Turbo kick @ 2500 RPM - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

racer_x · 02-03-2013, 03:23 AM

Hi Guys,

Please forgive the noob questions. I am new to these turbo BMs.

I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms.

It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning?

Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine?

Thanks in advance.

pavo335 · 02-03-2013, 03:30 AM

Quote:

Originally Posted by racer_x

Hi Guys,

Please forgive the noob questions. I am new to these turbo BMs.

I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms.

It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning?

Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine?

Thanks in advance.

Did it have meth?

JB4135 · 02-03-2013, 04:02 AM

LOL at pavo.....meth

I bet the seller has a piggy back tune already on the car so it could be running around 13-14psi compared to the stock 8psi. These cars have a lot of torque especially when running a little more boost. Power does come on quite strong when the turbos spool up.

TS135i · 02-03-2013, 04:03 AM

I have driven three of these cars and all three felt different, I'll be driving a forth next month with PPK so I'm guessing it will feel different again.

sparoz · 02-03-2013, 04:12 AM

Quote:

Originally Posted by racer_x

Hi Guys,

Please forgive the noob questions. I am new to these turbo BMs.

I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms.

It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning?

Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine?

Thanks in advance.

No, it doesn't drive like a N/A - that's the point

of a turbo. You might have it confused with the response is very close to a N/A. However, never got that in my 135i before, but with the 1M stock tune it was noticeable when the overboost kicks in. It almost felt like it is running out of steam and all of a sudden you get more boost.

I had a ESS tune which gives a much more linear delivery of power.

I suspect the example you were driving has a tune and not tuned very well.

Jeef Beef · 02-03-2013, 04:12 AM

You must've hit VTEC

racer_x · 02-03-2013, 04:30 AM

Quote:

Originally Posted by Jeef Beef

You must've hit VTEC

That's what it reminded me of... My mate's S2000. Except this was much lower in the rev range.

racer_x · 02-03-2013, 05:23 AM

Quote:

Originally Posted by JB4135

LOL at pavo.....meth

I bet the seller has a piggy back tune already on the car so it could be running around 13-14psi compared to the stock 8psi. These cars have a lot of torque especially when running a little more boost. Power does come on quite strong when the turbos spool up.

According to the seller, the car is stock. Unmolested.

I read somewhere that BMW USA was flashing the N54 ECUs with some weird tune which introduced more lag to add to the longevity of the HPFP, could this be the case here?

Dackelone · 02-03-2013, 06:22 AM

Quote:

Originally Posted by racer_x

According to the seller, the car is stock. Unmolested.

I read somewhere that BMW USA was flashing the N54 ECUs with some weird tune which introduced more lag to add to the longevity of the HPFP, could this be the case here?

Yup. For N55's too. The SW update also includes some anti-tuner stuff too, besides the added "lag" tune. Basically, when you unlock the car... if you start to hear the LPFP (low pressure fuel pump) the car has that SW update. Early cars did not do that.

Dack

sbce90 · 02-03-2013, 07:26 AM

Quote:

Originally Posted by Jeef Beef

You must've hit VTEC

na Lift!

John_01 · 02-03-2013, 07:48 AM

My N55 has very smooth torque delivery. Torque feels like it gradually builds to 2000RPM and pretty constant for most of the rev range. It certainly isn't missing any bottom end torque. To me the top-end feels a bit of a disappointment by comparison.

Pig Farmer · 02-03-2013, 09:29 AM

If the car is not tuned, I think Dack is spot on. BMW's updated software flash introduced some serious lag below 2200-2500 rpm. In order to get the same response as before, you would need to double your throttle inputs. The PPK corrects this issue and gives you a very linear torque curve and immediate throttle response. The PPK is not the most powerful tune but power delivery is very predictable.

Rukuss · 02-03-2013, 09:07 PM

Quote:

Originally Posted by Pig Farmer

If the car is not tuned, I think Dack is spot on. BMW's updated software flash introduced some serious lag below 2200-2500 rpm. In order to get the same response as before, you would need to double your throttle inputs. The PPK corrects this issue and gives you a very linear torque curve and immediate throttle response. The PPK is not the most powerful tune but power delivery is very predictable.

Does Cobb correct this too?

Pig Farmer · 02-03-2013, 09:18 PM

I'm not sure. Every car seems to respond a little different. A number of people have mentioned that both the Cobb and JB4 tend to surge a bit when the boost dials up. Some people claim that they don't experience any surge. That being said, the stage 2 Dinan and GIAC tunes seem to get the best reviews when it comes to smooth power delivery but they are not cheap and require a dealer to flash the ECU.

Jeef Beef · 02-03-2013, 09:37 PM

Any sort of tune that increases your power substantially should result in more 'surge' as you describe. This is simply because the turbos will take a bit longer to reach the higher boost level.

racer_x · 02-06-2013, 05:13 AM

I drove an 09 model (stock, no mods) tonight and it was noticeably smoother. The seller tells me that the HPFP and the injectors were replaced as a precaution under warranty. He was not sure if they upgraded the ECU firmware or not.

Wrniknbl · 02-06-2013, 05:28 AM

Just had my fmic and charge pipe upgraded surge is now one looong pull - best of all I have stock DP - so I know it's only gonna get better!

