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SUVs Acura RDX Acura RDX
2722 messages, Last post on Sep 25, 2009 at 12:58 PM
You are in the Acura RDX Forum. Your Hosts are steve_ & tidester
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Replying to: bodble2 (Jun 16, 2008 11:41 am) Wastegate failure due to poor design would be my guess. |
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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.
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Replying to: mfeirman (Jun 17, 2008 6:24 am) I like the vehice though.
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Replying to: mfeirman (Jun 17, 2008 6:24 am) 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. |
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Replying to: ptd1 (Jun 17, 2008 6:45 am) 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. |
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Replying to: wwest (May 31, 2008 9:21 am) The 5 speed transmission is also not that smooth as I had wished. But otherwise its a good car and handles very well.
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Replying to: suvsearcher1 (Jun 18, 2008 7:42 am) If I come over a rise in the highway and just tap the brake to release the cruise, it downshifts... and other times too (approaching a curve when I decell... very annoying... bad for fuel economy, and can't do much for the life of the trans either. Acura has no tweak at this time.
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I just recently bought a 2007 RDX but was not able to aford it with Navigation, does anyone know if i could purchase the navigation for it and have them install it in the near future?
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Replying to: edr10 (Jun 18, 2008 3:21 pm) |
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Replying to: ptd1 (Jun 18, 2008 1:02 pm) But... Touch the brakes, even ever so lightly... And you have not only just "told" the engine/transaxle ECU that you wish to slow to a lower speed, you have also "told" the ECU that in your "view" the roadbed traction is high enough for braking, primarily FRONT braking. So if the "grade logic" indicates that just before brake application the vehicle was gaining more speed than would indicate a level roadbed the engine/transaxle ECU will command a downshift when you "touch" the brakes. Try using the e-brake as a temporary trial to avoid the downshifts. I am continually puzzled as to why so many dealers think reseting the ECU would result in a long term fix for these problems, it CANNOT. Keep in mind, with FWD or F/AWD it can be HAZARDOUS to downshift the transaxle BLINDLY, absent knowing the roadbed conditions insofar as traction is concerned. ABS can and will RELEASE excessive braking HP at the front wheels if the roadbed conditions are no conducive to same, but in the short term, milliseconds, it cannot CANCEL engine compression braking. "(approaching a curve when I decel..." I hope, like to think, you meant to say "approaching a downhill curve, or approaching a curve directly from a downhill slope.." If the RDX transaxle downshifts on a "level" curve as you describe then the grade logic is flawed. The default transaxle "action" in a FWD or F/AWD with throttle lift, even the slightest lift, is to upshift IMMEDIATELY. Downshifting, or even remaining in a lower gear ratio just previously being used for acceleration, can easily result in loss of control should the roadbed traction be questionable. Toyota & Lexus are currently encountering HUGE problems surrounding this very issue. Back late in the last century in order to put a relatively large V6 engine and ROBUST transaxle in tandem SIDEWAYS in the upcoming RX300 they eliminated a few transaxle components they THOUGHT to be not important. Wrong..!!
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