E90 LCI 318/320 ecu tuning
- Thread starter wt_know
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pbear1973
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
It's probably the way the bhp is measured. Bimmer probably measures it on an engine dyno. I.e. a dyno with the load connected directly to the output shaft of the engine. All the dynos done here are chassis dynos, which measure power at the wheels and then use some sort of mathematical model to back-calculate the engine power. In addition to an imperfect model, chassis dynos probably suffer from other losses as well like wheel slippage, loss of power through the torque converter etc.
Hence the vastly different values. If you can get 150+ bhp on a chassis dyno, you have a real keeper.
KSE90;591436 said:
It's probably the way the bhp is measured. Bimmer probably measures it on an engine dyno. I.e. a dyno with the load connected directly to the output shaft of the engine. All the dynos done here are chassis dynos, which measure power at the wheels and then use some sort of mathematical model to back-calculate the engine power. In addition to an imperfect model, chassis dynos probably suffer from other losses as well like wheel slippage, loss of power through the torque converter etc.
Hence the vastly different values. If you can get 150+ bhp on a chassis dyno, you have a real keeper.
Re: E90 LCI 318/320 ecu tuning
Just to make sure i understand all these technical terms correctly. are you saying, theoretically & technically all bimmers should have the bhp as advertised. But different measurement methods derive to different result...,
pbear1973;591461 said:It's probably the way the bhp is measured. Bimmer probably measures it on an engine dyno. I.e. a dyno with the load connected directly to the output shaft of the engine. All the dynos done here are chassis dynos, which measure power at the wheels and then use some sort of mathematical model to back-calculate the engine power. In addition to an imperfect model, chassis dynos probably suffer from other losses as well like wheel slippage, loss of power through the torque converter etc.
Hence the vastly different values. If you can get 150+ bhp on a chassis dyno, you have a real keeper.
Just to make sure i understand all these technical terms correctly. are you saying, theoretically & technically all bimmers should have the bhp as advertised. But different measurement methods derive to different result...
,
pengful
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
See if this makes sense to you... http://www.bmw-sg.com/forums/engine...tuned-jerk-before-stop-gone-2.html#post590832
KSE90;591466 said:Just to make sure i understand all these technical terms correctly. are you saying, theoretically & technically all bimmers should have the bhp as advertised. But different measurement methods derive to different result...
See if this makes sense to you... http://www.bmw-sg.com/forums/engine...tuned-jerk-before-stop-gone-2.html#post590832
pbear1973
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
Makes sense.. also as an engineer I cannot see how you can accurately estimate flywheel hp based on readings taken from the wheels. There's too much variability and randomness in everything between the dyno and the engine. Slippage between the wheel and the dyno, losses in the differential, drive shaft, gearbox, etc. My guess is that the model used to estimate the engine figures are just based on typical figures.
I'm guessing that bimmer should be fairly accurate - give or (more likely) take 10 bhp - in their numbers, seeing that they never got into the trouble that Ford and Mazda did.
To also answer your question in that other thread; yeah my jerk-before-stop is gone too.
pengful;591528 said:
Makes sense.. also as an engineer I cannot see how you can accurately estimate flywheel hp based on readings taken from the wheels. There's too much variability and randomness in everything between the dyno and the engine. Slippage between the wheel and the dyno, losses in the differential, drive shaft, gearbox, etc. My guess is that the model used to estimate the engine figures are just based on typical figures.
I'm guessing that bimmer should be fairly accurate - give or (more likely) take 10 bhp - in their numbers, seeing that they never got into the trouble that Ford and Mazda did.
To also answer your question in that other thread; yeah my jerk-before-stop is gone too.
Re: E90 LCI 318/320 ecu tuning
Well well, this is easier for a layman like to me to understand. Thanks!
More practical way to feel the differences is to pay "school fees" to whoever the tuner i will be going to when i do get my ride
Cheers.
pbear1973;591540 said:Makes sense.. also as an engineer I cannot see how you can accurately estimate flywheel hp based on readings taken from the wheels. There's too much variability and randomness in everything between the dyno and the engine. Slippage between the wheel and the dyno, losses in the differential, drive shaft, gearbox, etc. My guess is that the model used to estimate the engine figures are just based on typical figures.
