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Thread: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

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    Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Hi guys, I just picked up a base 2014 981 back in August and have about 1500 miles on it. It is a manual transmission and am definitely experiencing the same issue as Gator4.

    Base Boxster hesitates starting from a dead stop

    However, the issue I'm about to describe may be a separate problem (hence the separate post).

    I have a rather short commute to/from work in a lot of stop and go traffic. I notice that if I'm driving casually and shifting at around 3000 RPMs, I notice the oh-so-slightest bucking at around 1500-2500 RPMs in 3rd and 4th gear. At first I thought that maybe it was the minor bumps in the road but I realize I feel this all the time. Now that I notice it, it bugs the **** out of me.

    It happens with Sport Mode ON and OFF.

    I actually brought it to my dealer and had a service tech take a spin with me. I was unable to reproduce Gator4's issue but the tech said he did notice this slight bucking. He brought it in for about a half hour and said he couldn't find anything.

    So if any 981 owners want to try this out, I'd be curious to see if you notice it. Drive casually while slowly accelerating...shifting gears at around 3000 RPMs...keeping the slightest pressure on the gas pedal, check to see if you feel the slightest hesitation / bucking as you pass thorough the 1500-2500 RPM range in 3rd and in 4th gear. Tell me I'm not crazy :-)

    Thanks guys


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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by Jamoke View Post
    Hi guys, I just picked up a base 2014 981 back in August and have about 1500 miles on it. It is a manual transmission and am definitely experiencing the same issue as Gator4.

    Base Boxster hesitates starting from a dead stop

    However, the issue I'm about to describe may be a separate problem (hence the separate post).

    I have a rather short commute to/from work in a lot of stop and go traffic. I notice that if I'm driving casually and shifting at around 3000 RPMs, I notice the oh-so-slightest bucking at around 1500-2500 RPMs in 3rd and 4th gear. At first I thought that maybe it was the minor bumps in the road but I realize I feel this all the time. Now that I notice it, it bugs the **** out of me.

    It happens with Sport Mode ON and OFF.

    I actually brought it to my dealer and had a service tech take a spin with me. I was unable to reproduce Gator4's issue but the tech said he did notice this slight bucking. He brought it in for about a half hour and said he couldn't find anything.

    So if any 981 owners want to try this out, I'd be curious to see if you notice it. Drive casually while slowly accelerating...shifting gears at around 3000 RPMs...keeping the slightest pressure on the gas pedal, check to see if you feel the slightest hesitation / bucking as you pass thorough the 1500-2500 RPM range in 3rd and in 4th gear. Tell me I'm not crazy :-)

    Thanks guys
    I have a 14 base with MT.... I have not noticed what you are describing. It is my daily driver and I have 5000 miles on it so far...if it was there, I should have noticed it. It might just be you car.....keep us posted.

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Is it possible that you're mistaking hesitation for spool time? When I'm slowly pulling away from a light my car will go into 2nd gear almost immediately, then if I give it some gas it feels like it slightly hesitates from 1200 to 2000rpm, but to me that seems to be normal behavior and just the car progressively spooling the revs up... It spools slow and then gets much faster after 2500rpm.

    That's how my car does it and it seems like normal behavior to me. Almost every car I've driven is like that. Low revs equals low power equals slow spool-up, right?
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I have not seen a dyno output for the base car.

    But the S has a dip in torque from 3200 revs to 3800 revs.

    Maybe the base has one at the revs you are describing.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I'm confused...you said to test this out by driving casually shifting at 3000 RPM and then see if we notice any bucking around 1500-2000 RPM's in 3rd and 4th...? Are you saying in only happens in the upper gears at low revs? I have a 14 base with MT and I've never experienced this. But then I again, I usually shift around 3000+ RPM. This engine is not torquee, it lugs below 2k IMO, keep the revs up. I'll give it a go today though and see what happens.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    You really need a turbo Diesel engine if you want to drive smoothly at those revs in a high gear. My GT3 wouldn't run without hunting under those conditions.

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by Elms View Post
    I'm confused...you said to test this out by driving casually shifting at 3000 RPM and then see if we notice any bucking around 1500-2000 RPM's in 3rd and 4th...? Are you saying in only happens in the upper gears at low revs? I have a 14 base with MT and I've never experienced this. But then I again, I usually shift around 3000+ RPM. This engine is not torquee, it lugs below 2k IMO, keep the revs up. I'll give it a go today though and see what happens.
    Sorry Elms..let me clarify. Yes it is noticeable to me in 3rd or 4th gear at the low revs. In fact, you don' really need to shift. In 3rd gear, drive slow but steady at around 2k rpms...or in 4th gear, drive slow and steady at around 2.5k rpms. I guess it's the engine just lugging

