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Old 03-17-2005, 07:30 PM   #1
maxim
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Member#: 53037
Join Date: Jan 2004
Vehicle:
1993 Fake WRX
Grandma Red

Default ej18 ej25 SWAP Dyno Results, HEADS UP!

Before a/f adjustements my car ran LEAN, WAY LEAN! especially from 4k-5k rpm.





run 3: missing (their printer wouldn't work, Ill post it in a few days), but

recorded 130 WHP 137 lb/ft torque. and a very smooth a/f curve never below 12.5 and above 13.5 from 2500 rpm +.

93 impreza LS auto with 2001 manual 4.11 Stage II SOCH 2.5.
Adjustments to a/f were made using HKS afr (awesome product btw)

Hm... lets see. Whoever said 1.8 ecu + 2.5 = rich? Think again.
Detonation at 3500-3800 rpm WOT was almost cured during 3rd run(and I thought it was exhaust rattle, I am lucky I didnt blow my motor running 87 octane). You can actually see Detonation on the dyno results. Hm... time to stop saving money on gas. 1.8's Ignition is quite aggressive, who needs the knock sensor? Thanks Suabru. Anyway, I am happy, I didnt realise I was missing 15 hp on average. Although peak hp was only improved by +5 (it was a little rich at 5500rpm), the car is faster, much much faster. $80 well spent.

To all the people who have done this swap I would recommend 91 octane, AFR/AFC, and a few dyno runs. I only drove this motor for 1500 miles and they were easy "dating" miles. If I drove it like I normally do (4k-6k canyons) my motor would have been out of my car by now and I'd be scratching my head over a bent rod/failed bearing from detonation.
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Last edited by maxim; 03-18-2005 at 02:25 AM. Reason: gotta put some pics
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Old 03-18-2005, 06:41 AM   #2
EcksJay
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Join Date: Dec 2004
Location: Maine
Vehicle:
1997 OBS
'07 KLR 650

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So, did you do the swap yourself? Did you do any other engine mods to it? How long did it take? Hopefully this summer I'll be able to do the same thing....
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Old 03-18-2005, 08:52 AM   #3
xcntrk75
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Join Date: Apr 2004
Chapter/Region: MAIC
Location: NOVA
Vehicle:
2008 FXT Sports 2.5
Dark Grey Metallic

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Sweet swap...

How did the Harbor Freight engine hoist work out
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Old 03-18-2005, 02:45 PM   #4
maxim
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1993 Fake WRX
Grandma Red

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EcksJay this is my original swap post:

http://forums.nasioc.com/forums/showthread.php?t=594740

EcksJay, my suggestion to you is SOCH motor, learn from my failures. Then get an AFC and Dyno the car, otherwise you will probably blow soch too. If you are rebuilding a motor/replacing head gaskets, make sure you GET RID OF ALL CARBON (to prevent detonation), resurface the heads (so headgaskets dont blow again), and get rid of all rough edges in the combustion chamber, i.e. when they resurface heads in machine shop it will have rough edges (to prevent detonation).

I did not get rid of all carbon on this last motor, I got rid of most to save time. I did not get rid of sharp edges. And guess what? Now I get detonation at 3600-3800 rpm at WOT on 87 octane. I am trying to get rid of carbon chemically, and I switched to 91 octane and it seems to be gone, I did this yesterday Ill test again once the carbon is cleaned up a little.
xcntrk75

Harbor Freight hoist is awesome. It takes no space, its foldable, it was $169.99, it can unload engines from freight trucks, its very flexible and very well built. I use a lot of harbor freight tools. For ex, I use their $69 impact gun that IS the same as $400 snap on that my coworker used. I am a very good mechanic (I used to work for the place I dynoed it) and also a future engineer.
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Old 03-18-2005, 03:00 PM   #5
xcntrk75
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Cool thanks...

I was asking cuz I have the exact same one waiting to get used for my swap

Just wanted to make sure I can depend on it...
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Old 03-18-2005, 04:35 PM   #6
Jaxx
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Chapter/Region: NWIC
Location: Boise,Idaho,USA
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The 93 Imp W/EJ20K
flat black

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so your using the stock timing and increasing fuel to prevent knock?
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Old 03-18-2005, 04:45 PM   #7
maxim
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Grandma Red

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well kinda...

but dumping more fuel did not fully cure detonation.
final HKS afr settings, 2001 EJ25, 2001 EJ25 injectors, 93 ej18 ecu:

1250 +17%
1600 +15%
2100 +13%
2500 +13%
3000 +15%
3500 +18%
4000 +18%
4500 +17%
5000 +06%
5500 -03%
6000 0%

As you can see the fuel map is not slightly off, its off, WAY OFF.

Im not giving it a $hit load of fuel, I just gave it the perfect a/f ratio throughout the powerband 2k-6k (12.5-13.5)/1. The knock decreased, but was still present from 3600-3800rpm (exactly at peak torque). So I clean the carbon deposits chemically (whether or not it will do it is a mystery - probably will a little), i.e. fuel additives. At the same time I switch from 87 to 91 octane. Knock is gone.

Sure some kind of timing controller would be better, but not necessary. Im a college kit and this car is complete as of today.

Last edited by maxim; 03-18-2005 at 04:52 PM.
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Old 03-18-2005, 07:28 PM   #8
Hawk296
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Baja

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I replied to your post in the NA forum already... For the recored My engine was 100% free of carbon and all sharp edges on the entire engine were knocked down before it went in. I did get detonation, Dentonation didn't cease until 91 octane, even then it still happened on certain occasions. 93 octane totally cured the problem. I think the cause of the detonation is the slightly higher compression ratio of the SOHC 2.5 over the 1.8 as well as the ignition timing from the 1.8 ecu. This combined with the lack of a knock sensor can result in detonation.

Use the good gas and your car will be happy.
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Old 03-18-2005, 08:22 PM   #9
maxim
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1993 Fake WRX
Grandma Red

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Yeah, you're right hawk. 91 from now on. You should dyno your car man, I mean 15% lean (from my dyno results) is unlikely to be just my car... My car would bogg too if started cold. I think the ecu does something weird on start ups on ej18. So I made a push button start that wires starter relay directly to the battery, so that my ecu doesnt turn on the "start up cycle".
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