[gT-BMW]

sup yall my fastest 1/4 mile time with 3stage im, 330i BL tune,3.73 diff, aa headers, secondary cat delete, ran a 14.3@97mph. since both my disa failed ive switched to the stock IM and has been hesitant into replacing the disa valves because i still have passing power and still runs like of it was stock.

im thinking about switching to n54 intake manifold and getting a bcp tune for it. for those that has this setup is this a 13 sec setup for a n52?

[Biginboca]

Originally Posted by gT-BMW

sup yall my fastest 1/4 mile time with 3stage im, 330i BL tune,3.73 diff, aa headers, secondary cat delete, ran a 14.3@97mph. since both my disa failed ive switched to the stock IM and has been hesitant into replacing the disa valves because i still have passing power and still runs like of it was stock.

im thinking about switching to n54 intake manifold and getting a bcp tune for it. for those that has this setup is this a 13 sec setup for a n52?

Yes... it can be. I never broke into the 13’s until I had the N54 manifold. My best with the 3 stage and 3.73 was a 14.018@97.8mph with almost the exact same mods you have now but I had Bob’s tune with that run and not the stock 330 tune.



A lot of this also depends on your driving of course also.

[bluewater328]

So the DISAs failed before or after the 14.3 run? I was kinda thinking you could hit 13s with that setup.

[Biginboca]

Oh and I had MILV’s when I made that run. Do you have MILV’s?

As far as I know I’m the only person on here who has posted that they broke into the 13’s and I never was able to before the N54. I think with MILV’s, Bobs tune, and the N54 you should be able to do it.

[desertman123]

Fastest I've ran was 14.3 at 97 I think. At Bradenton Motorsports Park.

MILVS, AA headers, 3IM, custom Bimmerlabs tune with a MAF delete (in place is a Euro IAT), 3.73 diff

Warm day, bad launches and I think my large DISA wasn't working well at the time. I'd love to try again!

Also inb4 someone says THESE CARS AREN'T QUARTER MILE CARS! You're right, we're having fun. A day of runs down the strip cost like $25. A day at Sebring is like $500.

[hassmaschine]

1/4 mile racing isn't for everyone. But it's worth doing for fun. It's certainly not as easy as it seems, lol.

The N54 manifold bolts up, but the ports don't line up very well. You'd need an adapter or to slot the mounting holes to make it work best.

[Torgus]

Has anyone made a proper intake manifold for the n52 yet? Forward facing log tapered at the end with v stacks off the floor? Or better yet ITB trumpets to a box or with filters.

The stock n54 manifold is far from ideal. It works on the n54 because of boost. The front and rear cylinders have the worst airflow iirc.

Nice to see n52s going to the strip. I would hope they have a high 13 1/4 run with minimal modifications, no cams, head work, real NA mods etc. Just simple bolt ons and a tune.

[Biginboca]

Originally Posted by Torgus

Has anyone made a proper intake manifold for the n52 yet? Forward facing log tapered at the end with v stacks off the floor? Or better yet ITB trumpets to a box or with filters.

The stock n54 manifold is far from ideal. It works on the n54 because of boost. The front and rear cylinders have the worst airflow iirc.

Nice to see n52s going to the strip. I would hope they have a high 13 1/4 run with minimal modifications, no cams, head work, real NA mods etc. Just simple bolt ons and a tune.

No one has made a proper short runner manifold yet. With N54 manifolds being so cheap and available (regularly <$75 delivered on eBay) it’s hard to justify spending so much more on a custom set up for what’s probably <5hp gain.

BPC got 265whp with basically a manifold delete as pictured below.

The n54 manifold set up with complete air filter, manifold, throttle body, and a air density tune (maf delete) tested around 258whp on similar set up (same exact dyno and same model car, 128i manual.)



So it seems like going beyond the N54 manifold isn’t the best place to focus for meaningfully more power on the N52. The exhaust cam or exhaust lifter swap Cobra Marty has alluded to likely would be more promising.

[Torgus]

So take an n54 manifold, band saw half of it off, and put a filter on it? Seems simple enough for someone to make some money off selling it.

NA mods as so expensive per HP. Really got to be committed to an NA engine to make good NA power above 100 hp per liter.

[Noir]

Biginboca

With dragy in your toolset, notice any significant differences in run times between whatever wheel set you had before to the squared ARC-8s? (I'm trying to reconstruct this sentence, because it sounds dumb, but potty time is coming to an end and I'm sure you grasp the intentions of that question)

[Biginboca]

Originally Posted by Noir

Biginboca

With dragy in your toolset, notice any significant differences in run times between whatever wheel set you had before to the squared ARC-8s? (I'm trying to reconstruct this sentence, because it sounds dumb, but potty time is coming to an end and I'm sure you grasp the intentions of that question)

I never tested with just the wheel swap. Going by estimates every 1lb of wheel weight saved would roughly equal 6lbs of static weight off the car. Generally 100lbs off the car is good for around 1/10th second improvement in 1/4 mile times for a car weighing around 3k lbs. So you can kind of guesstimate it lol

[Biginboca]

I did some digging and definitely don’t have records for the wheel swap. I did find this data which I never posted.

The January 2019 runs were with the AFE stage 2 intake, 79mm WCR Big Bore Throttle Body and a 4” elbow connecting the 2. Plus the misaligned N54 manifold.

