[Saenz90]

Lately I had been noticing sometimes when I floor it the car feels sluggish compared to other times. For instance even flooring it back to back from same RPM, one time the car picks up quick and hard, the next time it picks up noticeable slower and then again will pick up quick and hard after that. All within a few seconds of each other, same RPM, same conditions. I don't believe this could be caused by intercooler heat soak because it is not consistently getting worse the harder I drive the car. When I started paying attention to the boost gauge it confirmed what I was feeling. The times it felt slower it was only running 12 PSI or so at an RPM it normally should be at 17 or 18. I also noticed sometimes it would jump all over the place and I would feel the car noticeably gain/lose power accordingly, while other times it would hold pressure smoothly. I attached a very short video demonstrating the what I am talking about. I was in Sport+ the entire time and any time I start to accelerate my foot is flat on the floor. I know it looks like I'm giving partial throttle since boost pressure jumps around but Im floored. Also as you can see this was filmed at 70 degrees so not particularly hot weather to give the car a reason to pull boost pressure. I am running 93 fuel and this has been an ongoing issue over multiple tanks. I have a hard time believing the car should be so inconsistent with the boost levels and power by design, but I feel like if i take it to the dealer they are going to shrug it off and say it seems fine. The car runs perfectly other than this. Note in the video the first few runs how differently boost builds compared to the last one.
Has anyone else noticed their car behaving in a similar way?
Thanks.

 

[Uz718]

Lately I had been noticing sometimes when I floor it the car feels sluggish compared to other times. For instance even flooring it back to back from same RPM, one time the car picks up quick and hard, the next time it picks up noticeable slower and then again will pick up quick and hard after that. All within a few seconds of each other, same RPM, same conditions. I don't believe this could be caused by intercooler heat soak because it is not consistently getting worse the harder I drive the car. When I started paying attention to the boost gauge it confirmed what I was feeling. The times it felt slower it was only running 12 PSI or so at an RPM it normally should be at 17 or 18. I also noticed sometimes it would jump all over the place and I would feel the car noticeably gain/lose power accordingly, while other times it would hold pressure smoothly. I attached a very short video demonstrating the what I am talking about. I was in Sport+ the entire time and any time I start to accelerate my foot is flat on the floor. I know it looks like I'm giving partial throttle since boost pressure jumps around but Im floored. Also as you can see this was filmed at 70 degrees so not particularly hot weather to give the car a reason to pull boost pressure. I am running 93 fuel and this has been an ongoing issue over multiple tanks. I have a hard time believing the car should be so inconsistent with the boost levels and power by design, but I feel like if i take it to the dealer they are going to shrug it off and say it seems fine. The car runs perfectly other than this. Note in the video the first few runs how differently boost builds compared to the last one.
Has anyone else noticed their car behaving in a similar way?
Thanks.

I have the exact same problem in mine too...

 

[Nithros]

I guess I was expecting some red line pulls - is it not broken in yet? Sounds almost related to what post 1 in this thread is saying...

https://www.718forum.com/forum/porsche-718-cayman-gts/16358-new-gts-boost-pressure.html#post142640

 

[Saenz90]

I guess I was expecting some red line pulls - is it not broken in yet? Sounds almost related to what post 1 in this thread is saying...

https://www.718forum.com/forum/porsche-718-cayman-gts/16358-new-gts-boost-pressure.html#post142640

Car is broken in and I regularly take it to redline. Currently have about 9k miles. Also I know it is normal for boost to taper off as you get closer to 7.5k RPM. Just did high load, low rpm pulls in the video because it is easier to see the what I am talking about that way. The way boost builds and how much is given at certain RPM's as I accelerate is all over the place.

 

[Zydi]

I can’t see the issue in your video, sorry. I watched it twice and all I could see was a steady increase of the RPM’s between 3000 and 4000. Whatever the turbo boost tells you in the gauges I think the information is not precise or lags.

My recommendation would be to stop the time it takes to accelerate between 3k and 4k rpm. do it several times so you get a reference value.

 

[Michael1]

I wonder if the engine pulls down boost if it detects knock. You might want to try a different brand or higher octane gas.


Does it doe this at other RPMs?


Also is yours an S or base?

