High Rev

[wt_know]

Model: E90 320

RPM 1K < x < 4K = very smooth, can feel the engine punching with nice sound

RPM 4K < x < 6K = out of breath, can feel the engine struggling

RPM Redline = 6.5K

based on paper specs

156 bhp / 6,400 RPM
200 Nm / 3,600 RPM

does that mean at 3,600 RPM, the torque max out and it makes no difference to rev any higher ?

i did the high rev each time when i enter expressway and there is no car. i rev high from lane 3 to lane 1 (that's my 0-100 sprint )

any suggestion for improvement ?

 

[leebmer]

Re: High Rev

1) can change the engine oil at shorter and regular intervals..like every 7000km (max 10000km)..so that engine can rev more freely..
2) install intake that is quite loud and shiok so that u get distracted by it rather than focus on the engine sound..
3) turn up the music volume..
4) have a chio passenger..

 

[jinooi]

Re: High Rev

erm... what is it exactly that you are trying to achieve?

faster 0-100kmh sprint?

cos that's what torque is all about - acceleration.

 

[wt_know]

Re: High Rev

thanks for your suggestions

1) can change the engine oil at shorter and regular intervals..like every 7000km (max 10000km)..so that engine can rev more freely..
Done.

2) install intake that is quite loud and shiok so that u get distracted by it rather than focus on the engine sound..
haha .... placebo effect ... best choice is Gruppe M liao -> $$$

3) turn up the music volume..
nah, not my liking. if going down this path, have to upgrade ICE liao -> $$$

4) have a chio passenger..
:thinking:

 

[wt_know]

Re: High Rev

to alleviate the engine out of breath and struggling syndrome. i'm naive to think that any rev range below redline does not stress the engine out where that's the engine capacity.

i would like to clarify that i did not mean to achive higher performance and there is no way to compete with 323/325 (6-pot). just want to understand the car characteristics and exploit the optimal performance within its limitation

erm... what is it exactly that you are trying to achieve?

faster 0-100kmh sprint?

cos that's what torque is all about - acceleration.

 

[Deadkookaburra]

Re: High Rev

realistically there's only so much you can squeeze out from an NA - N46 unless you introudce force induction. try lighter parts to reduce unsprung weight

 

[wt_know]

Re: High Rev

understand.

some time when i step hard i can hear the engine struggle like mad and it sounds like a 1-ton lorry going up slope :errrrrrr: .... just want to learn how can i make things 'smoother'

i guess the best way is to step soft and let it accelerate bit-by-bit

realistically there's only so much you can squeeze out from an NA - N46 unless you introudce force induction. try lighter parts to reduce unsprung weight

 

[jinooi]

Re: High Rev

in order to do that, there are 2 ways:-

forced-induction - go either turbo or supercharged. (i guess this will not be an option to you.)

better aspiration - better air intake like aftermarket air filter such as K&N, and drop in air scoops. these will effectively let your engine breathe better.

you should not consider open pod air intakes, as you will lose low-end torque.

to alleviate the engine out of breath and struggling syndrome. i'm naive to think that any rev range below redline does not stress the engine out where that's the engine capacity.

i would like to clarify that i did not mean to achive higher performance and there is no way to compete with 323/325 (6-pot). just want to understand the car characteristics and exploit its performance within its limitation

 

[leebmer]

Re: High Rev

thanks for your suggestions

welcome..the chio passenger is to distract u (similar tactic like Gruppe M)..think K&N filter should be good enough ($100 plus)..

what the service guy in pml told me is bmw 4-potter is designed to handle/achieve higher performance..unfortunately, the engine will still sound like it is struggling at high-rev..

maybe install K&N filter, sprint or velocity (depend which one u like), reduce unsprung weight like what Deadkookaburra mention..

possibly for future consideration -> 335i..it will keep going and going until driver turn pale..

 

[davidtch]

Re: High Rev

Guys, for air intake, no matter what u do, it is still restricted by DISA. DISA activator is controlled by ECU.

