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Old 11-14-2009, 03:02 PM   #1
4banger4dr
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Default wrx heads/sti block, current wrx heads ej20g

Some what noob questions here, appologize in advance.Search did not produce what I was looking for, but I do suck at the internet..

First,
my current set up in my '93 JDM wrx converted to obd 2 running /03 wrx wiring and cob access port (stage 2),
koyo oversized aluminum rad, 2 flexlite efans
unorthadox underdrive pulley
silicone turbo intake, silicon y pipe,
usdm wrx top mount, rebuild '03 wrx heads on ej20g block,
cometic head gaskets
'05 sti injectors, secondary throttle body delete,
turbo blanket/cobb heat sheild, tdo4 turbo.
(spools fast get into hard boost around 2500rpm)

I am, certaintly happy with this set up it loves to keep the car side ways on logging roads, and should be quick in rallyx.

BUT, modding is addicting.. I'm not concerned with more boost, 16 psi near 17psi is more then enough for the top end, I'd just like to see boost sooner (without anti lag! its still a dd)

My thought process is rather then redoing the wiring again for an sti swap is,
2.5 long block from an sti, run wrx heads and tdo4 still
*** Questions about this:

-does anyone know of anyone else running a tdo4 turbo on an sti (curious as to the numbers its making)

-head gaskets the same for ej20 and ej25 bottum ends?

-any suggestions are greatly appreciated!
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Last edited by 4banger4dr; 11-14-2009 at 03:09 PM.
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Old 11-14-2009, 03:17 PM   #2
T_Racer69
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I don't think you would want to do that. It already chokes some on a 2.0L, would fall hard on its face on a 2.5. If you want instaspool, I would put the smaller of the factory STi turbos on(not sure on models, still learning so no help there) and do every mod to help spool. Header or PnP manifolds and crosspipe, aftermarket EBCS, PnP intake, PnP TB, TGV deletes, and a tune for it all. These items and mods will help air move more efficiently, helping to spool sooner.

The reason for the smaller STi turbo is to match it fairly close, but get the smallest one which should spool the fastest. But more than anything, boost control and tuning will help dictate how the turbo spools.

Travis
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Old 11-14-2009, 03:42 PM   #3
4banger4dr
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Agreed the tdo4 wheezes out in the top end, but thats why my tranny has gears :P

I'm thinking the extra .5L of displacement would just make the turbo spool that much quicker.
It'd be dyno tuned eventually, and everything but PnP and a header have been done as is.

I guess number one is finding what needs to be swapped, mainly headgasket?
(I'll end up with a 6spd to go along with it.)
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Old 11-14-2009, 04:15 PM   #4
FuJi K
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How is a TD04L spooling slow??? I thought you said HARD BOOST @2500rpms!!!!
Are you running the car hard at 1000-4000rpms or something when you're on these back roads??? What tranny do you have?

You need a more aggressive tune probably. OTS stg2 map isn't fancy. I've seen it, I've felt it, a custom tune is much better, makes the care more LIVELY.
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Old 11-14-2009, 04:23 PM   #5
4banger4dr
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In the first post I said I'm happy with my set up, by no means am I not!
The td04 spools BY NO MEANS slow haha. I've never heard of anyone else doing a tdo4 with a 2.5 the boost on more displacement would yelid more power regardless and the smaller turbo with more exhaust gasses would make it spool more quickly.

Tranny is the stock jdm 5spd, not RA gears or anything fancy.. just the glass box haha

Agreed the stage 2 map is nothing ground breaking, and I would be intrigued to see what a proper one would give me... Thanks for the imput!
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Old 11-14-2009, 04:39 PM   #6
FuJi K
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A properly setup 2.0L drives really well. My friend has a JDM Version6 long block running a '03 WRX ECU/harness merged harness in his '00 2.5RS. The engine is complimented with a JDM V7 non-DCCD 6spd with R180 rear and Brembos. He still runs on the stock JDM Version 6 turbo, which is like in between a TD04L and VF39 tuned on E85. The gearing really makes the 2.0L come alive. Much more preppy. His power mods are really just modded WRX injectors, ebay TMIC, TBE, GM BCS, Walbro FP.

I've driven a stg2 '06 WRX. THAT is your 2.5L TD04L, same with FXT 04-07. It drives like it has no turbo. Peak hp isn't much more, however much more torque peak.
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Old 11-14-2009, 04:55 PM   #7
4banger4dr
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Hmm, thank you that is very informative.

I really do think i'd benefit from a 6spd, for gearing etc.

I suppose at this point if it ain't broke don't fix it... that being said a good tune is next haha.

As for the '06 wrx.. minus the weight diffence with the newer body style i suppose it'd be similar (all i'd be looking for is the extra torque (and faster spool) but if its not huge, there is no reason... Thanks again!
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