 

[Saenz90]

I have tried shell and exon gas, always put 93 octane (US). Car is a base Cayman. I agree though it does seem like knock prevention or similar. I think when I take it for the 10k service I will mention this or maybe even ask to drive another base boxster/Cayman and see if it does the same thing.

 

[ZuffenHouseRules]

It looks like boost is building in a linear fashion then dropping off linear (apart from where you back off WOT around 4k rpm). Appears normal to me.

Don't expect to necessarily see max. boost for more than a moment (at low revs in low gear with WOT) as the engine incurs highest loads while 'pulling out of the hole'. Even then indicated psi may be below factory-stated max. This has been my experience with 2.5/VTG as discussed in earlier thread.

With this new turbo technology I think DME calls up just enough boost to meet its programmed power curve based on load, internal temps, ambient air pressure...the whole complex interaction of everything for which the ECU has sensors or actuators (which in 9A2 turbos is more than ever before). That level of boost could be momentarily factory max. (as reported by some) but could also be less-than-max (as reported by others).

Hey folks let's get some more data based on your observations added to this thread https://www.718forum.com/forum/engine-technical-discussion/15990-2-5-boost-levels-observed.html

I'd only be concerned if the engine does not *feel* like it's pulling strong, hard and linear.

 

[Groleau905]

Lately I had been noticing sometimes when I floor it the car feels sluggish compared to other times. For instance even flooring it back to back from same RPM, one time the car picks up quick and hard, the next time it picks up noticeable slower and then again will pick up quick and hard after that. All within a few seconds of each other, same RPM, same conditions. I don't believe this could be caused by intercooler heat soak because it is not consistently getting worse the harder I drive the car. When I started paying attention to the boost gauge it confirmed what I was feeling. The times it felt slower it was only running 12 PSI or so at an RPM it normally should be at 17 or 18. I also noticed sometimes it would jump all over the place and I would feel the car noticeably gain/lose power accordingly, while other times it would hold pressure smoothly. I attached a very short video demonstrating the what I am talking about. I was in Sport+ the entire time and any time I start to accelerate my foot is flat on the floor. I know it looks like I'm giving partial throttle since boost pressure jumps around but Im floored. Also as you can see this was filmed at 70 degrees so not particularly hot weather to give the car a reason to pull boost pressure. I am running 93 fuel and this has been an ongoing issue over multiple tanks. I have a hard time believing the car should be so inconsistent with the boost levels and power by design, but I feel like if i take it to the dealer they are going to shrug it off and say it seems fine. The car runs perfectly other than this. Note in the video the first few runs how differently boost builds compared to the last one.
Has anyone else noticed their car behaving in a similar way?
Thanks.

 

[Groleau905]

did find something about it a have a macan gts and have the same problem the performance and boost is never regular….

 

[pps718gtscayman]

Lately I had been noticing sometimes when I floor it the car feels sluggish compared to other times. For instance even flooring it back to back from same RPM, one time the car picks up quick and hard, the next time it picks up noticeable slower and then again will pick up quick and hard after that. All within a few seconds of each other, same RPM, same conditions. I don't believe this could be caused by intercooler heat soak because it is not consistently getting worse the harder I drive the car. When I started paying attention to the boost gauge it confirmed what I was feeling. The times it felt slower it was only running 12 PSI or so at an RPM it normally should be at 17 or 18. I also noticed sometimes it would jump all over the place and I would feel the car noticeably gain/lose power accordingly, while other times it would hold pressure smoothly. I attached a very short video demonstrating the what I am talking about. I was in Sport+ the entire time and any time I start to accelerate my foot is flat on the floor. I know it looks like I'm giving partial throttle since boost pressure jumps around but Im floored. Also as you can see this was filmed at 70 degrees so not particularly hot weather to give the car a reason to pull boost pressure. I am running 93 fuel and this has been an ongoing issue over multiple tanks. I have a hard time believing the car should be so inconsistent with the boost levels and power by design, but I feel like if i take it to the dealer they are going to shrug it off and say it seems fine. The car runs perfectly other than this. Note in the video the first few runs how differently boost builds compared to the last one.
Has anyone else noticed their car behaving in a similar way?
Thanks.

You need new plugs