JDM Engines

[FFRSpec72]

So what is the take on JDM engines? I have been looking at a 2.o v7 engine, specs seem right, anyone using one in a "R" version?

[shinn497]

Look up metalmaker's thread.

[metalmaker12]

In stock trim and even with mods the ej207 is the best performing, reliable and balanced Subaru ej engine. I have a version 8 (2004 jdm Sti) with the twin scroll vf37 turbo, it is a high rev (8100-8600) great torque engine that feels very balanced. I am running a 02 subaru wrx harness and it works good

[FFRSpec72]

In stock trim and even with mods the ej207 is the best performing, reliable and balanced Subaru ej engine. I have a version 8 (2004 jdm Sti) with the twin scroll vf37 turbo, it is a high rev (8100-8600) great torque engine that feels very balanced. I am running a 02 subaru wrx harness and it works good

Thanks, and thanks for the clarification on the wire harness, I was going to run a ej207 v7 with a WRX 02 harness, I assume that the downpipe will work on a v7 so can use the FFR setup there. I was going to run a 5sp WRX transmission also which should hook right up w/o any issues.

[JeromeS13]

I assume that the downpipe will work on a v7 so can use the FFR setup there.

The adapter that FFR provides is only compatible with the US spec downpipes. The JDM twin scroll uses a completely different flange and is not compatible.

[metalmaker12]

The adapter that FFR provides is only compatible with the US spec downpipes. The JDM twin scroll uses a completely different flange and is not compatible.

Yea totally different flange on the v8 and v9, but the v7 is standard Usdm wrx. With a v 8 /v9 you will have to make your own exhaust, make sure your engine comes with the jdm bell mouth. Yea Usdm 02 wrx tranny bolts right up. If you have other questions. Like to run avcs you have to mod harness slightly, which I have.

[FFRSpec72]

The adapter that FFR provides is only compatible with the US spec downpipes. The JDM twin scroll uses a completely different flange and is not compatible.

The v7 engine is not twin scroll

[JeromeS13]

The v7 engine is not twin scroll

Touche. I stand corrected.

[metalmaker12]

Yea as mentioned on previous post the v7 did not have a twinscroll and is a standard style flange. I personally like the v8 and v9 because of the twinscroll and very good stock header and up pipe flow. Also they are newer and in better shape. The v7 is great, but there getting older now and you will need to prob rebuild it. Jdm racing motors CAN has a ton of good running engines if you are searching. If you have any questions feel free to pm me

Merry Christmas

[Racebrewer]

Great info........

How about JDM transmissions? Are they the same as the U.S. 5 spds and 6 spds?

Thanks and Happy Holidays ! ! !

I'm on my way to Daytona right now.

[D K]

For what its worth..

Before we decided to go with the FA20, the info i got was that the version 10 engines in the GRB chassis came with 9.x mm liners and some versions (i believe RA) had 13mm liners and were semi closed deck.

For reference, the V 6/7/8 have 7.x mm liners.

D

[FFRSpec72]

Yea as mentioned on previous post the v7 did not have a twinscroll and is a standard style flange. I personally like the v8 and v9 because of the twinscroll and very good stock header and up pipe flow. Also they are newer and in better shape. The v7 is great, but there getting older now and you will need to prob rebuild it. Jdm racing motors CAN has a ton of good running engines if you are searching. If you have any questions feel free to pm me

Merry Christmas

Thanks, I was looking local and also at JDM Racing Motors in Canada but never done any business like buying engine and trans from Canada. Seems like the engine and trans combos are about 4K, I might not rebuild 1st year as I would be just shaking the car out, this is to be my daughters race car. Is there anyone in particular at JDM Racing that is good to deal with?

Also when I asked them about the compression (cold), they indicated about 120psi, I thought they should be in the 150 psi range cold or are these engines not high compression engines ?

[metalmaker12]

120-130 and "consistent" across all 4 is normal cold with plugs in . With wide open throttle plugs In/out warm you will see like 140-160 or so. The way they cold test that's normal, I have dealt with Rob, but I am not sure if he still works with them since I bought my last engine over a year ago. Regardless they all are good to deal with and honor there warranty. I would test the engine/ tranny out as soon as you get it, 9.9 out of 10 your all set, but sometimes they have minor issues like any used engine. I find there motors to be some of the best used engines.

8:2:1 is not a high compression engine in my book lol, some vary slightly but it depends on what exact engine code, there all in this ballpark.

[metalmaker12]

Great info........

How about JDM transmissions? Are they the same as the U.S. 5 spds and 6 spds?

