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Old 07-01-2007, 06:17 PM   #1
boostdog
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Default 5k rpm studder on my 07 tr...please help

ok guys/gals i have an issue with my new tr... it seems that when the weather changes and gets a little cooler...ex: it was 90 during the day and in the 70's that night... when i floor the car in 2nd gear at 5k rpms it feels like i have hit fuel cut. feels like you hit a brick wall... the car is completely stock besides a k&n panel filter. it has done this 3 times..the car is 4 weeks old as well. is there a fix for this ? such as an updated ecu flash from the dealer that i am needing? please let me know.

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Old 07-02-2007, 10:28 AM   #2
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bump for answers
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Old 07-02-2007, 11:02 AM   #3
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How many miles are on it?
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Old 07-02-2007, 02:35 PM   #4
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Originally Posted by boostdog View Post
ok guys/gals i have an issue with my new tr... it seems that when the weather changes and gets a little cooler...ex: it was 90 during the day and in the 70's that night... when i floor the car in 2nd gear at 5k rpms it feels like i have hit fuel cut. feels like you hit a brick wall... the car is completely stock besides a k&n panel filter. it has done this 3 times..the car is 4 weeks old as well. is there a fix for this ? such as an updated ecu flash from the dealer that i am needing? please let me know.

Sounds like fuel cut. Get "tunned," or don't floor it in 5th.
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Old 07-02-2007, 05:55 PM   #5
boostdog
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it has 2039 miles on it... get it tuned, don't floor it??? wow theres a ton of help... tuned ..how? dealer? floor it.... i didn't buy this thing to drive like you grandmother....
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Old 07-02-2007, 06:06 PM   #6
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well i called the dealer and the mechanic recommended taking the k&n filter out and replacing it with the stocker. they have no ecu flashes or tsb's for this car at all currently. so i'll give it a few days and see how it reacts to the stock filter.
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Old 07-02-2007, 06:32 PM   #7
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If what actually happened was that you hit the fuel cut, there is not going to be any fixes, other then what I suggested. I find it hard to believe that this is what happened, as the stock boost and WGDC mapping isn't very aggressive.

However, you described the fuel cut exactly in your first post, and unless the dealer is willing to raise your fuel cut value (which requires an EM tool, that I'm not sure they even have), your only fixes are exactly what I suggested.

Maybe you're just feeling boost drop off as you're getting into the high RPM band.
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Old 07-02-2007, 11:04 PM   #8
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Did you break in the car properly?
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Old 07-02-2007, 11:52 PM   #9
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What's the deal with all of these 07 having this same type of issue? I would take it back to the dealer and register a complaint or an investigation started.
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Old 07-03-2007, 09:47 AM   #10
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Yes I broke the car in properly... I am going to see if it happens with the stock filter...if it does do it again i'll take it to the dealer and have them take a look at it...it's not boost dropping off... i thought that was it when it 1st happened until it happened a few times. it is way to violent to be boost dropping off. it felt just like my dsm would do when it hit fuel cut.

06grayrex what issues are you seeing with the 07's?

Thanks for the help wage0052.
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Old 07-03-2007, 01:08 PM   #11
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Originally Posted by wage0052 View Post
Sounds like fuel cut. Get "tunned," or don't floor it in 5th.
This is a totally newb question, but should I not be flooring it in 5th in a totally stock car for fear of this? Is it really that bad? I read the whole thread on boost creep, and realize that it occurs regularly when people do accelerate hard in top gear, but I thought that only happened with TBE and other modified setups potentially running higher levels of boost. I didn't realize it was a no-no on a stock WRX as well.
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Old 07-03-2007, 04:15 PM   #12
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i never had no problems with my 07 then again after the first 1000 oil change i went stage 1.
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Old 07-03-2007, 05:08 PM   #13
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This is a totally newb question, but should I not be flooring it in 5th in a totally stock car for fear of this? Is it really that bad? I read the whole thread on boost creep, and realize that it occurs regularly when people do accelerate hard in top gear, but I thought that only happened with TBE and other modified setups potentially running higher levels of boost. I didn't realize it was a no-no on a stock WRX as well.
No, flooring it in 5th on the highway is fine. The only time anyone is going to hit fuel cut is if the car is tuned and has very high values WGDC values in the low rpm cells, and/or bad boost mapping. This is fairly common with many of the "free" OSecu stage 1 and 2 maps.

Before this thread, I had never heard of this happening on the stock map.

Also, despite what you've heard, boost creep should not be an issue with the 2.5L and the TD04, if it's properly tuned.
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Old 07-03-2007, 05:13 PM   #14
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i have teh same thing on my 02 as does any subaru. Get on the gas gradually and you wont have that problem. Also, you would actually benefit more by shifting into 3rd instead of 2nd at 5k when you get on it, because the little td04 doesnt do too well up high in the revs.
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Old 07-03-2007, 06:19 PM   #15
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I thought the 07 were all having these problems....until dealer flashes came out
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Old 07-03-2007, 11:42 PM   #16
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Yes I broke the car in properly... I am going to see if it happens with the stock filter...if it does do it again i'll take it to the dealer and have them take a look at it...it's not boost dropping off... i thought that was it when it 1st happened until it happened a few times. it is way to violent to be boost dropping off. it felt just like my dsm would do when it hit fuel cut.

