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Old 01-21-2013, 11:08 PM   #1
emazz104
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Default RPM Spike After Cobb Map

I have a Stage 2 2004 WRX. I recently got an AccessPort and flashed the Cobb Stage 2 map. Since then I get a RPM spike during shifts. It occurs most commonly around 3k RPMs and the RPMs jump around 500. I'm NOT pressing the clutch while I'm on still on the gas, I thought that at first, but I can fully pull my foot off the gas and hitch the clutch and it will still happen.

It only happens when I'm on the gas (not necessarily WOT, but even 50%.)
I read all the threads I could find about others having the same issues, but what doesn't make sense to me is that it only started happening after the Cobb map. I had the car for months before running the previous map, and it didn't happen then.

I contacted Cobb and they said that the previous tune could have been hiding a mechanical issue, any ideas on where to start?
The previous tune was done with an Accessport, and when I installed mine it said the tune would be completely erased. I read that if I uninstall the Accessport it will reinstall the previous tune. Anybody know if that's the case? Then I could confirm that it doesn't happen on that tune, and isn't something that happened to pop up at the same I flashed the new map.

Thank you!

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Last edited by emazz104; 01-21-2013 at 11:40 PM.
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Old 01-21-2013, 11:17 PM   #2
wrx1392
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mine does that when it is hot in the summer time after a lot of stop and go driving ...the idle goes way up ,and when shifting through the gears it does what yours does. im sure my proplem is a way to get more coolant to pass through the motor so as not to damage it ...but it does bug i have the old Cobb stage 2 reflash
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Old 01-21-2013, 11:28 PM   #3
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Originally Posted by wrx1392 View Post
mine does that when it is hot in the summer time after a lot of stop and go driving ...the idle goes way up ,and when shifting through the gears it does what yours does. im sure my proplem is a way to get more coolant to pass through the motor so as not to damage it ...but it does bug i have the old Cobb stage 2 reflash
Yeah, it seems normal, it's just really annoying haha.
Plus I want to know why it only started after the Cobb map.
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Old 01-22-2013, 09:22 AM   #4
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Originally Posted by emazz104 View Post
I have a Stage 2 2004 WRX. I recently got an AccessPort and flashed the Cobb Stage 2 map. Since then I get a RPM spike during shifts. It occurs most commonly around 3k RPMs and the RPMs jump around 500. I'm NOT pressing the clutch while I'm on still on the gas, I thought that at first, but I can fully pull my foot off the gas and hitch the clutch and it will still happen.

It only happens when I'm on the gas (not necessarily WOT, but even 50%.)
I read all the threads I could find about others having the same issues, but what doesn't make sense to me is that it only started happening after the Cobb map. I had the car for months before running the previous map, and it didn't happen then.

I contacted Cobb and they said that the previous tune could have been hiding a mechanical issue, any ideas on where to start?
The previous tune was done with an Accessport, and when I installed mine it said the tune would be completely erased. I read that if I uninstall the Accessport it will reinstall the previous tune. Anybody know if that's the case? Then I could confirm that it doesn't happen on that tune, and isn't something that happened to pop up at the same I flashed the new map.

Thank you!

*EDIT: Thanks for the move.
There are some learned functions to idle control which could possibly impact lift-throttle shift behavior, but this is not something that I've heard a complaint before for the drive-by-cable cars (i.e. 02-05 WRX). Since all learned functions are cleared when you install the AccessPORT or reflash a map, I would give it about a week of driving and see if it improves.

If not, it may be increased boost levels at different throttle position (even less than WOT) in our map relative to the old map that may be what you are not used to. Give it a little time and you will adjust your shifting (without even noticing it probably).

If there was a previous AccessPORT tune on the ECU when you installed the current AccessPORT, that old tune will be erased. This is a special case to allow users who have lost their AccessPORT (or buy a used car but did not get the AccessPORT) to install another easily on top of it and revert back to stock when they uninstall.

Bill
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Old 01-22-2013, 09:32 AM   #5
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I'm fairly certain this is pretty common. Literally everyone I personally know with a WRX or STI says the same thing, myself included.
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Old 01-22-2013, 11:36 AM   #6
Cobb Tuning
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Originally Posted by zashoe View Post
I'm fairly certain this is pretty common. Literally everyone I personally know with a WRX or STI says the same thing, myself included.
Throttle "hang" can definitely be a problem with the drive-by-wire cars (especially later models where the OEM tune deliberately makes this worse), but this can be mitigated by manipulating specific idle airflow tables (that can influence throttle opening on lift throttle). Drive-by-cable cars (02-05 WRX), on the other hand, throttle "hang" is not usually a problem that I've heard of. But, maybe I just haven't come across it being mentioned before.

