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Old 10-19-2021, 12:36 AM   #1
Scooby Newbie
Member#: 513053
Join Date: Apr 2020
Default 2015 WRX with large FKL and DAM of .75

Hello Everyone,
First - thanks for your info and experience. I have been lurking on here for a couple years and never really had anything to contribute.

I have had my '15 WRX for about 2 years now and decided it was time to start working on having a little more fun.
Right now, there's very little in the way of "mods" that affect performance. Just a normal air filter, mishimoto radiator (factory was getting brittle) and AP.
I booted up the Stage 1 OTS tune, and it was great! I could totally feel it took off better and no more falling on its face mid-rpm.

After a couple of days, it had a hesitation. After some reading on here, I swapped up my monitors and have IAT, oil temp, FKL, boost, fuel press, AFR. Seems to cover most basis to see what was going on.
I noticed the FKL going to -4.4. It didn't seem to be going too low on AFRs, it wasn't overboosting, etc.
On my way back from SoCal Subie Fest, I noticed that hesitation was even worse. Now it's -5.6.

I'll admit to experimenting with low ethanol levels (~2 gal of E85 for a full tank of 91). I did this for ~ 3 tanks now and will likely stop in case it is throwing something off, but from basic research, this is somewhere around E15-20 at those proportions.
PhatBotti E85 Testing

I'll apologize for the newbie question, but anyone have ideas on what to do?

Because I've done enough reading on here to know, I am planning on getting real tunes, but I haven't truly modified anything yet.
Also, I do have logs. I posted them on Drive, let me know if this link works or if there is a better way to do this - Drive Link

If anyone wants to know my long term (performance) plans (in a rough order) -
Mishimoto intake
3 port EBCS
Flex Fuel
AEM 340lph pump
Mishimoto J pipe
Factory catback - with cutout after cat. Noise + power, with a switch.

Control / Handling -
1" lift - Done (I end up in dirt a lot)
Powerstop D&S rotors all around - Done
Front strut tower brace - Done
Whiteline swaybars and links - soon?

Cosmetic stuff is for last.

I had the whole charge pipe/ intercooler/ header planned, but I don't want to make resetting to smog legal THAT hard on myself. I can unplug the flex fuel and bypass the EBCS, swap J pipes and reflash to factory probably in an easy afternoon.

If anyone has comments about the current issue or future plans, I'd welcome additional info.

Update - Got a new air filter as I read it could be that, no change.
Update 2 - DAM is now showing .625 and I saw a spike in FKL of ~-7. That hesitation is VERY noticeable.
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Last edited by DrHarter; 10-21-2021 at 01:22 AM.
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