Thanks and Happy Holidays ! ! !

I'm on my way to Daytona right now.

Most are, depends on versions ( years) v6-v9 5spd-6spd yea, if anything the jdms are better across the board.

[FFRSpec72]

I have dealt with Rob, but I am not sure if he still works with them since I bought my last engine over a year ago.

Rob is the one that I'm dealing with now

[metalmaker12]

Rob is the one that I'm dealing with now

Good stuff, hope you get a gem, I have three in a row.

When you get there I can help you with the wiring setup and the little adjustments to get it to run nice nice with an Usdm harness.

[FFRSpec72]

Opinions on the EJ205 with AVCS vs. the EJ207, prices seem to be about 1K less for EJ205 ?

[metalmaker12]

Bad comparison, the ej207 is an Sti engine so it is really apples to oranges. (And if it's a 2.5 wrx it's a ej255). A good comparison is the ej257-ej207.The ej207 has the biggest stock size port to the heads, biggest valves, stronger valve train,the v8 and v9 have way better cranks( the best Sti crank available, just as good as any aftermarket. Also the ej207 due to the stronger valve train etc can get up past 8k stock. It also feels smoother than any 2.5 subie. But the Usdm Sti has the 2.5 displacement which gives you slightly more torque, although with 1,800 pounds you want more hp up top.

If you want a edge on the track with a stock like engine either get a ej207 or build a engine to meet it specs period.

2.0 Usdm wrx: ej205 : cheapest, and less race inspired, but still a good punch for a lite car
2.5 Usdm wrx: ej255: costly for but good power
2.5 Usdm Sti : ej257....Best stock, but cost more than ej207
2.0 jdm Sti : ej207..... Best stock, incredible rev and smooth powerband.

[FFRSpec72]

If you want a edge on the track with a stock like engine either get a ej207 or build a engine to meet it specs period.

OK, so what I hear you say is the EJ207 is worth the extra $$$ and don't pinch and get the EJ205 if I can cough up the extra bucks for the EJ207 (like $1,000 more for EJ207 with 5sp, over a EJ205 with 5sp)

[metalmaker12]

Yeah, but like I said before v7 with 5spds are a bit worn out unless you get a fresh one. The v8-v9 are mated to 6spds stock, but you can get a Usdm wrx 5spd that bolts right up. And also the Usdm ej205 is a 2.0 with no avcs. The Usdm ej255 is a 2.5 with avcs. If you go v7-v9 you can use a Usdm 02 harness, which are cheeper, or Wayne's setup etc.

[FFRSpec72]

Yeah, but like I said before v7 with 5spds are a bit worn out unless you get a fresh one. The v8-v9 are mated to 6spds stock, but you can get a Usdm wrx 5spd that bolts right up. And also the Usdm ej205 is a 2.0 with no avcs. The Usdm ej255 is a 2.5 with avcs. If you go v7-v9 you can use a Usdm 02 harness, which are cheeper, or Wayne's setup etc.

So will a 6sp JDM trans fit in the 818 or do I have to go with the USDM 5sp?

[metalmaker12]

Yes, FFR has the Usdm or any subie 6spd adapter available or it will be soon, call and ask them on its progress. The lockout nut and block off plate are pricy elsewhere for the 6spd but FFR is on it so I am sure they will come up with a cost effective solution. The jdm and usdm 6spds cases are the same. The 6spd is a lot stronger and already has a nice front LSD.

[Canadian818]

Metalmaker, can you direct me to any resource on JDM 6spds? How to know the ratios, etc. Also, some have features like DCCD or other acronyms I know nothing about, can we save money by going with older 6spds without all the awd electronic aids?

[metalmaker12]

This should cover tranny questions :

Impreza 2.2l L models:

Automatic transmission gear ratios:
1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.694
reverse - 2.272
final drive ratio - 4.11

Manual transmission gear ratios:
1st - 3.545
2nd - 1.947
3rd - 1.366
4th - 0.972
5th - 0.780
reverse - 3.333
final drive ratio - 3.90


Impreza 2.5RS models:

Automatic transmission gear ratios:
1st - 3.027
2nd - 1.619
3rd - 1.000
4th - 0.694
reverse - 2.272
final drive ratio - 4.44

Manual transmission gear ratios:
1st - 3.545
2nd - 2.111
3rd - 1.448
4th - 1.088
5th - 0.780
reverse - 3.333
final drive ratio - 4.11


WRX 2.0l models:

Automatic transmission gear ratios:
1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.684
reverse - 2.272
final drive ratio - 4.11

