Im pretty sure ive got rod nock:
Its a 2002 jdm bugeye wrx 86k
Its been mapped to 280bhp
Ive spent a fair bit new suspension gearbox etc
Is it worth keeping? What are my options?
How much would the bottom end cost to be rebuilt etc?

 

Diagnosed by who?
Mapped by who?
When?
Any other mods...since?
Before mapping?

 

Just a local mechanic, so maybe not the best, it was mapped by race dynamix few months ago, cambelt was changed before map with all pulleys pumps etc. No other mods since the map

Its a wrx
Sport cat into decat
Walbro pump
Induction kit
Sti intercooler
Thats about it for mods
Its low miles 86k service history is up together

 

Live on an island- sometimes it completely runs out of super unleaded, up to a month at a time last time, anyhow when it was mapped i was always using tesco mem99 then cos of fuel probs last time i had to use 97 from a small garage.
Took on a dual carriage way and when i came off it had a nock which was constant. Hobbled home off boost.
Next day started it up and nock wasnt there until revs held at around 3k have driven again off boost and can be heard when dropping gear or blipping accelerator

 

Can you get a video of the engine when running?
It might be worth just whipping the Cambelt cover off to check tensioner hasn't come loose.

If it is bottom end then you are probably best getting a 2nd hand bottom end and putting your heads etc on that.
Buy from a reputable breaker like Matty on here.

 

Can i get cambelt cover off easy enough? I did wonder if it migjt be tensioner, how can i upload a video to here?

 

upload a video to photobucket or similar site and copy and paste the link here

 

Yes easy to get covers off,you can just take n/s one off and have a feel of the belt,should be enough to tell you if its loose,to get to the tensioner you have to take centre cover off which means removing crank pulley(also pretty easy)

To post a video,upload one to YouTube then add the link to your post.

 

Just out of interest,was it mapped on a Dyno or road mapped? How long was the mapping session?

Btw sorry to hear about this,heartbreak when it happens
Hope is a simple fix mate.

 

Ok mate thank you for your help, il get a vid posted later cheers again, if it is a tensioner or pulley the belt will be loose?

 

It was road mapped in or around half hour, yeh its a killer ive spent alot of time and money and out of the blue something just goes.....im preying a mechanic didnt tighten the bolts when cambelt was changed, and i can go skipping down to the pub,

In my mind tho im already arranging its funeral

 

vid here of rod knock : around the 45 second mark, yours might sound more subtle than this example tho.

 

Induction kit? Hmmmmmm.

And running on 97? Hmmmmmmmmmmmmmmmmmmmmm.

 

As the revs increase the tensioner is designed to increase the tension.
If you can feel excessive movement in the belt the the tensioner may well have come loose.

 

mapped in half an hour?

 

Yes it was

 

Based on the video mine sounds 100% the same

 

not looking good then bud running on 97 ron probably didnt help, should have chucked in some octane booster when the good stuff wasnt available, especially if it happens often.

 

I did put octane booster but it says on back it only raises fuel level by 1.5 so its probably a mixture of things

 

But thank you all for your help i will look at costs of bottom end etc if anyone can point me intouch with someone that would be great

 

Ouch!
Dynamite strikes again!!!

 

Have a look in the trade/breakers forum on here. Give Matty a ring he has a good rep on here

 

Thanks will do

 

But DO get it diagnosed properly before splashing out.