s52 swap obd1 Dyno

[5mall5nail5]

BKR6E NGK part number 6962 @ Advanced Auto, etc.

Gap @ 0.028"

[hoveringuy]

I'm pretty sure it's the tune, possibly the MAF. It's running pig-rich right before 6200 so your injectors aren't getting maxed.

My motor looked like that before I fixed the tune and I picked-up close to 20hp when I did.

[Fernflex]

BKR6E NGK part number 6962 @ Advanced Auto, etc.

Gap @ 0.028"

I found them at $2.99 each, thats cheap!

My old 2007 335 spark plugs cost $20.00 each

[etxxz]

gonna say its nice to make 250whp, but your enrichment curve is messed up. Maybe a tad too rich around 5500, but at 6200 it starts to become just dangerous. If anything you want to be even richer there.

extrapolate/trendfit(eyeballed) your power curve after 6200. you could get another 20hp+ by 7000 with the right fuel curve. Make sure whoever tunes doesnt just do your WOT either. Thanks for sharing though!!

[e30vince]

very very nice hp

[Fernflex]

BKR6E NGK part number 6962 @ Advanced Auto, etc.

Gap @ 0.028"

Is that the gap that spark comes with?

[Fernflex]

Update 12/24/12

I replaced the spark plugs

Installed:
K&NCone Filter
Aluminum Radiator

And I found the vacumm line from AFPR to the manifold was loose!

[hoveringuy]

Update 12/24/12


And I found the vacumm line from AFPR to the manifold was loose!

I don't think it was your FPR. Your manifold was close to atmospheric pressure the entire time, the transitions in A/F are much to sudden, plus they go up AND down.

I'm betting it's your tune.

[ak-]

Did you ever fix your tune?

[Fernflex]

Not yet!

[Fernflex]

This was done on 91 oct gasoline,87 degrees temp, 40% humidity, No air filter or intake and Flowmeter open to the air.

All runs 4th gear.

Motor: (3.2L S52)

-Bimmerworld 3.5" intake boot
-Dinan Big Bore TB
-Bmp Adjustable Regulator
-Rogue Underdrive Pulley
-FlowMeter Euro 3.5"
-M50 Intake Manifold
-Shrick Cams
-Injectors 24# Bosch
-Oscar Velez Tune
-VAC Motorsports Stage 2 Cylinder Head
-MLS Gasket .80
-Head Studs ARP2000
-Dr.Vanos kit stage1
-Header Supersprint Euro Rep.
-Track Pipe Active Autowerke
-Catback B&B Triflow
--------------------------------
Drivetrain:

-Clutch UUC M5
-Flywheel UUC 11.5lbs
-Diff 3.46

After many months I haven't done too much to the car and discussing with my mechanic when could I take the car to fix some stuff. I told him my speedometer still not working a friend of mine hears me and tells that probably my engine is in limp mode and thats why the graphic is so bad in high rpms.

Could this be a reason?

The day of this dyno graphic I also had no intake filter and the vacuum line for the afpr was loose.

[hoveringuy]

Something screwy at 6200 for sure; you're AFR jumps from 11.5 (a little too rich) all the way up to 16. I don't see the FPR doing that so quickly. Tune?

[DesertBMW]

Its the worthless euro 3.5" maf. Put the stock instake back on there.

[squidmaster]

^^ agreed
or the tune

[Fernflex]

I dont have the stock maf, why do you say it could be the MAF?