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02-06-2023, 01:22 PM | #1 |
Scooby Newbie
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Join Date: Feb 2023
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Built motor not combusting properly and no power
Hi all, this is my first ever post on this forum so excuse me if this is in the wrong area to post...
2 Weeks ago, my STi turned off in the middle of the road with no rpm reading. I assumed it was the crank sensor, so I changed it out, and still no rpm reading, so the car wouldn't start. Decided to check the Crank Sprocket and it was pretty worn out and was missing a couple of teeth. Replaced the Sprocket, redid the timing, and she fired right up. Went for a test drive, hit 25psi, and let out 2 huge bangs- the car barely moved it felt as if it were N/A. A couple of minutes after getting her she started to misfire as if it was out of time, looked down at the timing to see if it was out whack and if all the marks lined up as they should. Everything checked out, decided to swap spark plugs and, and coil packs, and still misfires. Did a compression test of 120psi on all 4 cylinders. It doesn't have a misfire code, and it doesn't have any ridiculous amounts of cylinder roughness, but its audible sounds like improper combustion. I am starting to get concerned with the possibility of bent valves or something wrong internally. Mod list: Outfront motorsports V4 Ultra Short block IAG 11MM ported oil pump 1/2 Inch head studs Athena Firelock HG Kelford 282 Camshafts GSC Beehive Springs GSC Stopper Style Guides Manley Intake/Exhaust Valves STD Size Manley Keepers 6MM Viton Seals ETS FMIC Kit with 4inch Core Treadstone Rotated Turbo Kit HKS Equal Length Headers Precision 6262BB Radium Fuel Hanger with 2 Wahlboro 450s Injector Dynamics 2000CC Injectors Torque Solutions TVG Deletes Torque Solutions 8MM Phelonic Spacers Grimmspeed 3 Port Boost controller Competition Clutch Rigid Triple Disc Tial 50mm BOV Aeromotive fuel pressure regulator The car made 652whp on E85, pre-green speed update.
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02-06-2023, 01:35 PM | #2 |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Have you taken logs and send them to your tuner?
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02-06-2023, 01:38 PM | #3 |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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02-06-2023, 01:59 PM | #4 | |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Quote:
Without him seeing your logs, his opinion from watching your videos is useless and pointless. If that's how he diagnoses his customers issues I would run from that tuner. Can you post your logs here? Last edited by BlackFighter; 02-06-2023 at 03:21 PM. |
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02-06-2023, 02:12 PM | #5 |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Any tuner worth their salt is going to offer to review logs and or investigate the car if a customer is reporting issues.
Especially if that customer is a 600+WHP build that should have had much care put into tuning and configuration. Seems you need to find a better tuner. |
02-06-2023, 02:29 PM | #6 |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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Yeah, I can post the log, what should I be logging?
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02-06-2023, 02:55 PM | #7 |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
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02-06-2023, 03:05 PM | #8 |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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2.5L
I do one or 2 pulls a day and never push it past 4th gear. Do oil changes every 1500 miles, and change spark plugs every 2 oil changes. |
02-06-2023, 03:05 PM | #9 |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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2.5L
I do one or 2 pulls a day and never push it past 4th gear. Do oil changes every 1500 miles, and change spark plugs every 2 oil changes. |
02-06-2023, 03:26 PM | #10 | |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Quote:
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02-06-2023, 03:26 PM | #11 | |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Quote:
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02-06-2023, 03:48 PM | #12 |
Scooby Specialist
Member#: 30804
Join Date: Dec 2002
Chapter/Region:
SWIC
Vehicle:87 Yugo Red |
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02-06-2023, 03:52 PM | #13 | |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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Quote:
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02-06-2023, 05:35 PM | #14 |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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I just redid timing yet again, and it still sounds weird. What would I log in AP? Let me know
Kind Regards |
02-06-2023, 08:18 PM | #15 |
Scooby Newbie
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Vehicle:2015 WRX & Forester Blue & Black |
can you post pics or video of the car?
does anyone else find it peculiar that a person who claims to have spent $10,000+ on a motor coming onto a forum to find answers to mystery bangs rather than going back to the person who built the car and having them figure it out? this person seems like a troll |
02-06-2023, 10:00 PM | #16 | |
Scooby Newbie
Member#: 533103
Join Date: Feb 2023
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Quote:
https://drive.google.com/file/d/1Yvr...usp=share_link https://drive.google.com/file/d/1rXN...usp=share_link Here are some videos... |
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02-06-2023, 10:01 PM | #17 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Quote:
Yes but why waste their own time? This doesn't strike me as a troll post necessarily - just a novice who likely has more money than sense |
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02-07-2023, 07:11 AM | #18 | |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
be realistic man, you are draining brand new oil to replace with brand new oil and seriously swapping plugs at 3000 miles? sheesh Anyhow, if you are pushing that full power daily out of 2.5 liters I know the answer. Your engine is at the end of it's life and it is failing and in need of a full rebuild. You can't get 650 wheel HP out of 2.5 liters and expect it to last in any meaningful way. so now in addition to the 10 grand you put in, you need another 10 grand. All that plus the car itself plus more money on other things. . . .you should just buy a platform that can actually handle that power level and not die in short order. |
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02-07-2023, 07:42 AM | #19 |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Last edited by K3rm1tth3fr0g; 02-07-2023 at 09:11 AM. |
02-07-2023, 09:41 AM | #20 | ||
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
Quote:
Quote:
Last edited by BlackFighter; 02-07-2023 at 10:23 AM. |
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02-07-2023, 09:41 AM | #21 |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
.....
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02-07-2023, 09:59 AM | #22 |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
OP what year is your sti?
Last edited by K3rm1tth3fr0g; 02-07-2023 at 10:07 AM. |
02-07-2023, 10:17 AM | #23 |
Scooby Specialist
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:2004 WRX STI Black RalliSpec Shortblock |
By the tech, looks like a GD.
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02-07-2023, 10:55 AM | #24 |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
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02-07-2023, 11:23 AM | #25 |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Everyone has a different number they put on E85 OCIs but general wisdom is keep it a short as you feel comfortable, typically well under 3,000. IAG suggests 1000-1500. Killer B suggests 1000-2000 depending on the individual engine's UOAs.
Blackstone labs recommends keeping OCIs low only if you're running E85, and are actually large proponents of extended oil use in the right sceneros. But for an ethanol fuel application, UOA results agree that lower mileage intervals are much more important vs traditional gasoline to maintain oil lubrication and protection. If you want to keep your 2.5L making 600WHP, especially on corn, the first step is to keep it happy with fresh high quality oil. |
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