nr's. He did not check the smaller parts.
The Turbo and inlet manifold are untouched.

The engines are given the timeframe above all the same... so early 135/335 are completly similair.

Late 335/135/1m/is are all the same upto the start of the n55.

This is more or less inline with the forged piston discusion on the boards.

[jb's335]

So you are saying early 335i's do not have forged pistons and later (335is and 1m) do have forged pistons? And different heads/engine block? Please give more information or a link to said part numbers...

[JunkStory]

Early N54's are rumored to have forged internals. But this is way off topic... let's stick to the cooling fan discussion.

[JunkStory]

Originally Posted by Cynical

Wait, Isn't this the same
Fan that is included in the stage two BMW performance....?
If not then what is that fan?

It is the same fan as the one found in BMW PPK stage 2. I'm just wondering if it would work optimally without the stage 1 software.

[Turkeybaster115]

Originally Posted by rismo123

My tech looked up the differences between the first and second generation n54 (Second is IS and 1m and late x35's before n55 started)

The late x35's are after jan 2010.

The differences are:

Pistons
Pistons spring
Head
Engine block

All have updated part nr's. He did not check the smaller parts.
The Turbo and inlet manifold are untouched.

The engines are given the timeframe above all the same... so early 135/335 are completly similair.

Late 335/135/1m/is are all the same upto the start of the n55.

This is more or less inline with the forged piston discusion on the boards.

*I apologize to the op in advance cuz, this is off topic*

WOW! Ever since reading the thread on forged pistons, I've suspected that the 335is/1M/Late N54/N55 had cast iron pistons, but was hoping that the 335is/1M were at least spared the cost cutting measure. But, this pretty much confirms my suspicion. Its pretty sad that BMW did this. Also, The change actually seemed to have happened late 2008.

[kaleb]

Not CAST IRON.... CAST ALUMINUM. There are no cast iron pistons in modern production cars.

[Zeph]

Interested as well, I have considered uprading just the fan but according to this thread I don't believe that will be an option? I just don't want the extra radiator hoses and heat exchanger, nor the tune really (nor the cost...) I just wanted a better cooling fan.

P.S. We are really running 500 HP cars without forged internals? I always just assumed... jeez that is scary!

Zeph

[onebadmofo]

I have the fan from IS on my 335i. In fact I'm the guy that was selling it (still do).
It's a direct swap. The IS uses a harness with a relay that's feeding directly from the positive terminal in the engine bay. I connected the fan directly to the stock harness (it has 8ga wire) with no issues.

Coolant temperature is slightly lower now at idle. I idled for an hour with AC on and the temp was 198-202F, usually I'd have 212-220 at conditions like that. I do not know if it draws all the 850watts but it's much louder than stock fan and sucks so much air I had dry leaves stuck to my kidney grills

[Turkeybaster115]

Originally Posted by onebadmofo

I have the fan from IS on my 335i. In fact I'm the guy that was selling it (still do).
It's a direct swap. The IS uses a harness with a relay that's feeding directly from the positive terminal in the engine bay. I connected the fan directly to the stock harness (it has 8ga wire) with no issues.

Coolant temperature is slightly lower now at idle. I idled for an hour with AC on and the temp was 198-202F, usually I'd have 212-220 at conditions like that. I do not know if it draws all the 850watts but it's much louder than stock fan and sucks so much air I had dry leaves stuck to my kidney grills

Then why are you selling it?

[onebadmofo]

I don't race my car.

[Skydive]

Originally Posted by onebadmofo

I have the fan from IS on my 335i. In fact I'm the guy that was selling it (still do).
It's a direct swap. The IS uses a harness with a relay that's feeding directly from the positive terminal in the engine bay. I connected the fan directly to the stock harness (it has 8ga wire) with no issues.

Coolant temperature is slightly lower now at idle. I idled for an hour with AC on and the temp was 198-202F, usually I'd have 212-220 at conditions like that. I do not know if it draws all the 850watts but it's much louder than stock fan and sucks so much air I had dry leaves stuck to my kidney grills

Can you share the OE part number?

[Turkeybaster115]

Originally Posted by onebadmofo

I don't race my car.

How do you know it helps racing?

[Turkeybaster115]

Originally Posted by kaleb

Not CAST IRON.... CAST ALUMINUM. There are no cast iron pistons in modern production cars.

NO, they are CAST IRON!! Only Cast Iron pistons can stand high temperatures, read:

http://books.google.com/books?id=DoY...atures&f=false

Disadvantages of aluminum pistons

1. Not as strong as cast iron, particularly at high temperatures
2. Aluminum pistons are MORE EXPENSIVE than cast Iron

Cast iron


Forged

[rismo]

Originally Posted by Turkeybaster115

*I apologize to the op in advance cuz, this is off topic*

WOW! Ever since reading the thread on forged pistons, I've suspected that the 335is/1M/Late N54/N55 had cast iron pistons, but was hoping that the 335is/1M were at least spared the cost cutting measure. But, this pretty much confirms my suspicion. Its pretty sad that BMW did this. Also, The change actually seemed to have happened late 2008.

The changes are confirmed for jan 2010. I have a 02-2008 build car and have the former parts.

If you have detailed questions, post them and I will do my best to get some answers, but no promisses.

[onebadmofo]

Originally Posted by Skydive

Can you share the OE part number?

http://www.e90post.com/forums/showthread.php?t=587781