Rb26: Noise Made When The Car Sees Boost!

[Turbz_13]

how r ya guys, 2day i was driving my gtr and i noticed a noise. when the car was under load(seeing boost) and when the car is warm.

i thought it was a slower clunking noise, i listened again and it was more of a quicker tinging/klacking noise. i have ball bearing turbos on it but the noise is actually coming from the other side of the engine(under the plenum)....can any1 plz help me!!

[Bluprint]

pinging?

[Amaru]

Bearings starting to spin?

[Turbz_13]

i had help describing it and the best we could come up with is a small rock, gumnut or metal bearing in a tin thats being shaken.

it only seems to happen then the car/turbos have heated up and when the boost is starting to clime above the 0psi mark...say 3500-4000rpm. but the noise still seams to b coming from the plenum side??????

[DVS JEZ]

hey buddy. sounds like its pinging. Check your timing. are you running A/M computer? also lift your bonnet up and whilst in nuetral free rev the engine up around 2500 to 2700RPM if you hear the noise while doing this, very possible that your big end bearings are gone.

Edited January 3, 2006 by DVS32R

[Rolls]

i had help describing it and the best we could come up with is a small rock, gumnut or metal bearing in a tin thats being shaken.

it only seems to happen then the car/turbos have heated up and when the boost is starting to clime above the 0psi mark...say 3500-4000rpm. but the noise still seams to b coming from the plenum side??????

<{POST_SNAPBACK}>

Your description really sounds like pinging. I always describe it as a nail in a tin bouncing around.

Do you have an unshielded pod? that could explain why its only once the turbos have heated everything up. Cold or hot days influence it?

[blk180]

God dam nice snail DVS32R

[GTR 94]

hey there i have just noticed this exact same problem it just started today as i was driving home, (sorry to hi jack the thread) i dont think its your turbos cause i just replaced my 2 months ago so im starting to lean towards pinging or big end bearing, does your car sound like its sucking more air aswell like a boost leak? i also found that im getting the same noise when reving in neutral but up around the 3000 to 4000rpm still not down low, im still running the standard ECU but it has been re mapped, to alow for the T517Z's im running but still only 14psi. if i just plant the foot when im driving it shows no sign of any problems but just powers on?

[Rolls]

when the bottom end bearing were on the way out on my old car the rattle was loud enough to set off the knock sensors so itd really lose power sometimes and others power on.

[Turbz_13]

mate that sounds almost exactly the same thing as is happening to me.

i have newer ball bearing turbos running 12psi, stock comp(re-mapped for larger injectors and more boost), makes the noise in neutral(when the car is warm!) around the same rpm as u said and yeah when driving as the boost comes on it starts to go! but there is no sign of any problems when the boot is down. i still have the stock air box on my car...no pods just yet!

i just drive it soft as to get to work and home again until i find out what the problem is!

if i can find out what it is i will let ya know ok mate!!

[Turbz_13]

well guys i better start asking what kinda cost will i be looking at for a rebuild just to stock specs 4-5grand??

[Turbz_13]

is it safe to keep driving around without hitting boost?? or say wothout goin ova 3000rpm??

[blk180]

The main cost would be R&R, new bearings ,new rings maybe crank will need maching and would do a new oil pump as well.oh and get a tomei metal gaskit kit.

If its a big end the more you drive it the more damage you do and the more it will cost fix

Edited January 4, 2006 by blk180

[Turbz_13]

2day i had to take the car for a longish drive...very soft driven tho. the guy i wne to see bout my pads told me to try this stuff 'Nulon E20 Performance Engine Treatment' i did as the instruction said and then reved the car in neutral up to 4000rpm and it seemed that the noise had stopped...could this just be a temporary? there is still a slight vibration when i was reving it tho

[DVS JEZ]

is a BIG snail. TO4Z.

i just built my motor spent bout 6g on it. shopped around for best prices on every thing. got JE pistons, N1 oil+ water pumps, metal gasket, head stud kit, balanced bottom end and head work,

i recommend you spend a little more on bearings and pistons than just a stock rebuild. worst part bout it is pulling the motor out. pain in the ass.

and will be pain in the wallet if you get some one else to do it.

[GTR 94]

hey Turbz_13 let me know how you go im going to see my mechanic tommorow to get the low down ill keep you posted. as for everything else i already have the tomie metal head gasket and all the top end was recoed and valve springs head bolts and stuff replaced. i left the bottom end cause i didnt think it would go so quick but i knew it was comming just a lil sooner than expected. Ohh well motor out forgies, new crank, oil pump blah blah blah, the joys of owning a modified car

just one more thing i wouldnt point the finger at the mods to your car as i know of a guy who spun a big end bearing on a standard motor with just over 80,000kms so its just the luck of the draw and thats cars!

[Turbz_13]

cheers mate, i will let ya know how i go. and thanks for the help

[NXTIME]

From what has been posted, it smells like bearings. My engine is doing the same thing. Slight knock at about 3000 rpm. I wouldn't drive the car at all as has been said, the more you do so the more damage to the engine and your pocket.

[Turbz_13]

i would luv 2 do it my self but i cannot afford the time and i dont hav the tool or equipment either. i guess im just gonna have to spend the cash

[GTR 94]

Well its official (sort of) GTR 94 is now off the road.

So as i said in my last post i was ready to take the car to my mechanic and i did as some of you would know i live in Geelong and my mechanic is in Melbourne. So one sunny afternoon i begin my mission and it begins well witth just a gentle tap tap tap around the 3000rpm mark. so driving at 100 isnt really a hassel cause your sitting at around 2800 anyway. well 112 km later i arrive at my destination and things still look good, my mechanic listens and says "hmm sounds like a gungen pin" (sorry for spelling) so i say cool, but then i tell him the story about " car running on empty went to the servo, full tank of fuel drive 8 km and thats when the noise began" and he says " ETHANOL" thats no good i think to my self wondering why i let it run so low and why i went to a different servo in the first place than my usuall one.

well anyway i relise that bottom line its gonna need a rebuild so i begin my journey home when i notice that the oil temp gauge is starting to read higher than its usuall spot, but i continue driving and make a quick stop at my tuners (not the fish ) and ask him to listen to it, he says "its deffinatly big end bearing and says you really shouldnt drive it home!" ok well too bad i gotta get home. so i continue driviving and now the noise sounds more like a jack hammer and its banging away anywhere from 2000rpm and up. sure enough 258km from when my mission started it turned to glum i pull over and the banging is now louder than ever and even at idol its not happy.

So on a trailor and tow it home.

Moral of the story dont drive when banging is occuring, and your not really gonna know whats wrong untill you open it up and take a peek inside. ive had 3 different options and i still dont know. one more thing dont ask your self "Hmm i wonder how much further i can get cause how long is a piece of string!"

well thanks for reading i guess now you wont hear from me till its finished. good luck on all your travels.