BMW F80 M3 / F82 M4 Complete Technical Docs (With S55 Engine Guide)

[dondula]

on the first pdf link page 54 to 55 is everything you guys need to know about launch control

[irablumberg]

This is great stuff. However, unless I missed it, there is no mention of the torque spec for the wheel bolts. Anyone have any ideas about that torque spec?

[saxonb]

Originally Posted by Rev ///Me

Very useful. Lots of good information!

Complete F80 M3 / F82 M4 technical docs and S55 engine technical doc.

PDF documents for download:

New AMG GT 4.0 TT V8 engine is only 8 pounds heavier than the S55!

[elitex]

Originally Posted by saxonb

New AMG GT 4.0 TT V8 engine is only 8 pounds heavier than the S55!

Really?

[JoeFromPA]

Fun Random Stuff I liked reading/discovering:

- The catalytic converter's heat shields are made out of Aluminum-Magnesium, saving 3.3 pounds
- There are two oil pumps in the pan (I knew there were two pick-up points, didn't know two pumps). The second pump is a suction pump that specifically sucks oil out of the turbos to prevent oil from sitting in them.
- The closed deck engine + Arc-sprayed cylinder liner reduced engine weight by 4.85 pounds.
- The crankshaft is ~4 pounds lighter
- Despite closing the deck, between the cylinder liner changes and crankshaft changes and the oil pans changes they shaved about 11 pounds off the engine compared to the N55 in the M235i (that's really pretty significant)

- If oil is present in the turbos, it may be because the CCV system has a leak in it due to faulty seals. If it's the crankshaft seals, it may create oil consumption of 3.2 quarts per 621 miles.....hehehe

- The engine cover weighs 2.1 pounds less than the N55 engine cover and is considered an "anti-corrosion" cover.

- The oil sump/pan is installed using aluminum screws. They are one-time use screws.

- The rod bearings are lead-free. This means if you are doing oil analysis and see lead show up, it's not from the rod bearings as would traditionally be assumed.

- Pistons are made by Mahle

- Despite being an line six, engine has a big-arse vibration damper on it

- BMW says that the two turbos in the S55 weigh the same as the ONE turbo in the N55. Not even sure how this is possible.

- If I'm reading this right, the engine oil cooler is the radiator at the lowest point to the ground and laying flat. Odd design to me; guessing there is underbody routing of air to that radiator at the front lower grill/air dam.

- The coolant capacity of the intercooler is 4 liters or about 1 gallon. That amount of fluid is routed through 2 radiators. I can't imagine that water to air intercooler heat soaking much considering the sheer volume of heat-radiating surface area.

....

That's it for now.

[Caelric]

Originally Posted by JoeFromPA

- If I'm reading this right, the engine oil cooler is the radiator at the lowest point to the ground and laying flat. Odd design to me; guessing there is underbody routing of air to that radiator at

That is definitely something to consider as companies start coming out with different front airdams/bumpers/front fascias. Don't want to interrupt air flow to important coolers

[Powaup]

Originally Posted by mkoesel

This is great. The S55 / N55 comparison in the second document is very nice and will come in handy for keeping the misinformation and mud slinging in check.

[bradleyland]

Originally Posted by JoeFromPA

- BMW says that the two turbos in the S55 weigh the same as the ONE turbo in the N55. Not even sure how this is possible.

That is pretty crazy. I've looked at cut-aways of the twin-scroll turbos, and they use a lot of material to accomplish the dual-inlet geometry. All that material is cast iron, because it's routing the hottest gasses in the turbocharger. I still don't see how that can be equal to the weight of two whole turbochargers though.

Maybe they mean the entirety of the turbocharging system. They might have went on a weight saving binge elsewhere: compressor housings, wastegates, collectors, etc.

[GrussGott]

Originally Posted by JoeFromPA

Fun Random Stuff I liked reading/discovering

Nice write up! Keep it comin!

[signes]

Cool stuff. Do docs like this exist for the E9x / S65?

I liked the reminder of the logic behind the engine codes. S55B30...

[JoeFromPA]

Originally Posted by bradleyland

That is pretty crazy. I've looked at cut-aways of the twin-scroll turbos, and they use a lot of material to accomplish the dual-inlet geometry. All that material is cast iron, because it's routing the hottest gasses in the turbocharger. I still don't see how that can be equal to the weight of two whole turbochargers though.

Maybe they mean the entirety of the turbocharging system. They might have went on a weight saving binge elsewhere: compressor housings, wastegates, collectors, etc.

