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      10-31-2010, 05:33 AM   #1
Olorin
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Improving throttle speed with E90 320i

Hi guys,

I've got a 320i 2005 E90 model and I want to discuss ways of improving the performance of my car (without selling it ). Got the car a month back as it was the only E90 I could afford.

My previous car was a Toyota Corolla 140i so the difference in power is definitely there, I can feel it. But I want to know what I can do to improve throttle response and mid-range acceleration. You guys are the experts, I'm very much in a learning phase right now so any advice would be appreciated.

I've been told a few things to do :

1) Exhaust
2) Remap
3) Chip
4) Changing diff
5) Decatt

If I had to do any one thing on the list, which would give me the greatest improvement ? I realize that I have a 4-cylinder car but I can't make it go like a 325i but I really need good advice as to improving my acceleration.

When I'm on the high-way I don't have any issues with speed as cars usually just get out of my way, but when it comes to speeds from 60-100km, overtaking speeds in particular are a chore.

I know, diesel might have been a better buy but the sound they make ? Horrible. So what do you guys think ? Can I improve the performance to a decent enough level ? Or am I beyond hope ? Thoughts would be appreciated.
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      10-31-2010, 12:01 PM   #2
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Anyone ?
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      10-31-2010, 12:56 PM   #3
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      10-31-2010, 12:59 PM   #4
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What is that ? Please explain what kind of improvements that will give. Thanks for posting.
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      10-31-2010, 01:03 PM   #5
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Its a piggyback tune that improves throttle response and adds a few horses. Do a search and I'm sure you should be able to find more.
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      10-31-2010, 02:35 PM   #6
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Quote:
Originally Posted by OlivaresAnthony View Post
Its a piggyback tune that improves throttle response and adds a few horses. Do a search and I'm sure you should be able to find more.
The PBX is for the N51, N52 and N53 (I6?) engines, his is a 4.
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      10-31-2010, 02:46 PM   #7
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So then the PBX won't benefit those with 4 cylinder engines ?
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      10-31-2010, 02:53 PM   #8
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Originally Posted by Olorin View Post
So then the PBX won't benefit those with 4 cylinder engines ?
According to BMS, the PBX is designed only for the NA I6 engines. It is however the most bang for the buck mod at this moment for the NA I6.
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      10-31-2010, 03:04 PM   #9
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Damn. Are there any chips like the PBX that is designed for 4 cyl engines like the 320i ? I really need all the help I can get here.
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      10-31-2010, 03:20 PM   #10
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Originally Posted by Olorin View Post
Damn. Are there any chips like the PBX that is designed for 4 cyl engines like the 320i ? I really need all the help I can get here.
Maybe you can start small, add a high flow oiled filter to replace the stock paper filter and see what happens.
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      10-31-2010, 03:33 PM   #11
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But is there nothing out there designed for 4 cyl engines ? Nothing to help out the smaller folks ? I could always do as you suggest but I have no idea what would change. I might not even notice a difference changing the stock paper filter.

Do the vendors chime in every once in a while ? Is my car simply a lost cause altogether or is it possible to ring out an extra bit of performance without breaking the bank entirely ?
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      10-31-2010, 06:31 PM   #12
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Quote:
If I had to do any one thing on the list, which would give me the greatest improvement ? I realize that I have a 4-cylinder car but I can't make it go like a 325i but I really need good advice as to improving my acceleration.
The answer, imho, is changing the diff to a shorter ratio. More expensive, but significant, measurable improvement in acceleration. The engine will spin harder cruising on the freeway, and your mpg will go down. If your car is a 6 speed, the impact is less.
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      11-01-2010, 12:35 AM   #13
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My car is a 6 speed manual.
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      11-01-2010, 10:12 AM   #14
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Dude I. Don't think there is hope for u at this time but, all the stuff you listed at the top pluss the filter will do a improvement on response. And you need to do all those changes at once in order for u to feel it.
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      11-01-2010, 10:16 AM   #15
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That is exactly the answer I didn't want to hear. Are there no chip solutions designed for the 320i cars ? Surely there is something like the PBX for 4 cyl cars ?
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      11-01-2010, 10:51 AM   #16
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Quote:
Surely there is something like the PBX for 4 cyl cars ?
We don't have the 4 cyl cars in the US, so you're not going to find chips for it here. You may want to check with chip tuning companies in Germany and Europe for a tune for your car.
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      11-01-2010, 11:37 AM   #17
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Sorry, I didn't realize they didn't make 4 cyl cars in the US. I suppose that isn't a bad thing because if you are used to a 325i as your 'entry-level' model, well, the 320i is significantly slower. 110 kw, 200nm of torque. So yeah, I'm in need of help to make the car more frugal...
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      11-01-2010, 12:30 PM   #18
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u need to save weight...i dont think your going to be able to get much power out of it.
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      11-01-2010, 12:40 PM   #19
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The 320i is a popular car outside the US, my sister had one in Australia. I've got to think that one of the tuners in Germany or other European countries has a tune for it. You might also try surfing the Australian BMW forums and tuner websites. Good luck. I know that the PBX, along with intakes mods have worked wonders on my car. Look into a shorter ratio for your diff., that will produce quicker acceleration.
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      11-01-2010, 02:04 PM   #20
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My bad, didn't see the part where OP had a 4 cyl
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      11-01-2010, 02:30 PM   #21
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I would definitely recommend that you upgrade the exhaust and get a tune for your 325i to improve the throttle response of your vehicle.

I would recommend that you check out the following:
1) Remus Sport Exhaust
2) BMS PowerBox

I'll shoot you over a PM with more details!

- Alan
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      11-01-2010, 02:58 PM   #22
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Thanks guys for your help !
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