[tlow98]

Random question...any way to limit and control boost per gear and rpm using the stock ECUs? Would be nice to try and maintain linear (NA) power development.

I'm still baffled that the F80 M series didn't go this route.

Also, interesting you're going to maintain your awd. The plot thickens...

[hassmaschine]

Are you sure they don't use boost per gear? I'm pretty sure all modern turbo BMWs do, even the first 335i?

anyway, it might be possible, but it would take a lot of reverse engineering.

[JuniorB]

Originally Posted by Hobbs64

Junior,

I'm curious why you think the N52 with a single will be costly (comparatively)? As long as you build the N54 bottom end like any other N54. It is neither more, or less than any other N54. The only piece I'm still putting together in this puzzle is the piston dome. Lots of shops have opinions about what to use. I think at the end of the day, I am going to use an upgraded forged 10.2 piston. It has a dish, not a dome. The configuration is conventional, and so long as the relief cuts in the piston will accommodate the larger valves, it all works. Do you know of anyone that has cc'd the combustion chamber of either the N52, 54 or 55? I am assuming the volume and configuration are very similar.

If the runners of the N55 exhaust manifold were not undersized, I would use that set-uip as well. What do you think I'm missing here?

Sorry,the n52 has no provisions for a turbo.now your tapping and making lines to cool the turbo,unless it was q comp. This 52 turbo kit may be another ess nightmare. Is love more power,the 54 may be cheaper in the long run.

[JuniorB]

Honestly, I saw all the issues the 54 had,pumps,injectors,wastegates,. I wanted to stay na,that's when the 3si was getting big,aa a was in the header production. I spoke with Lang Racing about putting an s54 in my e60. It ca be done butmi didny want to run a manual or problems with the smg. Is lose like the Ac and cruise control,but the aftermarket options were there and proven. Then Hpf came out with there outrageously overprice turbo kit that pushed a healthy 1k+ ,that the na motor to have i guess.

[hassmaschine]

you could swap an S54 into an E60 series and keep A/C, cruise control, etc. - you just need to use MSS70 instead of MSS54.

[Terraphantm]

Originally Posted by hassmaschine

you could swap an S54 into an E60 series and keep A/C, cruise control, etc. - you just need to use MSS70 instead of MSS54.

He doesn't know how to drive stick though so that's not really an option

[hassmaschine]

true - sucks to be him.

although, I believe MSS70 does support the DTC (as does MSV70, MVS80), although no Z4M ever came with it so I have no idea how you would configure it properly.

[Terraphantm]

Originally Posted by hassmaschine

true - sucks to be him.

although, I believe MSS70 does support the DTC (as does MSV70, MVS80), although no Z4M ever came with it so I have no idea how you would configure it properly.

Yeah when I briefly looked it seemed like most of the automatic/smg/ssg etc maps were blanked out. And even if you could populate that stuff, you'd have to tune the transmission software for proper shift points, red line, etc.

Though really, if I wanted a fast E60, I'd just get an M5. They're pretty cheap nowadays. Unreliable, but probably still more reliable than hacked head/block combos with poorly tuned FI.

[hassmaschine]

yeah I don't think the S54 would be great in an E60.. too heavy. It's good in an E46 and wonderful in an E30 or E36.

But, that's way off topic.

[JuniorB]

Haha, I drive one everyday! Besides an auto is quicker than a manual will ever be,no matter how fast your feet are. It is heavier, may be inbetween an i6And v8vi heard that thing scream with the throttle body's open....but that the answer I got at the time,and it was the only one. They are big money to build,but the aftermarket support is there. Still light than a v10.

[JuniorB]

I've heard the same thing but the bearing issue and keeping tabs on that,a smg pump if you have that,the maintenance is expensive as hell! They sound so sweet @8k

[Terraphantm]

Originally Posted by JuniorB

Haha, I drive one everyday! Besides an auto is quicker than a manual will ever be,no matter how fast your feet are. It is heavier, may be inbetween an i6And v8vi heard that thing scream with the throttle body's open....but that the answer I got at the time,and it was the only one. They are big money to build,but the aftermarket support is there. Still light than a v10.