They said the turbos specifically - that the N55 single twin scroll turbo weighed ~31 pounds (going off memory) and the TWO turbos of the S55, combined, weigh that.

And to me, including ducting would actually hurt the S55's case...

[ynguldyn]

Originally Posted by signes

Cool stuff. Do docs like this exist for the E9x / S65?

Of course they do. And while these new pdfs took a bit of sleuthing to discover, the older stuff is googleable. Search for "bmw st609" and "bmw st709"

[TruthGuY]

Very Useful Information...Thanks

[JoeFromPA]

Some more cool stuff:

- Near the front radiators is an aluminum cross-bracing to increase rigidity at the front vertical axis of the vehicle. This is in addition to all the other front bracing we've seen and the knowledge that the belly pan itself is a structural bracing.

- Sound insulation was deleted in the passenger side of the engine compartment. So this was some weight savings at the expense of interior volume in one particular area.

- The document references an F3X M3 NUMEROUS times....I thought once was a typo, but c'mon people.

- There is extensive new heat insulation on the underbody, including a new heat insulation under the trunk/luggage compartment due to the muffler placement. No more information about this that I see.

- The rear seat back changing to a 60:40 design with no pass-through, and different seating design, saved 6 kg /13.2 pounds - pretty significant.

- The manual trans is now a dry sump unit. News to me? Where is the sump located and how easy is it to drain and re-fill? Could be very nice for the DIYer.

- Auto-rev match can be turn-off by the diagnostic system. Thus, expect coding options here..

-No new information on the double-disc clutch put in the manual trans. ARGH!!!

- Launch control is not supposed to be used for 3,100 miles/5000km

- You can modify the launch control settings for take-off RPM via cruise control. Cool. Up to 500 rpms +/-

- The CV joints and trunnion mounts are drilled hollow. First time this was done on an M vehicle.

- In the rear suspension alone, the trailing arms and wheel carriers use a new forged aluminum production saving 6.6 pounds compared to the e9x m3. This impresses me because these have got to be handling greater forces, IMHO, and that's alot of weight savings in those two pieces...

- One pad wear sensor in the front, one in the rear. I prefer this over one pad wear sensor at each corner, personally.

- The LI-Ion battery is expected to live 2x as long (wow). So maybe 100k miles/8-10 years on average? If so, the expense of the battery is better justified...

...

Overall, I'm impressed by all the little weight savings. You know they tried hard to reduce weight and were very successful. At the same time, they added ALOT of bracing and ALOT of cooling.

Good stuff.

[bimmerbuff]

Originally Posted by ynguldyn

Of course they do. And while these new pdfs took a bit of sleuthing to discover, the older stuff is googleable. Search for "bmw st609" and "bmw st709"

I've been trying to do this for the F22, without success. Any Googling tips?

[GarlicBun]

Thank you so much for these!!!

[Carbon-M]

…..

[SYT_Shadow]

Originally Posted by ynguldyn

Of course they do. And while these new pdfs took a bit of sleuthing to discover, the older stuff is googleable. Search for "bmw st609" and "bmw st709"

I searched, didn't find anything here

[ynguldyn]

Originally Posted by bimmerbuff

I've been trying to do this for the F22, without success. Any Googling tips?

You won't be able to find anything recent with a Google search. In any case, I don't think F22 course has been published yet.

[ynguldyn]

Originally Posted by SYT_Shadow

I searched, didn't find anything here

I get the correct links as the first hit in both cases, with both personalized and non-personalized search.

[Dackelone]

@ynguldyn
Of course they do. And while these new pdfs took a bit of sleuthing to discover, the older stuff is googleable. Search for "bmw st609" and "bmw st709"

Originally Posted by SYT_Shadow

I searched, didn't find anything here

@ynguldyn some people have to be spoon fed...

bmw st609
http://prodcds.bmwuniversity.com/lib...%20Engines.pdf

bmw st709
http://prodcds.bmwuniversity.com/lib...0%20Engine.pdf

[M3 Adjuster]

Originally Posted by Carl L

Awesome thread.

The standard steel brakes are 15" front and 14.5" rear. Added to this is the fact they are 4-piston and 2-piston respectively. The F10 M5 only has single piston rears while the E9x was single piston all round and a half inch smaller both front and rear. Very much looking forward to this brake setup for my track days, finally the Porsche guys won't be laughing at how I needed to mod the stock system just to run consecutive laps.

BMW has used single piston calipers for decades.

The first BMW vehicle to recently have multiple piston calipers was the 135 which had multi piston setups that were not as good as the brakes on your e9x and 1M.