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Old 07-09-2012, 04:09 PM   #1
JDMFLCL
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Location: Super Eurobeat Vol 193..Denver
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Baby Baby C'mon!
Looka Bomba! 99 JDM GM8

Default 6k ecu on 91 octane?

Basically can I run the following setup on 91

6k ECU
95 EJ20G
95 td05-16g
oem boost control solenoid (stock 13.64 psi)
walbro 255 lp/h
3" catless turboback
wrx coilpacks w/ BKR7E @ .028 gap.
Relevant telemetry (Wideband/Oil PSI/Oil Temp/Boost)

I've done a search here were some said it might be dangerous, but others did not seem to share the same concerns.
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Old 07-09-2012, 05:05 PM   #2
TommyAtomic
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Safe to go for sunday drives? Probably. Safe to thrash it at the track? Probably not a good idea.

94 octane is a much better safer option.

It's much easier and safer for people here to tell you that its going to go badly and then be wrong then it is for people to tell you its just fine and be wrong.

You dont need anyone's permission to fill your tank with borderline insufficient octane fuel. But safely driving with insufficient octane generally requires lower ambient air temp. This leads to a lower intake air charge temp and more effect performance from your inter-cooler. A lower engine temp couldn't hurt either. I'm sure you already know this.

You can go fmic, which if done well can reduce your intake air charge temp quite nicely as such its typically the first step people take before safely turning up boost. More boost increases temp so you could also get an MBC and limit the boost to say 10psi to prevent potential detonation . Up to you.

Really its a matter of if you understand what higher octane fuel means and if you understand what causes detonation. High octane fuel doesnt contain more power. More octane means more controlled combustion through less volatility.

You can get the same control through lowering temperatures.
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Old 07-09-2012, 06:08 PM   #3
69subaru360
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Yes it's ok. I ran that exact combo when I first did my swap. I had to travel out of state a few times with it where I could only get 91. I though it would drop the IAM, so I checked it on the road, but it didn't.
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Old 07-09-2012, 06:12 PM   #4
JDMFLCL
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I already have a fmic. Will a fmic+VTA work with non oem boost control? I have a MBC+CX FMIC. Say MBC @ 13.64 PSI, CX FMIC w/ VTA bov and plugged intake hole. Or do the jdm ecus not like VTA bovs?

I do not have access to 94. I'm trading back from a PFC setup and potentially selling the car.

Last edited by JDMFLCL; 07-09-2012 at 06:17 PM.
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Old 07-09-2012, 06:26 PM   #5
69subaru360
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If you have a fmic you want to use a mbc. The bov is fine too.
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Old 07-09-2012, 06:30 PM   #6
JDMFLCL
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I see. So the 6k ecu will run fine with the above setup just like the z4.
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Old 07-09-2012, 06:50 PM   #7
69subaru360
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They aren't much different really.
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Old 07-09-2012, 09:55 PM   #8
JDMFLCL
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I see. I ran the z4 ecu on 91 octane gas for 2 years with no problems. Would you say I could do a trackday maybe with boost turned down to 12?
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Old 07-09-2012, 11:15 PM   #9
blessthekellen
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Answer is yes you can.
Highly recommend Robs tune however. Really wakes up the EJ20G on 91 octane.
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Old 07-09-2012, 11:35 PM   #10
69subaru360
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Quote:
Originally Posted by JDMFLCL View Post
I see. I ran the z4 ecu on 91 octane gas for 2 years with no problems. Would you say I could do a trackday maybe with boost turned down to 12?
No idea, I don't do those.
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Old 07-10-2012, 12:27 AM   #11
JDMFLCL
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Looka Bomba! 99 JDM GM8

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I see
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Old 07-10-2012, 12:39 AM   #12
eg33GC
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there is low risk, the ecu drops iam quickly
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Old 07-10-2012, 12:51 AM   #13
pmugabi
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Yes, there is low risk if the IAM never gets to zero, the ECU is very good at managing det.

When I first logged IAM, I was shocked to find it pegged at zero. To me that explained the number of engines I had gone through in the previous 2 years (at least 5). I've not had a single failure since I redid the tune, so avoiding det is extremely important.

Maybe the OP should invest in a data logging cable and check that the IAM is always above 8, that way there is a margin of safety.
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Old 07-10-2012, 10:09 AM   #14
JDMFLCL
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Looka Bomba! 99 JDM GM8

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jake can you pm me please? also which type of datalogging software do you guys recommend? I'm used to using a PFC commander where I can view everything.

Is the 6k ecu really too aggressive for 91 when driven in anger?
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Old 07-10-2012, 12:11 PM   #15
pmugabi
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Evoscan works best for me. There are a couple of free loggers like the Ecutune one but I've never got them to work.
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Old 07-10-2012, 12:42 PM   #16
JDMFLCL
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Baby Baby C'mon!
Looka Bomba! 99 JDM GM8

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I see. If i bought evoscan, is there anything I could do aside from letting off to ensure the car running safely on 91 octane?
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Old 07-10-2012, 12:49 PM   #17
69subaru360
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Quote:
Originally Posted by JDMFLCL View Post
Is the 6k ecu really too aggressive for 91 when driven in anger?
I've run the 6K hard on the street on 91 a few times during road trips when I couldn't get 93 and the IAM stays at 16, but I don't know about a track day, I don't have experience with that.
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Old 07-10-2012, 12:59 PM   #18
JDMFLCL
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Looka Bomba! 99 JDM GM8

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I see. What would power output be around? 200-210whp?
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Old 07-13-2012, 11:51 AM   #19
JDMFLCL
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Looka Bomba! 99 JDM GM8

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Reporting back. Car ran absolutely flawlessly. I even romped on it once
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