And so you drag it down. What a gift you have

 

Well my opinion (and many other I am sure) is you constantly troll on this forum.
Occasionally with some humor but usually just trying to pi** people off.

 

^^ Did you notice that he lost his original username when infractions were around as he got peppered with em then banned

TX.

 

As some have said,there was no recall for flashing the ecu dealers did it on the first service.

 

Dangerous tactic to assume that none would rag them til serviced.

There are def differences in the maps.

There is no point redlining them anyway IMO - change at 6500 to keep it singing.

 

^^ Agree, why would anyone redline their pride and joy? That's just madness!

 

If the engine is not capable of the rev "limit", then that rev "limit" should be made less.

Why would anyone rarely take their 200+bhp engine beyond 3k rpm, when it is easily capable of over twice that...... that could be classed as madness!

I've redlined mine more times than you have probably took yours beyond 3k and low and behold it has been remapped...... does this mean it is going to let go?

Everyone to their own, hey Pete!

 

If the problem is known by Subaru then why not recall the vehicle for a remap? It must be cheaper in the long run than paying for engine rebuilds and the damage to their reputation. I've got a 2009 car, does this remap apply to them as well. How do you know when the car was made, mine may have sat in a field since 2008! The sti is a performance car, Subaru must know they will be driven hard and with a 3 year extendable to 5 year warranty the failures will come back to bite them in the *rse

 

the chassis no. gives you the year of production so you just have to work out when it was made to when you brought it

 

Yeah, everyone to their own ...... mine is mechanical sympathy ...... the Rev Limiter is there to protect the engine from damage - to slam into it many times, I would suggest is madness. At the very least it is asking for trouble.

 

Doesn't sound like it's doing a very good job of protecting the engine to me! Cutting the fuel is not good when the limiter is there to stop the valves meeting the pistons through valve bounce etc. Have you driven a new sti, they rev quicky which can catch you out! It has me on several occasions!!

 

I would suggest that the redline is not hit at all ...... I have no problem not hitting mine - I cannot see what the problem is, to be honest, with driving with sympathy and a thought for the engine.

 

^^ Don't you run yours on chip fat too fella?

TX.

 

Be good to find out whats actually going wrong. Lots of speculation and many wrong asumptions. At last years sports car show, I was told by a prodrive tech that you can run the hatches safely on 95 ron as they have an anti knock sensor.
Detonation has been round for decades and my memory from two stroke bikes was that it wasn’t caused by weak mixture.
They used to think it was weak mixture, cos that makes it run hot and any carbon in the combustion chamber would glow and cause pre ignition (knocking).
You could wreck a piston in under 50 miles if you got the squish wrong and the cheese holes round the ring land were actually caused by unburned fuel particles (so we were told). These weren’t chocolate pistons.
My 08 hatch has done 9k miles and never missed a beat and never had a reflash. Most of the time I put 95 ron in.
If I,m at sainsburys, I treat it to the good stuff cos its only 3p dearer.
If you boot it from the lights its going to hit the limiter. They rev that quick. You aren’t going to blow holes in pistons in that short a time.
This guys went pop at 85 on the motorway. That’s about 3 and a half thousand revs. Hardly caning it.

 

I have to disagree with your opinion. I can't see any post where SSU has delibrately tried to p!ss someone off. He has stated his own opinion and accepted others of a differing viewpoint. Infact he has been on the receiving end of some vitriol. Whilst I may not fully agree with him or practice what he preaches, a lot of what he says makes sense.

 

There has got to be more to it than just the pistons causing the problem though surley??

I have had lots of uk wrx models, x reg, and 52 plate all running 300 or more and never had issues with the cars and i drive mine hard !!!!

Surely the new 2.5 motor is nt that much different in the build stage from a 2ltr lump, i have spoken to a very good mapper who has taken several new wrx models to high 300 in both bhp and torque with no issues at all, in fact this is my next route to take myself. I know above 400bhp the new engines will go pop !!!! but that is a piston thing yet again ( why did subaru put cast pistons into the sti ??!!!! )


Think ill watch this thread with interest to see what else gets said from other peoples experience


Tony

 

Sorry to hear another one dying...

IMHO,
To increase profits IM spec'd UK cars with "cheap" pistons, the UK classics were nowhere near as tough as the JDM WRX/STI models.
I (luckily !) bought a 2002 STI which does have decent pistons, capable of running up-to 450 bhp without issues.
The 2.5 was built to meet emissions targets, not to be strong and reliable, like the JDM S-GT 2.0 motor....

We just get the wrong engine for this (performance biased) market, IMHO.

dunx

P.S. A decent driver can change up as the limiter is reached, "slamming" into it is for ham-footed muppets....

 

Are you with him re the use of snow to increase BHP?

TX.

 

Dealer has initially tried to tell me its my fault as it has no oil in it LOL!!!
I told him to strip it and stop being silly!!!
I was very angry with this stupid comment!!
Engine will be stripped next week and I will follow up with a resolve.
I do drive it hard every now and again but I can say again it let go with cruise on at 85!!

 

What has IM got to do with the spec of the engine!? They only import them. They don't make them. It's Subaru Japan (FHI) that spec the cars for the marketplace.

