Replacing turbo

Q&A regarding engines, turbos, and intercoolers and power upgrades

Postby Cormudgen » Tue Nov 09, 2004 9:44 pm

dangit, now i'm just gettin pissed off. the jbweld dint hold agian today.

looks like i'm going to have to replace the nipple. caleld toyota parts bu they are closed for the day already. i have a feeling i'm not going to be able to buy just this part anyway.

anyone know where i can get it from

it is a nipple that screws into the top right side of the turbos compressor housing for the purpose of a vaccum hose to connect on to(which presumably goes to the wastegate).

here are some pics:

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Postby T-spoon » Tue Nov 09, 2004 10:52 pm

Well..hang on a sec.. I have a spare turbo sitting around with a snapped shaft, was going to sell it to a local guy (he doesn't need the turbo, just a core trade), if I can get that nipple out undamaged, paypal me shipping cost and I can send it to you, he won't need it for what he's doing with it. Of course, then you'd have to wait for it to get through the mail, so up to you, you could always pay for the fastest shipping, I can't see it being terribly expensive for that tiny part, but I don't ship much, so couldn't say. Anyway, if you're interested, shoot me an email to vishdav@yahoo.com
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Postby Cormudgen » Wed Nov 10, 2004 1:21 am

thanks a lot for your help t-spoon

fortunatly i was able to get some type of nipple that worked perfectly from lowes

so we get evertying all back together and go to drive. i drie about 100 yards and hit a 7 pounds of boot in 3rd gear.

bshhhhh

sounded like my bov blew off (from the somehwhat jerryrigged way I have it ont there-its done it before but only at like 11 pounds on odl turbo) but the car doesn't stall. we pull over. nothing in the engine bay looks disconected or antying. granted its dark but can't find anythign

start to drive again and car runs perfectly fine but makes NO boost. serioslyu won't go past 0 pounds

drove it home and called it a night

only thing I can think of is that somehow my wastegate must be completly open or the turbo seized up. any suggestions. tomorw I intend to check all lines and pull the intake from the turbo to the air filter off to make sure the turbo didn't siezed

all help is appreciated
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Postby T-spoon » Wed Nov 10, 2004 1:49 am

Nah, I'm betting it's something simple, I wouldn't worry about it until you can see. Check all the piping and all of the manifold and turbo connections. When my first MR2 got rearended, the shock worked several nuts/studs loose and ended up with little gaps between the turbo and manifold, wouldn't boost even a single PSI. Like you said, could also be something with the wastegate, stuck open or something. I would really doubt the turbo is seized already, but you never know. You should be able to spot the trouble when you get things opened up in the light.
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Postby Cormudgen » Wed Nov 10, 2004 3:28 am

T-spoon wrote:Nah, I'm betting it's something simple, I wouldn't worry about it until you can see. Check all the piping and all of the manifold and turbo connections. When my first MR2 got rearended, the shock worked several nuts/studs loose and ended up with little gaps between the turbo and manifold, wouldn't boost even a single PSI. Like you said, could also be something with the wastegate, stuck open or something. I would really doubt the turbo is seized already, but you never know. You should be able to spot the trouble when you get things opened up in the light.


gosh i hope so. thanks for the encouraging words. seems like it will be something really simple/small for the car to still have driven as well as it did. its just tracking it down......

another disadvantage is i NEVER have any light until sautrday. i dont get off work until there is only 20 min of light left so by the time i get to the car its already dark.
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Postby Cormudgen » Wed Nov 10, 2004 6:34 pm

Udate as of this lunch:

took the intake to turbo compressor elbow off to check to see if the turbo has seized up. thankfully no....but.

where the shaft comes thru the compressor blades, there is a nut that tightens down on the compresor blades. this nut had come loose. essentiay it seems like that would make the turbos exhuast side spin spinning the shaft whcih then spins INSIDE th compressor blades. that wold cause it not to boost. unfrotunately, the nut they used isn't a regular hex nut. its completly rounded with straight grooves all in it. (don't really know what kind of tool that would require).

so i tried tightening it by using pliers. another thing is that once it gets tightend up to the compresor blades, you have to hold them to keep from spinning(i'm concerned about breaking due to them being ceramic). i tightend it about as tight as i could and then decided to go driving.

