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Old 08-17-2010, 04:36 PM   #101
Daluv
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granularity might not be at best with a 4800 bauds protocol (SSM) for that kind of debugging stuff. Hence why I want to increase the baud rate in the ROM somehow someday if I can solve that annoying hesitation #$%@#$

from what I can see on my tool (4-5 query seconds including display), mine does not fluctuate with a constant light throttle..

Mart

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from my experience...even within the last couple weeks logging my neighbors 06 sti....you pretty much have to be at a constant throttle input....or coming down from say12% to 10% to be in CL.....if the throttle % is increasing it should kick you into OL pretty fast.

His car was going ol cl ol cl ol cl ol cl ol cl every second or two.....so if you're just glancing over at your ssm monitor you wouldnt really notice that
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Old 08-17-2010, 06:41 PM   #102
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Change your delay time to 250 for the OL/CL transition in all cells...That should help smooth it a bit if that is a concern. I seem to recall however you claim to have these issues with a stock tune so this may be a waste of discussion.

BTW-- If you delays are set to 0 many of the other ECU variables for OL/CL are ignored.
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Old 08-18-2010, 11:15 AM   #103
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kinda of a similar hesitation on same hardware but with the OEM stock tune in CL.

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Change your delay time to 250 for the OL/CL transition in all cells...That should help smooth it a bit if that is a concern. I seem to recall however you claim to have these issues with a stock tune so this may be a waste of discussion.

BTW-- If you delays are set to 0 many of the other ECU variables for OL/CL are ignored.
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Old 08-18-2010, 01:05 PM   #104
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Change your delay time to 250 for the OL/CL transition in all cells...
i would not do that......thats gonna cause him to stay in CL into peak boost.....
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Old 08-19-2010, 02:39 AM   #105
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A quick google search for "BPV Hesitation" gives several people claiming that putting a FORGE BPV cures their hesitation problems.... now is it true...
I wonder if the problem is post-throttle-body vacuum sucking in pre-throttle-body air, via a leaky BPV. I don't see how recirculation would make it run rough, but if air is intermittently taking a different path around the throttle plate, that certainly could. It would be similar to taking random stabs at the throttle.
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Old 08-19-2010, 08:32 AM   #106
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Mart, are you sure you're in closed loop? Your time delays are 0, so any pedal % should throw you into OL immediately.
That's not how it works. The final decision is always based on the primary fuel map -> if it calls for richer than a specific threshold (also tuneable - usually 14:1 or 14.4:1 depending on ECU) then it will switch to OL (assuming all other conditions are met). If your delays are set to zero, then the primary fuel map will be the only consideration.
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Old 08-19-2010, 12:02 PM   #107
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^ which will happen instantaneously no?

I'm just telling u what I saw staring at the cl/ol parameter in the logger for an hour straight. Any throttle input besides decreasing or constant put the car in ol. Pretty much any throttle input at most speeds will get u above loads with cells richer than that.
So its using the ol table too, but the change is perceived (by me at least) as instantaneous with any throttle input.
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Old 08-19-2010, 12:41 PM   #108
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or your DBW tables are agressive and any light pedal input translate into a big increment of the throttle opening (this translate into instant OL?)?

on my DBW tables, I can do 1% increment of pedal input and stay in CL....

Mart

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^ which will happen instantaneously no?

I'm just telling u what I saw staring at the cl/ol parameter in the logger for an hour straight. Any throttle input besides decreasing or constant put the car in ol. Pretty much any throttle input at most speeds will get u above loads with cells richer than that.
So its using the ol table too, but the change is perceived (by me at least) as instantaneous with any throttle input.
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Old 08-19-2010, 01:06 PM   #109
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My neighbor has stock 06 Sti throttle mapping.
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Old 08-19-2010, 03:48 PM   #110
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Quote:
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^ which will happen instantaneously no?

I'm just telling u what I saw staring at the cl/ol parameter in the logger for an hour straight. Any throttle input besides decreasing or constant put the car in ol. Pretty much any throttle input at most speeds will get u above loads with cells richer than that.
So its using the ol table too, but the change is perceived (by me at least) as instantaneous with any throttle input.
Well, it would depend on the map. Some of the OEM maps have stoich values up to ~1.4 g/rev at less than ~3200-3600 RPM. But, I see what you're saying. You can always tune the fuel map to change the behavior of the CL/OL transition with a delay of zero. The delay is really the time you have to continuously exceed the designated throttle or base pulse width thresholds (2d tables) before the potential switch to OL will occur (depending on the fuel map). It isn't a time delay when the decision to go OL is made. So, if you want the switch to be throttle based, you could set the delay to a non-zero value and tune the 2d throttle table appropriately, keeping in mind the delay is how long you need to continuosly exceed that threshold. That is why the OEM tune for the 04-05 WRX is so jacked - not because the delay value is high, but because it uses a single throttle and BPW threshold for all RPM.
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Old 08-24-2010, 10:10 AM   #111
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Forge BPV 100% recirc is in the mail... will report back soon...
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Old 08-25-2010, 11:12 PM   #112
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i have this exact same problem with my xt, stage 2 protuned. it does it worst when going up a hill from a stop. engine fully warmed up. im curious if its the bpv
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Old 08-30-2010, 08:37 PM   #113
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the forge BPV is a nice piece.

