My ej20g dyno results

[rob]

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EDIT: CLICK HERE FOR UPDATED RESULTS


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Hey all,

I attended a dyno day last Saturday and thought I would share my results. Some of you know I have been playing with Eprom tuning with STi injectors, and I'm happy to say I am running these with chipped Z4 ECU.

265HP, 239TQ @ 16.2psi

Mods:
'95 WRX motor
'04 STi 550 injectors
stock EJ20G ECU with my custom Eprom tune
MBC peak @ about 16.2psi (for runs 2 and 3)
3" ebay downpipe + 3" Fujitsubo exhaust
Apexi intake
Ver2 STi TMIC with upgraded feedpipe.

Comments:
- For reference, a stock '07 STi put down about 250 on this dyno, so I am guessing at 265whp, I am at approaching 320chp.
- Difference between runs 1 and 2/3 is that I upped the boost from ~15 to 16.2. I know that doesn't match what the dyno says, but I trust my Defi reading. For run 3, I leaned out the top by about 3%. I also think the AFR readings are off as they are about a full point leaner that what my LM1 reads.
- Yes I have big hole in the middle. I am pretty sure this is due to my overly conservative timing map. It looks like sever knock, but I doubt it since I ran 94 to be safe. Also, with my ecu work, I can log IAM and what I think is the learned fine learned knock correction values and the ECU looks happy.
- My cheap MBC doesn't give steady boost control. It works ok as is, but I will be looking to improve it.

-Rob

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[Matt Monson]

NIce work Rob. Keep it up.

[subartender]

I have a similiar setup.
My car dyno on a dynojet with 260awhp and 230tq at ~15psi.
Mods are:
JDM Version 2 WRX Ej20G with stock TD05
Megan Racing Downpipe
3 inch piping with resonator after downpipe
Stock injectors
Homemade intake(now Apexi intake)
Apexi Power FC
Is the MBC the only hold back for you right now?
What kind of upgraded feedpipe do you have?

[azn0boi04]

i look forward to this everyday...

[rob]

Originally Posted by subartender

I have a similiar setup.
My car dyno on a dynojet with 260awhp and 230tq at ~15psi.
Mods are:
JDM Version 2 WRX Ej20G with stock TD05
Megan Racing Downpipe
3 inch piping with resonator after downpipe
Stock injectors
Homemade intake(now Apexi intake)
Apexi Power FC
Is the MBC the only hold back for you right now?
What kind of upgraded feedpipe do you have?

Not sure what you mean by holding me back. Our numbers are close enough that it's hard to say if it's just differences in the dyno readings.

How much time have you spent tuning your FC?

-Rob

[blkgm8]

Nice dyno numbers for the psi Rob...

Now that you got the car running on the 550cc and have plenty of gas lets get your map sensor upgraded to the ej20k one and turn the boost up a little

[subartender]

Originally Posted by rob

Not sure what you mean by holding me back. Our numbers are close enough that it's hard to say if it's just differences in the dyno readings.

How much time have you spent tuning your FC?

-Rob

I mean is your MBC holding you back since it is not steady? I through you can boost a bit higher with bigger injectors? I was wonder about this since I want to get bigger injectors so I can turn the boost up a little.(like 18-19psi?)

I have no clue on the hours need to be tuned on the powerfc since I got the car that way.

What upgraded feedpipe do you have?

[rob]

Originally Posted by subartender

I mean is your MBC holding you back since it is not steady? I through you can boost a bit higher with bigger injectors? I was wonder about this since I want to get bigger injectors so I can turn the boost up a little.(like 18-19psi?)

I have no clue on the hours need to be tuned on the powerfc since I got the car that way.

What upgraded feedpipe do you have?

Oh I gotcha. Yes, with the bigger injectors I can run 18-19 psi before the MAF maxes out...........then I'll have to work on a Z32 MAF tune <sigh>

I have it set a touch on the low side for now. I will up the boost when I feel a bit more confident with the timing map.

The feedpipe is the the STi sedan version with the cast elbow and silicon coupler. It significantly improves flow.

