Who needs diesel? SkyActiv-X HCCI sounds awesome

[93JC]

And that's not accounting for differences in how the throttle pedals are calibrated.  It's easy to make a car "feel" quicker simply by calibrating the pedal more aggressively (e.g., open the throttle by 40 or 50% when the pedal is only depressed 1/4 of its stroke).

Something I complained about in my test drive of a MkV GTI (2009)...

My buddy's Golf Wagon (2015 or '16) isn't bad for it though, but his 1.8 TSI doesn't feel any more spritely than my 2.5 L (non-SkyActiv) Mazda 3. Which makes sense, because mine's 167 hp and his has a scant 3 hp advantage over it.

[MrH]

Just imagine a 2.0 liter, making something like 170 hp, 200 lb/ft of torque, in an ND Miata, getting 55 mpg on the highway

[Xer0]

That engine would rev to like 5K RPM and ruin half the fun of a Miata.

[12,000 RPM]

Yea it needs to zing

Mazda needs to take more advantage of that 14:1 or whatever compression ratio.... let that motherfucker wind out like a rotary.

[AutobahnSHO]

That engine would rev to like 5K RPM and ruin half the fun of a Miata.

?? You saying high revs are bad?

[giant_mtb]

?? You saying high revs are bad?

No, he's saying that such a compression ignition engine would only be able to make it to about 5k revs (think diesel), which takes half the fun (rev range) out of a normal Miata.

[AutobahnSHO]

No, he's saying that such a compression ignition engine would only be able to make it to about 5k revs (think diesel), which takes half the fun (rev range) out of a normal Miata.

Gotcha!  That would indeed suck. Nothing like revving my SHO up to 7k back when I had it.

[Soup DeVille]

No, he's saying that such a compression ignition engine would only be able to make it to about 5k revs (think diesel), which takes half the fun (rev range) out of a normal Miata.

That may be a false assumption.

[giant_mtb]

That may be a false assumption.

Could be.

[Xer0]

That may be a false assumption.

I hope it is.

[12,000 RPM]

First drive (trigger warning: Jalopnik content)

http://jalopnik.com/mazda-s-holy-grail-of-gasoline-engines-is-completely-1801820285

They really get in depth. Fascinating stuff

[FoMoJo]

I don't think I really want any more energy transferred to my pelvis .

[Laconian]

I love Mazda. I hope they never die.

[68_427]

Just imagine a 2.0 liter, making something like 170 hp, 200 lb/ft of torque, in an ND Miata, getting 55 mpg on the highway

Rumors are 187hp and 170 lb/ft

[r0tor]

All this tech + a supercharger... and only 187hp?  - yawn-

[12,000 RPM]

It does seem to be a bit much for those numbers. VW 1.8T is not far off in fuel economy while making a buttload more torque and power.

[Laconian]

Nah. The Mazda engine looks like it'll be making in the city what VW does on the highway (38-39mpg). And it'll do on the highway what VW does... IN ITS DREAMS! (SICK BURN)

[MX793]

All this tech + a supercharger... and only 187hp?  - yawn-

Probably only revs to 4000 RPM.

[Laconian]

No Y-axis, but it looks like its redline is just short of the Skyactive-G's...

[MX793]

Hmm, based on the curve shapes, I'm guessing the blower is there to help with low RPM and isn't providing much compression at higher RPM.

[MrH]

The blower isn't really a supercharger in a conventional sense.  It's to prevent throttle loss, that's about it.

[MX793]

The blower isn't really a supercharger in a conventional sense.  It's to prevent throttle loss, that's about it.

Odd that they'd bother with the liquid to air intercooler, then.  Just pumping air doesn't introduce the same amount of heat as actually compressing it.

[MrH]

Yeah, I was thinking the same thing.  Maybe it's to provide a more consistent intake temperature?  The controls on this thing have to be wild.  I imagine they're trying to reduce the variables as much as possible.

[12,000 RPM]

https://jalopnik.com/be-amazed-by-this-video-showing-the-inner-workings-of-m-1819890045

[Galaxy]

The blowers primary reason is to help regulate the pressure in the engine, which would also explain why the temperature needs to be controlled.