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Old 10-14-2006, 04:05 PM   #1
tonzo
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Subaru Stars 4eat modifications

Ok I am looking at around 500 hp and i would like to go with an automatic tranny. I was wondering what the cheapest possible way (under 800 bucks if possible) to modify our automatic trannies for such applications would be. Aside from torque converter that is.
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Old 10-15-2006, 12:10 AM   #2
jabbott
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At $800 your not even close! Even with a valve body upgrade which is like $500 your gonna kill the clutches if not break a hard part.
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Old 10-15-2006, 12:49 AM   #3
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For 500 hp you really need to think about a fully built 4EAT. Importperformancetransmissions.com are the folks to talk to in my experience, though others (ESX?) have offered custom built trannies as well. The IPT tranny is $3,750 (excluding high stall converter, you'll need that too), and you should think about the differential strain you will be experiencing as well.

So... doable? Easily. But not for $800. At least not if you want reliability/longevity out of the transmission.

The good news is this: the $$$ required for modifying a 4EAT to handle 500 hp is (most likely) less than what a 5MT would require.
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Old 10-15-2006, 01:19 PM   #4
tonzo
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yea i figured those would be the answers i would get. i just find it sad that ill be able to do my entire build for 3k but a tranny to run it at full throttle will run me more than that. oh well. Does anyone know if they make adapter plates for our engines to run other brand transmissions?
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Old 10-15-2006, 09:50 PM   #5
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anyone?
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Old 10-15-2006, 10:06 PM   #6
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Your gonna make 500 hp for $3000 and be reliable??

As for the adaptor plate, as far as I know there is none. There are people running 8's on a 4eat.
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Old 10-15-2006, 11:51 PM   #7
tonzo
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Quote:
Originally Posted by jabbott View Post
Your gonna make 500 hp for $3000 and be reliable??
and how is that so hard to believe?
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Old 10-16-2006, 10:19 AM   #8
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Quote:
Originally Posted by tonzo View Post
and how is that so hard to believe?
Well, im there and have over $5k into my trany including the IPT magic, modena front diff, DSS axels...etc. Still breaking output shafts.
If you dont push a 500awhp car hard all the time (its still fast only pushing 24psi!) it will be somewhat reliable and drives 'ok', but shifting, trany noise and some mild virbrations and unknown noise's are status quo now.
Its NOT cheap, and the trany is just an important as the powerplant, so expect to spend as much on the trany as on the engine. Seriosly.
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Old 10-16-2006, 10:36 AM   #9
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I just find it kinda sad that's all. I know if i want a bullet proof subaru tranny then you end up spending that much BUT I also know that my engine will be reliable even though im not spending much over 3k (I never said anything about the drivetrain....I'll definitely be throttling it back for a while). Kinda wish subaru would just build one themselves.
A good tranny for a lot of the other cars ive seen ran about 1300 for something that could handle 500+ horse. oh well, back to the drawing board
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Old 10-16-2006, 10:40 AM   #10
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Please explain how your gonna build a 500 awhp engine/turbo setup for $3000. That will last more than a couple of months.
I'm not trying to be an ass, I just don't see how it's possible.
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Old 10-16-2006, 10:52 AM   #11
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Quote:
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Please explain how your gonna build a 500 awhp engine/turbo setup for $3000. That will last more than a couple of months.
I'm not trying to be an ass, I just don't see how it's possible.
2.5 stock block with an 18G dynod at I-speed/crawford JK. im not a crawford basher.

Even a 2.5 with any kind of garret gt series turbo is gona be about $5k when finaly done. Believe me, unless you do it and have alot of new parts laying around, there's alot of stuff to get together ($$).
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Old 10-16-2006, 10:53 AM   #12
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Well part of it is the fact that i already have a lot of the parts i need from my current block- throtte body, intake manifold, etc. The other facts are that I'm in the process of getting my engineering degree and I know how to weld and do 90% of the work myself. You save a lot when you're not spending 1000 bucks just on an exhaust lol. There are ways to do it. Just do a little research into parts and services and you'll find that the subaru aftermarket dealers aren't the only ones with experience. As for my official build, I wont start posting about it til I have all the parts ready to go in.
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Old 10-16-2006, 11:09 AM   #13
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An sti shortblock with forged pistons is about $2000. That leaves you with about $1000 for:

Turbo setup
Heads (and maybe cams)
An entire fuel system (stock in tank pump system is gonna be at it's max at 500)
Gaskets
And I'm still leaving out alot of stuff!
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Old 10-16-2006, 11:13 AM   #14
tonzo
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who said i was using an sti block?
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Old 10-16-2006, 11:27 AM   #15
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Quote:
Originally Posted by tonzo View Post
A good tranny for a lot of the other cars ive seen ran about 1300 for something that could handle 500+ horse.
Maybe rwd, but how many of those $1300 trannies were AWD with variable torque distribution and a 45/55 front/rear torque bias?
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Old 10-16-2006, 11:34 AM   #16
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Quote:
Originally Posted by scooterforever View Post
Maybe rwd, but how many of those $1300 trannies were AWD with variable torque distribution and a 45/55 front/rear torque bias?
oooow, I love trick questions

IPT mentioned to me as early as last week, Its amazing what parts for these cars cost and how much it costs to build a great trany, when you could buy a gm or ford trany on JEGS for $1500-$2500 that will handle anything. Of course our trany is much more sofisticated and not much R&D, but its getting better i hope cause im about to buy a vett if it breaks again
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Old 10-16-2006, 11:44 AM   #17
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I've spent 1600 bucks twice on a 700R4 just to get my truck(~220hp) running when I needed it. I think asking to spend 1/2 of that on an AWD tyranny, is out there.
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