325i Mods and dyno

MatteoC · 01-10-2017, 08:31 AM

Hello Guys!
This week I have done some mods to my N52 2006 325i.
For the moment I did the full exhaust (headers and all the way back to the tips).
Have done the custom work in a local exhaust shop, and bought the headers on eBay.
I made some runs with the stock car on a Superflow dyno and got 231hp at the crank, it should be 218hp right? made several runs with exact same result, don't know where may the difference be.
After the exhaust install I repeated the runs with stock ECU file, it Improved a lot, but in high RPM I have measured lean AFR values so reprogrammed the ECU to make it a little richer. After that the gain was of about 6hp in the higher RPMs range.
In conclusion I'm very happy with the results but cannot explain the difference in stock power, and also how much will the 3 Stage Intake manifold improve these numbers.
What experience do you have with this?

About the graphs:
Red one is all stock and it peaked at 231HP, dont remember exact torque number.
Blue one is with the complete exhaust system, and a light remapping.

Planning on doing some more work on ECU maps later!

Cheers!

Taskmaster · 01-10-2017, 08:56 AM

You should speak to hassmaschine about buying a DME with a tune preinstalled for you - but NICE work so far, I see they let off early before redline.

matthewjmoser · 01-10-2017, 10:00 AM

Sound clip? I'm maybe interested in purchasing the ebay headers hmm. how was the fit?

weehe126 · 01-10-2017, 10:23 AM

Is that what all aftermarket headers look like? That O2 sensor placement only allows cylinder 2 and 5 AFR to be read.

Taskmaster · 01-10-2017, 10:49 AM

Quote:

Originally Posted by weehe126

Is that what all aftermarket headers look like? That O2 sensor placement only allows cylinder 2 and 5 AFR to be read.

Not mine. And I don't like that at all.

STR8-6IX · 01-10-2017, 11:57 AM

change out those 325i rims

install a 3 stage manifold and tune.

Mike. · 01-10-2017, 01:12 PM

Quote:

Originally Posted by 6IX-F10-N52

change out those 325i rims

install a 3 stage manifold and tune.

so you're telling to people to get a tune, yet you want piece of mind knowing that everything will be okay if you get a tune?! That doesn't sound right

Bruh

W37V · 01-10-2017, 01:15 PM

Quote:

Originally Posted by Mike.

so you're telling to people to get a tune, yet you want piece of mind knowing that everything will be okay if you get a tune?! That doesn't sound right

Bruh

What are you talking about? It makes perfect sense. You are the one who makes no sense. Welcome to the opposite world.

Noir · 01-10-2017, 01:37 PM

Rad

tlow98 · 01-10-2017, 09:40 PM

Quote:

Originally Posted by W37V

What are you talking about? It makes perfect sense. You are the one who makes no sense. Welcome to the opposite world.

You are up. We are down. Sasketchawan is not real madonna.

alx. · 01-11-2017, 08:03 AM

Looks awesome, how did you deal with the CEL light from the post cat o2s?

STR8-6IX · 01-11-2017, 03:53 PM

Quote:

Originally Posted by tlow98

You are up. We are down. Sasketchawan is not real madonna.

how high are you?

alx. · 01-11-2017, 06:01 PM

Quote:

Originally Posted by 6IX-F10-N52

how high are you?

STR8-6IX · 01-11-2017, 06:26 PM

Quote:

Originally Posted by alx.

excellent

e90dum · 01-11-2017, 08:04 PM

Quote:

Originally Posted by Mike.

so you're telling to people to get a tune, yet you want piece of mind knowing that everything will be okay if you get a tune?! That doesn't sound right

Bruh

Someone's gotta parrot the hivemind, otherwise how would i feel like I'm helping

ps thanks for the template mike

Mike. · 01-11-2017, 08:15 PM

Quote:

Originally Posted by e90dum

Quote:

Originally Posted by Mike.

so you're telling to people to get a tune, yet you want piece of mind knowing that everything will be okay if you get a tune?! That doesn't sound right

Bruh

Someone's gotta parrot the hivemind, otherwise how would i feel like I'm helping

ps thanks for the template mike

hahah

Wait..template for? I'm lost help Haha

MatteoC · 01-23-2017, 08:08 AM

Quote:

Originally Posted by weehe126

Is that what all aftermarket headers look like? That O2 sensor placement only allows cylinder 2 and 5 AFR to be read.

No, AA headers look similar but have O2 sensor position down where pipes are united. Yes this position may not be the best but have made several dyno runs with an external datalog in the exhaust and AFRs where fine.

MatteoC · 01-23-2017, 08:11 AM

Quote:

Originally Posted by matthewjmoser

Sound clip? I'm maybe interested in purchasing the ebay headers hmm. how was the fit?

Will do a sound clip, to show. With stock exhaust the sound changed very little.
About the fitment it wasnt thaat good, one of the headers touched the engine mount so the fitment wasn't possible had to modify the exhaust.

MatteoC · 01-23-2017, 08:13 AM

Quote:

Originally Posted by TheAxiom

You should speak to hassmaschine about buying a DME with a tune preinstalled for you - but NICE work so far, I see they let off early before redline.