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I gave this a go yesterday and felt no hesitation in 3rd or 4th when shifting a little below 2k. The time I did feel some hesitation in 3rd was because I had the AC on full blast. Once I turned it back to normal I felt no hesitation.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I've gotta guess its "lugging". I never let my revs fall below 2000 rpms without downshifting. Anything below that and I get the same thing you're describing as I suspect most would. Passing through 1500-2500 rpms in 3rd or 4th gear screams you're in too high a gear for those rpms to me.
    Last edited by Budman; 09-25-2013 at 09:46 AM.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by Budman View Post
    I've gotta guess its "lugging". I never let my revs fall below 2000 rpms without downshifting. Anything below that and I get the same thing you're describing as I suspect most would. Passing through 1500-2500 rpms in 3rd or 4th gear screams you're in too high a gear for those rpms to me.
    I don't know what 1500 rpms feel like in 4th...now 6000-7500 rpms on the other hand, I know what that feels like

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I've got a "stumble" at 2000-2200 RPM in my base Cayman. Not sure if it's engine or PDK related, though.

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by Direwolf View Post
    I've got a "stumble" at 2000-2200 RPM in my base Cayman. Not sure if it's engine or PDK related, though.
    I have the base with a manual and never noticed that in 1,100 miles. It seems to perform perfectly.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by LouCipo View Post
    I have the base with a manual and never noticed that in 1,100 miles. It seems to perform perfectly.
    My 2013 MT base has 17,000 miles and while I don't accelerate below 2,000 rpm, I have never experienced any bucking or hesitation when punching the throttle at 2k revs in 3rd or 4th.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    How do I put this? I may or may NOT have road tested 2 981s, both base cars, one a 2013 and one a 2014 with brand new 3.8 engines. You guys aren't imagining this. I have felt this also, but I haven't been lurking around here because we have been flat out trying to get caught up but in finishing 2 of the conversions, I was ready to write this off to the fact that the 2.7L car does not have an intake flapper in the manifold. I was convinced that what we had done to the car was causing this. If either of you want to talk more, send me an email possibly.

    I'm curious as to what you find and what the dealer says. This had been keeping me up at nights and I was waking up convinced that it was cam timing related. This is what happens when I don't come on here! Ken warned me!
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by BGB Motorsports View Post
    How do I put this? I may or may NOT have road tested 2 981s, both base cars, one a 2013 and one a 2014 with brand new 3.8 engines. You guys aren't imagining this. I have felt this also, but I haven't been lurking around here because we have been flat out trying to get caught up but in finishing 2 of the conversions, I was ready to write this off to the fact that the 2.7L car does not have an intake flapper in the manifold. I was convinced that what we had done to the car was causing this. If either of you want to talk more, send me an email possibly.

    I'm curious as to what you find and what the dealer says. This had been keeping me up at nights and I was waking up convinced that it was cam timing related. This is what happens when I don't come on here! Ken warned me!
    Ok I'll bite. You did not road test two base 981s 2013 and 2014 with new 3.8 engines cause there a'int no such animal.

    What are you trying to say here?

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    Quote Originally Posted by BJR View Post
    Ok I'll bite. You did not road test two base 981s 2013 and 2014 with new 3.8 engines cause there a'int no such animal.

    What are you trying to say here?

    It's just more data supporting the fact that I'm more confident now that whatever the problem is, it's related to the car's DME/ECU. As soon as I figure out what it is, I'll let you guys know. I'm just saying that we were ready to write-off the hesitation on the "big car" due to it's having been swapped. I'm relieved to know that there might be a dip in the file, all of which can be fixed.
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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    BGB, thanks for the reply. Interesting engine swap :-)

    Please keep me updated as to what you find. I'm just glad some other people are experiencing the same issue as me.

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I have a 2014 981S MT with 3K kms and did notice what you are describing since day 1, however it is nearly unnoticeable with "Sport+" on.
    I have a feeling that this has something to do with VarioCam.

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    I'm chiming in again on this one. We have a 7speed manual 991 C2S and given that we have experienced the same problem with our converted 3.8L 981, I have been paying attention; the 3.8L 991 C2S has the same hesitation, but in a much less noticeable fashion. It's there, but nearly noticeable.

    I have been noodling around with the idea of installing a 981 IPD plenum on the 2.7L customer car we have, to see if this sorts it out. I am wondering if it's a question of air flow and how the air enters the resonance chamber after passing through the throttle body.

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    Re: Base Cayman slightly hesitates / bucks at 1500-2500 RPMs...try it

    My 2013 Boxster S with 700 miles is doing the same, didn't pay attention to Sport mode yet. I figured after break in I should not have this problem. I noticed if you blip the throttle in neutral, rpm jumps to about 2500 very quickly and seems to stop there. Maybe the car is designed to change behavior around 2500 rpm. I am not toi concern on this.

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