vdubnation
Turboman
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« on: April 19, 2013, 06:06:13 PM »
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Got a temp car till the S4 is completely done been having some boost issues smoke tested , boost leak tested , cars mechanically sound had done all the work my self. I modded my stock file to push around 20psi and its only boosting around 16psi . If i swap to MBC it holds at 20psi and I tried diff working n75's same issue . Any one have a idea heres some logs.
Year: 2002 (B6)
Make: Audi
Model: A4
Engine: 1.8t
Trans: 5 speed
Engine: Modifications : New Rods, Rings , Pistons , Head Gasket ETC.
Turbo: Frankenturbo (wg cracking readjusted for 10psi)
Other Mods: Intake , Exhaust, Downpipes, Greddy Inter-cooler
Stock MAF and Injectors for now
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vdubnation
Turboman
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« Reply #1 on: April 20, 2013, 08:47:57 PM »
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anyone please i even tried playing with the boost pid
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nyet
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« Reply #2 on: April 20, 2013, 11:38:41 PM »
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95% wgdc and underboosting means hardware problem.
n75 not plumbed right maybe.
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littco
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« Reply #3 on: April 21, 2013, 01:02:47 AM »
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Got a temp car till the S4 is completely done been having some boost issues smoke tested , boost leak tested , cars mechanically sound had done all the work my self. I modded my stock file to push around 20psi and its only boosting around 16psi . If i swap to MBC it holds at 20psi and I tried diff working n75's same issue . Any one have a idea heres some logs.
Year: 2002 (B6)
Make: Audi
Model: A4
Engine: 1.8t
Trans: 5 speed
Engine: Modifications : New Rods, Rings , Pistons , Head Gasket ETC.
Turbo: Frankenturbo (wg cracking readjusted for 10psi)
Other Mods: Intake , Exhaust, Downpipes, Greddy Inter-cooler
Stock MAF and Injectors for now
Adjust kfldimx . If actual isn't meeting requested. It needs to be logged though to ensure you're requesting 20psi |
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prj
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« Reply #4 on: April 21, 2013, 02:02:55 AM »
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Adjust kfldimx . If actual isn't meeting requested. It needs to be logged though to ensure you're requesting 20psi
N75 is 95% DC, so does not matter what he is requesting  |
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littco
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« Reply #5 on: April 21, 2013, 06:13:53 AM »
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95% wgdc and underboosting means hardware problem.
n75 not plumbed right maybe.
If n75 wasn't plumbed right it would either over boost or just run actuator pressure. Fact 2 are doing does point to hardware issue agreed. What does it run with n75 unplugged ie just actuator pressure? 14psi as per your graph or 10psi preload? |
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littco
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« Reply #6 on: April 21, 2013, 06:15:19 AM »
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N75 is 95% DC, so does not matter what he is requesting Of course.. Missed that... Opps |
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nyet
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« Reply #7 on: April 21, 2013, 11:25:58 AM »
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he says it holds 20psi with mbc.. so there has to be a n75 issue.
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ddillenger
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« Reply #8 on: April 21, 2013, 11:32:18 AM »
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he says it holds 20psi with mbc.. so there has to be a n75 issue.
He also says he replaced the n75 with no change  My money is on a damaged n75/wastegate line. |
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
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k0mpresd
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« Reply #9 on: April 21, 2013, 12:43:56 PM »
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is anyone else not scared that hes trying to run 20spi from a franken with stock injectors?
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prj
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« Reply #10 on: April 21, 2013, 03:18:34 PM »
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is anyone else not scared that hes trying to run 20spi from a franken with stock injectors?
Well yeah it obviously will melt his engine in the long run, but I don't think anyone on this forum cares about that. Everyone seems to be obsessed with running more and more boost, injector duty cycle seems a foreign concept. The stock injectors won't even do what he is running now, they are done at about 1.1 bar @ 5000rpm, after that you have to drop the boost like a stone to 0.7 at 6k if you don't want to run out. Here's a log from a Stage 2 file bought by someone from a certain member on this forum, that was supposedly made for stock hardware. This log is from a bone stock K03 2.7TT. Nice isn't it? |
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k0mpresd
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« Reply #11 on: April 21, 2013, 04:06:47 PM »
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The stock injectors won't even do what he is running now, they are done at about 1.1 bar @ 5000rpm, after that you have to drop the boost like a stone to 0.7 at 6k if you don't want to run out.
this is exactly what i was saying. i had one b6 car that totally ran out of fuel at 17psi. had to back it down a lot. that was stock k03 and he's trying for 20psi on a ft. |
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prj
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« Reply #12 on: April 21, 2013, 04:27:28 PM »
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Correct, but as I said, no one seems to care about this on this forum.
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vdubnation
Turboman
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« Reply #13 on: April 21, 2013, 09:19:45 PM »
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so i went out bought all new hoses and a brand new n75j valve car boost a little higher than what i m requesting 22-23 but once i go over 4300 rpm i get this fluctuating boost 10 20 10 20 10 20 the neddle goes back and forth i hear my diverter woosh woosh woosh
ps: i have some bigger injectors and bigger maf just trying to get one thing at a time fixed was having a wg issue forever
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littco
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« Reply #14 on: April 21, 2013, 11:16:52 PM »
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so i went out bought all new hoses and a brand new n75j valve car boost a little higher than what i m requesting 22-23 but once i go over 4300 rpm i get this fluctuating boost 10 20 10 20 10 20 the neddle goes back and forth i hear my diverter woosh woosh woosh
ps: i have some bigger injectors and bigger maf just trying to get one thing at a time fixed was having a wg issue forever
Turbos surging or the DV opening.. If its surge its dangerous for the turbo and you'll need to cap below the boost surge line. If its the dv then just try another one. |
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