Need Help Rb25det Problem!

[l0WRB]

hey guys well cut a long story short just wondering if anyone has had the same problem as me or could lead me in the right direction as to wot im looking 4.

cooler

exhaust/dump

slide stage3 hiflow

stock ecu

walbro pump

2 days ago i was heading home brought the car on boost in 2nd think it spiked to 16ish psi

once i had pulled up at home the car suonded like it was miss firing on idle(which it was after gettin out of the car) now the motor has a fair bit of blow by..if i pull catch can hoses off the rocker cover the after a bit of a floggin the car is fairly smoking/breathing,catch can is vented to atmosphere! ive done a compression test and results are

cyc1 145

cyc2 148

cyc3 100

cyc4 150

cyc5 145

cyc6 147

but yeh ive changed the plugs and no change in the miss fire(car doesnt miss fire,still comes on boost hard thru the rev range) but does NOT sound healthy down low/idle... i was thinkin maybe head gasket? but there is no oil in water or water in oil so yeah. also usually every 2-3weeks im emptying my catch can with a good 100ml+ of oil in it...basically this coming friday(2morrow) we were going 2 pull motor out,rip the head off and check everything out. if anyone has had similar experiences could they shed some light or maybe someone who has an idea what i could be lookin 4 in the bottom end that could be shagged.

thanx

Justin

Edited February 23, 2007 by l0WRB

[The Mafia]

High flow and stock ecu = bad.

Spiked to 16psi, you got detonation, and killed number 3's ringlands. (Compression test shows that.

Engine rebuild time.

[BHDave]

Yep, you've pinged it to death and as mafia has stated, it's probably a ring land in number 3.

The headgasket and studs are good for a lot more than 16psi so i doubt it's at fault.

[l0WRB]

thanx guys well out come the pistons then and check them all over! oh joy this weekend is gona be fun (NOT) haha the link ecu and fuel reg just arrived today, now my motor is f*ked there goes my tune money:|

Edited February 21, 2007 by l0WRB

[The Mafia]

get a set of forged pistons, and there is a user "roguepi" on ebay that sells good rods for RB25, RB26, and RB30.

Get a set, some big end bearings (ACL) and a new head gasket. There will be a few other things you need and I am sure the rest of SAU will help.

[l0WRB]

im kinda on a budget at the moment,not really interested in forged pistons and rods and all that other kind of stuff, it is my daily driver and im trying to find the cheapest way out of this..has anyone got contacts for supplier of rings/bearings/pistons etc if i need any of these parts, genuine nissan will charge arm and a leg. do i really need forged pistons and shot peen rods for 300rwhp? as a daily driver on 14psi?

[tmc_2]

im kinda on a budget at the moment,not really interested in forged pistons and rods and all that other kind of stuff, it is my daily driver and im trying to find the cheapest way out of this..has anyone got contacts for supplier of rings/bearings/pistons etc if i need any of these parts, genuine nissan will charge arm and a leg. do i really need forged pistons and shot peen rods for 300rwhp? as a daily driver on 14psi?

If u jsut got forged pistons they shouldnt be much more expensive than stock? foged pistons can be had for under 1k i think.

Hope you sort it out easy enough mate

[whiter31gxe]

Strapped for money? Buy a laser for 1k, then with the fuel savings build a beast......

[R31Nismoid]

You wont get out of this cheaply... its going to be 4 figures even if you do it yourself by the time you buy new bearings, machine it all up etc etc.

And if your doing it yourself your gonna be without a car for quite a while.

Guess thats lesson learnt the hard way.

Should never be running with a stock ECU/Hi-flow and increased boost. Its always going to end sadly

[l0WRB]

You wont get out of this cheaply... its going to be 4 figures even if you do it yourself by the time you buy new bearings, machine it all up etc etc.

And if your doing it yourself your gonna be without a car for quite a while.

Guess thats lesson learnt the hard way.

