just fitted my ej257 with a set of sti3 heads i have set the max rev to 3000 for running in but the knock is hitting between 20 and 30 on the hand commander just running in is this normal with the 2.5 engine?
there does seem to be a slightly noisy tapped.

cheers david

 

Just in general tech terms that seems Bad News to me.
Suggest you get it soeted properly fast, ie remapped or generally checked by someone who knows
Graham.

 

What thickness head gaskets did you use?

David APi Engines / Api Impreza
www.apiengines.com

 

Andyf is the guy nearest to you for mapping

 

used 1.6 mm gaskets

 

Are you using different pistons?

 

no its standard block with standard pistons

 

Sounds like the wrong gaskets for STi3 heads, AFAIK the hace a different squish volume to your old WRX heads.

Best you speak to Mark at Lateral of get Andy's help PRONTO!!!!!!!!!!!!!!!!!!!

Russell

 

I can't remember the gaskets I used for my 2.5 with STI3 heads, but the subaru PN is 11044AA610

APIDavid might be able to tell what they are

I take it your using a Link ECU. Have you mapped for the 2.5 or just running the 2 litre map?

Did you check the shimming of the heads before assembly?

 

I have the same basic engine, ej257/ver3 sti heads and used the 1.6mm gaskets and have no problems.
If you are using a map based ecu like the link i can see a big problem with out having a remap. If it was a powerfc or the factory ecu its not as drastic as it knows how much air the engine is using with the maf.

 

got the headgaskets from mark at lateral and the the ecu is a power fc

 

1.6 mm gaskets for that are fine, exactly what we would have supplied. I was just checking that the pistons weren't hitting the heads. They won't on that configuration.

UNLESS by mistake you have 2.0 gaskets - unlikely from a professional like Mark. but it is possible to make a mistake.........

Best to let a professional hear it to save time.

David APi Engines / APi Impreza
www.apiengines.com

 

Definately supplied the thicker gaskets, but even if the thinner gaskets had been fitted, the pistons wouldn't hit the heads.

Try, and borrow some det' cans, to identify if it's det', or mechanical noise.

Is it noisy all the time, or only under certain conditions ?

Try pulling out 5 degrees to see if it helps, if not, it's more likely to be mechanical.

One last thing to check, is the knock sensor. It's not uncommon for them to have an issue, and show more noise than exists !!!


Mark.

 

tried retarding the timming no difference at all seems to be picking it all the time its ok at idle but as soon as you lift the revs up it goes

cheers david

 

That's the ones !! 1.6 mm EJ25 type - steel laminate.

Well done Dyney.

David APi Engines / APi Impreza

 

Det cans to confirm its not a knocklink fault, then its a stripdown otherwise.

Does depressing the clutch make any difference?

Does it sparkle when stationary?

 

ahh, just seen its knock count from the power fc. Still need to listen with det cans and confirm not a dodgy knock sensor.

Where do you have the sensor mounted? OEM position or elsewhere?

Steven

 

knock sensor is standard position,not noticed any difference pressing the cluch and whats ment by sparkle when stationary?

cheers david

 

hey russell any chance you can get your det cans out mate?


cheers david

 

David, i was refering to the christmas tree effect of the knocklink, but from your posts you dont mention that you have one, you just refer to the count from the PFC.

With the car stationery, does the knock count increment in the same way, as it does when driving?

Det cans needed

 

Only once I get back from India (2 weeks).

Sorry

Russell

 

yes it just goes up with the revs

 

just been in past wallace performance seems to think that it is the noisy tappet he said its not det

 

so does a tappet noise get picked up by the knock sensor?


cheers david

 

The tappet, if loud enough, could well get picked up by the knock sensor which is afterall just a microphone.

Sounds more like noise than det. Monitor the knock count with the graphing option on the PFC, det would show as a sudden spike rather than a gradual rise as the revs increase.

 

yeh seems to be engine noise just have to work out what it is but the tappit is really noisey
can the tappets be checked an reshimed in place or does the engine need to come out AGAIN i did get them checked when i got the heads skimmed

cheers david

 

shim out of place on heads.

 

so can this be sorted out in place or have i got to take the engine out again

 

I can be sorted in place although can be awkward, but easier than pulling the engine out!!

 

ok checked the valve clearences today the noisy one is 13 thou on an exhaust valve so i take thats not enough to give the knock count of 32 then any other sugestions?

cheers david