US v. UK 325i

GTS_330 · 01-12-2006, 12:48 PM

Quote:

Originally Posted by GTS_330

I think the reason why the US 325 is faster 0-60 is because of the torque curve.... usually bigger engine displacement have better torque curve!!!! Correct me if i'm wrong!!!!

.

voltron1011 · 01-12-2006, 01:12 PM

Quote:

Originally Posted by GTS_330

.

You are correct.... Torque is relative to displacement.
Horsepower is the ability of a motor to translate that torque to a given rev band.

jhbodle · 01-12-2006, 01:13 PM

For the automatic version, I agree with GTS330. But there doesn't seem to be much difference with the manual versions.

BimmerMan7 · 01-12-2006, 03:20 PM

As the US and EUR detuned E90 engines have a few minor engine changes, mostly different program maps for the fuel injection, reworked inlet ports etc. , I was wondering if there is a way (Electronically) then to bypass the settings for the detuned engines for the European 323 models, to produce higher HP (kW) outputs.

I'm sure I can take my car when out of warranty period to a Bosch/Siemens expert shop and they can re-program my 323 computer to produce nearly what the 325 model puts out in engine power. Any ideas on this ?

voltron1011 · 01-12-2006, 03:25 PM

I think the 323 motor is a carry-over, non-valvetronic E46 motor from last year. Although it is a 2.5 liter straight-six motor, it is not the same classification as the new E90 powerplants (N52?). I don't think there is much that can be done to up it's power.
I know Tierfreunde knows a lot about the differences between the two.

jhbodle · 01-12-2006, 04:54 PM

I believe that it's a detuned N52 2.5 Valvetronic from the Euro 325i. However, like the US 325i, it doesn't have the three stake intake that the UK 325 / US 330i does. That explains a lot of the difference in performance. You'd need this intake and an ECU remap to get the same power.

David328M-Sport · 01-12-2006, 04:59 PM

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

empowah · 01-12-2006, 05:07 PM

Here's why I think BMW went with the 3-liter 325i in the US:

* the US has no displacement taxes
* it's cheaper to build an engine without the 3-stage intake
* the performance stays about the same
* external engine size stays the same
* engine weight probably is reduced (fewer components)
* the fuel economy doesn't seem unduly affected
* more potential for modifications

jhbodle · 01-12-2006, 05:23 PM

Quote:

Originally Posted by David325Australia

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

Sure does.

voltron1011 · 01-12-2006, 05:53 PM

Quote:

Originally Posted by David325Australia

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

I totally agree.... I've owned close to 20 cars in the last 16 years, and this is by far the most rewarding.

carl_d · 01-13-2006, 02:51 AM

Quote:

Originally Posted by David325Australia

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

Same here. And is feels just as fast as my old E46 330i.

Krill · 01-13-2006, 03:06 AM

Quote:

Originally Posted by David325Australia

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

I Second that !!

Nothing beats the feeling of flooring it and shifting just at redline through all 6 gears

hmm... think I need to leave the office and run a few errands...

tctic · 01-13-2006, 04:13 AM

Quote:

Originally Posted by empowah

Here's why I think BMW went with the 3-liter 325i in the US:
* it's cheaper to build an engine without the 3-stage intake

Interesting Fact that I never heard of before. In this case, I am considering that a 2.5L with 3-stage intake would cost more than a 3.0L with single stage intake.

Tierfreund · 01-13-2006, 05:01 AM

Quote:

Originally Posted by voltron1011

I think the 323 motor is a carry-over, non-valvetronic E46 motor from last year. Although it is a 2.5 liter straight-six motor, it is not the same classification as the new E90 powerplants (N52?). I don't think there is much that can be done to up it's power.
I know Tierfreunde knows a lot about the differences between the two.

I´ve posted that statmement earlier, but I was mistaken. E90fleet corrected me. THe 323 is actually a N52 engine, not an M54, but with the single stage intake from the US 325 and the 2.5 Litre displacement from the Euro 325.

Sorry about the confusion.

JamieA · 01-13-2006, 09:26 AM

Quote:

Originally Posted by David325Australia

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

I concurr

ksquare · 02-09-2006, 09:47 AM

Quote:

Originally Posted by Tierfreund

I´ve posted that statmement earlier, but I was mistaken. E90fleet corrected me. THe 323 is actually a N52 engine, not an M54, but with the single stage intake from the US 325 and the 2.5 Litre displacement from the Euro 325.

Sorry about the confusion.

Just ordered a 323 (in Asia, HK). Am told by the dealer that the engine is the same as the 523. I'm no technical expert here but would really appreciate an explanation of difference between single stage intake and 3 stage intake. In simple English, if possible.

Also, would anyone have a torque graph for the 323? Would be interested in comparing it to the 325.

Thanks.

com_mander · 02-09-2006, 10:33 AM

Quote:

Originally Posted by E90Fleet

Actually Europe quote 0-62mph ( 0-100Km/h) and the USA show 0-60mph

so the extra time is for the extra 2mph

A really simple example clarifies this a lot:

Let's say:

0-60mph takes 6.0 seconds
then
0-62.5mph takes 6.25 seconds (i.e. 100km/h = 62.5mph)

and doing a little more math:

0-60mph in 6.7s
gives roughly
0-100km/h in 7.0 s (i.e 6.7s x 62.5/60 = 6.98s)

akhbhaat · 02-09-2006, 10:56 AM

Quote:

Originally Posted by com_mander

A really simple example clarifies this a lot:

Let's say:

0-60mph takes 6.0 seconds
then
0-62.5mph takes 6.25 seconds (i.e. 100km/h = 62.5mph)

and doing a little more math:

0-60mph in 6.7s
gives roughly
0-100km/h in 7.0 s (i.e 6.7s x 62.5/60 = 6.98s)

Some cars require an extra shift to hit 62 mph (100 km/h)...this is the usual reason for the difference.