Manual transmission gear ratios:
1st - 3.454
2nd - 1.947
3rd - 1.366
4th - 0.972
5th - 0.738
reverse - 3.333
final drive ratio - 3.90

2004/2005 JDM STi

04 JDM Sti 6 speed:

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.062
6th - 0.842
Final - 3.900

05 JDM Sti 6 speed:

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.062
6th - 0.842
Final - 3.900

2006 JDM WRX STi

06 JDM Sti 6 speed

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.062
6th - 0.842
Final - 3.900

2006/2007 WRX 2.5l models:

Automatic transmission gear ratios:
1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.684
reverse - 2.272
final drive ratio - 3.90

Manual transmission gear ratios:
1st - 3.454
2nd - 1.947
3rd - 1.366
4th - 0.972
5th - 0.738
reverse - 3.333
final drive ratio - 3.70

2008 WRX 2.5l models:

Automatic transmission gear ratios:
1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.684
reverse - 2.272
final drive ratio - 3.90

2008 5speed manual
1st 3.166
2nd 1.882
3rd 1.296
4th 0.972
5th 0.738
final 3.900


2009 WRX 5 speed manual
1st 3.166
2nd 1.882
3rd 1.296
4th 0.972
5th 0.738
final 3.900


2010 WRX 5 speed manual
1st 3.166
2nd 1.882
3rd 1.296
4th 0.972
5th 0.738
final 3.900



Impreza WRX STi models:

2004-2006 manual transmission gear ratios:
1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 0.971
6th - 0.756
reverse - 3.545
final drive ratio - 3.90

2007 manual transmission gear ratios:

1st: 3.636
2nd: 2.235
3rd: 1.521
4th:1.137
5th:0.971
6th: 0.756
reverse - 3.545
final drive ratio - 3.90

2008 STi 6 speed manual
1st 3.636
2nd 2.235
3rd 1.521
4th, 1.137
5th 0.097
6th 0.756
Front final gear ratio: 3.9
Rear final gear ratio: 3.545

2009 STI 6 speed manual
1st 3.636
2nd 2.235
3rd 1.521
4th, 1.137
5th 0.097
6th 0.756
Front final gear ratio: 3.9
Rear final gear ratio: 3.545

2010 STI 6 speed manual
1st 3.636
2nd 2.235
3rd 1.521
4th, 1.137
5th 0.971
6th 0.756
Front final gear ratio: 3.9
Rear final gear ratio: 3.545

2005-2009 Legacy

Legacy2.5i 5spd manual
1st 3.454
2nd 2.062
3rd 1.448
4th 1.088
5th .780
fianl 3.90

Legacy2.5i Automatic
4spd Automatic
1st 2.785
2nd 1.545
3rd 1.
4th .694
final reduction 4.111

Legacy GT Turbo Manual
5spd manual
1st 3.166
2nd 1.882
3rd 1.296
4th .972
5th .738
final reduction 4.111

Legacy GT turbo Auto
5spd auto
1st 3.540
2nd 2.264
3rd 1.471
4th 1.
5th .834
final reduction 3.272

outback 2.5i Manual 5spd
1- 3.454
2- 2.062
3- 1.448
4- 1.088
5- 0.871
final 4.111

Outback 2.5i Automatic 4spd
1- 2.785
2- 1.545
3-1.000
4-0.694
final 4.444

Outback XT Manual 5spd
1- 3.166
2- 1.882
3- 1.296
4- 0.972
5- 0.738
final 4.444

Outback XT Automatic 5spd
1- 3.540
2- 2.264
3- 1.471
4- 1.000
5- 0.834
final 3.583


Outback 3.0R/VDC/LL Bean

Automatic transmission gear ratios:
1st - 3.540
2nd - 2.264
3rd - 1.471
4th - 1.000
5th - 0.834
reverse - 2.370
final drive ratio - 3.583

2007 Legacy 2.5GT Spec.B

6-speed Manual transmission gear ratios:
1st - 3.636
2nd - 2.235
3rd - 1.521
4th - 1.137
5th - 0.891
6th - 0.707
reverse - ???
final drive ratio -3.90

B-9 Tribeca

Automatic transmission gear ratios:
1st - 3.84
2nd - 2.35
3rd - 1.53
4th - 1.00
5th - 0.84
reverse - 2.77
final drive ratio - 3.58

Forester Models
2.5L non turbo manual trans has 4.11:1 final drive
Non-turbo AT and Turbo manual and AT all have 4.44:1 final drive.

