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The Near End Of My Rb25de+t

dori34

By dori34,
in Engines & Forced Induction

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dori34 Grand Master

dori34

Posted
Posted

Well, its been a good 8-9months (4x,000km), car copped a good thrashing at numerous track days, hill runs, skid pans and it is nearly at the end of it's life.

117,000KM later, the car is now experiencing excessive blow by......

all cooler & intake pipes have sh*tloads of oil in it and the AFM & inside of air filter is literally painted with oil. i've installed a catch can just to see how much it collects in one day. car runs smooth until the AFM is covered in oil then it gets lumpy idle (sounds like stage 1 cams :lol: ) it drives smooth still but when i try to floor it, theres a lag in boost and it feels as if im running at 50% power then what it was before.. such a sad weekend for my car but i already have someting big planned for it for this year so i will update later on when it is nearly completed ;)

I had a feeling the compression wasn't perfect from day 1 when i did the conversion as i noticed a tiny bit of oil around the sparkies when i did the service.

i guess 14psi was just too much for it..

it made a good 204rwkw / 549nM on 14psi on a 30degree day.

after some fun @ twisties run on Sat night, the car started missing at the end of the night.

wouldn't boost properly, stuttering, rough idle, sounded funny when it did boost.

problems found;

1) 1x bolt fell off screamer pipe so it was open (hence funny sound) so everytime i gated, massive amounts of heat melted the wiring loom & o2 sensor loom......

2) vaccum line from ebc to wastegate melted as it was near the screamer, the hose was as hard as plastic and just snapped in half

afm

ej5ve0.jpg

cooler pipes/tb

35mpc00.jpg

iogj5u.jpg

intake

24z9htw.jpg

Looks like my rings are f*ked?????

but it's not blowing any blue/grey smoke tho.

Willl get a comp test & leak down test just to see how bad the damage is but as long as i baby it now and dont give it hell, it should last a few more months of "sedate" driving.

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MBS206 Grand Master

MBS206

Posted
Posted

Check your PCV, how's it all plumbed in (The breather lines)

Looks like an issue I had... Also, if the front seal goes, it'll pump oil through like you have.

If you've truly done a ring landing, in my experience when on boost it'll go fine for a bit, then just blow a shit load of oil... It's how mine used to... Just pressurised the crank and oil goes everywhere through the motor

When mine dropped a ring landing, I had a miss on idle (Sounded like lumpy cams) a drop in power, but the car ran smoothly once up off idle, and blew smoke after a bit of kicking it in the guts...

Do a compression test... I had cylinder 3 drop to 70PSi, when I did the wet test, it went to 125... The sad part... All other cylinders held out at 155PSi dry, 165 wet...

dori34 Grand Master

dori34

Posted
  • Author
Posted
When mine dropped a ring landing, I had a miss on idle (Sounded like lumpy cams) a drop in power, but the car ran smoothly once up off idle, and blew smoke after a bit of kicking it in the guts...

Thats exactly how it is now minus the smoke

will report back after getting the comp test done.

WYTSKY Veteran

WYTSKY

Posted
Posted

oh no man, that sux!

hope you got some nice new goodies planned for it!

You know what's funny... I was actually thinking i should give mine a compression test the other day as I have noticed a little bit more blow-by then normal when on full boost....

car still running sweet though so not too worried. I think it's just the bush bearing of the hypergear turbo...

gl with it man.

p.s trolling with like 4 threads eh?

SKiT_R31 Experienced

SKiT_R31

Posted
Posted

easy way to tell if its the turbo or the engine is to bull off the breather/oil cap and idle it, if its pissing out fumes on idle and under rev's she's knackered.

I've got an R33 in my driveway atm with the exact same issue (factory RB25DET) the rings are just knackered. I've disconnected and blocked all breathers at the manifold and put the hose for the rockers into a ventring catch can. Fills it after a bit of a thrash but i just tip it back in. Most of the dodgy running is due to the fumes in the intake, if you just vent they go alot better, mine doesnt blow exhaust smoke either.

dori34 Grand Master

dori34

Posted
  • Author
Posted

white smoke does come out of the oil cap when warm & running but doesn't happen when it's cold.

i installed a catch can and so far so good, the oil isn't going to the afm so i guess its working & collecting the oil, at least it idles fine.

Changing the spark plugs tomorrow and im expecting to see a crap load of oil on them

hypergear Grand Master

hypergear

Posted
Posted

My engine blew up on me twice. I didn't end up with massive amount of oil in the throttle body or cooler piping. Most of oil just shoot like a high pressure pistol from the dipstick pipe.

To me that much of oil is unlikely to be the turbo. But check to see if it turns or got shaft play or missing wheels.

dori34 Grand Master

dori34

Posted
  • Author
Posted
My engine blew up on me twice. I didn't end up with massive amount of oil in the throttle body or cooler piping. Most of oil just shoot like a high pressure pistol from the dipstick pipe.

To me that much of oil is unlikely to be the turbo. But check to see if it turns or got shaft play or missing wheels.

Hey Stao,

I checked the turbo front wheel, perfect condition, no shaft play at all & no oil shooting out from dip stick area.

im pretty sure its the rings but i could be wrong, i am changing sparkies tomorrow because atm its stuttering in low revs so if theres oil on the spark plug then the rings are definitely gone.

i noticed oil in there before i did the turbo covnersion but it was very little.

N-DAWG Mentor

N-DAWG

Posted
Posted

Hope you get it all sorted out man :) I'm looking forward to seeing the result of what you got planned though... gonna be a well powered responsive setup! ps. I emailed you a link to RB26DETT Exhaust Manifolds and Heat Shields :ermm:

  • 3 months later...
kawasakirider Grand Master

kawasakirider

Posted
Posted

Hey mate, just curious if you have a build thread for your +T conversion? The reason I ask is I am considering buying a 34 gt as I'm on my P's and selling it for a GT-T later. But if it's easy enough to turbo and get good power without going insane with the boost (7 psi, not nearly a whole bar like you have) it may be the go.

Cheers

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