BMW's New 500-HP S58 Inline-Six Should be Very Interesting to Supra Fans
02-13-19, 01:23 PM
#1
Lead Lap
Thread Starter
BMW's New 500-HP S58 Inline-Six Should be Very Interesting to Supra Fans
Jalopnik: https://jalopnik.com/bmws-new-500-hp...sti-1832589427
If you’re curious where I’m getting these specs from, they’re straight from BMW spec sheets. The S58’s can be downloaded here, the B58’s technical training PDF can be downloaded here.
- 3.0 liters, but not exactly the same as the B58. The S58 has a slightly larger bore and shorter stroke (84.0/90.0) compared to the B58 (82.0/94.6). Displacement is technically down five cc, and it’s still an undersquare engine. Theoretically the new engine should have room for bigger valves, better breathing, and should be more rev-happy, but we’ll learn more in time.
- 7,200 RPM redline, up from 7,000 on the B58.
- Twin-turbo, as opposed to single on the B58. Confusingly, the B58 is a twin-scroll turbo, with two separate sets of exhaust runners independently running into one turbocharger. BMW calls this “TwinPower Turbo.” The S58 also splits the exhaust, but half the cylinders run into one single-scroll turbo and the other half into another. BMW also calls this, and I cannot stress how dumb this is, “TwinPower Turbo.”
- Compression ratio down to 9.3:1 versus the B58’s 11:1. This sounds bad to people obsessed with naturally-aspirated engines, but makes sense to those familiar with running boost.
- 473 HP and 442 lb-ft of torque in base trim.
- 503 HP in Competition trim, also with 442 lb-ft of torque.
- According to the BMW USA media site, max power is made from 5,600 to 7,300 RPM (this is, oddly, above redline) in base trim and 5,950 to 7,300 RPM in Comp trim, though it’s worth noting that the spec pages on the global media sitesay max power occurs at 6,250 RPM (the bump in the plots below could explain this).
- Max torque is made from 2,600 to 5,600 in the X3 M and X4 M, but 2,600 to 5,950 in the Competition models.
- BMW advertises a forged crankshaft on the S58, as well as Valvetronic variable valve timing and Double-VANOS variable cam timing, but the B58 also has a forged crank and Valvetronic and also Double-VANOS, as noted when the B58 won an award back in 2016.
- The S58 is a closed-deck engine, just like the B58 and also like the Toyota 2JZ. Closed-deck blocks have metal all the way around the cylinder bore rather than open cooling jackets, and are thus stronger. Tuners can read that as more boost-friendly.
- High fuel injection pressure of 350 bar (this is the same as the pressure mentioned in the BMW X5’s B58 specs), which BMW Blog notes offers better fuel distribution and efficiency.
- New oil pan with more chambers to keep good oil flow in corners.
- New intake.
- New oil cooler.
- New intercooler that’s “indirect” and doesn’t appear to be mounted right in the middle of the intake as on the B58. Confusingly, BMW also refers to the B58’s intercooler as “indirect,”(likely a reference to the fact that both intercoolers are fed liquid coolant) and it also appears that the S58’s is integrated to some degree, just not right in the middle of things.
- 3D printing technology used inside the cylinder head. BMW’s a little vague about what this exactly entails, stating in its press release that “the cylinder head has a core manufactured using 3D printing. This additive manufacturing process enables geometric forms to be created that are beyond the capability of conventional metal casting techniques. 3D printing technology has cut the weight of the new engine’s cylinder head core and allows its coolant ducts to be routed in a way that optimizes temperature management.” You can at least see what it looks like in BMW’s production video at about 16 seconds in:
02-13-19, 01:24 PM
#2
Lead Lap
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02-13-19, 07:38 PM
#7
Lexus Test Driver
BMW makes bulletproof inline 6 engines - none of them have issues.
Current S55 thats in M3/4 has been amazing as far as Reliability even with tuning, downpipes etc.
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02-13-19, 07:41 PM
#8
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02-13-19, 07:51 PM
#10
Lead Lap
it won't be interesting to supra fans, since as far as supra fans are concerned we're still waiting for the MK V to be announced
02-13-19, 08:59 PM
#11
The supra engine was thoroughly inspected and tested by the japanese team though. Their one responsibility it seems in this "joint" project, so we know that one is bulletproof.
02-13-19, 10:28 PM
#12
Lexus Champion
Questioning whether a BMW engine will be reliable is perfectly reasonable. What about the early 2000s M3 and the issues with that 333hp I-6? Insane redline but you couldn't approach it bc the engine would blow after enough times. I will say, however, that probably their sixes are the most "reliable", because BMW V8s are awful, and their V10s don't even make it to 50k miles before throwing rods.
02-14-19, 05:22 AM
#14
24 common issues on the older turboed 6s
https://www.e90post.com/forums/showthread.php?t=605631
02-14-19, 06:43 AM
#15
Lexus Champion
It's an interesting bit of tech/engine discussion about the B vs the S, but neither of the Z4/Supra twins is getting this motor anyways. BMW would never let Toyota have this in the Supra. And there isn't going to be an M version of the Z, so really it's talk about a motor that's going in other M products.