thats the problem

i went as far as by pockets could take me

anything around 3-4k should see you with a bullet proof engine capable of running 500bhp all day long.

thats what i did but now im thinking the engine can take the power why not give it to it ie bigger turbo and injectors the fun never stops

thanks let us know which way your going with the build cheers nathan

 

She's on her way up the A40.........(driveway looks so bare )

As for the spec, well it all depends on what David's diagnosis is and his recommendation.

I'm just keeping the Mrs sweet in the mean time A lot of Yes dear.... oh let me do that for you.........and I'll hang the washing out

Gotta do what we gotta do right

 

"I'm just keeping the Mrs sweet in the mean time A lot of Yes dear.... oh let me do that for you.........and I'll hang the washing out

Gotta do what we gotta do right [/QUOTE]


Know the feeling well

 

Fella... that really sucks... sorry to hear it has got pop.

Oil pump failure is the main cause of big end failure that I am aware of.

It has also been argued that poor oil change technique (under filling, not cranking with crank sensor disconnected) can contribute. But doubtful with your car being serviced by API.

Other than that, just plain bad luck I suppose

Good luck - just remember to build her bigger and stronger!

all the best
Ross

 

i read allot about the crank sensor disconnected on these threads and I don’t think its necessary at all -- unless the subaru engine works substantially differently to most other engines

just pre filling the oil filter is good enough, the only time i would crank with the crank sensor disconnected is if it is a brand new build or I have left it over night between draing the oil and filling it back up with new stuff

it takes about 10 mins to change the oil -- not long enough for it to drain from all the journals etc -- i think turning the engine over just means you engine spend more time in the "wear zone" b4 it kicks into life

 

So, it's been mapped outside of it's design intent?

These engines don't let go if not messed about with IMO.

However, I'm sorry it's happened to you

 

You are quite right, of course, ...... churning the engine over on the starter does MUCH more damage than just starting it as EVERY other engine in the world!!

But, you cannot tell some .....

 

Mine did. Absolutely standard MY02 WRX at 75,000 miles

However API's rebuild is still going strong at 100,000 miles

 

It's never happened to me with 10 years ownersip and 5 different Imprezas. But, it was always a constant worry. I haven't got an Impreza right now, and I don't think I'll ever get another, partly because of the engine issue.

 

My car is having it's 1000 mile service at API on Saturday following engine failure. Fortunately I noticed the knocking before it went seriously wrong, still £2400 though.

MY2003 STI PPP with centre decat and remap, with only 43k on the clock and FSSH. The car was always warmed up, cooled down and run on V-Power. I did everyting I could to look after the car but the lesson here is that I don't know how the previous owner looked after it. My advice is buy new if you can, it might well save you in the long run.

You also can't rule out latent defects.

BTW, I can't wait to give it full beans again! Roll on Saturday.

 

with centre decat and remap

I think I have found your problem ......

 

What?...

are you saying that every Scooby that has a full decat and a remap will have a Big End Failure?

 

The flat four engine configuration seems to be more susceptible to poor oil change procedure than a regular upright motor. There is also a problem that the Op relief valve can stick in its guide during an oil change. No telling when or why, it just does it sometimes.

The reason for cranking with the cam or crank sensor disconnected is because the oil pick up pipe is now full of air once the oil is drained and you need to purge that through the system before op is created. AND remember that No 3 big end [ the one that usually fails ] is the last to get fed with oil on a fresh fill basis.

Cranking, with the sensors disconnected is a safeguard, if you do it that way one of the problems is overcome. Leave it connected and you create one. Why not do it the safe way?, it doesn't cost anything..................

David APi

PS; poor old Darms, this failure is gonna cost him a whole pile of shoes [ private joke ]

 

Yes that's what he says and he's wrong.

David

 

il make sure i do it the safe way next time - quite alarming really.

 

David you are so so right this time she's gone one step further and wants a Jimmy Choo bag ........ added a Grand the rebuild already

Exactly what I thought.....

 

I'm not a mechanic but surely with a remap and moderate change to the exhaust this should not lead to engine failure?

I assume you are qualified in this area?

 

Not at all, Pete is a troll and ought to know better by now. Everything he posts is based purely on his own personal experience, ie. he owns one car and it hasn't gone bang. For what it's worth, my own standard MY00 Impreza, UK supplied and with full main dealer service history DID suffer a bottom end failure at 62k miles. I was just driving to work at the time, nothing hard at all. Oil pump failure was indicated.

David at API, on the other hand, is one of the most respected engine builders around, he's the one you should listen to.

Remapped engines, provided they've been done by someone reputable, should actually be the most reliable.

 

yep my totaly standard UK 2000 went at 45K

 

I am saying that if you take the engine outside of the Subaru set-up ... especially if not done by Prodrive .... then you run higher risks of it blowing as it has.

There is a very good reason why Subaru will cover the work done by Prodrive and will not offer any warranty on work done by others .....

 

'One of the problems is overcome' ... any air in the pick-up pipe is not a problem, it's a 'non-issue' IMO.

I've heard this oil pick-up pipe arguement before and in my opinion it doesn't mean that an engine will blow up if the crank sensor is NOT disconnected.

I have now done 10 Oil Changes on my Impreza - I pre-fill the filter, but I do NOT remove the sensor/s! Result? has my engine blown up due to my great big omission? NO!

 

Just seems appropriate to say this again...

 

I own 4 cars and none have gone bang

Thanks all the same.

It's my experience and my opinion that sensor removal is not required, that's all - I am entitled to share my experiences, my engineering knowledge and my opinions without being called a Troll ....... just because my opinions differ from yours.

 

Can you explain why andys and AndyC_772's motors went bang?

Are you saying you've had 4 scoobies? all of which you've kept totally standard (exception of Prodrive approved upgrades) ?

Didn't I hear some P1's going bang in the past (done by prodrive), must have this wrong!

 

Personally ,
i think if its going to happen it will happen,and its happened to me

but im still smiling and my forged subaru is as strong as ever.

Why cant you buy, fully forged,race bearings etc as an optional extra then there would be no problems or less anyway, id go for the option if available from new

cheers nathan

 

Sorry to hear about this Darms. Hope you get it sorted and hope the missus is does'nt give you to much of a beating. Going to service mine on Saturday and i have never heard of the safe way of changing oil before but if everything i have heard about Dave is true then i think i will be doing it as he seems to now his stuff when it comes to impreza engines.

 

Cheers VTR Steve

Have to say David @ API always gets my custom ( despite 200 miles round trip ), yeah she gets pampered and so does the Mrs, its the only way

Only live once and you don't take it with you.......

 

well said darms

 

Sunnysideup sounds like he is related to P S Lewis, he has the same cockeyed ideas. When offered a safe way of doing something, [ that costs nothing but a bit of time ] why play Russian roulette?

You can take a horse to water.....................

David

 

Doesn't Subaru's service manual say the crank sensor should be disconnected? Could of swore it did - I remember the good old days when people on here told us to follow Subaru's instructions when looking after these cars!

Now we have people on one hand saying don't mod your cars it's not what Subaru intended you to do with em and they know best, and on the other hand saying ignore their guidance on the oil change procedure, sometimes you owners know better....what's SN coming to?