[accel]

Originally Posted by gunnerxq

Don't forget the 2006 325i weighs 3285lbs
It also has more aggressive gearing than the 330i and the 328i. So basically with all the Mods the 325i is the fastest car out of the NA cars.

Agree, weightwise 325i is the lightest one.

Because I own 2010 model year 328i though, I do believe, it is lighter than stated in specs.
Weight numbers did not change between 2009 and 2010, but a lot of things became
not standard in 2010:

Sunroof (estimated 35lbs savings)
Hood insulator (est 2lbs savings)
4 speakers less (est 17 lbs savings)
prewiring, drink cooler trank storage cover, amplifier, ashtray, cargo nets, and whatever
else

brought me to estimated ~60lbs in weight savings min.

[Staszek]

Originally Posted by accel

Numbers from BMW:

2006 330i - 3417lbs, 6.1 sec 0-60
2008 328i - 3340lbs, 6.3 sec 0-60

Bigger 330 brakes might contribute to the difference and who knows what else, I guess basic set of options was different.

But 0.2 seconds and bigger brakes do not make whole lot of difference, especially if you bought a car to just drive it...

I mean, I used to do lots of autocrossing, and for that purpose brake size was not important at all - they never overheat, but weight savings were extremely valuable as one could carry more speed in turns... I sold my autoX car, and
I bought BMW 328i with an idea of occasional autocross in mind, but this never happened so far... it's life - different times, different priorities. So I just enjoy everyday drive and have some very rare spirited drive sparks...

328i is perfect and very fine car for this purpose. I would buy 330i if I could find used one optioned per my taste, but couldn't find one for 3 months... gave up and am happy with my 328i.

Read my prior post 0-60 is about the only time these cars are really close stock, at 100 there is over 1 second different which equates to a several car length difference like over 5.

You are right about autocross these cars would be very close in performance due to such low speeds in xcross. On a full track where braking matters much more at higher speeds the larger brakes and the extra power in the 330 would be very evident.

328i manual
0-100 mph - 16.4 seconds
1/4 Mile - 14.8 @ 95 mph
50-70 mph top gear - 10.2 seconds

330i manual
0-100 mph - 15.3 seconds
1/4 mile - 14.3 @ 98 mph
50-70 mph top gear - 8.6 seconds

[accel]

Originally Posted by Staszek

Read my prior post 0-60 is about the only time these cars are really close stock, at 100 there is over 1 second different which equates to a several car length difference like over 5.

I did, but I guess the dependency for scenarios like that would be true for any other pair of similar cars with different performance levels.

- All cars need exactly 0 seconds to reach 0 mph ( Delta0 == 0 ).
- At 60 mph they'll have some Delta60 difference in time to reach,
- At 100 mpg the delta would be Delta100 > Delta60 and so on.

[avocet]

well, i just picked up a used 530 manifold with acuators... i am going to try and install over the xmas break. i am going to do a dynolicious run before and after.

i havent yet decided on software, but as a first step, this is going to quantify what gains are to be had with just the manifold.

i have done 2 runs with the dynolicious. first with traction control enabled gave me 7.16sec to 60. second with all traction off gave me 6.7. these are the ONLY two timed accel runs i have ever done(with my full winter tires, no less), so i am pretty sure it will improve dramatically with a few runs under the belt, and even more with the summers on. although 17" 225's weigh much less that 19" 255's(rears), i am certain the traction issues hurt.

i was doing it behind the lululemon store while the g/f was in there, so i am sure i can shave some time off that!!! lol. and dont worry, it was in an industrial park setting on a weekend... NO traffic or cross streets.

so i think the dynolicious will give a solid baseline.

as for the 530i manifold, as far as i can tell, it is the SAME as a 330i. unless they make two different manifolds with the same part number, this is correct.

will keep ya all posted.

MERRY CHRISTMAS TO ALL!!!

