Sticking Throttle - HELP

WarmAndSCSI · 07-14-2011, 10:09 AM

The Evo X does the same thing. It's primarily for emissions purposes - the intent is to leave the throttle open a bit and leave ignition timing advanced to burn off excess fuel after the engine has been burning a rich mixture (free-revving would cause this, same with after a WOT pull). Some theorize it has more to do with keeping the catalytic converter(s) healthy. I really have no idea... I don't spend much time thinking about improving emissions when I tune cars. lol

It's annoying, but I know it's normal on the Evo X, and probably the same on the Z.

elmz · 07-14-2011, 11:50 AM

I've always thought this was by design; that the revs do that after you depress the clutch for 2 reasons. It was like this in the 350 as well. It allows for smoother shifts. By holding or slightly increasing the revs before it begins to drop, it gives you more lee way to meet the revs when you pop in the next gear and left off the clutch. Secondly, have you ever driven a car, say in 1st gear and rev'd it up to like 5000 rmp's then let off the throttle? It jerks and shudders! And to avoid that, you would normally have to depress the clutch before letting off the throttle. But not in the Z, it is very smooth. Just let off the throttle and watch the revs go up and hold for a second to keep the car from jerking.

07-14-2011, 10:09 AM	#1 (permalink)
WarmAndSCSI A True Z Fanatic Join Date: May 2010 Location: SLC, UT Posts: 1,671 Drives: '08 Evo X \| '10 370Z Rep Power: 19	The Evo X does the same thing. It's primarily for emissions purposes - the intent is to leave the throttle open a bit and leave ignition timing advanced to burn off excess fuel after the engine has been burning a rich mixture (free-revving would cause this, same with after a WOT pull). Some theorize it has more to do with keeping the catalytic converter(s) healthy. I really have no idea... I don't spend much time thinking about improving emissions when I tune cars. lol It's annoying, but I know it's normal on the Evo X, and probably the same on the Z. __________________ '10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake '08 Evo X - built motor+trans \| BB-X @ 32 psi \| CH3OH \| self-built+tuned - ??? WHP '01 Galant V6 - built motor \| GT35R \| self-built+tuned - 550+ WHP (retired) Last edited by WarmAndSCSI; 07-14-2011 at 10:12 AM.

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07-14-2011, 11:50 AM	#2 (permalink)
elmz Track Member Join Date: Feb 2009 Location: San Diego, CA Posts: 674 Drives: 2014 Porsche Boxster Rep Power: 19	I've always thought this was by design; that the revs do that after you depress the clutch for 2 reasons. It was like this in the 350 as well. It allows for smoother shifts. By holding or slightly increasing the revs before it begins to drop, it gives you more lee way to meet the revs when you pop in the next gear and left off the clutch. Secondly, have you ever driven a car, say in 1st gear and rev'd it up to like 5000 rmp's then let off the throttle? It jerks and shudders! And to avoid that, you would normally have to depress the clutch before letting off the throttle. But not in the Z, it is very smooth. Just let off the throttle and watch the revs go up and hold for a second to keep the car from jerking.