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Old 09-28-2022, 10:56 PM   #1
Lancer020
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Default DAM inconsistant

Hey everyone. I have a 2020 STI with minor mods; Cobb downpipe, cat back exhaust, upgraded fuel pump and lines, upgraded radiator, Cold air intake, 1000cc injectors. I have an accessport. For awhile, my car was running fine. Lately though there have been strange readings. Especially in DAM numbers. It used to read 1.000, then it started dipping to 0.319, then it rose to 0.688, now it's reading 0.438. Feedback knock is at -2.80/0.00. Fine Knock Learn is at -4.90/1.54, only in boost. I'm a bit concerned, but it doesn't seem to running too poorly. This might be calm before the storm. I admit that I have constantly been running my car to a near empty tank. I do put 91 octane to fill it, but i haven't normally filled it all the way. I figured that putting the recommended fuel in the car would fix the problem. But it hasn't. I currently have a Cobb tune on the car. The car has been running fine with the tune. Now it's just throwing numbers and I'm not sure what is causing the problem, except that maybe running the car on a near empty tank with an upgraded fuel pump could cause the numbers to fly everywhere, but I'm not a mechanic nor a tuner.
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Old 09-29-2022, 08:36 AM   #2
rtv900
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Quote:
Originally Posted by Lancer020 View Post
I figured that putting the recommended fuel in the car would fix the problem. But it hasn't.
^this statement is bizarre
So you haven't been using the octane you need? That would be the first DAM issue because that is a knock safety. so yeah, use the right fuel.

running a tank close to empty means nothing contrary to internet myths you'll hear. Unless the pump actually runs dry it has no idea if there's a million gallons in the tank or a cup.

Why aren't you running 93? Is it not available where you live?
If you run the right fuel and it keeps happening you are simply running too aggressive a tune, so ease it up and you'll be fine.
Cars aren't magic, you can't just turn up boost and timing and think it magically makes more power and there are no side effects
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Old 09-29-2022, 01:14 PM   #3
Lancer020
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Quote:
Originally Posted by rtv900 View Post
^this statement is bizarre
So you haven't been using the octane you need? That would be the first DAM issue because that is a knock safety. so yeah, use the right fuel.

running a tank close to empty means nothing contrary to internet myths you'll hear. Unless the pump actually runs dry it has no idea if there's a million gallons in the tank or a cup.

Why aren't you running 93? Is it not available where you live?
If you run the right fuel and it keeps happening you are simply running too aggressive a tune, so ease it up and you'll be fine.
Cars aren't magic, you can't just turn up boost and timing and think it magically makes more power and there are no side effects
I live in Nevada and as far as I know there aren't any pumps that have 93+ octane, besides the Las Vegas racetrack. I've ALWAYS pumped 91 octane into my vehicle. Hm..so if you're saying that my tune is too aggressive, then maybe I should after all just go back to the stock tune. Obviously cars aren't magic, if they were, they would be brooms. My boost is around 18psi. So, I don't think it would blow the motor to shrapnel.
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Old 09-29-2022, 04:53 PM   #4
rtv900
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well what tune are you running?
A 91 octane for those mods?

And why did you upgrade injectors? 18 psi of boost would work fine on stock injectors, so if you are using a standard app tune it probably doesn't account for those huge injectors and they aren't working right and you are leaning out causing problems.

You can't go to a stock tune with those changes, most won't matter much but bigger injectors matter because the computer has to know how long to pulse them for a certain amount of fuel.
Changing the pump, pressure and injectors changes all kinds of variables.
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Old 09-29-2022, 07:21 PM   #5
K3rm1tth3fr0g
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Are you on a protune?
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Old 09-30-2022, 12:23 AM   #6
Lancer020
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Quote:
Originally Posted by rtv900 View Post
well what tune are you running?
A 91 octane for those mods?

And why did you upgrade injectors? 18 psi of boost would work fine on stock injectors, so if you are using a standard app tune it probably doesn't account for those huge injectors and they aren't working right and you are leaning out causing problems.

You can't go to a stock tune with those changes, most won't matter much but bigger injectors matter because the computer has to know how long to pulse them for a certain amount of fuel.
Changing the pump, pressure and injectors changes all kinds of variables.
I had the injectors upgraded because I felt that maybe the upgraded fuel pump and lines would pull more fuel and having stock injectors would hinder the flow of the fuel needed. I had this done because I was going to go E85, but Cobb had cut the cord on that before I had the time to finish it. So, I have an unfinished E85 setup and a stage 1 91 octane tune and a stage 2 91 octane tune on my accessport. At this point, it might be necessary to go to a proper tuner in town and figure out what can be done to make the numbers more stable and the car happy again.
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Old 09-30-2022, 12:24 AM   #7
Lancer020
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Are you on a protune?
No. Accessport.
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Old 09-30-2022, 08:23 AM   #8
rtv900
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Originally Posted by Lancer020 View Post
I have an unfinished E85 setup and a stage 1 91 octane tune and a stage 2 91 octane tune on my accessport.
ok, well the injectors make sense given the E85 thing, but if you are bailing on the E85 you aught to just switch them back.
This is why you are having problems, your tune isn't correct for your setup so the injectors are all jacked up and you are probably leaning out

Either get that tuned properly or pull those injectors and sell them and then you'll most likely be fine, although the fuel pump at different pressure also changes things too so you kind of have a screwed up setup at this point.
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Old 09-30-2022, 10:15 AM   #9
djoye
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You mention:
"upgraded fuel pump and lines, upgraded radiator, Cold air intake, 1000cc injectors"

Is the intake a Cobb intake and are the injectors the Cobb 1050x injectors? What map is loaded from the AccessPort? I think Cobb has a base map for those specific Cobb parts, but if you're running someone else's intake and injectors, then you need a custom tune for non-Cobb parts or else you'll have major problems.
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Old 09-30-2022, 11:59 AM   #10
rtv900
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Quote:
Originally Posted by djoye View Post
You mention:
"upgraded fuel pump and lines, upgraded radiator, Cold air intake, 1000cc injectors"

Is the intake a Cobb intake and are the injectors the Cobb 1050x injectors? What map is loaded from the AccessPort? I think Cobb has a base map for those specific Cobb parts, but if you're running someone else's intake and injectors, then you need a custom tune for non-Cobb parts or else you'll have major problems.
intake doesn't mean a lick of crap

fuel pump and injectors do
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Old 09-30-2022, 12:10 PM   #11
K3rm1tth3fr0g
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Quote:
Originally Posted by Lancer020 View Post
No. Accessport.
Sir, what MAP are you running?
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Old 10-01-2022, 12:52 AM   #12
Lancer020
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Sir, what MAP are you running?
Stage2 v352 Boost Control
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Old 10-03-2022, 06:37 PM   #13
Bluestreak03
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Probably bad California pee gas brought to Vegas

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