02-03-2013, 03:23 AM	#1
racer_x Private First Class Drives: When He Has To Join Date: Jan 2013 Location: Sydney Posts: 126 iTrader: (0)	Turbo kick @ 2500 RPM Hi Guys, Please forgive the noob questions. I am new to these turbo BMs. I test drove my first 135i today and noticed the car was not as smooth as I expected when accelerating. The car is a 2008 model with @ 50,000 kms. It seemed to me that around 2500 the turbos kick in noticeably. The car did not seem to be down on power or anything but it was not a smooth build up of power as the revs rose. Is this normal? Or does it need tuning? Please forgive my ignorance but I've not driven a lot of 6 cylinder turbos. I was expecting a power deliver similar to a normally aspirated engine? Thanks in advance.
	Tweet

02-03-2013, 04:02 AM	#3
JB4135 Colonel Drives: E92 BSM & E91 BSM Join Date: Feb 2011 Location: Australia Posts: 2,364 iTrader: (1)	LOL at pavo.....meth I bet the seller has a piggy back tune already on the car so it could be running around 13-14psi compared to the stock 8psi. These cars have a lot of torque especially when running a little more boost. Power does come on quite strong when the turbos spool up. __________________ JB4 G5

02-03-2013, 04:03 AM	#4
TS135i Private First Class Drives: 2013 BMW 135i Join Date: Jan 2013 Location: Sydney Posts: 196 iTrader: (0)	I have driven three of these cars and all three felt different, I'll be driving a forth next month with PPK so I'm guessing it will feel different again. __________________ 135i Coupe PPK N55

02-03-2013, 04:12 AM	#6
Jeef Beef Lord Captain Commander Drives: a sleeper Join Date: Oct 2009 Location: Sydney, Australia Posts: 3,022 iTrader: (0)	You must've hit VTEC __________________ E82 135i M-sport: SGM/6MT/Black PROcede V5 \| BMS DCI \| AR Catless DPs \| BMW PE \| ER CP \| HKS BOV \| BMW SSK \| KW V1 coilovers \| Dunlop Direzza Star Specs \| GTC-CX Matte Black 18" \| GP Thunder 7500K \| Kerscher CF Lip

02-03-2013, 09:37 PM	#15
Jeef Beef Lord Captain Commander Drives: a sleeper Join Date: Oct 2009 Location: Sydney, Australia Posts: 3,022 iTrader: (0)	Any sort of tune that increases your power substantially should result in more 'surge' as you describe. This is simply because the turbos will take a bit longer to reach the higher boost level. __________________ E82 135i M-sport: SGM/6MT/Black PROcede V5 \| BMS DCI \| AR Catless DPs \| BMW PE \| ER CP \| HKS BOV \| BMW SSK \| KW V1 coilovers \| Dunlop Direzza Star Specs \| GTC-CX Matte Black 18" \| GP Thunder 7500K \| Kerscher CF Lip

02-03-2013, 07:48 AM	#11
John_01 Lieutenant Colonel Drives: E90 325i, E82 135i Join Date: Mar 2009 Location: Sydney, Australia Posts: 1,675 iTrader: (0)	My N55 has very smooth torque delivery. Torque feels like it gradually builds to 2000RPM and pretty constant for most of the rev range. It certainly isn't missing any bottom end torque. To me the top-end feels a bit of a disappointment by comparison.

02-03-2013, 09:29 AM	#12
Pig Farmer Lieutenant Drives: 2009 BMW 135i Join Date: May 2010 Location: Florida Posts: 489 iTrader: (0)	If the car is not tuned, I think Dack is spot on. BMW's updated software flash introduced some serious lag below 2200-2500 rpm. In order to get the same response as before, you would need to double your throttle inputs. The PPK corrects this issue and gives you a very linear torque curve and immediate throttle response. The PPK is not the most powerful tune but power delivery is very predictable.

02-03-2013, 09:18 PM	#14
Pig Farmer Lieutenant Drives: 2009 BMW 135i Join Date: May 2010 Location: Florida Posts: 489 iTrader: (0)	I'm not sure. Every car seems to respond a little different. A number of people have mentioned that both the Cobb and JB4 tend to surge a bit when the boost dials up. Some people claim that they don't experience any surge. That being said, the stage 2 Dinan and GIAC tunes seem to get the best reviews when it comes to smooth power delivery but they are not cheap and require a dealer to flash the ECU.

02-06-2013, 05:13 AM	#16
racer_x Private First Class Drives: When He Has To Join Date: Jan 2013 Location: Sydney Posts: 126 iTrader: (0)	I drove an 09 model (stock, no mods) tonight and it was noticeably smoother. The seller tells me that the HPFP and the injectors were replaced as a precaution under warranty. He was not sure if they upgraded the ECU firmware or not.

02-06-2013, 05:28 AM	#17
Wrniknbl It's just not cricket Drives: 135i N55 Join Date: Jul 2012 Location: Aus Posts: 49 iTrader: (0)	Just had my fmic and charge pipe upgraded surge is now one looong pull - best of all I have stock DP - so I know it's only gonna get better!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search