Super Unleaded Petrol

[JollyGrnMonster]

very common for big ends to fail after an oil change yes.

The knock from a big end is on many frequencies and the ecu will pick it up and retard the timing.

The usual also on ringland failure on the 2.5 is the first the owner knows if the car is down on power.. usually because the ecu has pulled timing right back and dropped the boost due to the noise.

[JollyGrnMonster]

oil change after oil change google search

https://www.google.co.uk/#hl=de&sclient=psy-ab...

[mrmr96]

ScoobieWRX said:

Even though dealership services and most home DIY oil changes go ahead without disconnecting the crank sensor to prime the oil pump and oil galleries before proper startup,

I've never heard of having to do this. I know a newly built engine needs priming, but why after an oil service?

I would have thought that you drain the sump, so any other places the oil sits would be unaffected. The sump will be refilled by the fresh oil. The only thing I know you need to prime is the new oil filter. But apart from that, why is restart after a service different from any other?

Genuine question.

[Defcon5]

I was just about to post that mrmr96

[JollyGrnMonster]

When you remove the oil filter all the oil drains out the oilways.

If you dont prefill the filter the bearings can run dry. It is well worth prefilling the filter and priming the engine to make sure.

I would also recommend a thicker oil 15w50 if the car is driven hard to help keep oil temp down and the bearing film thicker.

This imho is the main killer of a subaru engine as you get a witness mark on the crank where the bearing touches and it slowly gets worse over time and the oiling to that journel gets worse and then rattle rattle.

[markCSC]

Has anybody tried putting their foot on the throttle before starting the engine? I've "heard" that the car won't start but the oil system will be primed. If so it might be an easier way than disconnecting the crank sensor (I seem to have fat hands).

[JollyGrnMonster]

Yes depending on year but at the risk of an engine I prefer to disconnect crank sensor

[KaraK]

ScoobieWRX said:

Vixpy1 said:

Subaru's do not like BP ultimate!

^^^^^^^^^^^^^^^^^^^^^^^^^^^^
What he said and then some!!

This.. a thousand times this! I've owned three Imprezas and each one has run markedly worse if I've ever had the misfortune to put BP Ultimate in. No idea why - I'm sure its a peculiar combination of the two not getting along but it's definitely the case

[ScoobieWRX]

JollyGrnMonster said:

very common for big ends to fail after an oil change yes.

You're making it out to be a bit of an epedemic when it isn't otherwise this would be very big news and No.1 topic everywhere, which it isn't...Sounds like you're starting your own bandwagon or urban myth here.

JollyGrnMonster said:

The knock from a big end is on many frequencies and the ecu will pick it up and retard the timing.

You must have been getting bored to have come up with this cherry or is it another one of your bandwagon/urban myths.

The knock sensor itself may have quite a wide band but the ECU is very specific and has a narrow band pass filter with sufficiently complex DSP going on to distinguish between knock/Det at one end of the spectrum and banging big ends at the other end. It may be slightly confused by the odd rattling of a heatshield at a similar frequency which is not uncommon but big end knock is another thing altogether.

I remember when in WRX form the bigends in my engine went due to a faulty oil pump, i don't ever remember the ECU pulling timing due to that regardless of the fact i drove it around for two weeks with ends knocking loudly before i swapped the engine out. Never pulled a single degree of timing!!

JollyGrnMonster said:

The usual also on ringland failure on the 2.5 is the first the owner knows if the car is down on power.. usually because the ecu has pulled timing right back and dropped the boost due to the noise.

So if the rignland failure were down to knock in the first place which is common, would the ECU not have pulled timing right back prior to the point of ringland failure? Thereafter the drop in compression reduces the risk of further knock and ECU starts adding more timing again but remain down on power anyway regardless.

I can't say no for sure but does the scraping noise failed rings make really cause the ECU to pull timing. Not sure on this one Simon, not saying definately no but not heard of this one and can't find evidence of it etiher, much like your banging big ends.

