Oppopoll

"1337HPMustang" (1337hpmustang) 08/03/2014 at 18:31 • Filed to: oppopoll

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Do you prefer more power through a larger displacement/higher revving motor (staying N/A) or forced induction?

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LappingLuke > 1337HPMustang 08/03/2014 at 18:33

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I prefer reasonable, appropriate horsepower levels for a lighterweight chassis. This goal is easily achievable without forced induction and gives (for me) the best sound and best performance.

Kanaric > 1337HPMustang 08/03/2014 at 18:34

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For a car as a daily driver I prefer naturally aspirated. For fun I prefer turbo. Have a Mustang GT daily and rwd Skyline for fun.

Twingo Tamer - About to descend into project car hell. > 1337HPMustang 08/03/2014 at 18:39

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My 70 rampaging horses are created by boost, so I'll have to go with that.

Firewrx234 > 1337HPMustang 08/03/2014 at 18:42

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You can't beat a naturally aspirated 'Merican V8:

Brian Silvestro > 1337HPMustang 08/03/2014 at 18:45

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I like N/A motors with electric battery assistance.

Denver Is Stuck In The 90s > 1337HPMustang 08/03/2014 at 18:47

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I want a Blown, Supercharged, Turbo 6.7l Hemi V12 Rotary With 11lbs of Boost. Mmmkay? And I want it in a Miata

DoYouEvenShift > 1337HPMustang 08/03/2014 at 19:13

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Cant it be both? I say yes!!!

GhostZ > 1337HPMustang 08/03/2014 at 19:23

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An N/A engine can feel like a boosted engine and vice-versa. I think a better question to ask is "average power, or peak power?"

For example, a large displacement low-revving engine can have tons of average torque but not a high peak power output. The powerband is more flat and linear.

Also, for this post, "large displacement" means "large bore compared to its stroke" and high revving means "revs high for its stroke", since two engines with the same displacement, but different bore/stroke ratios are going to feel very different.

Large Displacement + Low Revving + No Boost = flat, powerband, low peak output (Think Dodge 440)

Large Displacement + High Revving + No boost = linear powerband, high peak output (Think SOHC Cammer or NASCAR engine)

Small Displacement + Low Revving + No Boost = flat powerband, low overall output (Think Miata engine)

Small displacement + High revving + No boost = very peaked powerband, low peak output,low average output (Honda B18C, most motorcycle engines)

Large Displacement + Low Revving + Boost = flat, linear powerband, low peak output (compared to higher revving versions) high average output (ZL1, ZR1, GT500 engines)

Large Displacement + High Revving + Boost = peaked powerband, extremely high peak and average output (Koenigsegg motors, Hellcat motor, Top Fuel engines)

Small Displacement + Low Revving + Boost = linear powerband, low overall output, high average output (Ecotech LUV 1.4, Fiat Multiair)

Small displacement + High revving + Boost = very peaked powerband, very high peak output, very low average output (Nissan RB26DETT, SR20DET, early Porsche 911 turbo motors)

That being said, I've always been a fan of small displacement, high RPM, high boost motors, so while I'm voting for "boosted" it comes with the caveat that it must be on a high RPM engine, a small engine that uses boost to avoid having to rev high does nothing for me.

GhostZ > Firewrx234 08/03/2014 at 19:26

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Except with a turbo 'Merican V8:

1337HPMustang > DoYouEvenShift 08/03/2014 at 19:26

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hence the hennessey gts

Vi517, JDX Racing > 1337HPMustang 08/03/2014 at 19:26

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I would like to say N/A, but they just can't compete with turbos at high altitude. The power drop in N/A cars at 10,000 ft is very noticeable, while turbos keep most of their power. That's why P-51 Mustangs (and most high performance prop airplanes) use forced induction! :)

GhostZ > Denver Is Stuck In The 90s 08/03/2014 at 19:27

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Remove the "rotary" demand and the rest is totally possible. Although no one would actually twincharge an engine for only 11 lbs of boost. Think 30lbs.

You'd probably use a Jaguar V12, custom make some hemispherical heads for it, throw on a clutch-driven supercharger, then feed it with a turbo. Supercharger kicks in over a certain RPM. With your demands, you'd probably do a 3.7l bored block, and then custom-make a 3.15" crank for a total of 406 ci (6.7l). You can probably then make peak power around 7000.

