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Am I Gonna Kill My Turbos?

RB26TTVL

By RB26TTVL,
in Engines & Forced Induction

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RB26TTVL Community Regular

RB26TTVL

Posted
Posted

A littl while back I blew the ceramic turbos, and had them rebuilt hi flowed with steel wheels. After putting it all back together, it also seems that the engine has suffered a bit from the turbos blowing up - it's down on compression in cylinders 2 and 3 and blowing a bit of smoke (but only on gear changes of whem blow off valves open)

Anyhow, I haven't had the time or cash to pull the engine down for what I understand will be a rebuild at some point in time.

What I do want to know is - and this may seem a stupid question but bear with me, my old man has organised a drag meet/speed trial in my small home country town - he wants as many cars out there as he can, and would like me to run mine, even if it's just a couple of half hearted runs - but lets face it, does anyone ever go half hearted?

What is the chances that I'm gonna do some real damage - like dropping a bearing, or putting some crap through my new turbos?

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stolen_s15 Mentor

stolen_s15

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Posted (edited)

From the soudn of things you will do some serious damage!

If your engine is on the edge then flogging it will more than likely make it go pop. If the turbos are recently rebuilt, then they should be ok. Either way its rebuild time for you. :yes:

Edited by stolen_s15
Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

find out why its low on compression. do a leak down test and a compression test. if its just worn rings then go for it hammer the crap outta it till it dies i say :P

post your compression details

RB26TTVL Community Regular

RB26TTVL

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find out why its low on compression. do a leak down test and a compression test. if its just worn rings then go for it hammer the crap outta it till it dies i say :P

post your compression details

Yeah, I've got the results written down at home, I'll post em up tonight, but just from memory, I think all cylinders were about 145-150, and cylinders 2 and 3 were down by about 10.

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted
Yeah, I've got the results written down at home, I'll post em up tonight, but just from memory, I think all cylinders were about 145-150, and cylinders 2 and 3 were down by about 10.

down by 10psi isnt a real issue, its not perfect but if the biggest variance you have is 10psi between the highest reading and lowest reading piston thats should be ok.

How many kms has the motor done? What oil are you running? If the motor is just a little tired because of high kms, hence the oil burning, i would still beat up on it.

Change the oil and filter before you go, and have some fun i would say.

RB26TTVL Community Regular

RB26TTVL

Posted
  • Author
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I just found the comp results:

All cylinders were 145 - 150 like I said, but 2 and 3 were both at 125.

Not sure on how many kms engine has done, it came from a half cut that also had and aftermarket dash, which had 25, 000 on it. It's an R33 engine though.

Can't recall the specific oil, it's pennzoil I believe, certainly not cheapie stuff.

Sorry that I'm a bit vague, the car is stored at my folks place up country - no parking at my place :angry:

R34GTFOUR Mentor

R34GTFOUR

Posted
Posted

are you running twin turbos on a rb25??

well if the lowest reading is 125 then thats a 25psi difference and thats a tad too much

try and do a leak down test and see where its leaking, ie rings, headgasket, valves etc

if you dont really have the cash to fix it, dont push it then cause by the sounds of things the engine has hard a rough life and is on its last legs. In saying that if it was me i would still be booting the shit out of it, you gotta teach these engines a lesson... :D

RB26TTVL Community Regular

RB26TTVL

Posted
  • Author
Posted
are you running twin turbos on a rb25??

well if the lowest reading is 125 then thats a 25psi difference and thats a tad too much

try and do a leak down test and see where its leaking, ie rings, headgasket, valves etc

if you dont really have the cash to fix it, dont push it then cause by the sounds of things the engine has hard a rough life and is on its last legs. In saying that if it was me i would still be booting the shit out of it, you gotta teach these engines a lesson... :)

It's an rb26, with a set of slides hi-flows. I haven't had a leak down test done, so that might be the next step.

I'm def keen to give it a flogging, and I'm prepared to cop some ring/piston/bore damage, but not so keen on dropping a bearing or valve, or putting some big chunks through the turbos.

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