You must be running out of things to do on your monster build

[JollyGrnMonster]

ScoobieWRX said:

JollyGrnMonster said:

very common for big ends to fail after an oil change yes.

You're making it out to be a bit of an epedemic when it isn't otherwise this would be very big news and No.1 topic everywhere, which it isn't...Sounds like you're starting your own bandwagon or urban myth here.

JollyGrnMonster said:

The knock from a big end is on many frequencies and the ecu will pick it up and retard the timing.

You must have been getting bored to have come up with this cherry or is it another one of your bandwagon/urban myths.

The knock sensor itself may have quite a wide band but the ECU is very specific and has a narrow band pass filter with sufficiently complex DSP going on to distinguish between knock/Det at one end of the spectrum and banging big ends at the other end. It may be slightly confused by the odd rattling of a heatshield at a similar frequency which is not uncommon but big end knock is another thing altogether.

I remember when in WRX form the bigends in my engine went due to a faulty oil pump, i don't ever remember the ECU pulling timing due to that regardless of the fact i drove it around for two weeks with ends knocking loudly before i swapped the engine out. Never pulled a single degree of timing!!

JollyGrnMonster said:

The usual also on ringland failure on the 2.5 is the first the owner knows if the car is down on power.. usually because the ecu has pulled timing right back and dropped the boost due to the noise.

So if the rignland failure were down to knock in the first place which is common, would the ECU not have pulled timing right back prior to the point of ringland failure? Thereafter the drop in compression reduces the risk of further knock and ECU starts adding more timing again but remain down on power anyway regardless.

I can't say no for sure but does the scraping noise failed rings make really cause the ECU to pull timing. Not sure on this one Simon, not saying definately no but not heard of this one and can't find evidence of it etiher, much like your banging big ends.

You must be running out of things to do on your monster build

your engine didnt fail from oil pump failure if you drove it for two weeks as it would have siezed.

try hitting the knock sensor with a spanner.. thats not the same frequency as knock but the ecu will see it and pull timing.

A 2.5 car turned up for mapping the other month and in my premapping checks I noticed it had a ringland failure.. the compression was not noticably lower on the failed ringland cylinder.. I reset the ecu and brought all the timing back in and listenned on detcans and it didnt det.. but the ecu heard the piece of ringland rattling as did I and pulled timing on the advance multiplier right back to dropping the boost level. Its not a scraping noise.

I have been around subarus a long time, I have never taken anything said or written anywhere as gospel without seeing or hearing it for myself.. I am around several of these cars a day and own 4 of them.

It would seem a small amount of knowledge is a dangerous thing and your definitely dangerous.
You dont seem to realise when you are out of your depth.

Your attitude and response is noted, and wont be forgotten.

Simon

[ScoobieWRX]

JollyGrnMonster said:

A little knowledge is a dangerous thing and your dangerous.

I will take your snide comments and am I bored commets on board and you carry on with your thoughts you spout as the only answer.
I will carry on with backed up responses or my usual opinion stated where so.

Not even going to waste my time responsing to your questions.

Simon

In which case please stop responding to my thread replies because the only parade you're pissing on is your own

Edited to add: My oil pump failure was down to a stuck oil pressure plunger which was righted after the event so i could keep running it for a couple more weeks!!.

Also if you're going to change what you've written make sure you delete the old post before someone replies to it.

Oh yeah, I thought you weren't going to reply to any more of my questions.

Edited by ScoobieWRX on Friday 30th March 17:48

[JollyGrnMonster]

ScoobieWRX said:

In which case please stop responding to my thread replies because the only parade you're pissing on is your own

In your humble opinion which is the main issue here. Its your opinion but your not willing to accept that thats all it is

[ScoobieWRX]

JollyGrnMonster said:

ScoobieWRX said:

In which case please stop responding to my thread replies because the only parade you're pissing on is your own

In your humble opinion which is the main issue here. Its your opinion but your not willing to accept that thats all it is

It is totally just my opinion based on my experiences and i've been in Subaru's for the last 7yrs, mapping for the last 6, however, your opinion isn't the only one, and it is just an opinion, just not always the correct one and this is something which you seem to find hard to accept.