I'm guessing that bimmer should be fairly accurate - give or (more likely) take 10 bhp - in their numbers, seeing that they never got into the trouble that Ford and Mazda did.
To also answer your question in that other thread; yeah my jerk-before-stop is gone too.
Well well, this is easier for a layman like to me to understand. Thanks!
More practical way to feel the differences is to pay "school fees" to whoever the tuner i will be going to when i do get my ride
Cheers.
pbear1973
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
Haha you're welcome. It might not be 100% correct though since I'm a computer engineer, not an automotive engineer. Lol.
Boss Automotive has gotten very famous for their ECU tuning, particularly for the 318i and 320i. I've noticed increasing gains in the latest tuning figures. I got my ECU tuned there (in fact it's the FIRST 320i LCI tuned by them.. haha) and I'm extremely happy.. especially when coupled with all my other mods.
For the 6-potters Boss is famous for their Powerbox piggy-back ECUs.
KSE90;591551 said:Well well, this is easier for a layman like to me to understand. Thanks!
More practical way to feel the differences is to pay "school fees" to whoever the tuner i will be going to when i do get my ride
Cheers.
Haha you're welcome. It might not be 100% correct though since I'm a computer engineer, not an automotive engineer. Lol.
Boss Automotive has gotten very famous for their ECU tuning, particularly for the 318i and 320i. I've noticed increasing gains in the latest tuning figures. I got my ECU tuned there (in fact it's the FIRST 320i LCI tuned by them.. haha) and I'm extremely happy.. especially when coupled with all my other mods.
For the 6-potters Boss is famous for their Powerbox piggy-back ECUs.
pbear1973
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
Bro could you check the label on the driver side door on your engine type? It should look like N46B20B or N46NB20 or something along those lines. Post it here and we'll be able to tell you your advertised bhp and torque.
firehorse;591776 said:
Bro could you check the label on the driver side door on your engine type? It should look like N46B20B or N46NB20 or something along those lines. Post it here and we'll be able to tell you your advertised bhp and torque.
Re: E90 LCI 318/320 ecu tuning
The label shown N46B20B
Here is the Dyno Chart
View attachment 29253
View attachment 29254
The label shown N46B20B
Here is the Dyno Chart
View attachment 29253
View attachment 29254
Re: E90 LCI 318/320 ecu tuning
The label shown is N46B20B
Here is the Dyno Chart
View attachment 29255
View attachment 29256
The label shown is N46B20B
Here is the Dyno Chart
View attachment 29255
View attachment 29256
pbear1973
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
Awesome bro, you really, really have a keeper here! The N46B20B is rated at 156bhp.. your stock is off by just a few bhp and now your tuned engine is more powerful than the N46NB20.
Wishing you many many years of great driving with this baby!
firehorse;592245 said:
Awesome bro, you really, really have a keeper here! The N46B20B is rated at 156bhp.. your stock is off by just a few bhp and now your tuned engine is more powerful than the N46NB20.
Wishing you many many years of great driving with this baby!
wt_know
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
how come your N46B20 so powderful. does it comes with sprint booster .... hehe
congrats and enjoy your juiced engine ... fastest 320 in town ?
stock dyno is 153bhp/212Nm ... BMW gives you additional 12Nm for free ....
how come your N46B20 so powderful. does it comes with sprint booster .... hehe
congrats and enjoy your juiced engine ... fastest 320 in town ?
stock dyno is 153bhp/212Nm ... BMW gives you additional 12Nm for free ....
Last edited by a moderator:
ed6141
Well-Known Member
Re: E90 LCI 318/320 ecu tuning
Bro,
Despite the car age, your car is probably more powerful then a lot of new cars. Notice that your both your torque and power curve, didn't even shift left, probably because it is already near its optimal level. Envy you man.
firehorse;592245 said:
Bro,
Despite the car age, your car is probably more powerful then a lot of new cars. Notice that your both your torque and power curve, didn't even shift left, probably because it is already near its optimal level. Envy you man.