Bill
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Old 01-22-2013, 08:43 PM   #7
emazz104
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Quote:
Originally Posted by Cobb Tuning View Post
There are some learned functions to idle control which could possibly impact lift-throttle shift behavior, but this is not something that I've heard a complaint before for the drive-by-cable cars (i.e. 02-05 WRX). Since all learned functions are cleared when you install the AccessPORT or reflash a map, I would give it about a week of driving and see if it improves.

If not, it may be increased boost levels at different throttle position (even less than WOT) in our map relative to the old map that may be what you are not used to. Give it a little time and you will adjust your shifting (without even noticing it probably).

If there was a previous AccessPORT tune on the ECU when you installed the current AccessPORT, that old tune will be erased. This is a special case to allow users who have lost their AccessPORT (or buy a used car but did not get the AccessPORT) to install another easily on top of it and revert back to stock when they uninstall.

Bill
I flashed the map almost a month ago. I can avoid it happening if I try, but it's just kind of annoying.
I don't know what the previous tune was, and I didn't run it long enough to learn it very well, but the tune definitely feels different now. So that would make sense if it was say a Stage 1 tune before...
Quote:
Originally Posted by zashoe View Post
I'm fairly certain this is pretty common. Literally everyone I personally know with a WRX or STI says the same thing, myself included.
Yeah, I know, that's what I have read it just never happened before the new tune, that's what I'm trying to figure out.
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Old 01-23-2013, 08:38 AM   #8
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Originally Posted by emazz104 View Post
I flashed the map almost a month ago. I can avoid it happening if I try, but it's just kind of annoying.
I don't know what the previous tune was, and I didn't run it long enough to learn it very well, but the tune definitely feels different now. So that would make sense if it was say a Stage 1 tune before...

Yeah, I know, that's what I have read it just never happened before the new tune, that's what I'm trying to figure out.
Do you have a version 2 AccessPORT? If so, get a data log as outlined in the video below (or when the RPM jump is happening). That way, we can make sure your boost levels look good and there isn't anything else going on.


Bill
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Old 01-23-2013, 08:43 AM   #9
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To me, what you are describing is clutch slip. Which would make sense, being an 04, with probably some miles on it, increasing torque output, and it slips right at peak torque.

You're having the problem on acceleration, without the clutch depressed, correct?
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Old 01-23-2013, 08:45 AM   #10
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Quote:
Originally Posted by Cobb Tuning View Post
Throttle "hang" can definitely be a problem with the drive-by-wire cars (especially later models where the OEM tune deliberately makes this worse), but this can be mitigated by manipulating specific idle airflow tables (that can influence throttle opening on lift throttle). Drive-by-cable cars (02-05 WRX), on the other hand, throttle "hang" is not usually a problem that I've heard of. But, maybe I just haven't come across it being mentioned before.

Bill
Are these tables in the throttle mapping (i.e. accelerator pedal to requested torque, requested torque to throttle opening), or seperate idle airflow tables?
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Old 01-23-2013, 08:52 AM   #11
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Originally Posted by BlazeRex View Post
Are these tables in the throttle mapping (i.e. accelerator pedal to requested torque, requested torque to throttle opening), or seperate idle airflow tables?
For drive-by-wire cars, they are separate idle airflow tables.

Bill
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Old 01-23-2013, 03:13 PM   #12
emazz104
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Originally Posted by Cobb Tuning View Post
Do you have a version 2 AccessPORT? If so, get a data log as outlined in the video below (or when the RPM jump is happening). That way, we can make sure your boost levels look good and there isn't anything else going on.

http://www.youtube.com/watch?v=rjEGZ-4dsDYz

Bill
Yeah, I have some old logs but I'll go and grab a few right now and have them up tonight, thanks!
Quote:
Originally Posted by BlazeRex View Post
To me, what you are describing is clutch slip. Which would make sense, being an 04, with probably some miles on it, increasing torque output, and it slips right at peak torque.

You're having the problem on acceleration, without the clutch depressed, correct?
It's not the clutch slipping.
I have no problem accelerating without the clutch depressed, the clutch was just replaced a few thousand miles ago.
It's once I take my foot off the gas and hit the clutch that the RPMs spike.
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Old 01-23-2013, 09:40 PM   #13
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Quote:
Originally Posted by wrx1392 View Post
mine does that when it is hot in the summer time after a lot of stop and go driving ...the idle goes way up ,and when shifting through the gears it does what yours does. im sure my proplem is a way to get more coolant to pass through the motor so as not to damage it ...but it does bug i have the old Cobb stage 2 reflash
I had this very problem. It was fixed by turning the cruise control cable a few turns, giving it some slack. Turns out the plastic it's encased in expands in high temperatures, causing an already taut cruise control cable (which is attached to your throttle plate) to gradually flex and put tension on the cable, thus causing the slow rise in rpm.

