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10-02-2014, 10:42 AM | #1 |
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I've got an N51 motor... manifold/more power options?
I've done a bit of reading and had the famous 3-stage manifold swap in mind for my 128i. Well, after re-checking the WebETK sheet, turns out my car is a March '09 build and has the N51 motor, not the N52.
My research indicates that all N51's came with the 3-stage DISA manifold, and the motor has lower compression which pulls power down a bit. So then, it appears that Active Autowerke has a tune available, and Evolve is working on one as well (thank you, St|g for helping me with that). Is the tune worth doing? I guess I'm curious what sort of power potential the N51 has versus the N52. Seems you N52 folks can get 'em up to about 260-270 crank hp, so I'm wondering if I can come close to that number. The car is plenty quick as it is, but more power is always more better
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10-02-2014, 10:50 AM | #2 |
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Hey bud, the power difference between the SULEV and non-SULEV models is barely different and were both rated at 230. The tuning potential, once better understood, is nearly identical between the N51 and N52.
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10-02-2014, 10:53 AM | #3 |
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Just for reference, N51 motor here with an AA Stage 2 Tune.
I'm at 218 whp @ 200 ft-lbs currently on a 93 octane tune. Once I get headers I'll most likely go to a race gas tune. |
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10-02-2014, 11:05 AM | #4 |
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Wow!! I personally would feel better with more torque since the HP feels fine (the distance getting to 80). But I feel it could get to 80 a bit more quickly, IMO.
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10-02-2014, 11:48 AM | #5 | |
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Lag/shuddering down low is basically eliminated. Response from the throttle is greatly increased and the pull to 3.5k is really noticeable. |
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10-02-2014, 01:40 PM | #6 |
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Really interested in the AA N51 tune myself. FWIW I never noticed that throttle response delay until immediately after I installed my SSK, where I routinely experience it now.
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10-02-2014, 03:29 PM | #7 |
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I'll be curious to see your torque post headers with 93 as a point of comparison between the N51 and N52.
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10-02-2014, 04:10 PM | #8 | |
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I think for now, I am just going to stick with the car in stock form, take it to a couple track events until I can get a feel for the car. I usually start with suspension and brakes first, before any power gets added. It's been my belief till today. But compared to my 95 M3... the 128i does feel a bit lethargic and my M3 is mostly stock, except for the brakes, polies, and bilstein suspension with H&R springs. I never felt a need to touch the engine. |
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10-03-2014, 07:08 AM | #9 | ||
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Besides Headers, Diff and a LTW Battery I've done basically everything I can do to the car. I'm at 2981lbs too, so that helps a bit with acceleration. |
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10-03-2014, 09:47 AM | #10 |
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I badly need to get active to give me the same tune. Might have to purchase a simon tool right now so they can send me the file. What did you ask them to do to get the hp/tq numbers you got?
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10-03-2014, 10:00 AM | #11 | |
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He gave me a base file. I dyno'ed and provided the results and he made some changes on high end valvetronic, ignition timing and wide open fuel. Haven't dyno'ed since then...but the numbers should theoretically be a bit better. The dyno was on the first file, not the revision. In the end the cats are the limiting factor. In a 5th gear pull they just get too hot and you need to dump fuel before you burn them up. Aftermarket cats will solve this as you don't need to worry about exhaust temp |
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10-03-2014, 10:31 AM | #12 |
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How do we know this is happening?
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128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff "The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is |
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10-03-2014, 12:32 PM | #13 |
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Because I run stupid rich. Over 5.5k I end up running around 12:1
You need to keep the OEM cats cool. They are controlled off EGT (Exhaust Gas Temp). If you fail to meet that the engine will dump fuel to save the cats. Until you get rid of the OEM cats you have to dump the fuel to keep the temperature low. |
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10-06-2014, 08:38 PM | #14 | |
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10-06-2014, 09:19 PM | #15 |
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Yeah running rich is fine. like kgolf said it just dumps the fuel to cool the cats down. Running lean is what can be dangerous.
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10-07-2014, 12:43 PM | #17 |
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10-07-2014, 02:18 PM | #18 | |
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No harm in this though, it's designed that way to save the engine. too rich will really just kill power but typically doesn't cause any harm. unless your injectors are just pouring fuel into the cylinders in which case it can hydrolock and bend some rods.
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10-14-2014, 02:51 PM | #20 | |
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Supersprint does as well, and they excellent as they use HKS cats, but the price is anything but cheap.
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2005 E46 M3 Interlagos/Cinnamon with Sunroof Delete
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10-14-2014, 04:01 PM | #21 |
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Again, please forgive my ignorance... where is the link on this forum I can go to and see what vendors support the N52N 128i? I have a 2010 E82 coupe with M-Sport package.
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