XR8, I'd have bitten your hand off in the 80's. 250 made.





Apologies for thread deviation, but it is a Hatch at least!

 

still a few of them around here as well as the Piranhas.

 

My Forester STI is only firing on 3 Cylinders.

It is now in to see why?

My last Forester Turbo (2 litre) did nearly 150,000 miles before any problems.

This has just done 70k. And surprise surprise, 2.5 litre engine.

Will keep you posted.

ATVB.



Alan MaC

 

Is it a stock engine or is it modified?

 

Stock engine with a remap, it is a closed deck engine.

Thats where all the problems arose as I understand it?

In this Friday to check out my options.

ATVB.


AM

 

What's "where the problem arose" - certainly not the stronger closed deck block?

Remap - if not done properly / by a respected Subaru mapper then perhaps... depends on symptoms / failure mode!

 

Can I just say my 2010 wrx sti with 20k miles a track day under its belt and modded to 340bhp has been impeccable and has not skipped a beat. Reading some of these posts however does worry me.

 

What mods have you completed for 340bhp and has it been mapped ?

 

Hks racing suction induction kit and ecutek remap courtesy of jolly green monster

 

With the ecutek map i would say you have reduced the risk quite a lot. Hope it continues to tick all the boxes for you.

 

I'm being told the closed deck is the problem, the open deck not so.

This baby has been looked after very well, servicing bang on, oil cange, engine flushes the lot.

Motorway crusing mainly.

It was remapped by a VERY respected Mapper,that is not the issue.
The issue is Subaru have a weak engine.

I will update you tomorrow.

ATVB.


Alan MaC

 

Alan, the 2.5 isn't produced as a closed deck option only the standard semi-closed. (and the FSTi is an EJ255 not an EJ257)

Hope all goes well tomorrow.

 

As Don says, all the best for Friday.

My bet is on head gaskets.

 

not on a missfire might be something simple you never know,
I've seen instances with heavy corrosion on the connector on the coilpacks before today. EJ255 arnt usually any trouble

 

Cheers Boys,

Today i had a master classs presentation on Subaru Egines by Foresters Subaru in the West Midlands.

I got it the wrong way round!

They showed a closed block & how it is the short block of choice, themn the open block which was pants & then the semi closed block that tried to dig them out of the Pooh, I now understand after seeing them in the flesh and, having it explained to me.

No 3 Piston has cracked.

I have 3options.

1) Repair & make good no 3 piston.

2) Rebuild the semi closed block 2.5.

3) A new Small Block, which is completely Closed with oil jets.
Forged Wiseco pistons, centre mounted bearings on main thrust. Uprated oil pump & STI Forged Rods. Work with big block end & make good.

So I have gone for option 3, I canyt afford it, however, this STI is my pride & joy, I have NEVER scrimped on anything on this beauty.

Only the best for it.

I have given to go ahead to start & all being well pick it up next Friday afternoon, I 'll keep you posted.

ATVB.


Alan MaC

 

As Julia Roberts, in Notting Hill, mused... "Good decision. Good decision."

 

Why is that buddy? Is it like a bug fix for a computer programme? I genuinely dont know. Thought it just remappex fuel and air

 

Cheers,

It is a 2 litre Short block, they are boring it out to 2.1 Litre, so i'M told it is a strong engine.

I had JGM map it originally, and was mid 300's, I'm told with this, it should be high end 300's?

Cheers.

ATVB>

AM

 

Alan,

Probably make it 2.1 with a longer stoke by changing crankshaft with suitable rods?

 

dabiscuit,

ECU controlls all sorts of things including air / fuel, ignition timing, injector duty, knock ( det ) detection and control, cold start, boost pressure control, and more.

The re-map changes some settings, usually the fuel injectors timing and how much to squirt in & when, for the air it's getting, and ignition timing, and knock levels, boost allowed, etc.

Some safe things like cut off if too high rev limit and to retard ignition if too much knock, as well as spot errors in sensor and operations and limp home safety mode.


ECUTek remap ( ot others ) optimises these things for your actual car with your actual parts, modifications and changes, and if there were any problems with the OEM map then they would be fixed, which is why MickP said a remap would be safer.
The initial Subaru map seemed a bit poor at the top end when you may hit rev limit and cause damage.

 

I thought your original engine was a 2.5 ?? So are you using the cylinder heads off that engine on your 2.1 as that's not gonna work. As I understand 2.35 is the minimum for 2.5 heads to fit too ??

 

Ones 99.5 mm bore, other is 92 mm bore, I think.

 

Thanks buddy for the concise answer. I understand getting a new de-cat down pipe could add another 30bhp without a remap. Is this true or would I still need another remap? I don't think I can justify another one.

 

Little changes like downpipes, air filter or cat back exhaust don't often need remaps.

Anything more significant - turbo, injectors, or other things that change the air / fuel into the engine really do require mapping in for safety and to get the benefit.


If in doubt ask on here or other forums, or ask your local mapper/tuner for advice.

Your mapper, if you already had them map it, would most likely do a tweak on your map to accommodate the changed parts for a small fee not the full whack!

 

Would require a tweak to the map.......... and not good come MOT time

 

due to the decrease in exhaust backpressure you'd be susceptible to boost spikes which are a big no no. always remap for decat on a newage

 

Not sure, the boys at Foresters are sorting it.


ATVB.



AM

 

May be worth asking the Question mate, Otherwise it's just not gonna work properly

 

We wouldn't be suggesting 2.5 heads on a 2.1.

 

Could a 2.5 engine be re-sleeved to a 2.35 keeping its standard heads. If it were pinned or close deck inserts installed would it be as strong as the strokered ej22 and would this be cheaper or more expensive, or are there many other factors to it?