[gT-BMW]

Originally Posted by Biginboca

300rwp N/A on Pump Gas!

I was just thinking that. 8500rpm in the comfort of an e90 n52 giving e46 m3 owners the buisness

then adding a supercharger on top of that

[W37V]

Originally Posted by gT-BMW

I was just thinking that. 8500rpm in the comfort of an e90 n52 giving e46 m3 owners the buisness

then adding a supercharger on top of that

Not getting to 8500 without opening up the engine. At 8300, BPC reported experiencing valve float. You will def get it at 8500 then.

[CobraMarty]

Originally Posted by hassmaschine

is that 24/36 at 5 bars or 3 bars? typically, they are rated at 3 bars.

Good question.
If they were rated at 3 bar and ran in car at 5 bar, that would increase the flow rate by 1.290.
24 lb/hr become 31 lb/hr and 36 lb/hr become 46.4 lb/hr. That would be way to much fuel for the horsepower level.

Calculated maximum power based on injector size for a well tuned N/A engine like the N52 (assume 0.40 BSFC) with 24 lb/hr injectors is-
For Example-
24 x 6 = 144 lbs fuel/hr / 0.40BSFC =360 HP x 80% duty cycle = 288 HP.
36 x 6 = 216 lbs fuel/hr / 0.40BSFC =540 HP x 80% duty cycle = 432 HP.

If Forced Induction- (assume 0.50 BSFC)
24 x 6 = 144 lbs fuel/hr / 0.50BSFC = 288 HP x 80% duty cycle = 230 HP.
36 x 6 = 216 lbs fuel/hr / 0.50BSFC = 432 HP x 80% duty cycle = 338 HP.

[mrnuke]

Originally Posted by Bob@BPC

36lbs/hr

Is there any strain on the fuel pump or does the stock handle the upped fuel amount with s65 injectors like a champ?

[Noir]

+1 on that question^
curious for the future

[Phyrexia]

If the stock fuel pump bad handle the ESS kit, it shouldn't have any problems handling the same injectors for E85/NA applications

[CobraMarty]

Both BPC and DigiDon were at or close to the limit of the stock FP at 500+HP turbocharged.

36lb/hr and N/A shouldn't be a problem on E85 and max 300 HP if N/A.

[mrnuke]

Originally Posted by Bob@BPC

S54 Int 260 Exh 260
N52 Int 255 Exh 263

S54
Camshaft spread, intake (crankshaft degrees) 130-70
Camshaft spread, exhaust (crankshaft degrees) 128-83

N52
Camshaft spread, intake (crankshaft degrees) 120-50
Camshaft spread, exhaust (crankshaft degrees) 115-60

Having that larger exhaust valve and extra lift really helps.


EDIT: forgot to add the n54 exhaust cam is very close to a s54 exhaust cam, only if it had the lift to match.
Camshaft opening angle, exhaust (crankshaft degrees) 261
Camshaft spread, exhaust (crankshaft degrees) 130-85
Max Lift 9.7mm

How far off are the cams from the S54 from being used in the N52? Also, with double VANOS, is it mainly the cam that has the changes or does the eccentric shaft more aggressive to multiply the lift?

Another question I've had is would the N52 be able to take roller lifters for a more aggressive cam profile?

Lastly, do the stock valve springs have the durability to have the N52 rev out like the S54 or would you need aftermarket parts to help with valve float?

[hassmaschine]

Originally Posted by mrnuke

How far off are the cams from the S54 from being used in the N52? Also, with double VANOS, is it mainly the cam that has the changes or does the eccentric shaft more aggressive to multiply the lift?

Another question I've had is would the N52 be able to take roller lifters for a more aggressive cam profile?

Lastly, do the stock valve springs have the durability to have the N52 rev out like the S54 or would you need aftermarket parts to help with valve float?

non Valvetronic cams are completely different, S54 or not. There is nothing from the S54 cams you could use.

Vanos and Valvetronic are separate concepts. Vanos alters cam timing, Valvetronic alters valve lift.

The N52 already has roller lifters. There are 4 roller bearings on the intermediate rockers alone, lol.

BPC saw float at 8300rpm. You could probably upgrade them but I doubt you would make power there anyway. The N52 valvetrain is so light, you should be able to rev to 8k on the stock springs - remember the S55 revs to 7500 stock and it uses the same valvetrain.

[mrnuke]

Originally Posted by hassmaschine

non Valvetronic cams are completely different, S54 or not. There is nothing from the S54 cams you could use.

Vanos and Valvetronic are separate concepts. Vanos alters cam timing, Valvetronic alters valve lift.

The N52 already has roller lifters. There are 4 roller bearings on the intermediate rockers alone, lol.

BPC saw float at 8300rpm. You could probably upgrade them but I doubt you would make power there anyway. The N52 valvetrain is so light, you should be able to rev to 8k on the stock springs - remember the S55 revs to 7500 stock and it uses the same valvetrain.

Forgive my ignorance. I come from the v8 race engine world, so valvetronic blows my mind and for some reason I thought the N52 didn't have roller lifters.

[CobraMarty]

The N52 is one of the most advanced engines.
-VVT on both intake and exhaust.
-Variable intake valve lift, which controls throttling. No throttle plate is needed. It does have one for backup more as a 'runaway' block/shut off.
-variable intake manifold tract length, 3!M, on some models
All it is missing is DI but the N53 engine had DI only in europe, and the N52 really is not 'bad' not having DI.