 

[jinooi]

Re: High Rev

what's DISA?

 

[ac323]

Re: High Rev

Hi wt-know,

like what all the bros had suggested, drop in K&N air-filter, probably you wanna install better plugs and go for a ECU re-mapped to help abit.......

install velocity device (if need to)

definintely you will feel the difference....

improve on the handling as well....go for ST coilover v1 or v2 then install anti-roll bar....

happy modding.........

cheers

 

[wt_know]

Re: High Rev

thanks for everyone suggestions and tips.
have changed the stock paper filter to huricane performance filter at j4c this mrorning
the rev is a lot smoother and less out-of-breath (aka choking) effect
not that the car has increased power or performance but seems smoother -> so far i'm satisfied

 

[ac323]

Re: High Rev

Hi wt-know,

okie...cool.....

try re-mapped ECU..........

cheers

 

[wt_know]

Re: High Rev

haha ... drop by BVO 2 times and Bernard is always busy or not in the shop. i read bmw-malaysia forum that Bernard went to KL to tune a few cars last 2 weeks and most of them give positive feedback :woottt:

i'm a strong believer of intake+exhaust for optimal result. but, for 320 if retrofit an aftermarket exhaust such as sebring is a disaster. i was thinking what about a 323/325 oem exhaust if i can get a used unit (cheap cheap) assuming 323/325 oem exhaust > 320 oem exhaust but without the low end suffering given by aftermarket performance exhaust.

Hi wt-know,

okie...cool.....

try re-mapped ECU..........

cheers

 

[jinooi]

Re: High Rev

the 320 is a 4-pot.

the 323/325 are 6-pot engines. their exhaust config as follows:-
3 cylinders empty into one manifold , which then carries on into 2 separate downpipes all the way into the tips at the end.

how do you intend to use the 323/325 exhaust on your 4-pot?

btw, what gives you an impression that aftermarket exhaust such as sebring (which you specifically mentioned) will make you lose low-end torque?

haha ... drop by BVO 2 times and Bernard is always busy or not in the shop. i read bmw-malaysia forum that Bernard went to KL to tune a few cars last 2 weeks and most of them give positive feedback :woottt:

i'm a strong believer of intake+exhaust for optimal result. but, for 320 if retrofit an aftermarket exhaust such as sebring is a disaster. i was thinking what about a 323/325 oem exhaust if i can get a used unit (cheap cheap) assuming 323/325 oem exhaust > 320 oem exhaust but without the low end suffering given by aftermarket performance exhaust.

 

[wt_know]

Re: High Rev

the 320 is a 4-pot. the 323/325 are 6-pot engines. their exhaust config as follows:-
3 cylinders empty into one manifold , which then carries on into 2 separate downpipes all the way into the tips at the end.
how do you intend to use the 323/325 exhaust on your 4-pot?

sorry, i meant muffler only. i'm looking at remus, sebring or arqray muffler so not sure whether a 323/325 muffler can be fitted on 320 for consideration too.

btw, what gives you an impression that aftermarket exhaust such as sebring (which you specifically mentioned) will make you lose low-end torque?

read posts and feedbacks here from 320 owner who has installed sebring experienced noticeable loss of low end.

 

[Deadkookaburra]

Re: High Rev

former user of a sebring on an e90 n46 myself...very noticeable loss of low end. i read on my sebring label the same model also fits a 320/3/5/30. maybe this explains why the greater loss on a 4pot.

imo no point fitting a 323/5 OEM exhaust since it's basically sound you want and those are way too silent.

maybe wt_know you should try BMW performance exos, supersprint or arqray for 320 instead.

 

[wt_know]

Re: High Rev

arqray muffler for 320 is always my top priority for its quality and sound. the only thing that hold me back is arqray is the most expensive.

btw, if arqray muffler is specifically designed for 320 (unlike sebring), will it be any loss of low end or loss of low end is inevitable for 320 ? that will help me to decide a lot easier

 

[ac323]

Re: High Rev

Hi wt-know,

why not just operate your stock exhaust?

cheers