30lbs @ 7000rpm on 6.7l results somewhere north of 1300HP.

JGrabowMSt > 1337HPMustang 08/03/2014 at 19:34

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I bought a HEMI, not a helicopter.

High altitude doesnt bother me, just dont race on mountains. More room to go faster down at the bottom anyway.

Boost has its place, and Id love to go Supercharged one day, but for now, Im satisfied with my 380HP being all displacement. My friends Fury is all motor, and is good for more than double what Ive got. Good enough for him.

Firewrx234 > GhostZ 08/03/2014 at 19:39

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That's sick!

But I'd still miss the NA burble ;)

1337HPMustang > GhostZ 08/03/2014 at 19:41

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you're very right, but I drew the distinction at using a compressor or not to avoid making the question too convoluted. That said, there are unique qualities to each that can't be made to feel like the other (anti-lag popping, blow off valve sounds, the shrill singing of a v12, the burble of a pushrod v8). I myself love rotaries which are probably the peakiest motors out there so I'm guessing you may be a fan of those too.

samssun > 1337HPMustang 08/03/2014 at 19:48

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Displacement is a fundamental limitation of an engine. Boost can mitigate it but only acts as a partial multiplier of that limit. Reasonable displacement (at least 3 liters) enhanced by boost is my preference...gotta be able to get moving off-boost, and provide enough flow to spool the turbos.

 V8 Rustler > 1337HPMustang 08/03/2014 at 19:52

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N/A and large displacement because of simplicity.

GhostZ > 1337HPMustang 08/03/2014 at 19:53

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The peaks of rotaries are nothing compared to that of a highly built RB26DETT:

13B:

RB26DETT (and this is at a lower power output)

phoenixbondoob > DoYouEvenShift 08/03/2014 at 20:06

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Denver Is Stuck In The 90s > GhostZ 08/03/2014 at 20:15

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I was just being strange, but that actually sounds cool!

Jayhawk Jake > 1337HPMustang 08/03/2014 at 20:18

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I don't have a whole lot of experience with the really high powered of either option, but I picked boost.

Why? Blow off. It's too much god damn fun. When I test drove a corvette it was epic and sounded like a demon, but I missed hearing something when coming off throttle. There's a lot of fun in the current crop of little turbos too, my car has no power down low then catches you by surprise when the 23 pounds of boost come on.

Actually, I guess my answer is both. I want both.

jdrgoat - Ponticrack? > GhostZ 08/03/2014 at 20:46

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Large Displacement + High Revving + Boost = peaked powerband, extremely high peak and average output (Koenigsegg motors, Hellcat motor , Top Fuel engines)

I can't say I could call the Hellcat a high-revving engine, especially if you call the ZR1 low-revving. Check some pictures, the ZR1 redlines at 6500, and I'm not sure if the Hellcat even does 6000, it looks like 5800 possibly in the shots I've seen.

GhostZ > jdrgoat - Ponticrack? 08/03/2014 at 21:08

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Good point, I forgot that despite its short stroke, the Hellcat motor isn't untapped RPM-wise.

tc_corty > GhostZ 08/03/2014 at 21:50

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Nicely put. Shame people don't circle jerk over posts like these, its lacking the band wagon buzzwords that everyone faps over lol.

GhostZ > tc_corty 08/03/2014 at 21:53

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MERICAN MUSCLE OR IMPORTS BRO?

NO REPLACEMENT FOR REPLACEMENT BRO!

GOT 200HP FROM A CHIP, BRO

BEAT EVERY FART-CAN CIVIC AT THE WAL-MART PARKING LOT, BRO!

AMERICAN'S CAN'T TURN RIGHT, BRO.

Oh my god shut the fuck up

tc_corty > GhostZ 08/03/2014 at 22:04

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87 people recommended your post

davesaddiction @ opposite-lock.com > 1337HPMustang 08/04/2014 at 09:47

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Where would you draw the line between small displacement and large displacement?

Mine's a V8, but it's just 4 liters and revs past 8000. Almost like I've got two high-strung Honda 2.0s in there - ha! If you want to have fun, the motor definitely motivates you to keep your revs up around 4k even when cruising around town, and wringing it out never gets old.