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Old 02-02-2009, 01:45 PM   #1
pignoseSTI
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Default Power cutting out at autox?

So today was my first autox with my new rotated turbo setup. Everything was going great except at certain points of the course the power would suddently cut out. It was like I hit a brick wall and the car just said no more. It was always in the upper rpms 6k+ in 2nd gear. It was quite bumpy where the power would cut out. Would that have anything to do with it? I know when it's bumpy and the car gets light the abs dies and the brakes don't work. I wouldn't think it would be a fueling issue as I had a half tank of gas. The weird thing is i shifted to 3rd in one of the bumpy sections and the power didn't cut out. And on the way home I checked the car and it ran perfect up to my 7500 rpm rev limit in 2nd gear. Anyone ever experience anything like this?
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Old 02-02-2009, 02:07 PM   #2
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Mine cuts real bad all through the RPM range on my first run. After that, it never does it again for the entire day. I'm thinking spiders and goblins for me, or maybe the leaded fuel is truely causing deposits that get cleared after the first run...I dunno.
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Old 02-02-2009, 02:27 PM   #3
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I've been in STI's at the track that have fuel cut from starvation with 1/2 tank of gas, so it's definitely possible that's what happened.
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Old 02-02-2009, 02:39 PM   #4
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If it was mainly doing it in a sharp, sustained right hand corner, it sounds like fuel starving.

My RS wants over 1/2 tank to keep from starving.
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Old 02-02-2009, 02:45 PM   #5
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It's probably fuel starvation.

-Duncan
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Old 02-02-2009, 02:57 PM   #6
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yep, I've had fuel cut at 3/8 tank
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Old 02-02-2009, 03:21 PM   #7
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I agree with them, sounds like fuel startvation. I freaked me out the first time it happened to me. By the way, what rotated kit did you go with, I have p&l's gt3071 on order, it was a tough decision between that and the 3076, but p&l says they developed th 3071 for autoX. I can't wait for spring
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Old 02-02-2009, 03:55 PM   #8
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i don't think it's fuel starvation as it was in straights when it happened. I've run it numerous times with a half to a quarter tank with no issues before.
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Old 02-02-2009, 03:56 PM   #9
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I have a pieced together (basically a modified Perrin) kit with a gt3076 .63 hotside turbo. Was great when it was working hahah
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Old 02-02-2009, 03:59 PM   #10
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If it's not fuel starvation....it's something worse. Try to log what's happening when it drops power. Look for high knock counts, misfires or anything odd.....

My money is on fuel starvation.....it's nothing new.

Jay
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Old 02-02-2009, 03:59 PM   #11
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Quote:
Originally Posted by pignoseSTI View Post
i don't think it's fuel starvation as it was in straights when it happened. I've run it numerous times with a half to a quarter tank with no issues before.
When a friend of mine started actually pushing his '06 WRX harder, and with stickier tires, suddenly, he found out that the 1/4 tank that used to be "no problem" would suddenly begin cutting out on him. I've had fuel starve at 1/2 tank in an '06 WRX, when the car was "straight," but I'd just come out of a turn. If the course was as bumpy as you say, it could exacerbate any fuel slosh.

Otherwise, maybe there's a loose wiring connection somewhere? :dunno:
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Old 02-02-2009, 04:30 PM   #12
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It's pretty common to happen coming out of a corner. Both times I saw it at VIR was just as we got onto the main straight, which is right after a long sustained corner.
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Old 02-02-2009, 04:42 PM   #13
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i'll post up some video shortly. You can kinda just hear the motor backing off, no rev limiter pop pop pop or anything and you can kinda see how bumpy it is. i really don't think it's fuel starvation as i have run on these particular tires for 7 events and was pushing the car less than usual (1st event of the season and i'm a bit rusty). Max lat g yesterday was 1.33, whereas i've hit 1.55 max before and sustained 1.21 (295/35/17 hoosier a6's)
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Old 02-02-2009, 05:33 PM   #14
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http://www.youtube.com/watch?v=_saDtTEJUDY . In this one you can hear it cut out at the end of the slalom at the beginning of the run, then after the right after the slalom during the "straight".

http://www.youtube.com/watch?v=ldrMcQN4L5g . This one during that "straight" I shifted to 3rd, and didn't have the power cut out.