[Vixpy1]

[JollyGrnMonster]

You started freaking out when I didnt agree with you.

ScoobieWRX said:

It is totally just my opinion based on my experiences and i've been in Subaru's for the last 7yrs, mapping for the last 6, however, your opinion isn't the only one, and it is just an opinion, just not always the correct one and this is something which you seem to find hard to accept.

[JollyGrnMonster]

How can you know the pressure relief valve stuck and then unstuck? Thats just ridiculas. Did you have a small camera in there or strip it and unstick it before driving for two weeks?

Not sure why I am wasting my time for sure.

ScoobieWRX said:

In which case please stop responding to my thread replies because the only parade you're pissing on is your own

Edited to add: My oil pump failure was down to a stuck oil pressure plunger which was righted after the event so i could keep running it for a couple more weeks!!.

Also if you're going to change what you've written make sure you delete the old post before someone replies to it.

Oh yeah, I thought you weren't going to reply to any more of my questions.

Edited by ScoobieWRX on Friday 30th March 17:48

[ScoobieWRX]

JollyGrnMonster said:

How can you know the pressure relief valve stuck and then unstuck? Thats just ridiculas. Did you have a small camera in there or strip it and unstick it before driving for two weeks?

Not sure why I am wasting my time for sure.

ScoobieWRX said:

In which case please stop responding to my thread replies because the only parade you're pissing on is your own

Edited to add: My oil pump failure was down to a stuck oil pressure plunger which was righted after the event so i could keep running it for a couple more weeks!!.

Also if you're going to change what you've written make sure you delete the old post before someone replies to it.

Oh yeah, I thought you weren't going to reply to any more of my questions.

Edited by ScoobieWRX on Friday 30th March 17:48

Because i'd already lost oil pressure but was too busy looking at the road ahead and i didn't know anything until I heard the ends go, looked at the dash, oil light was already on and engine temps were already going up. Instinctively i had a good inkling what it was as it wasn't the first time i'd come across this

Knowing this can be remedied temporarily (valve stuck open and often unsticks during the process of pump removal) while still in situ and that's exactly what i did when i got it home. I got my oil pressure back but too late for the motor. The pump wasn't noisy, or leaked or anything else so the first thing that popped into my head was sticky plunger.

You know where you can put your camera, sunshine

[cheesesliceking]

It's topics like this that degrade into a arguments that hinder the people looking for genuine answers.

Sorry guys but any chance you can keep it to email/PM or something?

I'm not being an arse about this but
as a new WRX owner I'm now more confused than before I started to research the frikin oil change.

I'd search on scoobynet but as usual it's full of people spouting wildly different opinions all sure that theirs is the gods own truth.

Rant over..sorry...(ish)

[ScoobieWRX]

I think one thing Simon and i can agree on is doing a proper oil change whether the method everyone else uses causes extra wear or not.

Do your oil change. Prime your filter and screw it in. Disconnect the crank sensor. Turn engine over till the oil light goes out, reconnect crank sensor. Restart the engine and off you go.

Stick to this and you're doing just a little bit more to minimise wear and tear no matter what.

What differences of opinion Simon and I have, right or wrong, (and that's all they are...Opinions) i have no doubt will always exist no matter what. Lots of tuners have differences of opinion and they all think they are right.

There won't be a next time because ultimately it is nothing more than a waste of time and you are absolutely right, it shouldn't happen, and all it does is descend into Scabbynet Syndrome so apologies to everyone for this from my behalf.

Let's move on

[nottyash]

ScoobieWRX Can you remap a 1999 Legacy B4 RSK to 95 RON unleaded? If so how much?