exvaux

iTrader: (1)

a bit of advice needed,my car is in a garage right now,engine is in bits and im at the crossroads as to what i do.they can fit a 2.5 for 2200 supplied or rebuild my 2.0 for 1600 (if theres no serious internal damage and block needs rebored etc) .They are a well known subaru expert (only one in this part of the country unfortunately) but some of the advice they have given is confusing .Ive seen 2.5 sti blocks for sale on here and other sites but am being told by them that they are non turbo and wont last,only the jap 2.5 will work and ill need a new ecu to go with it as my 99 spec one is no use

Tidgy

do you know what the block code is?

it depends how far you wanna go, if its a ej275 (is that right code folks?) then you wanna stay below roughly 480ish to stay on the safe side

exvaux

iTrader: (1)

not looking for any more than 400 max and that wont be for a while.Would the 2.5 actually run with the standard ecu but keeping it off boost or are they completely incompatible?

Tidgy

if mapped i thinkyou can (although don't quote me on it) running it without remapping to suit is a very very bad idea, 2.0-2.5 isn't a simple ecu reset, it changes everything in the map.

if its cash your lacking then just save up, not worth risking it

exvaux

iTrader: (1)

its not so much cash lacking,when they are charging more than the dealer for parts supplied i thought id look around at prices myself RCM oil pump is 170 they want 200 plus vat for a standard etc,car is more like a project now the t+t are up,my aim is to have it on road for april ish.The ecu issue is for getting it home or would i be best trailering it

dazdavies

iTrader: (22)

Exvaux,

I would go for the 2.5 and speaking from experience if you drive it sensibly you'll be able to run it in before the remap.

I've just gone from a VF28 fed 2.0L to a rotated GT30R fed 2.5L and not had it mapped yet.

The only thing I have done is upped the fuel pressure slightly on my sx regulator.

Rightly or wrongly I have given the car some proper wellie (1.6 bar to the limiter) and so far its done 2500 miles like this. I have a max reading of 16 on my knock readout on the power FC commander and all temps are fine. I've even checked my plugs and everything was the right colour.

I would say that providing you drive it off boost and never over 4 k you'll be fine.

Run in the 2.5 then take it to be mapped and enjoy the massive torque and response increase on the drive home after the mapping session.

If you want to chat more indepth feel free to pm me mate. I'll gladly pass on my phone number and we can chat on the phone if need be but the 2.5 IS the way forward.

Incedently Iam also selling my Apexi power FC ecu complete with commander that on the car now as I want a Mafless ecu for the Rotated garrett GT30R.


Regards

Daz

SSCJAY

As above,

I went from a 2.0 with tdo4, to a 2.5 rotated garrett GT30 and used the same ECU map, the Map was fine for running in and was o.k on boost upto around 1 Bar (fortunately I have a good wideband sensor so was able to keep an eye on things)

2.5 Just feels so much more responsive and is well worth the money, only thing is with the 2.5 if you are going for 400 bhp, you will have similar torque which will eat your gearbox. I'm on my second gearset as the originals only lasted 200 miles

exvaux

iTrader: (1)

thats another point that confused me,he mentioned the apexi as a replacement ecu and said its ideal as it removes the maf sensor and makes it a map based ecu,which is possible with a mafsim but on its own its still uses the maf to make readings (otherwise you wouldt be selling yours) had a few folk local reccomend this place but im starting to have my suspicions

dazdavies

iTrader: (22)

The Apexi definatly isn't mafless, if it was I'd be keeping it as its been utterly faultless. But I want to run a rotated GT30R at 2bar and through a maf is not the way to do that.

Sounds like their talking rubbish to be honest.

But engine wise you'd be fine to drive it steadily to run it in on the standard ecu without a remap. But you MUST take it steady and not be tempted to nail it when a can of chavs tries to race you during the run in period.

exvaux

iTrader: (1)

i think i will go the 2.5 then,i have an astra as a daily runabout so i can take as much time as i need getting the subaru back on the road then see andy forrest sometime in april about the remap,Cheers

exvaux

iTrader: (1)

block code is 10103AB440.
Does anyoneknow if that is the na or the sti engine code for the 2.5

Tidgy

not got a clue myself but someone will be able to tell you with that info

exvaux

iTrader: (1)

cheers for the pm too

Tidgy

nee probs fella

dazdavies

iTrader: (22)

best way to tell is that the EJ257 which is ideally the one you want. Will be of the semi closed type. It will also have two breathers on the drivers side crank case near where the block bolts to the gearbox.

Both the ej25 and th ej257 will have just ej25 stamped on them.

The two breathers though is the main giveaway.

Based on that code you have the EJ257 semi closed deck block which is the best of the two its the ones used in all the new 2.5 sti's its also the same as the one I have

Daz

exvaux

iTrader: (1)

cheers daz thats the answer i been looking for

exvaux

iTrader: (1)

Daz what type of head gaskets did you use,i think ill just get my car back and do the engine myself,get my mate to fit it,just a few things not making me confident of the folk that have the car just now.How did the 2.0 heads react with the 2.5 block with regards to the compression ratio as ill be using v5 sti heads as well

dazdavies

iTrader: (22)

I am using subaru 1.6mm gaskets. I'm using standard STI version 5 heads that haven't been touched . They haven't been skimmed, havent had the combustion chambers altered and havent been ported and polished.

1.6mm triple layer steel gaskets. I do have ARP studs (12mm) holding the heads down though. I would advise these too. I sourced mine from Paul at Zen for an excellent price, might be worth a call to him.

Gasket thickness was kindly worked out by Matt Clark from Roger Clark Motorsport when I bought my twisted turbo kit from them so I know they are definatly the right size. They keep these in stock.

It makes the compression ratio about 8.5:1 if i remember rightly.

Daz