The March 2019 runs were with a stock US Airbox with ram intake mod, 77mm N54 Throttle Body, and 3.5” piping connecting the 2. (I reduced the piping diameter based on a bunch of research I did that made me think 3.5” will work better for our cars because it keeps the velocity up with less diameter transitions through the tract), and the N54 manifold shimmed to align to the head properly.

Three of these runs had a 2.18 60 foot and one was 2.25 60 foot, so they are good to compare:



As you can see the aligning of the manifold plus slightly reworking the intake tract using stock parts with a ram mod produced a 1mph gain with the same ET. That 1mph gain could be as much as 10hp! (This is why I do not recommend fancy air boxes just mod your stock junk. There’s a bunch of threads which confirm this data too.)

When the weather turns cool in the fall I can’t wait to get some new runs. Since those the car has had another Airbox swap to the euro Airbox whose cone filter that has about 30% more area than the US panel filter I was using. (And I added gold heat tape for Torgus lol)

Plus the car is about 150lbs lighter now than it was when I did all those runs, and by the time fall comes I expect to have another ~60lbs off the car too.

[Noir]

Biginboca
That's what I'm hecc'n bout.
I know you're a Floridian and all that ~ the sunroof important to you? Panel that bad boy? EZ weight loss. ( I need some of that IRL weight loss.. this driver mod? Whew, dawgy...)

[Biginboca]

Originally Posted by Noir

Biginboca
That's what I'm hecc'n bout.
I know you're a Floridian and all that ~ the sunroof important to you? Panel that bad boy? EZ weight loss. ( I need some of that IRL weight loss.. this driver mod? Whew, dawgy...)

One step ahead of you homie! Carbon roof swap from a wrecked M3 about 2 months ago...

[Noir]

Originally Posted by Biginboca

One step ahead of you homie! Carbon roof swap from a wrecked M3 about 2 months ago...

Dawg...

I AM HAPPY AS F TO SEE THIS.
This was my dream for the sedan 😭
I was trying to get my hands on a m3's roof — but I was so uncertain if it was gonna work.
How else you shedding weight?!

That looks so sick, Al!!!

[Biginboca]

Originally Posted by Noir

Dawg...

I AM HAPPY AS F TO SEE THIS.
This was my dream for the sedan ��
I was trying to get my hands on a m3's roof — but I was so uncertain if it was gonna work.
How else you shedding weight?!

That looks so sick, Al!!!

Thanks Tim! I have it all in my build thread but since it’s kind of relevant for the quarter mile thread I guess I can post it here:

M3 Composite Front Bumper Carrier (-8.4lbs)
M3 Composite Rear Bumper Carrier (-11.7lbs)
Seibon Carbon Hood (-25lbs)
OEM Carbon Roof (-44lbs)
Seibon Carbon Trunk (-12lbs)
Antigravity Battery (-37lbs)
Arc 8 18x9 ET30 Wheels with Falken FK510 255/35r18 (-25lbs vs old set up VMR V710 w/Hancook Ventus)

Total = -163.1lbs off the car. Plus some other weight loss from headers and exhaust mods too.

[rjahl]

Originally Posted by Biginboca

Thanks Tim! I have it all in my build thread but since it's kind of relevant for the quarter mile thread I guess I can post it here:

M3 Composite Front Bumper Carrier (-8.4lbs)
M3 Composite Rear Bumper Carrier (-11.7lbs)
Seibon Carbon Hood (-25lbs)
OEM Carbon Roof (-44lbs)
Seibon Carbon Trunk (-12lbs)
Antigravity Battery (-37lbs)
Arc 8 18x9 ET30 Wheels with Falken FK510 255/35r18 (-25lbs vs old set up VMR V710 w/Hancook Ventus)

Total = -163.1lbs off the car. Plus some other weight loss from headers and exhaust mods too.

So here is the big question for all of us.

How many pounds can the driver loose?

[rjahl]

On a serous note;

These cars/n52 are really great. I could not imagine talking about this type of performance for a 3 liter motor In a family sedan back in the 90's. Hell if you look at the so called muscle cats from the 60-70s there"re actually Phenomenal.
Don't fixate on HP numbers but look at actual 0-60 or quarter mile times. There pretty sweet

[Biginboca]

Originally Posted by rjahl

So here is the big question for all of us.

How many pounds can the driver loose?

This driver about 20lbs! But that’s harder than swapping parts, definitely cheaper tho lol

[breakingpoint]

how many HP loss you reckon with a failing DISA?
I dyno'd mine with a broken DISA and I modded it afterwards, while fixing the DISA as well. When I returned to the Dyno, I had no clue what the mods HP gain were, and what the DISA fix HP gain was.

[bluewater328]

I'd wager its about 20WHP you're missing. I dyno'd mine with a broken DISA and I was coming up about 30HP or so less than people with similar setups that posted here. So put some room for variation/minute differences/temp and I'm guessing you could lose as much as that.


This is all pretty depressing though...this means my old Sentra is faster than most of us in terms of 1/4 mile.

[breakingpoint]

Sounds steep, but could be right. It went from 238 crank HP to 275 HP after repairing big DISA, installing catless headers, Mishimoto rubber boot and MILVs. It was tuned on a Bapro dyno, so very accurate at calculating parasitic losses. Was a bit disappointed that after all the hard work, the figures were only 3 HP up from the manufacturer's claimed 272 HP stock.