- #6 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [neglex]
by nhhawk6
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Jan 03, 2009 (9:50 am)
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Replying to: neglex (Jan 03, 2009 4:50 am)
The RDX has SH-AWD. You are correct. It is NOT mated with the Active Dampening Suspension system of the MDX. The RDX is lighter, shorter, and narrower than the MDX, and is not able utilize the SH-AWD to it's ability. The RDX is NOT a smaller version of the MDX. They are VERY different vehicles. As long as you realize that, I think you will be happy with your choice of the RDX.
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- #7 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [nhhawk6]
by wwest
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Jan 03, 2009 (11:30 am)
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Replying to: nhhawk6 (Jan 03, 2009 9:50 am)
"..and (the RDX) is not able to utilize the SH-AWD to it's ability.."
What, WHAT...??!!
Wasn't the SH-AWD first introduced/adopted/adapted for the RDX and then later used to UPGRADE the MDX.
Yes, the MDX is HEAVIER and therefore more overall traction coefficient on equally slippery surfaces but otherwise the VERY SAME SH-AWD system.
"The RDX is NOT a smaller version of the MDX.."
And we can thank the powers that be for that..!!
If you don't need, or rarely need, the extra space, and can do without the clunky harsh ride of the MDX, then the RDX would be a perfect purchase.
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- #8 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [wwest]
by nhhawk6
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Jan 03, 2009 (1:19 pm)
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Replying to: wwest (Jan 03, 2009 11:30 am)
And we can also be thankful that we make our own judgments and buy our OWN vehicles. I would never expect you to buy an RDX for me, and I would never buy an MDX for you. Best of luck.
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- #9 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [nhhawk6]
by indyking
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Feb 27, 2009 (7:01 am)
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Replying to: nhhawk6 (Jan 03, 2009 4:01 am)
No question the MDX is an excellent car, but if you don’t need the extra space and the DVD rear entertainment system, the additional $12,000 paid for the MDX compared to the RDX is really a waste of money! That difference in price is almost the cost of a basic Honda Fit!!! No offense, but both cars are indeed very similar! The SH-AWD is exactly the same in both, but actually first developed or the RDX, not the MDX! The RDX is also turbo with a better sporty handling compared to the MDX, but indeed a bit noisier too. Finally, the RDX also deliver slightly better gas mileage, not a bad thing in these days!
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- #10 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [indyking]
by wwest
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Feb 28, 2009 (2:30 pm)
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Replying to: indyking (Feb 27, 2009 7:01 am)
"..RDX also deliver slightly better gas mileage..."
I would bet NOT.
The clear majority of the time the RDX's engine runs in derated/detuned "off-boost" mode. In order to allow for the increase in "effective" compression ratio when boost comes on the native compression ratio must be lower that it would be absent the turbo 'feature".
Obviously, like the CX-7, they could have used a form, combined form, of the Atkinson/Miller cycle. Have a "native", just cruising along, compression ratio of 10:1 (12:1 for the CX-7) and then use the intake valve closing delay technique to keep the effective on-boost compression ratio within tolerance.
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- #11 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [wwest]
by teledatageek
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Mar 01, 2009 (2:20 am)
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Replying to: wwest (Feb 28, 2009 2:30 pm)
At one time, I owned both an MDX and an RDX. My recollection was the mileage was  the same. I think the RDX was a little better with highway driving.
But... depends on how spirited your driving was. The RDX is more tempting than the MDX....
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- #12 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [wwest]
by indyking
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Mar 02, 2009 (6:02 am)
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Replying to: wwest (Feb 28, 2009 2:30 pm)
Hi wwest, your explanation for the fuel consumption looks good and it only proves how ignorant I'm when it comes to car mechanics; however, my argument for "slight better gas mileage” in the RDX compared to the MDX is rather based on the real facts. Go to fueleconomy.gov... if you don't know this website yet, you should. It contains MPG data from real drivers and you can see in the website that indeed the RDX gets a better MPG than the MDX overall, not a lot better, but just “slight” like I said... considering the Turbo in the RDX, the better MPG is very nice! Also the RDX has "slight" better MPG in the new EPA estimates compared to the MDX. The old EPA estimates were useless but I actually find the new numbers very reliable since they match almost perfectly with what I get in my CR-V and Odyssey.
So, once again, the RDX and MDX should not be competitors... like I said, if you need more room, a DVD entertainment system, and have extra 12K to burn, the MDX is the way to go, but if you're like me, who don't really think the extras in the MDX worth 12K, the RDX is a no-brainer.... the RDX is a very similar car, with all the cool toys like the MDX, a nice sporty drive because of the turbo engine, better MPG, and have I told you the RDX has better looks too?
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- #13 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [indyking]
by wwest
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Mar 02, 2009 (8:50 am)
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Replying to: indyking (Mar 02, 2009 6:02 am)
Yes, add DFI to the RDX engine and reduce the instrument panel/dash "clutter" and the RDX would be on my "list" instead of the CX-7.
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- #14 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [indyking]
by ozzynyc1
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Mar 02, 2009 (6:14 pm)
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Replying to: indyking (Mar 02, 2009 6:02 am)
You obviously haven't driven RDX AND MDX....It's like comparing driving a mercedes and then kia...RDX drives like crap, it's stiff and bumpy....It's nothing like TL or MDX....MDX is WORTH 12K MORE...It's a 7 seater, it has a sporty, SUV suspension, that's not bumpy, yet not too plus like Lexus..RDX felt like driving a honda civic...CHEAP.... 
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- #15 of 17
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Re: Acura MDX vs. RDX vs. Lexus RX 350 [ozzynyc1]
by wwest
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Mar 03, 2009 (12:31 pm)
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Replying to: ozzynyc1 (Mar 02, 2009 6:14 pm)
RDX is light enough that its suspension can be tuned for "sporty" driving. MDX is such an "old folks" "Queen Mary" that it cannot. At those prices, unless I saw real need for the SH-AWD system vs the new RX F/awd system (I don't) I'd be buying a new 2010 RX350 rather than a "cushy", too softly sprung, MDX.
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