Autos have only recently gotten faster, and even then that's mostly because they can hold boost between shifts. In the E6x/9x days the ZF 6-speeds were on par with manuals. The GM 6-speeds were awful.

M5 is V10. And you can dump $30k into an S54 and still fall short of stock S85 power.

[tlow98]

Originally Posted by hassmaschine

Are you sure they don't use boost per gear? I'm pretty sure all modern turbo BMWs do, even the first 335i?

anyway, it might be possible, but it would take a lot of reverse engineering.

No, def not sure about boost per gear. I just lumped that in there bc I know so little about turbo bmw's.

[hassmaschine]

Originally Posted by JuniorB

Haha, I drive one everyday! Besides an auto is quicker than a manual will ever be,no matter how fast your feet are. It is heavier, may be inbetween an i6And v8vi heard that thing scream with the throttle body's open....but that the answer I got at the time,and it was the only one. They are big money to build,but the aftermarket support is there. Still light than a v10.

Yeah, no. And even if it were, its still boring and sucky to drive, more failure prone, and not possible to rev past 7k.

[justpete]

Originally Posted by Terraphantm

Autos have only recently gotten faster, and even then that's mostly because they can hold boost between shifts. In the E6x/9x days the ZF 6-speeds were on par with manuals. The GM 6-speeds were awful.

M5 is V10. And you can dump $30k into an S54 and still fall short of stock S85 power.

Out of curiosity what are typical shift times for automatics these days? Not the DCT/DSG types, just the regular everyday slushboxes BMW's putting in their cars over the last few years.

[JuniorB]

Was the smg the trans to have behind the m cars? Until the pumps went,then nobody wanted them.

[Terraphantm]

Originally Posted by justpete

Out of curiosity what are typical shift times for automatics these days? Not the DCT/DSG types, just the regular everyday slushboxes BMW's putting in their cars over the last few years.

They're pretty damn fast. From what I remember they're not significantly slower than the DCTs. Sequential up and downshifts in around 100ms, and can skip gears too in 200ms.

[hassmaschine]

That would be the new 8 speeds etc. The transmissions in our cars are slushboxes. Shift times matter less when you put less power to the ground in the first place.

Anyway, it really only matters when your 0-60 time is like, 4 seconds or less. When you have a 7.5-8 second time like an E60 525i automatic, being an automatic doesn't mean it's faster, it's just slow as balls.

[justpete]

Originally Posted by Terraphantm

They're pretty damn fast. From what I remember they're not significantly slower than the DCTs. Sequential up and downshifts in around 100ms, and can skip gears too in 200ms.

Good to know, tnx. My 6MT/driveline setup yields shift times around 200-250ms so it's all good.

[Terraphantm]

Originally Posted by hassmaschine

That would be the new 8 speeds etc. The transmissions in our cars are slushboxes. Shift times matter less when you put less power to the ground in the first place.

Anyway, it really only matters when your 0-60 time is like, 4 seconds or less. When you have a 7.5-8 second time like an E60 525i automatic, being an automatic doesn't mean it's faster, it's just slow as balls.

Yeah it's pointless when your car makes no power.

Though like I mentioned before, a big advantage they have is for FI cars since they can hold boost between shifts unlike manuals.

[JuniorB]

That's why for the motor swap,the wrenching is the easy part. The engine harness goes with the motor,now the hard part. So I know this donor car was an accident car,deployed bags,does this make the dme and case unable to use? Its a low mileage stock car,I can up grade turbo's and inlets Hass you know this software, will this still show up as an 07 525,or an 08 535? When I get this inspected is it going to be altered? Can I still run a flash or piggybacks? Sorry for all the all the questions, but you know this. Thank you.

[Hobbs64]

All I'm going to say is direct injection verses not direct injection. Junior, I will be interested to see how your project turns out, It looks far more difficult than mine.

Back on topic, Lang racing and CP are putting together pistons for my project...