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Old 02-06-2023, 01:22 PM   #1
epicdonut
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Default 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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Old 02-06-2023, 01:35 PM   #2
K3rm1tth3fr0g
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Have you taken logs and send them to your tuner?
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Old 02-06-2023, 01:38 PM   #3
epicdonut
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Have you taken logs and send them to your tuner?
I have not sent him logs, but sent him a couple of videos of how the car sounds, and he tells me that the car sounds normal, but I know for a fact it doesn't.
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Old 02-06-2023, 01:59 PM   #4
BlackFighter
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Quote:
I have not sent him logs, but sent him a couple of videos of how the car sounds, and he tells me that the car sounds normal, but I know for a fact it doesn't.
So your setup is close to mine, besides the block being a destroker.

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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Old 02-06-2023, 02:12 PM   #5
K3rm1tth3fr0g
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Have you taken logs and send them to your tuner?
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.
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Old 02-06-2023, 02:29 PM   #6
epicdonut
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Yeah, I can post the log, what should I be logging?
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Old 02-06-2023, 02:55 PM   #7
rtv900
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Quote:
Originally Posted by epicdonut View Post

The car made 652whp on E85, pre-green speed update.
Is it a 2 liter or a 2.5? I don't think you said that anywhere.

How often do you actually push that full power out of that thing?
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Old 02-06-2023, 03:05 PM   #8
epicdonut
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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.
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Old 02-06-2023, 03:05 PM   #9
epicdonut
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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.
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Old 02-06-2023, 03:26 PM   #10
BlackFighter
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Quote:
Do oil changes every 1500 miles, and change spark plugs every 2 oil changes.
That is a little over kill.
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Old 02-06-2023, 03:26 PM   #11
BlackFighter
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Quote:
Do oil changes every 1500 miles, and change spark plugs every 2 oil changes.
That is a little over kill.
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Old 02-06-2023, 03:48 PM   #12
cboggess
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Quote:
Originally Posted by epicdonut View Post
Do oil changes every 1500 miles, and change spark plugs every 2 oil changes.
That is a little over kill.
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Old 02-06-2023, 03:52 PM   #13
epicdonut
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Quote:
Originally Posted by rtv900 View Post
Is it a 2 liter or a 2.5? I don't think you said that anywhere.

How often do you actually push that full power out of that thing?
Quote:
Originally Posted by cboggess View Post
That is a little over kill.
Quote:
Originally Posted by BlackFighter View Post
That is a little over kill.
When you've spent 10,000 on the motor alone, Its nice to have a piece of mind
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Old 02-06-2023, 05:35 PM   #14
epicdonut
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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
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Old 02-06-2023, 08:18 PM   #15
Ferretts
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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
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Old 02-06-2023, 10:00 PM   #16
epicdonut
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Quote:
Originally Posted by Ferretts View Post
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
That seems like a rather unintelligent assumption... I built the motor, so there's no person to go back to, there's just me. I came to the forums because I had exhausted all the means to find the issue myself.

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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Old 02-06-2023, 10:01 PM   #17
K3rm1tth3fr0g
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Link G4X flex tuned
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Quote:
Originally Posted by Ferretts View Post
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

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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Old 02-07-2023, 07:11 AM   #18
rtv900
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Quote:
Originally Posted by epicdonut View Post
When you've spent 10,000 on the motor alone, Its nice to have a piece of mind
blatantly wasting resources for literally no gain at all gives you peace of mind?
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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Old 02-07-2023, 07:42 AM   #19
K3rm1tth3fr0g
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Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Quote:
Originally Posted by rtv900 View Post
blatantly wasting resources for literally no gain at all gives you peace of mind?

be realistic man, you are draining brand new oil to replace with brand new oil and seriously swapping plugs at 3000 miles?

sheesh
E85 is what is necessitating the short OCIs

Last edited by K3rm1tth3fr0g; 02-07-2023 at 09:11 AM.
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Old 02-07-2023, 09:41 AM   #20
BlackFighter
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RalliSpec Shortblock

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Quote:
That seems like a rather unintelligent assumption... I built the motor, so there's no person to go back to, there's just me. I came to the forums because I had exhausted all the means to find the issue myself.

https://drive.google.com/file/d/1Yvr...usp=share_link

https://drive.google.com/file/d/1rXN...usp=share_link

Here are some videos...
Used my ****ty work headphones but it sound like a freaking diesel truck. Did it always sound like that?

Quote:
I am starting to get concerned with the possibility of bent valves or something wrong internally.
That is where I'm leaning too. Sounds like it is passing gasses somewhere. Do a leak down test. What was your deck clearance and your lash?

Last edited by BlackFighter; 02-07-2023 at 10:23 AM.
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Old 02-07-2023, 09:41 AM   #21
BlackFighter
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.....
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Old 02-07-2023, 09:59 AM   #22
K3rm1tth3fr0g
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Link G4X flex tuned
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OP what year is your sti?

Last edited by K3rm1tth3fr0g; 02-07-2023 at 10:07 AM.
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Old 02-07-2023, 10:17 AM   #23
BlackFighter
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By the tech, looks like a GD.
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Old 02-07-2023, 10:55 AM   #24
rtv900
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
E85 is what is necessitating the short OCIs
E85 needs 1500 mile OCI's?
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Old 02-07-2023, 11:23 AM   #25
K3rm1tth3fr0g
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Quote:
Originally Posted by rtv900 View Post
E85 needs 1500 mile OCI's?
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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