Slow throttle dropoff when upshifting
 

Hi All.

I have 700 miles on my car and have started installing the Stillen G3 intake, CBE, oil cooler, steering fluid cooler. I can't wait to get all this behind me and get over the break-in period so I can finally open the car up a bit.

I have a throttle question I thought I'd post here for feedback b/f going to the dealer.

When I lift my foot from the throttle to upshift it sometimes takes up to a second for the rpm's to start dropping; I've never run into this on any car before. Often times the rpm's will actually momentarily and slightly increase after I've lifted my foot from the throttle and pushed in the clutch. Firstly it's rather irritating and secondly it makes for slow shifts (I'm not trying to speed shift).

My understanding is that the Z has an electronic throttle. Is it possible or likely that the throttle needs to be re-calibrated or some other adjustment is necessary?

I'm curious if this throttle phenomenon is typical for the Z or if the car needs dealer attention. I’m 54 and have driven sticks off and on since day but I’ve never experienced this before.

Thanks.

Bruce

As I understand it, the throttle float is programmed in for emissions purposes. I guess it's slightly less polluting if the motor hangs there for a second rather than drop/regain rpm. Some brands/models have it worse than others, but most newer cars have at least some throttle float. I guess a competent tuner can adjust it out, but I don't know for sure.

^^ yah, emissions. burn fuel completely seems like.

I could be totally wrong, but I thought this was partially due to momentum of the dual mass fly wheel? Please correct me if I am.

You're not wrong. It's a combination of the rotating mass of the flywheel, the lag in the electronic throttle, and emissions controls.

Could it be due to SRM turned on?

If there is a malfunction with the SRM system, but this really is a very common issue due to the reasons I listed in my post above. If you are accelerating quickly you actually see a rise in the RPMs after you let off the throttle simply due to the mass of the flywheel.

^^ m4a1mustang is right.

It also happens when the SRM is turned off BTW.

My car does it as well. I've had to adjust my driving style to accommodate it, but it still catches me off guard sometimes.

Thanks for all the feedback, at least I know I'm no losing my mind.

Bruce

My 2007 Civic Si did the same thing. In fact, there was the exact same thread on the Civic forum with people complaining, and others replying that it was an emissions control feature. :icon17: