hi all

just wanting to know about a engine conversion and rebuilds
its just i have heard a lot of horror stories about engines blowing up.
my engines fine but just wanting to know if the worst ever happens.
i own a classic shape gc8 98 v4 wrx sti

1- i seen online a guy saying you can buy a new 2.5 engine from
subaru for £1200 or there abouts is this true?
and if i was to buy a new 2.5 engine would it fit straight into where
the 2.0 engine was and would every thing from the 2.0 fit back
onto the 2.5 engine (inlet manofold exhaust manifold and everthing else)
also would i need to change or modify anything like the ecu for instance
or would a simtec ecu be compatable.

2- how much would a rebuild on my current wrx sti engine cost?
and what would i get for my money.
i am not wanting things like uprated pistons or anything like that
just starndard parts.
( for instance if say my big end started to knock or something like that)

thank you

 

Iv'e not heard of a 2.5 engine from subaru for £1200, yes the bottom end (block) is a straight swop, all you need to do is fit your heads and away you go, if you have a simtec it will be fine you just need a remap.

if you don't already have a simtec you might want to consider an esl daughter board for your v4 ecu as a cheaper option, and it can have antilag fitted as well.

As for cost thats a bit of a how long is a piece of string question,depends on spec and which pistons and rods, although you won't get much change from £4k for standard sti items, unless you do it yourself, including ecu/remap

Then you need to think about at the very least a clutch as the age/ milage of your car plus the extra torque of the 2.5 will probably see it off in quick succession, best to fit one at the same time and avoid another 2/300 labour later.

If your in the south,Engine tuner do a 2.1 short engine for £2600 ish but fitting is extra i believe, best speak to alan or martin and discuss your options.

And in the north there is scooby clinic, speak to adam and i'm sure they will do you a good deal.

 

thanks ditchmyster

i got talking away today to the mechanic at awd motorsport to find out a little bit more
about an engine 2.5 conversion.
if the middle or end of next year i decided to get a 2.5 block and bottom end
in my car would the 2.0 sti block and bottom end thats currently in my car
be worth anything as there would be nothing wrong with it apart from the rocker
cover gasket leaking a little bit but that dosnt affect the bottom end and
the engine has only done 97000km or in miles 60300miles
because the guy at awd motorsport said if i bought a used 2.5 engine
i could sell the heads of it and use my own heads and i was wondering
if i could do the same with the block and bottom end that would be coming out of
my car and how much could i sell it for?


thank you :-)

 

Your cylinder heads will need the combustion chamber matched with the bore of the cylinders, dont sell your heads have the combustion chamber matched the bore and fit your heads because V3/V4 very good heads with agressive cams.

 

Just a couple of's:
1; The v4 (v3-4) ecu is not compatible with the esl afaik, nor is it cutak'able, it's interceptor ecu or standalone if you change your engine.

2; It's not nececary to match the heads to the cylinder-bore, atleast not for 'moderate' outputs, again afaik, at what output gain outweights price I don't know.

 

Your a little behind the times mate, esl have just cracked the v3/4 ecu's so are available ..

 

Personally i would steer clear of the 2.5 and go 2.1 forged for similar money, some guys are getting 700 bhp using closed deck blocks on 2.1 and a 2.5 maxes out at 550 ish bhp and thats after you have spent close to £20k on the engine build. with a standard 2.5 your pushing it after 400bhp which it's daft not to build for more as you will want it later after you get the bug and will regret not having gone 2.1 even a low ish spec 2.1 will handle 500 bhp no probs.

Don't get me wrong a 2.5 has plenty of grunt because of the torque but it's not the best route if your getting your wallet out to the tune of £5k because no matter how you slice it thats what it WILL cost... before turbo,injectors,fuel system, ecu, brakes, handling, suspension ect.ect the list goes on and on and on and on and on, get the picture

But it's your money spend it how you like and as long as it makes you happy who cares.

 

They can be fitted as is but ideally you want the combustion chamber opened up to match the larger bore of the piston, for maximum power potentia but then its to to the OP.

and yes ESL for V3/V4 is out im having that fitted soon

 

i was interested in the 2.5 because i hear they are more reliable
and i could get a used one and get it fitted by a specialist for the same
price as a rebuild.
i dont realy want big b.h.p power increase's as i dont want to
see the m.p.g drop right down plus i cart about the family in the scoob
so i wouldent want over 300 b.h.p coz i will be too tempted do drop the right foot.
so my main reason to do the conversion would be for reliability
if i was to do the conversion would the reliability be better


cheers

 

2.5l will make a good road car mate im running 1 on my type r.

 

hi blacksti97

how much did the 2.5 conversion cost mate
did the fuel consumtion drop once the 2.5 block was in.
or was the m.p.g roughly the same.

 

2 litre is more reliable than 2.5 and anyone who says different is talking out of hole number 2

2.5 does make a good road car if you like that sort of thing ie a bit v8, i prefer 2l kick in the ***..