2.5 Non Turbo 5 Manual
1st 3.454
2nd 2.062
3rd 1.448
4th 1.088
5th 0.780
Reverse 3.333
Transfer 1.000
Final 4.111

2.5 Non Turbo 4 Auto
1st 3.027
2nd 1.619
3rd 1.000
4th 0.694
Reverse 2.272
Transfer (none)
Final 4.444

2.5 XT Turbo 5 Manual
1st 3.454
2nd 1.947
3rd 1.366
4th 0.972
5th 0.738
Reverse 3.333
Transfer 1.000
Final 4.444

2.5 XT Turbo 4 Auto
1st 2.785
2nd 1.545
3rd 1.000
4th 0.694
Reverse 2.272
Transfer (none)
Final 4.444



5speed transmission
PPG gearset
3.18 / 1.87 / 1.32 / 0.95 / OEM - Synchro 1st-4th Helical Cut Gear Set
3.08 / 1.87 / 1.32 / 0.95 / OEM - Synchro 1st-4th Straight Cut Gear Set
3.08 / 2.15 / 1.50 / 1.05 / OEM - Synchro 1st-4th Helical Cut Gear Set from Andrewtech
3.18 / 1.87 / 1.32 / 0.95 / OEM - Dogbox 1st-4th Straight Cut Gear Set
3.08 / 2.15 / 1.50 / 1.05 / OEM - Dogbox 1st-4th Helical Cut Gear Set

MFactory
3.454 / 1.940 / 1.350 / 0.958 / 0.769 - MFactory PRO Series Gear Set

6speed transmission
Subaru
PPG
3.080 / 1.880 / 1.350 / 0.960 / OEM / OEM - Drag 4 Gear Subaru 5MT Dog Gear Kit

Legacy GT gears swapped into WRX
Subaru
3.166 / 1.882 / 1.296 / 0.972 / 0.738 - USDM '05+ Legacy 2.5GT & JDM models
3.083 / 2.062 / 1.545 / 1.151 / 0.825 or OEM - JDM GC8 WRX/STi RA Version 3-6


02 JDM WRX
1st - 3.166
2nd - 1.882
3rd - 1.296
4th - 0.972
5th - 0.738
reverse - 3.333
Final drive ratio - 4.444

[D K]

Opinions on the EJ205 with AVCS vs. the EJ207, prices seem to be about 1K less for EJ205 ?


The big difference here is that the 205 is an open deck and the 207 is semi open.

[metalmaker12]

Yeah it is the major block difference, but at stock hp or slightly over levels not really a concern.

[FFRSpec72]

The big difference here is that the 205 is an open deck and the 207 is semi open.

So the added strength/support for cyl walls, which costs more to make

[metalmaker12]

For them it was not much about cost, more for strength in the more performance mill

[D K]

So the added strength/support for cyl walls, which costs more to make

Having the tops of the liners secure helps with higher rpm's as well as being more rigid

The liners are much thicker as well.

The 207 is a semi closed deck like the 257 and the V10 and newer are 3/4 closed (I think thats what Subaru calls it) deck with even thicker liners than the 207.

D

[metalmaker12]

Yea they are getting better, hopefully all the components hold up also.

[FFRSpec72]

Do the USDM transmissions use electronic speedos or mechanical speedos? as it seems the JDMs use both

[JeromeS13]

Do the USDM transmissions use electronic speedos or mechanical speedos? as it seems the JDMs use both

To my knowledge, 2007 and older use mechanical gears to calculate speed. On the 2008+, they use the ABS/wheel speed sensor for wheel speed.

[FFRSpec72]

To my knowledge, 2007 and older use mechanical gears to calculate speed. On the 2008+, they use the ABS/wheel speed sensor for wheel speed.

So do I assume that the best choice id the mechanical speedo transmission since the gauge pods must be mechanical also ?

[FFRSpec72]

Are the JDM EJ207 v7 engines drive by cable? I assume this is the same for like the 2005 USDM Sti versions also ?

[JeromeS13]

My fault for the ambiguity. Only the sensor is driven via mechanical means. The sensor then converts that mechanical motion into an electrical signal. The needle itself on the gauge cluster is purely electronic.

[FFRSpec72]

I assume the JDM EJ207 engine would fall under option "80515 - 2002-2004 Turbocharged (No Charge)" for order purpose?

[FFRSpec72]

So it looks like I have to either get an IA Performance Subaru AVCS Bulkhead Wiring Kit (http://www.iaperformance.com/product_info.php?products_id=2580) or figure out how to do this myself as current plan is to use the USDM '02 WRX harness and JDM ECU as going with a stand-alone would cost me 2K or more.