06grayrex what issues are you seeing with the 07's?

Thanks for the help wage0052.
I have been seeing a lot of threads where people with 07 wrx/sti are having problems with either loss of power above 5k rpms or just throttle response issues. I don't know if it intake related or something with the electronic throttle.
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Old 07-05-2007, 08:56 AM   #17
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bought my 07 end of january...never had a problem. My car only has 1300 miles, but I broke it in properly. Before you ask, I dont drive it very often, but Ive been deployed since March. My wife told me it still drives fine
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Old 07-05-2007, 09:12 AM   #18
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Originally Posted by Gorge View Post
Did you break in the car properly?
That has absolutely nothing to do with anything.



Also, "properly" is a matter of opinion. Time has shown that beating the bag out of it from day 1, or babying it for 1k miles doesnt have any kind of affect on the longevity of the motor. In fact, most pro builders of race motors will break a motor in for all of about an hour.
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Old 07-05-2007, 09:13 AM   #19
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Originally Posted by RL-N-AH View Post
i never had no problems
So what you are saying is you always had problems?



To answer the question of "should I not be able to floor it in 5th on a stock car"
Yes, you absolutely should be able to floor it in 5th.




This is exactly the reason that you should never, EVER own a turbo car without a boost gauge. Is it overboosting? Most likely. How much? Where? Only 5th? Probably not, which means 100% certainty that you are having detonation in other gears when floored.

What I am saying is that you need to find out if it is dfinately overboosting. Obviously it definately sounds like it is. But if it is in 5th, you can bet it is in the other gears, just not far enough to hit cut. This is an extremely bad situation for your motor, because with stock engine management, more boost than normal is going to cause detonation, and detonation is bad (ranges from kinda bad to REALLY bad) Just going out and getting a tune is a bad idea, because you are tuning the EM to compensate for some other problem.

Last edited by Davenow; 07-05-2007 at 09:19 AM.
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Old 07-05-2007, 09:33 AM   #20
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I installed my boost guage a few days ago and it is spiking to about 11.5-12 psi and pulling about 15 of vacumm, which i believe is correct, correct me if i am wrong ...so far with the stock filter i have not had an issue with the studder.
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Old 07-05-2007, 12:44 PM   #21
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Spiking is different then hitting target boost. Target boost is like 11.5. With a boost gauge, you'll see spiking right after you go WOT. Just watch the gauge, and if it jumps over 11.5, and then goes down to settle on 11.5, you're overboosting. This often happens in 5th gear, but I'm unsure as to how often on the stock map, as I didn't log it much before I flashed my stage 1.
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Old 07-05-2007, 03:01 PM   #22
boostdog
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i have not tested to see what psi it hits in 5th but i know that it spikes somewhere right at 11.5-12 psi in 2nd gear which is where i have been having trouble with the studder @ 5k rpms. I have not had it happen since installing the guage and putting the oem filter back in..time will tell.
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Old 07-05-2007, 10:25 PM   #23
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well i just had the same problem two days ago in my completely stock 06. I was having a spirited drive up a mountain pass chasing a liberty - awesome fun i was smiling all day from it. Anwyay maybe two or three times i was holding second - flooring it at about 5k and it felt like a fuel cut too. Was too busy driving to see if the cruise light was flashing. Not sure what to do - if its not causing any damage it doesnt really bother me. I know the dealer will be useless
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Old 07-06-2007, 12:55 AM   #24
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Originally Posted by 06grayrex View Post
I have been seeing a lot of threads where people with 07 wrx/sti are having problems with either loss of power above 5k rpms or just throttle response issues. I don't know if it intake related or something with the electronic throttle.
Please get the story straight as misinformation benefits no one.

MY07 STI has hesitation problems, between 3k - 4k rpm, stemming from the initial ECU flash and re-flash provided by SOA. There are plenty of threads on it but it does not involve the WRX TR that OP is inquiring about.
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Old 07-06-2007, 01:14 AM   #25
06grayrex
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Originally Posted by SurfPine View Post
Please get the story straight as misinformation benefits no one.

MY07 STI has hesitation problems, between 3k - 4k rpm, stemming from the initial ECU flash and re-flash provided by SOA. There are plenty of threads on it but it does not involve the WRX TR that OP is inquiring about.
Oh I'm sorry I guess I have not been seeing any threads about the 07's having hesitation problems for which sometimes the reflash from the dealer corrects it and sometimes it doesn't.. A lot of those posts the OP mentions something about the problem starting after the intake was installed, or the electronic TB is having problems. Also if you look at the qoute that you quoted me on I said "I DON"T KNOW IF" , so I didn't say that I knew that was the problem. I was making a general statement that the 07's are having a lot of problems and I was asking WHY that is....I'm sorry for asking a question! So oh my god (SURFPINE) will you forgive me?????? So maybe someone should get the question straight....
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