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  TOV News > Acura Set to Launch More Powerful, Technologically Advanced and Luxuriously Equipped 2016 Acura ILX > > Re: Peak Torque at 3600 rpm?

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iutodd
Profile for iutodd
Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 17:56
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Unless the press release is wrong it says that peak torque is at 3600 rpm. The TLX K24 has peak torque at 4500.

That is a fairly sizable shift and represents the earliest torque peak I can remember seeing for a NA engine (though I'm not the most experienced)...does any body have any insight on what's happening here?

Hondarulez
Profile for Hondarulez
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 18:15
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iutodd wrote:
Unless the press release is wrong it says that peak torque is at 3600 rpm. The TLX K24 has peak torque at 4500.

That is a fairly sizable shift and represents the earliest torque peak I can remember seeing for a NA engine (though I'm not the most experienced)...does any body have any insight on what's happening here?



I'm not sure if that's a typo, but here are a few comments.

The 2G TL-S that I had before was rated at 232lbft@3500-5500rpm. So 3600rpm isn't the earliest torque peak for a NA engine.

Honda's NA engines typically have a very flat torque curve. My guess is that, even though the TLX K24 is rated at 182lbft at 4500rpm, it probably is making 180lbft or more from 3500-5500rpm, it's just that the peak torque of 182lbft occurs at 4500rpm.

While the peak torque is rated at 180lbft at 3600rpm for the ILX, that engine is probably making 179 at 4500rpm.







auto_enthu
Profile for auto_enthu
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 18:49
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The peak torque RPM caught my attention too.
I can't remember seeing any non-Turbo engine with such low RPM for peak torque.

Perhaps, as 'Hondarulez' mentioned above, it may not be a typo.

It may have been tuned slightly differently than the one in TLX, and may not be significant if the torque curve is mostly flat and does'nt drop too much atleast until 5000 rpm.


iutodd
Profile for iutodd
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 19:25
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Looking at Jeffs dyno of the K24 in the Accord the torque does peak pretty early.
Hondatalover
Profile for Hondatalover
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 20:23
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The Accord peak torque hit around 3,900-RPM. The TLX's is said to be 4,500... not sure about that. The old K24 was a peaker at 4,500, so perhaps THAT was a type since the current K24 in the Accord and now ILX reach it around 3,600-3,900..

The TLX did receive a 'dramatic' mapping over the Accord's K24w to make 206HP vs 185HP with no major mechanical changes as far as I am aware of. That will modify the torque curve a good bit you would think.. but how would the K24w in the ILX, supposedly a carry over from the TLX, make only 5HP less than the TLX's with more torque and at a lower rpm with supposedly the same mapping?

Exhausts... the ILX still has a single exit and different exhaust routing than the TLX's dual exit. So perhaps better exhaust flow helps just that much.....

And maybe Acura did tune things a bit differently...


Waldo
Profile for Waldo
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 21:31
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The lower RPM torque point may be because Acura still sees the ILX as an urban car, rather than a highway cruiser. This should give it a livelier feel at around town speeds.
NoBrainer
Profile for NoBrainer
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-20-2014 22:44
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As the TLX has a slightly higher C.R. I think the crown is different. They share the same camshafts?

outersquare
Profile for outersquare
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-21-2014 13:39
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A18A

110 hp (82 kW) @ 5800 rpm
112 lbft (152 Nm) @ 3500 rpm

http://en.wikipedia.org/wiki/Honda_A_engine


For the ILX K24, probably a combination of intake manifold resonance and VTC tuning. I saw somewhere that the new DI engines have an even wider VTC adjustment range (55 degrees?).


Fan Koni
Profile for Fan Koni
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-23-2014 14:49
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Waldo wrote:
The lower RPM torque point may be because Acura still sees the ILX as an urban car, rather than a highway cruiser. This should give it a livelier feel at around town speeds.

Well I thought the opposite, give it highway mileage to target the small diesels.

CarPhreakD
Profile for CarPhreakD
Re: Peak Torque at 3600 rpm? [View News Item]    (Score: 1, Normal) 11-23-2014 15:20
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If you have an extremely flat torque curve, it doesn't really matter where you put the peak torque, because there is likely to be a band from 1800 rpm to near redline with almost a flat torque plateau. End of the day, the "peak torque" rating isn't representative of the engine's performance.

 
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