I just installed the Forge BPV, went for a ride and guess what? The hesitation is a little bit worse. Will I ever find it out?
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Old 08-30-2010, 08:50 PM   #114
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Make sure it is setup correctly. I recall there are shims or spacers. Try more or less shims, go to one extreme then to the other and narrow yourself in on the proper spring preload.
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Old 08-30-2010, 09:48 PM   #115
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I am running the yellow spring with the 2 shims at the moment. Peak boost is around 19PSI so I guess it is correct:

http://www.forgemotorsport.co.uk/con...roduct=FMDVTUN

the car does feel responsier and peppier....

Mart

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Make sure it is setup correctly. I recall there are shims or spacers. Try more or less shims, go to one extreme then to the other and narrow yourself in on the proper spring preload.
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Old 08-31-2010, 09:19 PM   #116
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have you checked fuel pressure. ive been searching and the fuel pressure regulator has been the issue in some of these hesitation issues. i will be checking mine
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Old 08-31-2010, 09:21 PM   #117
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yes check my 1st post. FPR is brand new...

Mart

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have you checked fuel pressure. ive been searching and the fuel pressure regulator has been the issue in some of these hesitation issues. i will be checking mine
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Old 08-31-2010, 10:04 PM   #118
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since the hesitation only occurs in vaccuum < -9.6PSI, I need to figure out where to look for leaks. Positive pressure test is one thing but it is not enough in my case. I need to find all the air path when the car is in vacuum.

Putting 10PSI in the system does not show any air leaks...
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Old 09-01-2010, 10:03 PM   #119
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I tried the yellow one with no shim, one shim, 2 shims, I tried the blue and they all hesitate. uhm running out of idea :/

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Make sure it is setup correctly. I recall there are shims or spacers. Try more or less shims, go to one extreme then to the other and narrow yourself in on the proper spring preload.
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Old 09-02-2010, 07:47 AM   #120
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im dropping my xt off at the mech today to run some tests. hopefully he can find the problem. watch it be something simple
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Old 09-02-2010, 08:32 AM   #121
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keep me posted

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im dropping my xt off at the mech today to run some tests. hopefully he can find the problem. watch it be something simple
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Old 09-02-2010, 06:37 PM   #122
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well, just got back. he said it was definately pulling fuel and then dumping fuel. it was obvious just by reving the car sitting still. he then checked what the front o2 sensor was doing, and it was going up and down, the rear o2 was showing fixed. i guess the tuner did that on the rear o2.but the verdict is replace the front o2 sensor.

he also checked for leaks and there were none. he was using a handheld diagnostic tool.
when he revved it the exhaust would pop afterwards leaning toward having a rich tune but when i was watching the monitor while getting tuned it showed 11.5 , this was at topspeed . so im hoping the o2 fixes this. does all this sound right?

i know you changed your o2 with no fix, im not sure what to think since it didnt help with your hesitation. ill let you know if it works for me.
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Old 09-02-2010, 07:53 PM   #123
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unplug the 02 sensor and go for a ride. Try to recreate hesitation. If it is still hesitating, it is not the front o2

Mart

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well, just got back. he said it was definately pulling fuel and then dumping fuel. it was obvious just by reving the car sitting still. he then checked what the front o2 sensor was doing, and it was going up and down, the rear o2 was showing fixed. i guess the tuner did that on the rear o2.but the verdict is replace the front o2 sensor.

he also checked for leaks and there were none. he was using a handheld diagnostic tool.
when he revved it the exhaust would pop afterwards leaning toward having a rich tune but when i was watching the monitor while getting tuned it showed 11.5 , this was at topspeed . so im hoping the o2 fixes this. does all this sound right?

i know you changed your o2 with no fix, im not sure what to think since it didnt help with your hesitation. ill let you know if it works for me.
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Old 09-02-2010, 10:08 PM   #124
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thanks . ill try that on my way to work tommorrow. so how will it run with it unplugged? doesnt it throw it in open loop? would it drive like if it had a good o2 or is it more to see if the hesitation is there. will the cel go off when i plug it back in? what should i expect when i unplug it?, hesitation gone=replace sensor and if it still hesitates=o2 sensor good

what im trying to ask is if the o2 sensor is bad and i unplug it will the car run awesome or just a lil better, but not as good as if i had a good sensor plugged in?

if this isnt the problem than im thinking fuel pump
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Old 09-03-2010, 11:30 AM   #125
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if this isnt the problem than im thinking fuel pump
I have been fighting the the same hesitation on my '04 STi for over three years now.

For me, changing the fuel pump didn't resolve the problem. I've gone through the same troubleshooting steps as the OP and nothing seems to make a difference. I'm starting to wonder if it's an ECU/wiring problem.

Just out of curiosity, approx. how many miles did everyone have on the car when they first noticed the hesitation?
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