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Old 02-26-2014, 05:33 AM   #1
srkiley
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Default JDM EJ205 Tuning Questions

Okay so I have a 2005 jdm ej205 with a vf39, sti tmic, 3" tbe, 38mm ewg, tgv deletes, 565cc pink injectors, grimmspeed 3port ebcs dw200 fuel pump, all installed into my 2002 wrx. I tuned it myself and I have some questions about timing.

Lets start: its a jdm ej205 so its 9.0:1cr vs the USDM 8.0:1cr. From what i have read you have to lower timing for higher compression ratios.
Also i have an external wastegate which in tuning allows you to remove even more timing? (and add fuel due to better volumetric efficiency?)
Anyway after lots of logging/tuning my timing is down to a low of 8 degrees at WOT!? is that normal? does that mean my VE is really high?

The car runs/pulls awesome and keeps up to my buddies td05 gc8 with the same injectors/boost levels. Im just wondering if theres more i can be getting out of it or is this it? Ill attach my map
https://onedrive.live.com/redir?resi...nt=file%2c.bin
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Old 02-27-2014, 08:17 AM   #2
quazimoto
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Are you removing timing because the car actually knocked?
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Old 02-28-2014, 02:43 AM   #3
Bluestreak03
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2003 18g ej255 swap
04 STI WRB

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better volumetric efficiency means that you do not have to run as much timing to achieve your desired point , being more efficient , only a dyno would truly be able to tell you where you need to be at on the timing curve.
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Old 02-28-2014, 02:44 AM   #4
Bluestreak03
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04 STI WRB

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it can be at 8 degrees but there's nothing saying that you are pulling max horsepower and torque out of the engine
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Old 02-28-2014, 07:00 AM   #5
srkiley
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quazimoto yes i was removing timing because of knock, im sure i can add some back in a few places but havent gotten around to it, but it is for sure really low.
so higher compression+ewg=better VE=less timing? peak psi is about 19.5
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Old 03-01-2014, 12:55 AM   #6
AlexTRD
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2005 WRX td06-20g
WRB v8 ej207/C32 AMG

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An ewg negligibly affects ve, especially compared to things like compression. For all intensive purpose it has a similar effect as running a bigger turbine housing (without sacrificing spool) or larger exhaust. This also doesn't necessitate a change in fueling, adding fuel will probably net you a loss in power anyways. Seeing as ej's are very knock limited, if you run as much timing as you can without detonation, it's safe to assume you're making max hp (if you were on race gas or e85 at some point more timing will lose power). There are many variables here that dictate timing, but I've ran as much as -5 degrees timing at wot on 9.0:1 comp motors and made good power.
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Old 03-01-2014, 03:07 AM   #7
srkiley
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Thank you very much AlexTRD that comforts me lots haha
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Old 03-18-2014, 07:35 PM   #8
aprnsk
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I have a 2003 jdm stock ej205 with a Kinugawa TD05-16G, sti tmic, 3" exhaust, iwg, tgv absent, 550cc pink injectors, grimmspeed 3port ebcs, dw200 fuel pump.
AFR about 10.8, timing at WOT about 13-14 degrees, boost 18psi.
Man, I think you have a some problems (with fuel or car or tuning).

Last edited by aprnsk; 03-18-2014 at 07:41 PM.
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Old 04-02-2014, 02:45 AM   #9
dmacnz
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a JDM Ej207 running a DOM3 at 1.5
timing is about 12 degrees at maw TQ and 20 degrees and 7500rpm

Dunno if that helps
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