JamieA · 02-11-2006, 10:14 AM

Quote:

Originally Posted by com_mander

A really simple example clarifies this a lot:

Let's say:

0-60mph takes 6.0 seconds
then
0-62.5mph takes 6.25 seconds (i.e. 100km/h = 62.5mph)

and doing a little more math:

0-60mph in 6.7s
gives roughly
0-100km/h in 7.0 s (i.e 6.7s x 62.5/60 = 6.98s)

Though you would be in the ballpark it is not an accurate way to calculate the 0-100km/h.

The amount of power required to go 1km/h faster increases exponentially as speed increases due to the air drag. This means that the 0-100km/h time could not be extraoplated from the 0-60mph time.

dynamics · 03-26-2006, 09:50 AM

Quote:

Originally Posted by David325Australia

No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old.

I'm sure the same goes with everyone else.

At 8 months, I still loves my 325 (2.5L with 218 hp) a lot. I get a high every time I rev. it pass 4000 rpm.

luckystrike · 03-26-2006, 01:51 PM

well its not purely marketing strategy, they have different engine specs on., one big reason for lesser tax and it means lesser cost of the car, means lots of people can buy it then.

just like here in austria gasoline have bigger tax and higher HP also have bigger tax.

StevoSEA · 03-26-2006, 03:26 PM

Quote:

Originally Posted by ksfrogman

Comparisons like this have always been interesting from a marketing standpoint. It would be even more interesting to be privy to the thoughts of the decision makers who determine which models do and don't appear in certain regions (e.g., why the 1-series, cloth or M-sport e90 models are not sold in the U.S.).

According to a person that I know who works for BMWNA, the reason we have not seen a 1 series in the U.S. is because BMW is concerned that a 1 series (coupe, hatch or sedan) will cut into MINI COOPER sales.

01-12-2006, 01:13 PM	#47
jhbodle Captain 146 Rep 898 Posts Drives: F90 M5 Join Date: Mar 2005 Location: UK iTrader: (0) Garage List 2007 E92 335i M-Spo ... [10.00] 2005 E90 325i SE (E ... [0.00]	For the automatic version, I agree with GTS330. But there doesn't seem to be much difference with the manual versions.
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01-12-2006, 03:20 PM	#48
BimmerMan7 Private 18 Rep 85 Posts Drives: 325i E90 Join Date: Nov 2005 Location: Pretoria, South Africa iTrader: (0)	Detuned Engines As the US and EUR detuned E90 engines have a few minor engine changes, mostly different program maps for the fuel injection, reworked inlet ports etc. , I was wondering if there is a way (Electronically) then to bypass the settings for the detuned engines for the European 323 models, to produce higher HP (kW) outputs. I'm sure I can take my car when out of warranty period to a Bosch/Siemens expert shop and they can re-program my 323 computer to produce nearly what the 325 model puts out in engine power. Any ideas on this ?
	Appreciate 0 Quote

01-12-2006, 03:25 PM	#49
voltron1011 Colonel 119 Rep 2,909 Posts Drives: 2011 135i, FJR-1300 Join Date: Apr 2005 Location: Wiesbaden iTrader: (2)	I think the 323 motor is a carry-over, non-valvetronic E46 motor from last year. Although it is a 2.5 liter straight-six motor, it is not the same classification as the new E90 powerplants (N52?). I don't think there is much that can be done to up it's power. I know Tierfreunde knows a lot about the differences between the two.
	Appreciate 0 Quote

01-12-2006, 04:54 PM	#50
jhbodle Captain 146 Rep 898 Posts Drives: F90 M5 Join Date: Mar 2005 Location: UK iTrader: (0) Garage List 2007 E92 335i M-Spo ... [10.00] 2005 E90 325i SE (E ... [0.00]	I believe that it's a detuned N52 2.5 Valvetronic from the Euro 325i. However, like the US 325i, it doesn't have the three stake intake that the UK 325 / US 330i does. That explains a lot of the difference in performance. You'd need this intake and an ECU remap to get the same power.
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01-12-2006, 04:59 PM	#51
David328M-Sport Brigadier General 101 Rep 3,566 Posts Drives: F30 M-Sport 328i Estoril Blue Join Date: Jun 2005 Location: Melbourne Australia iTrader: (0)	No matter how the figures are analysed, my 325 is an absolute pleasure to drive at any speed! I still smile every time I drive it and it's now 6 months old. I'm sure the same goes with everyone else. __________________ 328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect, MST turbo intake pipe, MST Cold Air Intake, JB4 on Map 2 with Catless DP produces awesome performance in Sport.
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01-12-2006, 05:07 PM	#52
empowah New Member 2 Rep 9 Posts Drives: E39 Join Date: Jan 2006 Location: Los Angeles, CA iTrader: (0)	Here's why I think BMW went with the 3-liter 325i in the US: * the US has no displacement taxes * it's cheaper to build an engine without the 3-stage intake * the performance stays about the same * external engine size stays the same * engine weight probably is reduced (fewer components) * the fuel economy doesn't seem unduly affected * more potential for modifications
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03-26-2006, 01:51 PM	#65
luckystrike First Lieutenant 18 Rep 349 Posts Drives: X3 F25 MSport Join Date: Mar 2006 Location: austria iTrader: (0)	well its not purely marketing strategy, they have different engine specs on., one big reason for lesser tax and it means lesser cost of the car, means lots of people can buy it then. just like here in austria gasoline have bigger tax and higher HP also have bigger tax.
	Appreciate 0 Quote