Turn the sound all the way up, my camera microphone sucks

And no after the slalom I didn't let off the gas (it kinda sounds like it) I wanted to keep going a bit longer

Last edited by pignoseSTI; 02-02-2009 at 05:42 PM.
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Old 02-02-2009, 07:15 PM   #15
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Throttle lag from the fly by wire?
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Old 02-02-2009, 07:23 PM   #16
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Hmm I don't think so as I was accelerating and then a sudden loss of power. It's almost like i'm overboosting and hitting fuel cut but according to my defi gauge i'm hitting target boost. No cel and flashing cruise or anything like that
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Old 02-02-2009, 07:37 PM   #17
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I know what it is with 99% certainty.

If you can log throttle pedal position do it.

If you can't then make sure that the stopper is under the throttle pedal, or if you removed your carpet that you install a new stopper. Your TPS is going "beyond" 100% and cutting as a safety measure.
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Old 02-02-2009, 07:39 PM   #18
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What tune is on the car????? that might be the issue here...
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Old 02-02-2009, 07:46 PM   #19
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Just go out on the street and floor it (really to the floor) in 2nd gear and see what happens. Watch the boost gauge. If it overboosts and hits cut, that's one thing but my guess is that it just hits target and cuts ignition leading to my post #17
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Old 02-02-2009, 07:54 PM   #20
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Unfortunately I can't log as I have an accessport v1. Tune on it is from GST Motorsports(been going to Mike for years) Everything runs fine on the street, but it gave out at the autox. After the event I floored (all the way to the floor) it in 2nd on the way home and it pulled all the way to my 7500rpm rev limit. Hit target boost as well according to my Defi gauge. Had in between 1/4-1/2 tank of gas(according to my fuel gauge). Wish it did that at the autox lol. I assume my throttle stop is there as I haven't touched my carpet or anything by the pedal, but i'll go look. Thanks for everyone's help!
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Old 02-02-2009, 09:05 PM   #21
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quick question: Did you change the fuel pump when you made your most recent mods? And if so, did you use the "fuel intake bag" that came with the new pump, or the stock bag?

I changed the fuel pump out on my '04 STi before making some mods and getting a tune. I used the bag that came with the pump. The car would wash out of fuel at anything less than 1/2 tank. the car would literally turn off instantly, and I would have to cycle the key to get it restarted on course. Before the pump change, I could practically run the car empty. I changed back to the stock bag, on the aftermarket pump, and everything was fine again.

Just a thought.

Chris H.
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Old 02-02-2009, 10:25 PM   #22
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Thanks for the suggestion Chris, but I did a fuel pump install a while ago and I reused the stock bag for the reason that you mentioned.

btw the throttle stop is still there. The issue doesn't arise on the street, which is making it quite difficult to diagnose. I would chalk it up to a phantom miss or something but it happened on all runs for all three drivers during 2 different run groups.
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Old 02-03-2009, 09:13 AM   #23
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I couldn't really tell where it was cutting out in the videos - sorry. But it did appear that you're descriptions were of times coming off of hard right-handers and puching the gas for a straight. That's where my fuel starvation issues hit me, with anything less than 2/3rds of a tank. What tires are you using? If you're only using street tires, then fuel starve is very likely not the cause at least. I know I never had these problems until I started pulling >1.3G right turns.
-N
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Old 02-03-2009, 09:22 AM   #24
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Quote:
What tires are you using?
He's on big tires according to previous post: 295/35/17 hoosier a6's
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Old 02-03-2009, 09:26 AM   #25
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Sorry, missed that. In that case, hitting over 1.3Gs, I'd expect fuel cuts if you've got so little fuel.
-N
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