Should never be running with a stock ECU/Hi-flow and increased boost. Its always going to end sadly

yeah if i can get out of it for 1k im a happy man and yes im assuming it is going to take my car off the road for atleast 2-4weeks but luckily work at a car yard and i can borrow a drive around car hehe im actually lookin forward 2 pullin motor out atleast now i can clean my engine bay and paint stuff that i couldnt cause i didnt want to take it off the road for more then 24hrs haha this time car comes back on the road with link ecu and a tune

[l0WRB]

Just a quick update

started on it yesterday afternoon,by around 9 last nite we had the motor out and the manifolds off and the head off, this is where the fun begins lol..from what we could see it all looked fine 2 me(i dont know shit really bout cars haha) all cyclinders still have hooning marks still in them,but anyway piston 3 looked to have a few burn marks at the top of the cyclinder so cant wait to check out the piston once we pull them out..1 quick question if anyone has done this before..when the piston is at its full stroke sitting at the top of the block is it normal for about 1mm clearance movement side 2 side?

just a few pics below guys, sorry bout quality was on my phone

[extreme turbo manifolds]

Just a quick update

started on it yesterday afternoon,by around 9 last nite we had the motor out and the manifolds off and the head off, this is where the fun begins lol..from what we could see it all looked fine 2 me(i dont know shit really bout cars haha) all cyclinders still have hooning marks still in them,but anyway piston 3 looked to have a few burn marks at the top of the cyclinder so cant wait to check out the piston once we pull them out..1 quick question if anyone has done this before..when the piston is at its full stroke sitting at the top of the block is it normal for about 1mm clearance movement side 2 side?

just a few pics below guys, sorry bout quality was on my phone

yes you wil have movement from side to side.

remember metal expands when hot so clearances are setup to be right at running temp.

thats why flogging your engine when its cold wears it out fast cause the pistons are slapping around in the bore and results in cylinder wear and piston skirt wear

[Spook's_Skyline]

who let you install an upgrade on your turbo with the stock ecu?

[MANWHORE]

Why would low rb need someone to give him permission to install a turbo?

[Strik3r]

cause it might cause detonation and blow some rings..... oh wait...........

[l0WRB]

update

4 cracked piston ringlands

oh joy lol

[paulr33]

i am surprised you are seeing this much damage

the stock ecu would have dropped to low octane map the moment it saw detontion, so that could have been well before it went bang

it also would have been activating its rich and retard cut proteciton

long before you flew past 16psi pressure.

i expect there is something missing from the picture

check the usual suspects

fuel rail / reg

fuel pump

something has made it fail in a big way, so make sure you double check all of these before rebuilding and trashing it agian. make sure its tuned properly and the afrs are checked to be safe. get an ecu with knock support so you can see detonation.

[l0WRB]

i am surprised you are seeing this much damage

the stock ecu would have dropped to low octane map the moment it saw detontion, so that could have been well before it went bang

it also would have been activating its rich and retard cut proteciton

long before you flew past 16psi pressure.

i expect there is something missing from the picture

check the usual suspects

fuel rail / reg

fuel pump

something has made it fail in a big way, so make sure you double check all of these before rebuilding and trashing it agian. make sure its tuned properly and the afrs are checked to be safe. get an ecu with knock support so you can see detonation.

well i have bought a LINK ecu through aaron and im pretty sure thats got a knock support on it, but ur right once car is back together only place it goes from there is pushed onto the dyno 4 its tune!

just lucky it didnt mark bore! still looks new, but still going to give it a hone..does anyone know any good online suppliers for pistons/rings etc?

[BHDave]

ouch. 4 of them!

Didn't see that coming.

regarding the rebuild; spend the money on rods and pistons now and maybe valve springs and head studs if you intend to run upwards of 20psi in the future.

For supply, talk to CRD or Just Jap who are forum sonsors, http://www.hioctaneracing.com.au/ do online sales.

Proengines on the forums has done rebuilds for a few members

[l0WRB]

ouch. 4 of them!

Didn't see that coming.

regarding the rebuild; spend the money on rods and pistons now and maybe valve springs and head studs if you intend to run upwards of 20psi in the future.

For supply, talk to CRD or Just Jap who are forum sonsors, http://www.hioctaneracing.com.au/ do online sales.

Proengines on the forums has done rebuilds for a few members

well ive decided once motor is back together im only going to run around 15psi tuned, head studs cross my mind but yeh i dont really have the money to be UPGRADING as i should say..will standard rods be fine for 300rwhp and 15psi?