Dereileak

Wander

Unknown and unknowable. Until you find out what it can't hold.

Midnight Mystery

joeliu2003

spinedoc777

Does it help with the turbo lag at all? I would think it doesn't since it only affects 2k and up. Anytime the vehicle goes under 2k and throttle is applied it just sits there for 1-2 seconds not doing anything.

OK-RDX

That's not turbo lag you're experiencing, it's the numb response of today's throttle by wire. It takes a moment for pedal signal to be processed by the ECU before making a decision on trans gear selection, etc. I've noticed all newer cars respond similar due to how they're programmed, primarily in the name of economy over performance.

MI-RDX

^^^ This. My last 3 vehicles had the same 'throttle' delay and the RDX is the only turbo.

zroger73

Have you ever watched an electrically-controlled throttle blade respond to accelerator pedal position? They are mechanically and electronically capable of responding as fast, if not faster, than a human can depress the pedal to the floor, so there's no virtually no hard limit. However, the rate at which the throttle blade opens and closes can be limited by software. When the throttle blade opens slowly, drivers perceive this is as hesitation or turbo-lag. Limiting the rate of throttle opening is done primarily to protect the transmission by reducing driveline shock. When the throttle blade closes slowly, drivers perceive this as "rev hang". Limiting the rate of throttle closing is done primary to limit a spike in emissions that can occur when the throttle snaps closed at higher engine speeds.

The ETC operates when the ignition is on even when the engine isn't running. To get an idea of how fast it is capable of responding, turn the vehicle on and all accessories off in a quiet garage then rapidly press and release the accelerator pedal. You can hear the throttle actuator respond almost instantly to the position of the accelerator pedal.

spinedoc777

Your response is very timely. I just had my RDX in to get the heated steering wheel retrofitted and I had this conversation with the service manager and he said exactly what you said, makes a lot of sense. I've personally never experienced something so bad in any of my modern vehicles so was curious, it's actually somewhat dangerous in situations such as slowing down for a yield but then needing to quickly enter a road. My prior G80 did not do this at all, or it was so slight I never noticed, so I just assumed it was because it was a 6cyl non turbo, but I suppose the programming was different on it.

Anyhow I'm forcing myself to like this car!! On the way home from the dealer I put it is Sport + mode and really put it through its paces. I don't really like how the rpm's stay high when cruising, I would have hoped the vehicle would know better when I wanted power and when I wanted to cruise, but using the paddle shifters to shift up helps to make Sport + mode much more bearable. Before Sport + mode wanted me to be in 6th gear and around 4k+ rpm when doing 80 on the highway and not accelerating, but with the paddle shifters I can shift it up to a much more reasonable 8th gear.

joeliu2003

spinedoc777

Yes that's exactly what happens, I have counted out to myself a solid 1-2 seconds (which is a long time when trying to merge into NJ traffic!!) where it does absolutely nothing, then it jerks forward, most likely because I'm overcompensating at that point.

More to the point of this thread, can this hesitation be tuned out? I understand it will put more stress on the transmission, but that may be an acceptable trade off. I don't feel as if the RDX needs more power, it's already somewhat of a beast with Sport + mode, it just needs that hesitation to be reduced or eliminated.

Wander

Don't forget you can always temporarily over-ride gear selection with the paddle shifters.

If you are in "Drive", just yank the left paddle to downshift sequentially, as many gears as desired. You can upshift manually with the right paddle as necessary, or if you chill for a bit at steady speed, it will resume normal automatic operation.

If you are in "S" mode on the transmission, once you yank a paddle it will stay in "manual sequential" mode until you toggle the transmission to "D" or another setting.

Also, in "S" automatic mode, the controller will keep the engine speed higher for better responsiveness ( at the expense of noise and fuel economy ). This is independent of the "dynamic mode" setting, although its behavior may be altered by the dynamic mode. ( Interesting question... )

Also, if you are experiencing problems with responsiveness, I assume you have tried running the recommended fuel. This is likely to be especially important if you are running an aggressive tune.

SH4RKT00TH

https://www.caranddriver.com/news/a2...m-rahal-semaa/

"The Honda-focused speed shop reworked the RDX ... by putting in a new turbo, intake and exhaust manifolds, and downpipe. PRL Motorsports adds a custom-fabricated intercooler and intake to the mix. GRP's custom lightweight cat-back exhaust and ECU mapping from KTuning round off the package to help boost output to an estimated 345 horsepower and 370 lb-ft, increases of 73 horses and 90 lb-ft of twist over the stock car."

No mention of replacing 10AT!

YMMV.

joeliu2003

Midnight Mystery

This is the only face I can make at that statement...

Dereileak

RDX10

Midnight Mystery

Tranny cooler?

MrHeeltoe

iTrader: (1)

Why is it people are always so dead set that "the tranny is gunna blow?" Does Acura have that bad of a rep with transmissions? Because aside from some isolated models and situations I don't really see the concern.

Duna

So, I have one question. IS IT WORTH GETTING IT?

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joeliu2003

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Only you can decide that. I still enjoy the improvement ya on a daily basis, but it’s somewhat subjective. I still stand by my original observations as far as performance gains.

catalytic_ca

Our Odyssey has a similar issue with the 3.5 V6 too but none of the other cars we have had in the family have shown this tendency except for our two Honda/Acura products.