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Old 04-18-2009, 11:17 PM   #1
clean 93
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Default Fuel cut defender 1993 WRX

Hey, I noticed in one of the posts a guy with a 1995 ej20k is using a fuel cut defender with his EBC. I have a November 1992 production WRX. It has the following mods.

-an AEM intake (Adapted from different car works great),
-am installing a turbo back exhaust this week Apexi N-1,
-and have just finished putting in a Greddy Profec-B Spec 2 EBC
-aquamist water/meth injection in two weeks.

My question is, where is the factory fuel cut on one of these cars? I haven't heard that I'll need a fuel cut defender for running my goal boost levels of 15-16psi.
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Old 04-18-2009, 11:20 PM   #2
rockcrete
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It will cut right around 16 psi.

Since I installed my new turbo, my car fuel cuts ALL the time, but the wagon cuts at 13 psi.

I just bought myself a PFC to get around that......
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Old 04-18-2009, 11:58 PM   #3
Jaxx
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your mode list makes no sense ..
there is no reason to install water/meth with out em
and there is no reason for a FCD with em

don't run more than 14 psi with out em and injectors ..
ej20gs reallly need bigger injectors to do any thing

also the intercooler will start to fail at 17 psi
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Old 04-19-2009, 12:10 AM   #4
clean 93
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Quote:
Originally Posted by Jaxx View Post
your mode list makes no sense ..
there is no reason to install water/meth with out em
and there is no reason for a FCD with em

don't run more than 14 psi with out em and injectors ..
ej20gs reallly need bigger injectors to do any thing

also the intercooler will start to fail at 17 psi
EJ20g's have a tendency to run leaner than I would like when the boost is turned up. I have talked to a number of people, notably Rocket Rally in Squamish who have tuned the JDM WRX's with the stock computer to run safely at 16 psi with the factory ecu and 91 or lower octane using the Aquamist. But, I won't know for sure until I have my AFR hooked up. Some of the ones they worked on were running as high as 12.5:1. I would like to see more along the lines of 10.5 to one, I will reach that by using the aquamist and small injector to help richen the mixture as well as increase my effective octane level while running higher boosts. The EJ20G was made to run appoximately 98 octane fuel and when I'm not in Vancouver, it is hard to find even the 94 or 92 octane. Knocking is bad for me :- ] The aquamist which runs off of the injector duty cycle could richen my mixture slightly and increase my octane level without the necessity of an aftermarket ecu. Power FC is my first choice though and I still plan on getting one later this summer.
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Old 04-19-2009, 01:10 AM   #5
rockcrete
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98 octane research (which is what Japan had at the time these cars were new) is only around 91 - 92 in our measurement.......

The only reason you would be lean at 16psi is because the stock injectors are too small......

These cars are pig rich on the stock maps.

Also, the stock slanty intercooler isn't much good for anything - let alone 17psi........
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Old 04-19-2009, 03:27 AM   #6
clean 93
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Thanks a lot for the input. As for the running lean comment, I was refering to running lean under heavy boost, and yes, the injectors are too small. Are you running a different intercooler Rockcrete? i.e. a ver.1 or ver.2 sti intercooler?
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Old 04-19-2009, 10:10 AM   #7
Jaxx
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you are playing with fire with that setup
heavy boost on a ej20g is any thing greater than 12 psi (stock)...
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Old 04-19-2009, 10:39 AM   #8
sniper512
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I am having Rob get my tuned ECU ready today and plan on 14psi. I have an upgraded TMIC and TBE. A Southbend Rally Spec Stg1 Clutch is on the way as well. I have heard that 14-15psi is pretty much it for stock fueling, but also that if you run water/meth some guys have had it up around 17-18psi which seems a bit crazy too me. The thing with running water/meth for extra fueling and big timing that high is that if you ever run out well by by engine as my best friend is finding out on his turboed 331 in his Mustang
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Old 04-19-2009, 01:28 PM   #9
rockcrete
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I have a bugeye intercooler - haven't installed it yet as my machinist friend is taking forever to move the BOV for me - hopefully I'll have it back this week and get it on.

I've gone to an EVO III TD05H-16G and my intercooler is quite warm to the touch after only one good blast down the street wheras it was always cool with the stock TD04 (stock wagon turbo).

I have an EJ20G Power FC coming from Japan right now and we'll see what it says before I do anything else to my motor.

I'm going to have to come up with something to keep my TCU happy with the Power FC too (my car is auto) but that shouldn't be very difficult.

The last thing I need is a stall convertor - I don't make much of anything until 4000 rpm and then WHAM it's off........ mapping MAY help that a bit anyway - more timing down low and fixing the mixture.....
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Old 04-19-2009, 04:58 PM   #10
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Quote:
Originally Posted by Jaxx View Post
your mode list makes no sense ..
there is no reason to install water/meth with out em
and there is no reason for a FCD with em

don't run more than 14 psi with out em and injectors ..
ej20gs reallly need bigger injectors to do any thing

also the intercooler will start to fail at 17 psi
Like Jaxx said, running water/meth without em is pointless and a waste of money. Your ecu doesn't know you're running water/meth, so you're just dumping it in there for no reason. You really shouldn't be upping boost without the ability to tune for it. Otherwise you're just blindly stabbing in the dark and hoping you don't pop your motor.
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Old 04-19-2009, 06:19 PM   #11
thad
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Quote:
Originally Posted by clean 93 View Post
...
lots of good info in this forum that can help you, cross check everything before you commit it to memory as fact, some of the stuff you've mentioned is throwing up some red flags.
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Old 04-19-2009, 07:05 PM   #12
clean 93
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Quote:
Originally Posted by thad View Post
lots of good info in this forum that can help you, cross check everything before you commit it to memory as fact, some of the stuff you've mentioned is throwing up some red flags.
Thanks for the input. I'm taking everything in with a grain of salt. But any input is appreciated

Last edited by clean 93; 04-19-2009 at 07:31 PM.
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Old 07-03-2009, 02:15 AM   #13
clean 93
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Bringing this thread back from the dead. I am running Aquamist HFS-5 with factory ECU. I am liking what I'm seeing for AFR's although a bit richer than would be with a tune . Running up to 16 psi and works great. Thanks for the info.
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Old 07-03-2009, 09:30 AM   #14
scrappydoo
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You using a wideband?
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Old 07-03-2009, 09:37 AM   #15
clean 93
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Yah, I'm using the innovate LC-1 so I can datalog on my laptop. Works nicely.
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Old 07-03-2009, 08:09 PM   #16
ncarn8
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how did you modify the EVO III TD05 to fit?
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Old 07-04-2009, 03:03 AM   #17
clean 93
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Quote:
Originally Posted by ncarn8 View Post
how did you modify the EVO III TD05 to fit?
It's a stock td05. Or are you asking rockrete?
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