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Old 05-16-2013, 11:10 AM   #1
spyrule
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Member#: 222703
Join Date: Sep 2009
Chapter/Region: E. Canada
Location: Ottawa, Canada
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2006 Impreza 2.5i
Crystal Grey

Default STi v9 block with an IPT 4eat ?

Hey guys,

Unfortunately, it seems like I might have an engine that is in the early stages of going (just detected a HG leak).

This is on an 06 2.5i 4eat....

So, I'm gonna drive it 'till it dies. In the meantime, I'm going to start getting the pieces required to swap this engine over to a more powerful turbo'd block.

I'm already aware of some of the common issues I might have, but I'm attempting to stick with a v9 block so that I don't have to convert fly-by-wire to mechanical.

The question I have is this... If i swap over to a stock v9 STi block with all oem turbo, etc... I know my 4eat won't handle more then about 260'ish HP before I have to worry about it coming completely apart.

So, I thinking of sending my transmission to IPT to get them to rebuild the entire thing to handle the increased HP, and then swap the block when my stock engine goes.


Has anybody done this?

Does anybody know if the IPT mods will withstand the HP gains that come with the STi block ?


Any suggestions, conversation is welcome.
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Old 05-17-2013, 01:21 AM   #2
antnygee
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If you dont absolutely love your car, I'd trade your car before before you're sticking a pile of money into it. I'm all for swaps, but sometimes it's better to cut your losses.
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Old 05-17-2013, 06:34 AM   #3
spyrule
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I do absolutely love my car.

Long term, this car will become my dedicated auto-x, etc car. won't be my DD in about a year or so.
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Old 05-17-2013, 12:47 PM   #4
Hondaslayer
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1998 Forester, lifted.

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How much tq does IPT rate their transmission for? STI stg 2 should produce ~ 340lbft at the crank.
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Old 05-17-2013, 03:17 PM   #5
spyrule
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Speaking to john @ ipt, they approximate 5-600hp @ 500ft/lbs torque max, unless there is very specific intentions for the transmission.
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Old 01-09-2014, 03:37 PM   #6
Deedz
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I was originally going to keep my WRX Auto after swapping to a JDM V7 EJ207. It's not worth it even with the IPT transmission. You lose a lot of HP/TQ between the AT & MT, roughly about 60. I was all for the AT at first due to constant turbo spool, that is after the initial lag.

The biggest challenge you'll face is how to make the AT TCU communicate with your ECU.

In my case if I ran the WRX ECU I could get a tune without running the AVCS as the WRX ECU doesn't have tables to support the AVCS logic. Or I could have ran the JDM ECU which does support the AVCS but it doesn't have the tables to support communication with the TCU. Thus you end up having to set up some sort of manual push button shift device which I believe IPT has done before.

Seriously after all my research it's so not worth it especialy when you mentioned autocross. Also, I would have saved quite a bit of money if I just would have bought the whole STi drivetrain as a package initially instead of engine alone and the rest after.

I did run the JDM ECU for about 500km with the EJ207 Swap and the 4EAT. When boost hit in 1st gear I broke all four tires loose on dry pavement (around a corner)
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Old 01-09-2014, 03:44 PM   #7
Deedz
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Java Black

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It's going to be one hell of a job doing what you want here. You'll need a full harness merge being as you aren't a WRX and have none of the turbo components either. Best to find a full front clip.

I also tried looking for a JDM WRX Auto ECU which are hard to come by, but I heard they would work. Makes sense since they support AVCS and the 4EAT.

By the way since you're in Ottawa area there are a ton of JDM recyclers around you. I've dealt with three now and JDMracingmotors was great to deal with.
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Old 01-10-2014, 02:23 AM   #8
acheung
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there are a number of people running high powered subaru's with IPT 4eat's. I am one of them.
Drivetrain loss is relative... and not just an arbitrary value. you can expect about 20-25% drivetrain power loss with the 4eat's. There are a number of things you can do to minimize the loss... personally i like the combination of changing the rear diff and going carbon driveshaft.
Yes, an ipt upgraded 4eat will hold the power of an 2.5 sti longblock. easily. you also will want to consider upgrading your torque converter and valvebody (IPT does both as well). you will also want a tranny cooler.
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