FI vs stroker

[Northern]

For example, the N54 appears to be the "top dawg" of turbo BMW platforms - but seriously, the heads flow about the same as an 885 M20. All it really has going for it is a stout bottom end and lots of aftermarket support.

Don't forget GDI, huge difference for how much boost you can slam into it. M52 has the same 10.2:1 CR, but you don't see much more than 400~450whp on stock CR+pump gas.

[nando]

Most N54s aren't more than 450whp anyway (maybe 5% of them). Plus they are basically ticking time bombs - injectors, coils, waterpumps, wastegates, it never seems to end..

[The Dark Side of Will]

Yes, no. The N54 ports are shorter and are cast "as is", while the N52 ports are CNC'd like the S54. I was shocked when I looked up N54 flow charts - even ported, it flows about as well as a ported 885. It also has smaller valves.

That's surprising.

I guess the turbo engine is tuned for MOAR TORK.

[nando]

Or it just didn't matter because they were boosting it so the extra cost of porting it wasn't worth it. The few ported N54 heads I've seen made more power/torque everywhere, so it's not like they were trying to keep up velocity or something. I think the smaller valves are due to the smaller bore & shrouding issues.

[digger]

m20 + small turbo will offer more BFYB than good 2.8L NA which is what is need for 250hp. its not the way id do it but thats not the question asked....

Also lol at all the contradictions earlier in this thread

[Nisse Järnet]

I think what Nisse is saying - an engine with a higher N/A VE, will make more power for the same given boost level than an engine with a lower N/A VE. And I agree with that. :)

For example, the N54 appears to be the "top dawg" of turbo BMW platforms - but seriously, the heads flow about the same as an 885 M20. All it really has going for it is a stout bottom end and lots of aftermarket support - but those guys think that 500whp is the shit (on stock turbos, at 20+ PSI), but people have been doing that on turbo builds (M20, M50, S38, whatever) for ages with way less boost.

Yes! :D

[ACVC325ix]

Nisse, Do you DD your IX or just race? I watched some of your Race vids and your car is very impressive!

[Nisse Järnet]

Nisse, Do you DD your IX or just race? I watched some of your Race vids and your car is very impressive!

Thanks! :) Its not a daily but i use it as a fun street car, i typically drive the car around 10 000km/6000 miles a year or so.

[Alaska Ted]

Thanks! :) Its not a daily but i use it as a fun street car, i typically drive the car around 10 000km/6000 miles a year or so.

More videos please

[Nisse Järnet]

More videos please

:)

[ACVC325ix]

So inspiring! The only make I like to see get beat more than Porsche are Mercs, they are always so cocky!

[Nisse Järnet]

So inspiring! The only make I like to see get beat more than Porsche are Mercs, they are always so cocky!

Mercs you say, no problems :D With the rwd E30 though, so feather the throttle in the first 4 gears :P

[2santiago]

Mercs you say, no problems :D With the rwd E30 though, so feather the throttle in the first 4 gears :P

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[ACVC325ix]

Mercs you say, no problems :D With the rwd E30 though, so feather the throttle in the first 4 gears :P

oh man that's so great! How do you like the M50?

[ACVC325ix]

Don't waste time with a 2.7/2.8... go to 3.0.

Also, you'll need a good bit of head work and a fairly aggressive cam to hit 250 hp.

Fairly aggressive CAM being 288? I don't want lose all my low-end power/driveability...still looking for the best of both worlds i suppose