128i Performance Parts?

[tranism]

Originally Posted by wrldtravler84

I have the Injen intake and love it. Easy install too

What about between the Injen vs BMW Performance intake?

[wrldtravler84]

Originally Posted by tranism

What about between the Injen vs BMW Performance intake?

Well your going to spend about twice as much and basically get the same outcome

[Zeros and ones]

Originally Posted by tranism

What about between the Injen vs BMW Performance intake?

if you do not do your own filter and oil change than getting the performance intake is ideal because BMW will do everything for you plus will be covered under the warranty of the car.

If you do your own filter and oil change than it really does not matter what intake you get.

[Anto2156]

thanks for your input guys

[GuamX1]

Would it make a difference on the 128 if I put in the axle back from a 135 of the same year? Will it even fit?

[TheSt|G]

Not going to make a difference in power, but yes, it sounds different.

[chris82]

Originally Posted by Guam135i

Would it make a difference on the 128 if I put in the axle back from a 135 of the same year? Will it even fit?

It will fit, I put an '11 OE 135i exhaust on my '08 128i, gives a decent bump in sound too. Everything appears to line up perfectly

[Taskmaster]

Judging by 613's numbers, It probably will lose power.

[631twentyeighteye]

Originally Posted by TheAxiom

Judging by 613's numbers, It probably will lose power.

I attribute that loss to the injen more than the resonator delete and 135i muffler. Car feels a bit better with the eurobox in place of the injen.

Resonator was back in place when I went to that dyno day with chrisar. Still had the 135i muffler and Injen intake however.

Will confirm when i have time to get a custom tune done sometime in the summer or fall.

[Taskmaster]

Originally Posted by 631twentyeighteye

I attribute that loss to the injen more than the resonator delete and 135i muffler. Car feels a bit better with the eurobox in place of the injen.

Resonator was back in place when I went to that dyno day with chrisar. Still had the 135i muffler and Injen intake however.

Will confirm when i have time to get a custom tune done sometime in the summer or fall.

I don't think we can attribute it to the resonator delete, as that really won't negatively impact flow.

It's either a. the Intake (which I think attributed to part of it, or b. The exhaust system - the transition between the stock exhaust and the new muffler,or even the muffler itself could impeed flow and cause a loss in power.

Have a picture of the exhaust system? How many miles on the car? No valvetronic issues or vanos solenoid issues?

[631twentyeighteye]

I don't have a current picture from underneath. It's literally just the 135i muffler with a few inches of piping slid right over the end of the 128i piping. The rest of is is now factory 128i mids and then the Mapleridge catless headers.

The Injen heated soaked on the dyno. I don't think it was as big a difference in real world driving with airflow from the kidneys. Not too sure though.

[chris82]

Originally Posted by TheAxiom

Judging by 613's numbers, It probably will lose power.

Originally Posted by TheAxiom

It's either a. the Intake (which I think attributed to part of it, or b. The exhaust system - the transition between the stock exhaust and the new muffler,or even the muffler itself could impeed flow and cause a loss in power.

No way. The pipes on the 135i muffler go straight through, no restrictions at all. The diameter is slightly larger too. I think it was the Injen or like you said, the connection of the 135i exhaust to the rest of the system.

Here is what's inside the 135i exhaust, thanks to whoever took the time to do that: http://home.comcast.net/~david.johns...MWMuffler.html

According to his measurements (David Johnson?):

"The full flow pipe is ~2.4" diameter, for 4.2 square inches.
The valved pipe is ~2.3" diameter, for 3.8 square inches.

4.2 + 3.8 = ~ 8 square inches through the resonator, and out the tips.
5.7 in, 8 out. Not much of a restriction, except maybe the "S" bends."

[GuamX1]

Originally Posted by chris82

It will fit, I put an '11 OE 135i exhaust on my '08 128i, gives a decent bump in sound too. Everything appears to line up perfectly

Thanks I like the black tips too

[Murphy8]

How to make a 128i a lot faster without a turbo or supercharge kit?

[Swimjim]

Murphy... I recently did an AA tune, k&n drip in filter, charcoal filter delete, and afe scoops. Very satisfied with power gains. Add header and will get you some more.

[1smokehouse]

Getting the PE installed next week. Really looking forward to it
Next on list is the AA tune with the G5 Programmer. Too long to wait for my puter if I have to ship it back... Then maybe the BMW PS/PB combo to finish it off...

[Xyloft]

Originally Posted by Murphy8

How to make a 128i a lot faster without a turbo or supercharge kit?

from what I have read: DISA intake manifold, headers and tune.

DISA intake manifold and a Tune will add a good amount on their own, if you dont want to spring for the headers.

I'm sure others with this mod will chime in.

I was budgeting that around $1000 for the DISA intake and the AA tune with the tuner. Decided against it for now though do to non car related issues.