Maybe I just never noticed this before..
09-04-2009, 03:27 PM
#1
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Join Date: Jun 2008
Location: San Jose, CA
Posts: 1,808
Car Info: 2015 WRX
Maybe I just never noticed this before..
Sorry for the noob question, but my engine seems to be doing something new, or at least it's gotten more noticeable.
Let's say I'm driving in 5th gear at around 2750 RPM. If I press down on the gas to accelerate (let's say I depress the pedal completely), at about 3000 RPM the engine sort of .. "hiccups" once and starts to feel more sluggish, and then at about 3500-3750 RPM it kicks back in with another hiccup and there's a surge in engine power.
I'm pretty sure the second hiccup is the turbo engaging, but it's the first one that concerns me. Thoughts?
Let's say I'm driving in 5th gear at around 2750 RPM. If I press down on the gas to accelerate (let's say I depress the pedal completely), at about 3000 RPM the engine sort of .. "hiccups" once and starts to feel more sluggish, and then at about 3500-3750 RPM it kicks back in with another hiccup and there's a surge in engine power.
I'm pretty sure the second hiccup is the turbo engaging, but it's the first one that concerns me. Thoughts?
09-04-2009, 03:39 PM
#5
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Location: Sunnyvale, CA
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May be similar to a problem I had. The cause was never found, but the symptoms went away with a tune. I can ride along with you sometime after the weekend if you want.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
Last edited by VRT MBasile; 09-04-2009 at 03:58 PM.
09-04-2009, 04:03 PM
#8
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Location: Palo Alto, CA
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May be similar to a problem I had. The cause was never found, but the symptoms went away with a tune. I can ride along with you sometime after the weekend if you want.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
09-04-2009, 04:56 PM
#11
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Thread Starter
Join Date: Jun 2008
Location: San Jose, CA
Posts: 1,808
Car Info: 2015 WRX
May be similar to a problem I had. The cause was never found, but the symptoms went away with a tune. I can ride along with you sometime after the weekend if you want.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
What my problem was when I'd accelerate more than 50% throttle the RPM's would increase by about 500, then kind of pause, and then increase another 500, pause, and so on to about 5k RPM.
Dealership said it was the transmission "protecting itself" from the then stock engine. Modded the car and tuned it and the problem went away. I ran untuned for about a week after swapping from the automatic tranny to the manual, and the symptoms were back.
Anyways, if you want me to ride along to see if is the same issue, get my number from Danielle. I'll also see if I can get my AP cable working with my laptop again so we can do some logging and see if any values are off.
09-04-2009, 11:17 PM
#12
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Join Date: Aug 2008
Location: Manhattan, NY
Posts: 623
Car Info: The 4 Train
My Audi did that twice (yes, I realize not the same car but might give you ideas of places to start)
First time: Vacuum hoses were leaking.
Second time: Needed new O2 sensor.
..... I think.... that car had so many problems it is sometimes hard for me to remember what fixed each problem.
Also, I never noticed it when driving your car before (granted I always tried to behave myself when driving your car so I didn't ever really push it hard
), but I don't remember it doing that when you were driving either.
First time: Vacuum hoses were leaking.
Second time: Needed new O2 sensor.
..... I think.... that car had so many problems it is sometimes hard for me to remember what fixed each problem.
Also, I never noticed it when driving your car before (granted I always tried to behave myself when driving your car so I didn't ever really push it hard
), but I don't remember it doing that when you were driving either.
Last edited by danielliez; 09-04-2009 at 11:29 PM.
09-04-2009, 11:26 PM
#14
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Join Date: Aug 2008
Location: Manhattan, NY
Posts: 623
Car Info: The 4 Train
09-04-2009, 11:27 PM
#15
I think you should get a tune. i'd guess its fuel system related, unless something is going to bite the dust on your car. If you take it to someone like ED @eq tuning, he'd probably be the best to diagnose or notice any abnormality, rather than just tune your car and not try to find out whats going on. He's really good at that stuff.
Last edited by slow04wrx; 09-04-2009 at 11:30 PM.