[MCOChuck]

Originally Posted by avocet

these are the ONLY two timed accel runs i have ever done(with my full winter tires, no less)

i was doing it behind the lululemon store while the g/f was in there, so i am sure i can shave some time off that!!! lol.

so i think the dynolicious will give a solid baseline.

Looking forward to the super scientific results to follow!

[avocet]

super scientific results: it was damp and sh#tty, and traction sucked, but i think i picked up a 10th to 60 with traction control on, and without couldn't seem to break into the 6's. lol.

but it seems to be punchier. so far just the manifold, and pulled the charcoal filter. cdn 328i with charcoal filter... go figure?

hopefully will find someone local to do an AA tune or something similar.

oh, and i guess old fashioned port injection doesn't have carbon build up!!!

just turned 80,000km:

[avocet]

Update:

This thing has got quite a bit more zip in the upper 2/3s of the tach. Had the TC off and was doin mad "TopGear" style powerslides(in the wet)!!!

Lolol

Anyways, it has been torrential rain. Can't wait for a decent dry day!!! Pretty sure a 0-100mph will show some meaningful gains. Too bad I didn't rip a 0-100 off behind lululemon!!! *jk*

Install was fairly easy, technically, but was pretty much a pain in the ass. The manifold came with both actuators, no oil seperator, and had to swap a few brackets. Other than that, a true bolt on.

Now, what about tunes...

[OPTIMAXED1]

Avocet, did you take any pictures of the DIY ?

Would you have time to post a thread showing how you did this in more detail ? thanks

[avocet]

sorry , didn't take many pics... i was using a DIY, so i figured it's already done:
http://www.zpost.com/forums/showthread.php?t=455180

but there are a few differences in details.

step2: you do not need to remove the cross brace. the plastic valve cover is a royal PITA. you need to unclip the wiring going across and over the valve cover at the aft end, and pull them forward to reach the 2 allen screws on the aft end of the cover, which are under the 'brow'. 1/4 turns with the tips of the fingers. it is tight and i scratched the sh#t out of my arms.

step 6: i undid the oil seperator lines once the manifold was free and pulled up a bit. i was able to reach in past the vacuum pump and grab the hoses and undo them. be patient. the e90 also has a different set up with the oil seperator and lines, but where the lines actually attach are similar. i have seen some manifolds with only one vent line going into the manifold, however, both my oem and 530i manifold had two, with no issues of fitment. i also removed the throttle body at this point.

final step: didn't have the brake line running though the manifold, however, i think i undid it right at the front to ease access. iirc, it runs up and over the alternator.

the manifold came out in an up and back motion. there is also a metal bracket on the bottom the the manifold that has two torx screws holding it on... it holds the wiring harness where the disa control leads come from. it is a pain to reach.

use patience, and never force the plastic connectors. undestand them first, then undo them. breaking them sucks.

and WATCH YOUR TORQUES!!! most of the fasteners are aluminum, so stripping and damaging hardware will be very easy.

[Cesare]

Originally Posted by accel

Agree, weightwise 325i is the lightest one.

Because I own 2010 model year 328i though, I do believe, it is lighter than stated in specs.
Weight numbers did not change between 2009 and 2010, but a lot of things became
not standard in 2010:

Sunroof (estimated 35lbs savings)
Hood insulator (est 2lbs savings)
4 speakers less (est 17 lbs savings)
prewiring, drink cooler trank storage cover, amplifier, ashtray, cargo nets, and whatever
else

brought me to estimated ~60lbs in weight savings min.

What i wouldn't give to NOT have a sunroof in my E90 !

It's really unfortunate that most E90's have sunroofs. I'm tall and it just takes away from headroom. If i knew that 2010 E90's could be had without a sunroof i would have searched a bit longer.... but i bought my '08 with 27k and 6spd MT ZSP's are hard enough to come by in the pre-owned world. Also, mine is a 10/07 build which has the bigger brakes AND is a ULEV n52 without the added SULEV smog equipment that adds weight and complexity.

Safe to say i'm very happy with my E90....but no sunroof would have made it sooo close to being perfect.

[BOBKUR]

change the badging on the trunk.