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Old 04-18-2010, 05:59 PM   #1
1-3-2-4
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Default First overboost, then underboost...need input with maps and wastegate adjustment

Hey all,

I'm in a situation where I can use a bit of guidance as this is uncharted territory for me. My 05 STi was running a Cobb OTS Stage 1 93 octane map. From day one, I felt the boost was a bit high in gears 3-6. I'd normally hit around 17 psi in first and second, but the higher the gear/load, the higher boost would go. I've seen 18-19 repeatedly. A quick call to Cobb told me that this is acceptable given the load compensation at work. Ok, fine. I'll live with it.

Fast forward to this AM. Car's warmed up and I'm climbing a hill. I go to pass a slow moving minivan in fourth gear and hit fuel cut...CEL and all. Oh, did I mention I was going to get gas? Light just came on. Not knowing if this mistake my my ham-fisted idiocy or the tune, I loaded the LWG map. No fuel cut and gears 3-6 hit target boost (and then some in the higher gears). However, first and second gear under boosts. As in, 13.8 psi in first and 14.5 psi in second.

So naturally, my questions:

1. Was the fuel cut a result of climbing a hill in a high(er) gear? Did the low fuel level momentarily starve the fuel pump?
2. Should the wastegate arm be adjusted to compensate?
3. If so, which map would you recommend sticking with?

Trying to find a happy balance here, despite the VF39 having a tendency to spike. Never had this problem on my old TD04 WRX stage 2, so your input is welcome!
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Old 04-18-2010, 06:43 PM   #2
arghx7
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Old 04-18-2010, 06:44 PM   #3
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It's either a tuning issue or a wastegate flow issue, or both. If your wastegate can't flow enough, you need more wastegate flow or more restriction in the exhaust. No amount of tuning can fix a mechanical limitation. If it's tuning, well the wastegate duty cycle tables are the first place to check, but there are also air temperature compensation tables to adjust. This can all be changed in accesstuner race.
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Old 04-18-2010, 06:59 PM   #4
1-3-2-4
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Understood.

I bought the car used, so there is no telling what the previous owner did. I have a pretty good suspicion the car was at stage two, so the wastegate may have been physically adjusted one way or another. The blessings of buying a used car...

As far as restrictions in the exhaust, I'm still running the stock turboback. It doesn't get much more restrictive. I know porting the wastegate is an alternative, but not one I'm willing to pursue...yet.

As far as adjusting the tables, this sounds like the best way to roll except for the fact that I don't have the tuner software. This would have to be a protune. Which in and of itself is fine, except it would be a waste of funds to get an otherwise stock car protuned IMO.
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Old 04-18-2010, 11:13 PM   #5
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why not get the software? it's free
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Old 04-19-2010, 07:48 AM   #6
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Quote:
Originally Posted by freetors View Post
why not get the software? it's free
Which software are you referring to?
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Old 04-19-2010, 01:26 PM   #7
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accessTuner race.
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Old 04-19-2010, 02:12 PM   #8
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Well, I just called Cobb over lunch and explained my situation. Based on THIS conversation, it looks like my first call in to Cobb yielded inaccurate information. Basically, I'm told that 14-15 psi in gears 1-2 is normal and that I will NOT see target boost in the lower gears. As long as I'm hitting target boost in gears 3-6, all is well. Of course, this goes without saying that this is the safer approach. Looks like I'll live with it as is...
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Old 05-04-2010, 08:50 PM   #9
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If you are running OTS Cobb maps with the correct hardware (cat-back, TBE...) your car should not "cutout" during acceleration before you redline. The previous owner COULD have adjusted something manually, but not likely... I had similar issues and had to get a "protune" to be sure all the parameters were correct on my stage 1 map. Am I happy with what I have now? YES. Was I hoping to "plug n play" my accessport stage 1 as advertised? YES. If you dont want to get a "protune" and dont want the CEL to come on I would recommend staying light on the throttle

http://forums.nasioc.com/forums/show....php?t=1982882
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Old 05-04-2010, 09:05 PM   #10
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Bwilliams,

My guess is you had a mechanical issue that was able to be tuned around. The TD04 does not typically boost creep.

Our current maps for the VF-based cars, especially the new GR and GB chassis, have been revised with less aggressive boost control. As 1-3-2-4 stated, you will not hit peak boost in every gear, especially in 1st and 2nd.

Travis
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Old 05-04-2010, 11:45 PM   #11
1-3-2-4
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Quote:
Originally Posted by Cobb Tuning View Post
Bwilliams,

My guess is you had a mechanical issue that was able to be tuned around. The TD04 does not typically boost creep.

Our current maps for the VF-based cars, especially the new GR and GB chassis, have been revised with less aggressive boost control. As 1-3-2-4 stated, you will not hit peak boost in every gear, especially in 1st and 2nd.

Travis
COBB Tuning
Thanks for confirming, again. I must admit though, I do miss 17 psi in first and second gears! That was a dangerous taste of power for me...
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Old 05-05-2010, 10:22 AM   #12
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I would say you overboosted past what the settings are set for in the map. It's not going to kill the car but, it's a pain.

Download AccessTuner Race and you can adjust that by changing the Boost Limits and the Boost Solenoid Limits to a little higher and "tada" no more check engine light. You also may try porting the wastegate some to promote the flow of it.
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Old 05-05-2010, 01:58 PM   #13
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Go get a protuneit iwll wake your car up like youve never felt before.
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Old 05-05-2010, 02:50 PM   #14
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A protune is a waste of money for me at this point (the car is stock). After I start amassing parts, a proper tune will be performed.

Unfortunately, I can't download the Race Tuner software. Only for v2, and I'm still on v1.
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Old 05-20-2010, 05:33 PM   #15
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If you're interested, I've got Street Tuner with a Hasp key for the accessport V1. I was running it until the AP died, and I had to get the V2. Software is collecting virtual dust right now, and it is basically the same program those guys are talking about.

I can't use the software anymore, so PM me if you're interested in being able to tune your own car with your AP V1. You'd be able to adjust everything, any map that a professional tuner has access to (primary ignition, boost target, wgdc, cam advance, maf calibration, turbo dynamics, etc...)
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Old 05-20-2010, 08:44 PM   #16
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Cool man, thanks. PM sent.
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