Engine Problems!

[christian_mr32]

Dear all,

I need your help and your opinions, it would be greatly appreciating if you could as I don't know what to do no more...

Where should i start,

Well I've owned my car for the past 2 years now and had no problems with it what so ever until this year!

I had purchased an RB25 NEO turbo and asked chasers motorworks to put it on for me. Everthing wnet swell until i had purchased a boost contoroller and boosted it to about 12psi, after a while like say about 2 months it made a very strange noise like a whining noise in early rpms and goes away when boost kicks in. I assumed it stuffed up... But after a while blue smoke had come out of no where?!! So i straight changed the oil but still blue smoke... Chasers then told me my bearings were gone, so i bought a replacement RB20 for GTS4 to swap with but also asked them to look at the turbo to see if there were any problems with it and they mentioned that nothing was wrong with it...

So when they finished the job it was running smoothly with major serviced done to it...

AND now its come to the time that its happened again and this time i put thicker oil and still no GOOD...

What do you guys reckon it is? Does the turbo have to do with anything because ever since i put that turbo it all started going down hill with my car.... What is the best suggestion to what i should do now???

Also are BC coilovers good? or should i go for TEINs? as all my coilovers are leaking and one is seized

[mad082]

from what i have read on other forums BC coilovers are good. tein are also good. i know that the teins give a nice ride and aren't very rough. not sure about the BC ones.

as for the smoke, sounds like it could be one of a few things. more than likely going to be the oil seal on the turbo. don't know if they are replaceable or not. don't think they are, but i don't really know too much about that sort of thing. there are other possibilities of what it could be, but if you have put in a second motor and it still does it then it is more than likely the turbo.

[christian_mr32]

from what i have read on other forums BC coilovers are good. tein are also good. i know that the teins give a nice ride and aren't very rough. not sure about the BC ones.

as for the smoke, sounds like it could be one of a few things. more than likely going to be the oil seal on the turbo. don't know if they are replaceable or not. don't think they are, but i don't really know too much about that sort of thing. there are other possibilities of what it could be, but if you have put in a second motor and it still does it then it is more than likely the turbo.

They pretty much put the same turbo that was already on my other motor, It must be the turbo.... Well i hope because i reckon it'll get worse again if i don't replace soon... It burns oil pretty quick...

Do you what oil pressure it has to sit on? On a cold start it sits on 4 and when warm sits on the line before 4... Is this normal?

[Galois]

hey dude,

12psi is the supposed safe limit of the r34 turbo. plenty of people quickly turn to the turbo when oil fires from the back, ie +1 to turbo

[christian_mr32]

hey dude,

12psi is the supposed safe limit of the r34 turbo. plenty of people quickly turn to the turbo when oil fires from the back, ie +1 to turbo

I don't understand what you're trying to say? This turbo apparantly come with nylon type compressor wheels... maybe they are not meant to last long in high boost? I don't know, all i know is this turbo is stuffing up my engine... Too me i really hate polluted cars especially when its mine...

Does anyone live around the western suburbs of Melbourne... If so what mechanic would you recommend to go and I'm definatly not going back to Chasers Motorworks...

Thanks guys...

[mad082]

the nylon compressor wheel has nothing to do with what galois is saying. the ceramic exhaust wheel on the other hand does. these often fail once the boost has been wound up above 12psi, however that is when they are run at that boost on the standard engine they were designed for. since you have the r34 turbo on an rb20 it isn't quite so much of an issue.

the turbo itself won't really be damaging the engine as it is the turbo that it most likely to be stuffed. the smoke is more than likely being caused by the oil seal inside the turbo no sealing properly and allowing oil to enter the engine and burn. it may be the rear seal that is leaking though and that won't have any oil entering the engine, the smoke will just be caused by the heat of the exhaust burning off the oil. to work out which it is, pull off one of the intercooler pipes (preferably the one from the turbo to the intercooler) and look for oil. if you see oil in the pipe then the turbo is the problem.

[Galois]

couldn't have worded it better myself mad (literally haha). r34 (and apparently s2 r33 turbo's as well) are 5-7 psi stock and unlike nice flexible steel ones do not cope well with boost above 12 psi. there are quite a few cases on these forums of people picking r34 turbo parts out of their cat lol. 12psi is on the edge of the efficiency range of the turbo anyways (ie: 16 psi generates little more hp than 12psi).

listen to mad, his advice has steered a lot of us in the right direction many times

hope it works out mate

[christian_mr32]

Thanks a lot guys, i'll have a look tomorrow morning... If i cannot find anything i might remove it and send it out for repairs or possibly a rebuild but who knows what it might be... Hopefully nothing too major...

Thanks heaps for your help, i'll let you guys know what happens...

[mad082]

couldn't have worded it better myself mad (literally haha). r34 (and apparently s2 r33 turbo's as well) are 5-7 psi stock and unlike nice flexible steel ones do not cope well with boost above 12 psi. there are quite a few cases on these forums of people picking r34 turbo parts out of their cat lol. 12psi is on the edge of the efficiency range of the turbo anyways (ie: 16 psi generates little more hp than 12psi).

listen to mad, his advice has steered a lot of us in the right direction many times

hope it works out mate

the r32 and s1 r33 turbos suffer the same problems as the s2 r33 and r34 turbos as they all have ceramic exhaust wheels and that is what lets go.

that said, i ran my r33 at 14psi for a long time and never had an issue with the turbo.

as for the 16psi vs 12psi, a mate of mine did this on the dyno and made about 20kw more on back to back runs, but 16psi is getting to the limit of what the stock turbo will efficiently flow. the only real reason why people think that they run out of puff there is because of misinformation on the internet. what is safe to run on the stock turbo without the turbo stuffing up, and when the turbo stops making power are, in the case of the skyline turbos, 2 different things. if the stock turbos had steel wheels everyone would be running 15psi on them like they do on the sr20's.

[christian_mr32]

the r32 and s1 r33 turbos suffer the same problems as the s2 r33 and r34 turbos as they all have ceramic exhaust wheels and that is what lets go.

that said, i ran my r33 at 14psi for a long time and never had an issue with the turbo.

as for the 16psi vs 12psi, a mate of mine did this on the dyno and made about 20kw more on back to back runs, but 16psi is getting to the limit of what the stock turbo will efficiently flow. the only real reason why people think that they run out of puff there is because of misinformation on the internet. what is safe to run on the stock turbo without the turbo stuffing up, and when the turbo stops making power are, in the case of the skyline turbos, 2 different things. if the stock turbos had steel wheels everyone would be running 15psi on them like they do on the sr20's.

Hey buddy,

Thanks for the advice it really helped out. I removed the intercooler pipes and found loads of oil in the pipes... I knew it was the turbo all along, I swear i ask chasers to do something for me and they don't even listen to me... When the engine was getting swapped i specifically asked them to make sure had a look at the turbo but no they didn't... Can't even find decent mechanics around these days...

Thanks mad for your help, much appreciated... Im gonna get into it and get it fixed