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Old 12-21-2020, 12:58 PM   #8876
undyjr
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Member#: 459692
Join Date: Dec 2016
Chapter/Region: South East
Location: Hampton Roads Va
Vehicle:
2019 WRX STI
silica black

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I wanted to run something by you all. My 2019 STi is FBO, flex fuel, and 20G XTR. In the process of pulling the header to install my Perrin motor mounts I noticed the primary for cylinder #4 (just had to be #4) was black and the other three were a light tan. Rubbing your finger left no residue. Looking into the exhaust ports I saw no differences between the four. When I was initially dyno tuned for stage two the motor passed a compression test done by the tuning shop. That was about 10K miles ago and now I'm tuned for a 20G XTR, EWG, and Killer Bee holy header. I opted for a conservative tune that netted 380WHP and 370WTQ on a dyno jet. Ever since my factory specified break in I consume 1 qt every 3k miles. I do get on it frequently and do a lot of engine braking so the oil consumption doesn't concern me too much. Every one of my Blackstone oil analysis's has come back good. Knock consists of the occasional 1.41 at high load tip in and never during WOT.

I've decided to do a step by step diagnostics process that my tuner an I have agreed on. First is after 10+ tanks of E70-80 I ran a tank of 93 through it and was surprised at how fast my exhaust tips sooted up. After a couple more tanks of 93 I intend on pulling the header and inspecting it. If the primary is still black I will pull the plugs, inspect, and compression test. While I'm under there I will install the cylinder 4 cooling kit I got last Christmas. I'd like to add that at no point in time is smoke apparent from the exhaust, start up or otherwise.

So on to my question. Do those of you that go from E85 to 91/93 experience the sooting up of the exhaust tips? My hope is that my ID1300 injector for #4 was dirty and delivering too much fuel and the 93 will clear it up. The way the car runs has given me no indication there is an issue. Any insight you all could offer would be appreciated.
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Old 12-30-2020, 11:26 PM   #8877
jesseisbeast
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Member#: 465688
Join Date: Apr 2017
Location: Southern California
Vehicle:
2008 WRX
Gray

Default 2008 WRX JDM 2.0 Swapped

362 WHP & 337 WTQ on Dynapack / jesseisbeast / 08 WRX hatch / JDM 2.0 swap + Tomioka 20G / 1000cc @ 98% / @ sea level


Forged internals and full bolt ons. Could have made more power but we ran out of injectors. I also think I have a preturbo exhaust leak which is why the spool is so slow. Tuned by Henry at Church automotive.

Last edited by jesseisbeast; 01-03-2021 at 04:27 PM.
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Old 01-01-2021, 06:34 PM   #8878
tjmazz13
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Member#: 291681
Join Date: Aug 2011
Chapter/Region: MAIC
Location: Baltimore, MD
Vehicle:
2004 Pearl White STi
IAG1000, PTE6870, Haltech

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2004 STi
60*/479ft above sea level
891whp/825wtq Mustang Dyno
FIC2600cc injectors
Precision Gen2 [email protected] E80
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Old 01-27-2021, 03:14 PM   #8879
lidrew
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Location: LONG ISLAND
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2011 STi
Dgm

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Quote:
Originally Posted by tjmazz13 View Post
2004 STi
60*/479ft above sea level
891whp/825wtq Mustang Dyno
FIC2600cc injectors
Precision Gen2 [email protected] E80
Damn ! I would be happy with 400 whp.
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Old 02-08-2021, 08:49 PM   #8880
nerz
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Quote:
Originally Posted by tjmazz13 View Post
2004 STi
60*/479ft above sea level
891whp/825wtq Mustang Dyno
FIC2600cc injectors
Precision Gen2 [email protected] E80
I would like to see the cliff of this dyno graph.
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Old 02-24-2021, 05:59 PM   #8881
highrevracer951
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Member#: 141470
Join Date: Feb 2007
Chapter/Region: SCIC
Location: Riverside, Ca.
Vehicle:
2017 STI
CWP

