('03-'05) 4EAT drivetrain losses - Subaru Forester Owners Forum
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post #1 of 10 (permalink) Old 01-28-2013, 11:32 AM Thread Starter
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Join Date: Dec 2010
Location: Edmonton
Posts: 114
Car Year: 2004
Car Model: Forester
Transmission: 4EAT
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4EAT drivetrain losses

So, I'm getting my car built:

- EJ 25 Block is getting built, forged parts
- Tomei 7960 turbo
- Tomei equal length headers
- Tomei up pipe
- Cobb intake
- Koyo radiator
- Cobb catless down pipe, STi cat back

That's pretty much the long and the short of it. At least from the performance standpoint! A previous tune with a VF34 turbo, Cobb downpipe and STi cat back saw 240 whp and 280 wtq on 91.

So, I'm hoping this time around to get 350 whp on 94 instead of 91. Any guesses what I should see? I hear some pretty wildly varying guesses for drivetrain losses on the 4EAT!
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post #2 of 10 (permalink) Old 01-29-2013, 05:40 AM
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stock tranny?

350awhp/tq will be pushing it

2009 FXT LTD - OBP, VF52
2011 Ferd Ranger 4x4
2013 FXT Touring
2008 EZGO RXV
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post #3 of 10 (permalink) Old 01-29-2013, 06:35 AM Thread Starter
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4EAT drivetrain losses

Yeah, it will be. But I'm not launching or anything. Most of the fun will be had at speed. Until my tranny gets built this summer. My main question was whether my goal is attainable with the parts I have going in!
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post #4 of 10 (permalink) Old 01-29-2013, 06:43 AM Thread Starter
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4EAT drivetrain losses

Flow rate on the turbo is about 50 lbs/min as well.
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post #5 of 10 (permalink) Old 01-29-2013, 06:56 AM
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I have a 43 lbs/min turbo, and I have a very conservative 17psi tune, and I'm getting 305 - 310 whp. My tuner thinks on a 19-20 psi tune, I could put down 320whp, so 350 whp should be attainable with a 50 lbs/min turbo.

2005 Obsidian Black Pearl XT w/4eat
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post #6 of 10 (permalink) Old 01-29-2013, 08:07 AM Thread Starter
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Car Year: 2004
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4EAT drivetrain losses

Awesome, I know I'll be satisfied regardless. Got some BC racing coilovers with swift springs, white line sways, STi seats and a few other things going in as well to go with my STi bumper. Updates to follow!
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post #7 of 10 (permalink) Old 01-29-2013, 09:58 AM Thread Starter
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4EAT drivetrain losses

What fuel are you running?
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post #8 of 10 (permalink) Old 01-29-2013, 10:22 AM
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93 Octane

2005 Obsidian Black Pearl XT w/4eat
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post #9 of 10 (permalink) Old 01-29-2013, 08:51 PM
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How much did that turbo run you?

When seconds count cops are just minutes away.
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post #10 of 10 (permalink) Old 01-29-2013, 11:01 PM Thread Starter
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4EAT drivetrain losses

I got it for 1300.00 new!

93 eh? Awesome.
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