Out of curiosity, what is does your timing look like between 4200 and 5000 at full boost?

[subartender]

Originally Posted by rob

Oh I gotcha. Yes, with the bigger injectors I can run 18-19 psi before the MAF maxes out...........then I'll have to work on a Z32 MAF tune <sigh>

I have it set a touch on the low side for now. I will up the boost when I feel a bit more confident with the timing map.

The feedpipe is the the STi sedan version with the cast elbow and silicon coupler. It significantly improves flow.

Out of curiosity, what is does your timing look like between 4200 and 5000 at full boost?

I was thinking about the Z32 MAF too but don't know if it fits the Apexi intake.

Do you know where I can find a better feedpipe?

Let me check the timing when I drive tomorrow.

[sniper512]

Awesome Rob. I would imagine 440's at 16psi would net similar numbers hey?

[subartender]

Originally Posted by sniper512

Awesome Rob. I would imagine 440's at 16psi would net similar numbers hey?

yea...my setup is on the stock440's...very close numbers.
But i dont think you want to do 16psi on 440's.
I am maxing out my injectors(aka 100% IDC) when I am at 15psi.
Not safe!

[sniper512]

Hmmmmm that's interesting. Well a little meth will help that.

[rob]

I would say 15-16psi is the limit you want to push the stock injectors (and only after a good cleaning). And yes the power numbers should be the same.

-Rob

[sniper512]

Good good. Can't wait for your tune in my car.

[subartender]

my timing is 47 if that make sense to you(I have no clue what it means haha)

[blkgm8]

Rob... are you able to compensate for ej20k map sensor in your chip tune?

[rob]

I'm not sure, I haven't looked into. Can you email the details on the MAP sensor differences, etc?

Subartender: No, that doesn't tell me anything. There is no way that is your actual BTDC ignition advance. Must be something specific to how the FC does things. Thanks though.

-Rob

[johnny p]

I believe the K has a 1.7 bar resolution,and the G is 1.2 bar.
Nice job Rob. I will take 1 when your done.

[rob]

Do you know where I can find the volt/pressure transfer function for both sensors?

[beaviscih]

Thanks for posting rob, very impressive and gives me an idea what I should see on mine (with the right tuning). My setup is similar except for the injectors and EM (DW650's and Link G4 Plug-n-Play, tuned by MAP respectively), GTSpec headers and TD05H turbo on a '96EJ20G. I've been struggling with the whole IC thing and after seeing your results with the Ver2 STI slanty I may just stop messing around with different IC options and go with my Ver2 slanty. My target is around 240-250 on my tuners dyno (Dynodynamics) where bone stock USDM STis put down around 225whp.

[blkgm8]

Originally Posted by johnny p

I believe the K has a 1.7 bar resolution,and the G is 1.2 bar.
Nice job Rob. I will take 1 when your done.

I believe you are correct... the ej20g map sensor is only good for up to 1.2 bar boost.

The 97/98 ej20k map sensor is good for 1.4 bar.

The 99/00 ej20k map sensor is good for 1.7 bar.


Also the colors of the three wires are a little different when upgrading to the later map sensor. The diagram is as follows
three wires
colors are red (+5) black (GND) and yellow (signal) on the 97+ and earlier car is red (+5) green (GND) and white (Signal)

The map sensor from the k will be off when swapped onto the g... not just a plug and play ordeal and ecu needs to be tuned to compensate.

[JDMFLCL]

rob when can i send my ecu in?

pretty much identical setup but with a front mount.

so when your finally done, itll be in the 17-18 psi range?

[LateGc8]

Hey are your sti injectors top feed or side?

[suberdave]

should be sidefeed...

they fit right into the EJ20G rails with some adapters. i have these ones http://www.fecker.co.uk

-=Suberdave=-
www.suberdave.com

[rob]

Originally Posted by LateGc8

Hey are your sti injectors top feed or side?

Yep, sidefeeds. I used '98 Outback EJ25d rails, so there was no need for adapters.

I just installed my AVCR yesterday and can now see that with the 550s I am peaking at 81% duty cycle at 16.7 psi.

-Rob