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Good afternoon everyone. I have another question before I go flex fuel. I already have all the parts to go flex but my tuner recommends I go with an EWG prior to coming in for a tune. Is this a necessary piece (I donít have a problem doing it) or is the stock setup ok for flex. I currently am tuned with 1050 injectors, turbo inlet, catless TB, grimmspeed fmic and intake, 3 port ebcs, and regulator. If an EWG is recommended, Iím looking at the grimmspeed one as it looks like a well built piece. Any help would be great, thanks again everyone.
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Old 02-28-2021, 09:16 AM   #8882
milab21
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Join Date: Aug 2007
Chapter/Region: Tri-State
Location: NJ Jersey Shore
Vehicle:
2017 WRB STI
2007 WRB STI-sold

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Quote:
Originally Posted by highrevracer951 View Post
Good afternoon everyone. I have another question before I go flex fuel. I already have all the parts to go flex but my tuner recommends I go with an EWG prior to coming in for a tune. Is this a necessary piece (I donít have a problem doing it) or is the stock setup ok for flex. I currently am tuned with 1050 injectors, turbo inlet, catless TB, grimmspeed fmic and intake, 3 port ebcs, and regulator. If an EWG is recommended, Iím looking at the grimmspeed one as it looks like a well built piece. Any help would be great, thanks again everyone.
Not necessary but I feel like that is the go to setup for stage 2 +. Also I would do it just because your tuner should know best. It will help control boost. I have the same mod list as you, with grimmspeed external wastegate, minus the front mount. I have a killer b elh as well. 344whp 376wtq E66 on primes mustang dyno. That was recommended to me. Good luck with your decision
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Old 02-28-2021, 09:24 AM   #8883
K3rm1tth3fr0g
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Chapter/Region: NWIC
Location: Seattle, WA
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VF39 + 4.44 5MT

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Quote:
Originally Posted by highrevracer951 View Post
Good afternoon everyone. I have another question before I go flex fuel. I already have all the parts to go flex but my tuner recommends I go with an EWG prior to coming in for a tune. Is this a necessary piece (I donít have a problem doing it) or is the stock setup ok for flex. I currently am tuned with 1050 injectors, turbo inlet, catless TB, grimmspeed fmic and intake, 3 port ebcs, and regulator. If an EWG is recommended, Iím looking at the grimmspeed one as it looks like a well built piece. Any help would be great, thanks again everyone.

The problem with the VF turbos is they like to boost creep a lot especially at higher boost so going EWG is a great idea and you should 100% listen to your tuner if they say its an important piece of the puzzle for your build.
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Old 03-02-2021, 09:56 PM   #8884
taxkourel
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
The problem with the VF turbos is they like to boost creep a lot especially at higher boost so going EWG is a great idea and you should 100% listen to your tuner if they say its an important piece of the puzzle for your build.


Agreed. Had exact same issue (boost creep) than an ewg resolved
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Old 03-04-2021, 12:01 AM   #8885
highrevracer951
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Join Date: Feb 2007
Chapter/Region: SCIC
Location: Riverside, Ca.
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2017 STI
CWP

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Thank you guys for the replies. I ended up getting the ewg so I just need to set up a dyno time to get the flex set up.
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Old 03-04-2021, 09:42 AM   #8886
eaglehunter
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Dark Grey Metallic

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For the ewg you get different springs that actuate at higher or lower psi. Depending on what your tuner recommends, I suggest going for a stronger spring that opens at higher boost... it helps to not hve to be too careful with the throttle when you dont want it to be loud... mine starts opening around 7psi and I wish I had known about it beforehand. I would have prefereed it opening somewhere between 12 and 15 psi...
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Old 03-12-2021, 10:16 AM   #8887
tjmazz13
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IAG1000, PTE6870, Haltech

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Quote:
Originally Posted by nerz View Post
I would like to see the cliff of this dyno graph.


The dip you see in the graph was from the car getting loose and starting to spin some.
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