Yeah thanks, for the moment I am working with a local workshop

Eagle1oh7 · 01-24-2017, 08:19 AM

I take it your car is AT?

hassmaschine · 01-24-2017, 12:25 PM

BTW, that chart almost certainly estimated BHP, not WHP.

nice job though! It's worth the effort. Every time I drive the E91 now, I no longer miss the power of my 330i (well, maybe a little - it's still heavier/slower, but I'm not often racing anyone with the wife and kids in tow).

CobraMarty · 01-24-2017, 05:31 PM

Something is wrong with that dyno graph.

HP and TQ must cross at 5252 rpm by definition.

01-10-2017, 08:31 AM	#1
MatteoC Private 28 Rep 52 Posts Drives: 2006 E90 325i Join Date: Jul 2015 Location: Uruguay iTrader: (1)	325i Mods and dyno Hello Guys! This week I have done some mods to my N52 2006 325i. For the moment I did the full exhaust (headers and all the way back to the tips). Have done the custom work in a local exhaust shop, and bought the headers on eBay. I made some runs with the stock car on a Superflow dyno and got 231hp at the crank, it should be 218hp right? made several runs with exact same result, don't know where may the difference be. After the exhaust install I repeated the runs with stock ECU file, it Improved a lot, but in high RPM I have measured lean AFR values so reprogrammed the ECU to make it a little richer. After that the gain was of about 6hp in the higher RPMs range. In conclusion I'm very happy with the results but cannot explain the difference in stock power, and also how much will the 3 Stage Intake manifold improve these numbers. What experience do you have with this? About the graphs: Red one is all stock and it peaked at 231HP, dont remember exact torque number. Blue one is with the complete exhaust system, and a light remapping. Planning on doing some more work on ECU maps later! Cheers!
	Appreciate 1 Taskmaster2470.50 Tweet Quote

01-10-2017, 08:56 AM	#2
Taskmaster Banned 2471 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	You should speak to hassmaschine about buying a DME with a tune preinstalled for you - but NICE work so far, I see they let off early before redline.
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01-10-2017, 10:00 AM	#3
matthewjmoser Second Lieutenant 56 Rep 294 Posts Drives: 2011 328xi Join Date: Feb 2015 Location: Long Island iTrader: (0)	Sound clip? I'm maybe interested in purchasing the ebay headers hmm. how was the fit?
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01-10-2017, 10:23 AM	#4
weehe126 Brigadier General 1188 Rep 3,221 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Is that what all aftermarket headers look like? That O2 sensor placement only allows cylinder 2 and 5 AFR to be read.
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01-10-2017, 11:57 AM	#6
STR8-6IX Banned 550 Rep 2,825 Posts Drives: RWD 528i N52 Join Date: Nov 2016 Location: Toronto iTrader: (0)	change out those 325i rims install a 3 stage manifold and tune.
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01-10-2017, 01:37 PM	#9
Noir Major 893 Rep 1,413 Posts Drives: 2006 E90 330i 6MT Join Date: Aug 2016 Location: San Antonio iTrader: (1)	Rad
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01-11-2017, 08:03 AM	#11
alx. Second Lieutenant 41 Rep 210 Posts Drives: F30 320iA M Sport Join Date: Nov 2015 Location: Bucharest iTrader: (0) Garage List 2006 e90 325i [0.00]	Looks awesome, how did you deal with the CEL light from the post cat o2s? __________________ Bmw e46 320d '04 - Sold Bmw e46 330ci '01 - Sold Bmw 3-er e90 325i '06 - Sold Bmw 3-er e92 325xi '08 - Sold
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01-24-2017, 08:19 AM	#20
Eagle1oh7 Lieutenant Colonel 289 Rep 1,710 Posts Drives: '11 328i Sedan Join Date: Oct 2012 Location: Chula Vista CA iTrader: (0)	I take it your car is AT? __________________ DONE: Seibon CF Hood, M3 Rep, MSport rear w/DD CF Diffuser, M3 Rep Skirts, Seibon CSL trunklid, Forgestar F14 18s w/Michelin PSS, Eisenmann catback, AA Headers, BPC Stage 2, Charcoal Delete+revMotor+AFE Drop In filter FUTURE MODS: LED headlights, CF rooftop, M3 Suspension Conversion, Dinan CAI Mod
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01-24-2017, 12:25 PM	#21
hassmaschine Major General 3980 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	BTW, that chart almost certainly estimated BHP, not WHP. nice job though! It's worth the effort. Every time I drive the E91 now, I no longer miss the power of my 330i (well, maybe a little - it's still heavier/slower, but I'm not often racing anyone with the wife and kids in tow).
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01-24-2017, 05:31 PM	#22
CobraMarty Major 622 Rep 1,402 Posts Drives: 2007 328xi e90 + e92 Join Date: Sep 2010 Location: BimmerMILVs.com iTrader: (7)	Something is wrong with that dyno graph. HP and TQ must cross at 5252 rpm by definition.
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