Slow throttle dropoff when upshifting

binto100

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

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Stillen G3 intake, CBE, 19 row oil cooler and power steering oil cooler. VentureShield bumper, full hood.