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Acura RDX

2722 messages,  Last post on Sep 25, 2009 at 12:58 PM

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What is this discussion about? Acura RDX, Concept Cars, SUV

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#2663 of 2722 Re: downshifts [lynn3808] by bodble2 Jun 16, 2008 (11:41 am)
Replying to: lynn3808 (Jun 16, 2008 5:27 am) I can't imagine there are that many 1+ year old cars with over 50,000 miles on the odo. Perhaps the turbo failures had to do with heavy usage? Replies to this message: wwest (Jun 16, 2008 12:18 pm)
#2664 of 2722 Re: downshifts [bodble2] by wwest Jun 16, 2008 (12:18 pm)
Replying to: bodble2 (Jun 16, 2008 11:41 am) Actually 50,000 miles in one year implies primarily hwy miles, cruising miles, and therefore relatively LOW useage of the turbo.   Wastegate failure due to poor design would be my guess.
#2665 of 2722 87 Octane Acceptable? by mfeirman Jun 17, 2008 (6:24 am)
Looking into leasing 2008 RDX. Wil the turbo engine accept 87 octane gas? Or do I really need to feed it 91?   Considering Infiniti FX35 as alternative. Replies to this message: ptd1 (Jun 17, 2008 6:45 am) wwest (Jun 17, 2008 9:08 am) wwest (Jun 17, 2008 8:58 am)
#2666 of 2722 Re: 87 Octane Acceptable? [mfeirman] by ptd1 Jun 17, 2008 (6:45 am)
Replying to: mfeirman (Jun 17, 2008 6:24 am) I've been using it w/ no prob., but I live near Denver at 6500 ft. where the octane is not so important. Also, I get this downshift thing for no known reason. I read one article that the low octane could affect the grade logic system, and cause inapproprriate downshifts. I like the vehice though. Replies to this message: wwest (Jun 17, 2008 9:08 am)
#2667 of 2722 Re: 87 Octane Acceptable? [mfeirman] by wwest Jun 17, 2008 (8:58 am)
Replying to: mfeirman (Jun 17, 2008 6:24 am) Almost any high compression modern day engine will "willingly" accept regular fuel. With the advent of EFI and now more sensitive non-resonant knock/ping sensors the only result might be a bit lower FE.   Apparently even in Denver where the air is so much thinner and therefore the use of premium fuel is more important for keeping the engine HP/torque up to "snuff". If the ECU cannot abate knock/ping via increasing the A/F ratio it will command a downshift more often.
#2668 of 2722 Re: 87 Octane Acceptable? [ptd1] by wwest Jun 17, 2008 (9:08 am)
Replying to: ptd1 (Jun 17, 2008 6:45 am) "Denver at 6500 ft. where the octane is not so important."   The primary difference at 6500 ft (Denver, 6500 ft...??) is that even at WOT the cylinder will NEVER get a full "charge", a full fill of A/F mixture, therefore almost never encounter engine knock/ping due to low octane, even in a relatively high compression engine.   But at higher elevations it is even more important to match premium fuel with a high compression engine in order to keep the engine performance, HP/torque, within "reason" and thereby avoid the continuous downshifts that results.   But other than the "nuisense" of the too often downshifts there will be no adverse results.
#2669 of 2722 Re: downshifts [wwest] by suvsearcher1 Jun 18, 2008 (7:42 am)
Replying to: wwest (May 31, 2008 9:21 am) Maybe you are right, but it is sometimes annoying when it downshifts abruptly like that. I have a 2008 RDX and for first 5000 miles or so I did not notice the downshift but I have been noticing it often nowdays on the local higways when I am driving between 45 and 50 mph. It feels as if the engine is cut off and it has downshifted from 5th gear to 3 or something. The 5 speed transmission is also not that smooth as I had wished. But otherwise its a good car and handles very well. Replies to this message: ptd1 (Jun 18, 2008 1:02 pm) wwest (Jun 19, 2008 8:39 am) mark4490 (Apr 26, 2009 10:23 am) and 1 more...

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