upgrade performance 325

[wan syahmi]

i want ask all sifu here, iam decide to upgrade my 325 i 1 step further, my head are already port , and now iam decide to uprade valve, (change to bigger ) and skim head. anyone know where to find bigger valve and how much is it. and for the skinning , how deep the max can i skim? sometimes forumer said, temp will erach higher when they do skimming, but i think thats because the car is running lean after lean. anyone can help me?.

 

[Fadhlan]

I'm not an expert on BMW and especially BMW engines. Been an OM for about less than 2 weeks only. But I've been an automotive engineer for 8 years now, and only on engine design and development.

The amount of testing done on our BMW engines is massive, bro. It's just countless of testing and validating and retesting and retesting and validating and retesting again. And I think for BMW, they are probably doing it many many times over than your average OEM.

My advice is don't start poking around your internals. Potong block, korek head, potong spring, ganti valve, ganti piston ringan - these are all destined for disaster. Maybe not today, maybe not tomorrow or next week, but definitely this is just asking for trouble. Don't touch the internals - head, block, piston, crank, connrod. These are all BMW signature. They're good already as it is.

:68::68::68:
If you want better ride and handling - replace sport springs, shocks, roll bar, strut/sway bar.
If you want better acceleration - replace exhaust, intake system, ECU remap, velocity booster, spark delivery system.
If you want a better look - M body kit, exhaust tips, leather seats, rims, tires.

Last but not least, enjoy the ride. Joy is BMW.

:driver:

 

[B33mEr]

Bro Fadhlan there's always room for improvements having said that BMW engine are fully optimised out from factory and little can be gain from bolt ons such as air intake, pulleys and exhaust mods. The best gains however from bolt ons is header aka extractor manifold plus enlarging the exhaust ports. Hence there are people that have pushed the envelope when it comes to pushing the engine maximum performance.

Do follow this thread on e46fanatics.com - http://forum.e46fanatics.com/showthread.php?t=736943 - the search for more NA power

And if you want to go more extreme then follow one of many "pei330ci" threads on building a M54B30 racing engines on the same forum.

Bro Wan Syahmi if you want to go for NA power the cost can be very expensive and time consuming. For M54 engine series the best bang for buck is Force Induction i.e. supercharge easily add 80 - 100hp

I suggest you read first before asking on those forum, there are wealth of informations which you can't find here

 

[perryyip73]

There is an seller ring me up before, cant remember his name (indian). He was saying he did 3rd stage of supercharged for his 325ci and reached almost 500hp. U can refer to those sifus, get their advised before u really start the project.

 

[wan syahmi]

i think i dun need sc my engine. iam just target about 230whp only, safe for my gearbox, and its enough to enjoy the ride. now my whp is 205, just need litle bit to make 230.

and

If you want better ride and handling - replace sport springs ( DONE) , shocks ( DONE), roll bar ( DONE), strut/sway bar ( DONE).
If you want better acceleration - replace exhaust ( DONE), intake system ( DONE), ECU remap ( DONE), velocity booster ( DONE), spark delivery system ( DONE) .
If you want a better look - M body kit ( DONE), exhaust tips (ALREADY CHANGE THE WHOLE EXHAUST), leather seats (ALREADY) , rims ( DONE), tires ( DONE).
MAKING 230WHP....ERMMMM (NOT DONE YET)..

 

[B33mEr]

^^^ 205whp is already very impressive bro :top: All the best luck in getting to 230whp ...

Can you post up your dyno sheet?

 

[wan syahmi]

maybe later, after next tune. i dun print my latest dyno, just have my dynosheet before. anyway ill post it tomorrow. maybe. and do u know how much power lost?. i meant if i got 205whp, how much my engine power?. and how to calculate it? my gearbox is auto. tq.

 

[initialM]

205 rwhp is very impressive. What are the mods? How much the torque?

 

[hakim_radzuan]

205WHP for 325 are damn good enough IMHO...

 

[wan syahmi]

tomorrow, ill try to upload my video. just a short video

 

[B33mEr]

Eh ... bro don't forget to upload/post up your dyno sheet as well :top: