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N52 engine build :)
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01-21-2016, 02:58 PM | #67 | |||||||
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I have questions like what is the effect of additional lift? how are the ports optimized for velocity vs flow? Is shrouding an issue? these would affect any decisions made for getting the stock cams reground & any port work that could be done. Quote:
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Sorry if I seem dismissive, but I know exactly what I need to make this work - if you want to build a locked valvetronic build running nitrous and carbs or a $10k standalone then go do it - I'll gladly support you! otherwise, it's pie in the sky dreaming. |
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01-21-2016, 03:00 PM | #68 | |||||
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Sorry, should've realized that.
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Yeah, agreed. OTOH, at least it should be focused purely on performance rather than trying to do things it doesn't have code for. It'll be fun, that's for sure.
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-21-2016, 03:06 PM | #69 |
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The drag from the A/C when the pump is turned off is going to be extremely small. I doubt you could even measure it within the standard variance of a dyno. When it's turned on, yeah, of course it drags power, but just having it there only really costs you a bit of weight.
turning stuff off isn't really hard at all. The CPU is way faster than it needs to be to run the engine, so for example turning off rear O2 monitors doesn't have much of an affect (zero really) on performance. If it did, you couldn't measure it. as far as NOS, the ring lands and crown on the N52 pistons are really, really thin. The pistons are designed to be light for a high revving, N/A application. I'd estimate they are at least half as thick as the N54 pistons. You beat on it with boost or NOS for a long time, you're going to break a piston eventually. |
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01-21-2016, 03:14 PM | #70 | |
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-21-2016, 03:35 PM | #71 |
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yeah it would be easy to measure. but who's running A/C on the track anyway?
also, I'm pretty sure the compressor disengages automatically at high RPM/load. |
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01-21-2016, 03:38 PM | #72 |
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Oh yeah! That's right, forgot about the disconnect and it's easily seen in the summer under wot. Might run it on the track during the summer, anything's gotta be better than the ridiculous temps seen here. A coolsuit and air for the helmet would be handy once I have to wear a firesuit per the rules at MSR but that's down the road...
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-21-2016, 03:48 PM | #74 |
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Understood, easily 110+ on the track on a summer day.
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-21-2016, 03:50 PM | #76 |
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Oh yeah, limp mode city.
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-21-2016, 04:56 PM | #77 |
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N52 ports and valves are better to be sure, but that doesn't mean they can't be improved upon (and they definitely aren't polished - they are CNC milled). the ridge between ports has some pretty harsh edges on it for example. The S54 port is machined in a similar way but it is much smoother overall.
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01-21-2016, 07:22 PM | #78 |
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Sorry, ya lost me. The N52 is ok but could use some work. Would want it to see a competent shop optimize it on a flowbench.
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-21-2016, 09:53 PM | #79 |
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Yup that's right, the AC clutch disengages under heavy acceleration / WOT. AC does NOT rob power when you need power. But like you said, who's running AC on the track? Why not just turn the AC off and let the belt spin? The belt drag is so insignificant on the free-wheeling clutch, it feels like a joke to bring it up (unless your AC clutch is stuck / poor compressor pulley bearing / etc).
Last edited by Dafttt; 01-21-2016 at 09:58 PM.. |
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01-21-2016, 09:56 PM | #80 | |
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01-21-2016, 11:35 PM | #81 | |
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Completely agree with what you said. The difference between AC and no AC is about 15 pounds. If you're going to split the car between the street and track, you might as well keep the AC and go on a diet. However, if you live cold weather and never use it, I see no reason to keep it as well. |
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01-22-2016, 08:04 PM | #82 |
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i just had my intake manifold off 2 days ago because my starter failed WHILE IT WAS STILL ON THE RAMPS when i replaced the waterpump and tstat but anyway i was looking in the head and they are pretty damn smooth as those pics show. Back when people were porting and polished heads on big blocks they looked like that n54 lol. Thats why i said the n52 heads look pretty optimized already, the cost/performance increase might not be worth it, maybe it is, idk what you want to spend
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01-22-2016, 08:11 PM | #83 | |
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01-22-2016, 10:07 PM | #84 |
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Got the engine pretty clean.. Its not perfect but i can touch it now lol.
It was covered in an unbelievable amount of crud but i guess in a way it protected the metal from corrosion! Now that its scrubbed, I'll give it a compression test then pull the valve cover off. |
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01-22-2016, 10:17 PM | #85 | |
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01-22-2016, 11:09 PM | #87 |
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Hopefully it's clean inside without as much crud, return galleys and all...
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2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-22-2016, 11:24 PM | #88 |
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It looks pretty good from what I can tell. There is a little bit of carbon on the underside of the valve cover and around the oil cap, but actually on the inside of the head it all looks like a nice golden color.
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