Since the fix, I haven't seen the rpm idle raise again with no other changes in these regards. My driving is during traffic hours, tons of stop and go..
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Old 01-24-2013, 07:16 AM   #14
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Originally Posted by emjp4 View Post

I had this very problem. It was fixed by turning the cruise control cable a few turns, giving it some slack. Turns out the plastic it's encased in expands in high temperatures, causing an already taut cruise control cable (which is attached to your throttle plate) to gradually flex and put tension on the cable, thus causing the slow rise in rpm.

Since the fix, I haven't seen the rpm idle raise again with no other changes in these regards. My driving is during traffic hours, tons of stop and go..
That would make perfect sense. I'll take a look tonight, thank you.
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Old 01-25-2013, 03:04 AM   #15
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Quote:
Originally Posted by BlazeRex View Post
To me, what you are describing is clutch slip. Which would make sense, being an 04, with probably some miles on it, increasing torque output, and it slips right at peak torque.

You're having the problem on acceleration, without the clutch depressed, correct?
Bingo , I second this guy ^^^
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Old 01-25-2013, 07:29 AM   #16
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Originally Posted by Andrewxxcarlson View Post

Bingo , I second this guy ^^^
Thanks, but its not that. Bill said there is a fueling issue and to look into that first anyways.
Quote:
Originally Posted by emazz104 View Post
It's not the clutch slipping.
I have no problem accelerating without the clutch depressed, the clutch was just replaced a few thousand miles ago.
It's once I take my foot off the gas and hit the clutch that the RPMs spike.
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Old 02-13-2013, 10:45 AM   #17
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Im haven the same issue ill be crusing along at 65 in 5th and downshift to pass a car fast and the rpms jump when i step on it. Dosent even have to be wot. I thought it was a ****ty tune
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Old 02-14-2013, 12:06 PM   #18
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Im haven the same issue ill be crusing along at 65 in 5th and downshift to pass a car fast and the rpms jump when i step on it. Dosent even have to be wot. I thought it was a ****ty tune
That's completely different haha.
That sounds more like a clutch, how many miles are on it?
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Old 02-15-2013, 11:53 AM   #19
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Shes got 33k on her, been at stage 2 sense 6500


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That's completely different haha.
That sounds more like a clutch, how many miles are on it?
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Old 02-22-2013, 04:40 PM   #20
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mine does the same thing in my 04 wrx.. i had a custom stage 2 tune made for my accessport by precision tuning in NJ, and it worked fine. the accessport somehow erased the custom tune from itself without me telling it to, and its not showing up in my "list of maps" or "map currently being used"
ANYWAYS,
i ended up going to the stage 2 OTS map from cobbs website, and it has been revving itself up after every shift. its defintely NOT a clutch issue. i have tried multiple ways of shifting, and it revvs every time. I tried releasing the gas all of the way, and then pressing in the clutch.. it still revvs.

it never seemed to do this until i switched to the OTS map. i will go and check the cruise cable like someone mentioned above

also, i am running the v1 accessport
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Old 02-22-2013, 08:26 PM   #21
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Originally Posted by staticchmbr View Post
mine does the same thing in my 04 wrx.. i had a custom stage 2 tune made for my accessport by precision tuning in NJ, and it worked fine. the accessport somehow erased the custom tune from itself without me telling it to, and its not showing up in my "list of maps" or "map currently being used"
ANYWAYS,
i ended up going to the stage 2 OTS map from cobbs website, and it has been revving itself up after every shift. its defintely NOT a clutch issue. i have tried multiple ways of shifting, and it revvs every time. I tried releasing the gas all of the way, and then pressing in the clutch.. it still revvs.

it never seemed to do this until i switched to the OTS map. i will go and check the cruise cable like someone mentioned above

also, i am running the v1 accessport
Yeah, that's the same for me.
I have recently been having knocking and misfire issues that I never had before. Not sure if its related or not, but the revving has been happening for a while.
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Old 02-25-2013, 11:15 AM   #22
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Let me know how ya make out, if i figure it out first ill post for everybody.
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Old 02-25-2013, 06:01 PM   #23
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Let me know how ya make out, if i figure it out first ill post for everybody.
Will do, I have a bunch if other weird things happening now so I think it's related to something else. I'll let you know either way.
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Old 03-28-2013, 07:42 PM   #24
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Anything new on this issue? I have the same issue and stumbled onto your thread while searching. I have a hybrid motor with a decent amount of work. When I stop at a light my rpm will slowly increase from 1000 to almost 3000 and just hang there until I tap the gas and it goes back to normal. It's really frustrating.
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Old 03-28-2013, 07:51 PM   #25
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Anything new on this issue? I have the same issue and stumbled onto your thread while searching. I have a hybrid motor with a decent amount of work. When I stop at a light my rpm will slowly increase from 1000 to almost 3000 and just hang there until I tap the gas and it goes back to normal. It's really frustrating.
That's a different issue, but to answer your question I don't have any updates. It's still doing it.
I've hardly driven it since I last posted since I've been working on some new things for it for spring.
So I'm in the same boat as before.
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