 

scoobies are road going rally cars so they should be made to take stick, whats the point of having one if you dont give it the dogs, coming from the other side i think its a joke how many scoobies blow up, i just hope my wagon i`m getting doesnt bloody do the same

 

Road going rally cars my ****!!!!!

 

They de-specc'd classics to make more profit, why fit A/C in Brum when it comes off the line as standard if ordered ?

My classic had 2 pot front callipers, the same year WRX/STI had four pots

dunx

 

IF ordered being the operative word.... those are factory fit options, I wouldn't think that piston type are!

 

But IM ordered them for the UK market ? Other than profit why would you retro-fit A/C here ? When JDM cars had A/C.

Agree to disagree !

dunx

 

But we are on about pistons here mate.

 

(i hope it does sound like I'm picking on you, I'm just using you as quotes sorry

The trouble is, if it was an easy fix, it would be fixed but "Nobody" can give a definatlve answer or it again would be fixed Any way heres my 4 pennies worth

Fact most peeps i know that have modified 2.5ltrs with uprated pistons and "group n" type gaskets have had no issues at very much higher BHP. if you want even more most go down the Semi closed deck route.

comparitively Head gaskets are more of an issue on 2.5ltr than 2.0ltrs

The new hatch ECU is far harder to program correctly than previous versions due to Fly by wire, both inlet & exhaust Variable timing and 3 programs.

Fuel cut is a diabolical way to control rev limit IMHO

Pre -ignition, "Det" or old farts "Pinking"

is as you state "Something" in the engine that "glows" and ignites the Mixture before the Spark plug is due to.
That "something" could be Carbon, plug temprature, Valves, any other metal extremities within the combustion camber, Piston abnormalities,or Oil. poor quality fuel.

Carbon = todays engines run so clean but possible mapping and Fuel swirl issues (see bottom of post)
Plug temp = Subaru specification so should be right ( i do trackdays so go up one temp)
Valves = Subaru specification so should be right
Other metal = Subaru designed so should be right
Piston abnormalities = A manufacturing flaw, A Design Flaw or Application Flaw
Oil Source past piston = Ring failure, Piston Failure or Bore wash,
Oil, Source Valve stem seals = Turbo seal failure, engine now becomes a Oil burner "Diesel"
Oil, Source pre injection = Turbo seal failure, Crankcase oil sucked into engine now becomes a Diesel.
Fuel = STD Uk cars mapped at 95 PPP'd remapped etc 98 ron etc but wihtout "knock link" you'd never know if the Fuel was right or not (as a friend found out but luckily had knocklink) i always use Optimax and octane booster on trackdays as added potection.

Common at high speed and high loads, scooby driver says "best its ever gone" "felt like and extra 50bhp" then suddenly "bang" or "Knocking". Normally the engine become an oil burner "Diesel" and the end is soon nigh.


"Generally" over temperatures within the combustion chamber are caused by a combination of "Timing advanced" and too lean "AFR". if you'd ever played on a Old engine AFR and Timing on a Dyno, you can soon see the the exhaust glow cherry red

New cars mixture and timing are now ultra controllable. And IIRC knock sensors have been fitted to all scoobs since 1999, which Reatrd the ignition timing

Common off the prodution line ECU's on scoobs mixture are set too rich, to run on the side of caution. Hence when they are remmaped with higher performance the MPG is hardly effected.
The "squish" "swirl" of the Air fuel mixture is very important to get the to to mix correctly, but this would be mainly a design issue of the inlet ports, injector nossels and combustion camber. Although possible influenced by the Mapping of the variable Inlet and Exhaust timing.

Overfuelling= common on Subaru STD ECU's

Yes they are not chocolate but there again they are no Stronger with the increased piston radius on the 2.5 and slightly shorten skirt has increased stresses put apon them. As the original 2.0ltr piston designed for 300bhp and could take 450 bhp, perhaps engineers thought there was no need to strenghtening them. if you lenthened a bridge and increasing the weight that goes across it you would to keep in safety margins and not profit margins

The rigidity of the top of the liner on the open deck block, the type of std uk gasket are contributing all factor in the head gasket issues.

most peeps i know that have modified 2.5ltrs with uprated pistons and "group n" type gaskets have no issues at very much higher BHP. if you want even more most BHP they go down the Semi closed/re-inforced deck route.


Does the new ECU monitors the Fuel pressure

everything now is trying to be fuel economical, i wonder if the engine is meant to be cruising/running very lean and then the multi speed fuel pump fails to produce the correct min Pressure. that could cause it to lean the engine out

Some in the USA are on their 2nd engine and still only lowish miles

IMHO IIRC etc

Tony

 

Not all dealers did the reflash at first service. I called my dealer after my service to check they had done it they haddn't. So I took it in to be done (took about an hour as the ecu gets reprogrammed). I was told mine was the first they had done and they just had an advisory note to be done at customers request. I know the dealer sold it's allocation of 12 STI's in 2008 so 11 of them may not have been done!

Even if you have had your first or even second service check the reflash has been done.

 

Exactly why I'd ONLY buy an S-GT if I wanted a hatch, or budget to pull the motor out and fit decent rods/pistons to a UK model.

Stop me now !

dunx

 

Or buy a JDM hatch.