crank it up and rev it up a couple of times to get it warm.
WHITE smoke. the reason for changing the turbo out in the first place!
granted the used turbo I bought did have a little bit of shaft play, but whil driving it last night before the prolbem i had no white smoke. so i continute to drive to see if it will boost. nop, no boost.

i dint get a chance to check to see if the nut was loose again but here is what i'm assuming are the problems

Problem of turbo not spoolling:
nut probaly came loose again and shaft is spinning freely inside compressor blade

Problem of white smoke
1. this turbo is blown as well, whether before i bought it or last night somethign happend blowing it
2. head gasket is bad and it did not blow white smoke last night b/c i had flushed the coolant system and not enough pressure had built up to push coolant out yet, only the excess air

I intend to do another compression check tongiht but last one i did pulled good numbers. Hopefullyy compression reads good numbers again and that would pretty much isolate it to the turbo(at which point I can try and get money back for this one and order the CT27 with my core.)

Any suggestons would be greatly appreciated.

**on a side not, my friend said that in his experience of f-bodies(transams/camaros/firebirds) have coolant seals somewhere in the intake. does our car have any? none that I know of but wanted to confirm.
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Postby T-spoon » Wed Nov 10, 2004 10:54 pm

Ah, oopse, I misread before, I thought it was a new or newly rebuilt turbo, didn't know it was used. Odd that nut was loose, never heard of that happening. They usually slice off a bit of the nut on a particular side for balancing reasons I think, so I'm not sure even if you could get it tight it would be balanced properly anymore. Is your coolant temperature stable? I would expect it to be quite unstable if your headgasket was bad.
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Postby Cormudgen » Thu Nov 11, 2004 12:27 pm

the point your brought up about being able to have a balanced turbo i a good one.....

temp of car is stable. the day i bought the car it took an 8 hour drive. next day drove 8 again. it has taken may trips of 2 horus and longer as well. there is never even a noticeable drop in coolant loss.
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Postby gt_turbo » Thu Nov 11, 2004 3:06 pm

well that sucks that your turbo doesn't boost. and i've never heard of the nut you are referring to being loose. maybe you just have your vac hoses on wrong or they are leaking somewhere.
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Postby Cormudgen » Thu Nov 11, 2004 3:30 pm

gt_turbo wrote:well that sucks that your turbo doesn't boost. and i've never heard of the nut you are referring to being loose. maybe you just have your vac hoses on wrong or they are leaking somewhere.


i have no doubt that that is the reason i'm not making any boost. it makes perfect sense. the shaft is simply spinning inside the copmressor blades. without the compresosr blades spinning you won't make any boost.

my concern is why i'm blowing white smoke. the turbo made boost for the first 30 secs i drove the car. up to 7 psi fine, but then it mad the loud bshhhhhh noise and THEN stopped boosting. thats the point when i figured out that nut was loose.
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Postby danny » Mon Nov 15, 2004 2:06 am

Hey this is Tim......
I hate to say it but I think you blew the seals on that JDM CT as well. What you can do it have the original turbo rebuilt. The seals get hard and cracked over time. Who knows how long that sat on a shelf or in a car that didnt run for a while. try this site...I get alot of turbos done there. http://64.225.76.178/main.htm
Best of luck to ya.
If you need any help email me at tim@av-performance.com

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Postby alltracman78 » Tue Nov 16, 2004 11:06 am

Cormudgen wrote:so i tried tightening it by using pliers. another thing is that once it gets tightend up to the compresor blades, you have to hold them to keep from spinning(i'm concerned about breaking due to them being ceramic


Just a note, on the jdm turbos that actually are ceramic, it's the exhaust side, not the intake side that is ceramic..
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Postby Cormudgen » Tue Nov 16, 2004 9:09 pm

alltracman78 wrote:
Cormudgen wrote:so i tried tightening it by using pliers. another thing is that once it gets tightend up to the compresor blades, you have to hold them to keep from spinning(i'm concerned about breaking due to them being ceramic


Just a note, on the jdm turbos that actually are ceramic, it's the exhaust side, not the intake side that is ceramic..


thanks for pointing that out man. i didn't know that and was wonderin why i couldnt tell the difference
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