Supercharged/TurbochargedThe increase in air/fuel pressure above atmospheric pressure in the intake system caused by the action of a supercharger or turbocharger attached to an engine.
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As my usual luck goes with my car, there's a possible problem;
I went for a 1-3rd gear WOT run, to get it on video, and as i reached about 5800rpm or so in 3rd gear (probably where the turbo is spinning at its fastest at my set boost level), I suddenly heard a change in tone, it got deeper and also noticed a drop in power, i let off right away, you see this at :18 in the vid.
I then just cruised and got into a little boost again to see what it did, listen at 1:07, this is where you hear the noise very clearly. WTF IS IT!
Well form what I know that shaft play is huge, that might be the cause of your problems. Im not sure if you can re-balance it. But did the turbo make the desired pressure?
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Im going to take another vid clip tomorrow, because the play is not THAT big, there is def play but not how it looks (it was hot so i couldnt move it with bare fingers).
You can expect some play... but its the left and right play thats bad... the in and out play is normal. Some turbos have more in and out play then others.
1. 2003 titanium edit blacked out,Hks Exhaust, Jim wolf Pop Charger, 17Deg advance, Nex Coilovers, staggered 20" (yaya i know)
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First off i wanna say i think i jizzed myself when i saw that tach take off on that pull and hear that turbo... in a maxima lol.
The shaft play, beleive it or not, appears somewhat normal to me. I've had freshly rebuilt turbos with shaft play like that. Just look for tall tell signs of rubbing or scoring on the compressor housing from the blades, do you see any?
Not sure on what that noise was but on that first pull, the loss of power may have just been the tranny slipping slightly or torque converter clutch perhaps? Im assuming its an auto.
First off i wanna say i think i jizzed myself when i saw that tach take off on that pull and hear that turbo... in a maxima lol.
The shaft play, beleive it or not, appears somewhat normal to me. I've had freshly rebuilt turbos with shaft play like that. Just look for tall tell signs of rubbing or scoring on the compressor housing from the blades, do you see any?
Not sure on what that noise was but on that first pull, the loss of power may have just been the tranny slipping slightly or torque converter clutch perhaps? Im assuming its an auto.
at that power, perhaps the clutch isnt holding (jime disables his clutch for his nitrous runs cuz it dosnt hold either), but i really really doubt its anything to do with the TC or the Tranny, reason being is, how come it made noise back there when I tried to get into boost again? its something with the turbo/muffler.
I just inspected the charge pipe, and its completely dry, took off muffler, and completely dry, there is zero in and out play, and very very minimal side to side play on the turbine side, the turbo seems as if its in great shape, I this point im lost....
at that power, perhaps the clutch isnt holding (jime disables his clutch for his nitrous runs cuz it dosnt hold either), but i really really doubt its anything to do with the TC or the Tranny, reason being is, how come it made noise back there when I tried to get into boost again? its something with the turbo/muffler.
I just inspected the charge pipe, and its completely dry, took off muffler, and completely dry, there is zero in and out play, and very very minimal side to side play on the turbine side, the turbo seems as if its in great shape, I this point im lost....
Quote:
Originally Posted by turbizzy
First off i wanna say i think i jizzed myself when i saw that tach take off on that pull and hear that turbo... in a maxima lol.
The shaft play, beleive it or not, appears somewhat normal to me. I've had freshly rebuilt turbos with shaft play like that. Just look for tall tell signs of rubbing or scoring on the compressor housing from the blades, do you see any?
Not sure on what that noise was but on that first pull, the loss of power may have just been the tranny slipping slightly or torque converter clutch perhaps? Im assuming its an auto.
the shaftplay looks ok to me, and you aid that there is no in and out play, i would take off the compressor housing off, if thats a hx35 then theres a large "C" clip other wise look for the 6-8 garrett bolts thats holding it on and tell us what you see. is should be smooth and not ribbed
Yea no in and out play at all, no lines came loose or anything, im not 100% sure if boost dropped since i was looking at the road, but you def felt power drop.
I have been driving around more, getting into boost once a while and havnt felt or heard anything yet. I have a theory as to what may have happend, I have a .052 restrictor in there and might be too small, its probably ok for an occasional WOT but not a full run, so perhaps since i did a full run from a stop to high 3rd gear, the turbo was starting to starve for some extra oil. I am going to put in a larger restrictor and drive around for a while to see what happens.
The more I watch the vid the more I'm convinced it's transmission related. The 1-2 shift took a little longer than it should have (compare to the 2-3 shift) and you hear the same screech/whine during this time as you do toward the end of the video. What were the tranny fluid temps looking like during the run?
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the shaftplay looks ok to me, and you aid that there is no in and out play, i would take off the compressor housing off, if thats a hx35 then theres a large "C" clip other wise look for the 6-8 garrett bolts thats holding it on and tell us what you see. is should be smooth and not ribbed
OT but I am feeling the double scoops
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The more I watch the vid the more I'm convinced it's transmission related. The 1-2 shift took a little longer than it should have (compare to the 2-3 shift) and you hear the same screech/whine during this time as you do toward the end of the video. What were the tranny fluid temps looking like during the run?
I am 300% sure its not related to transmission. Reason the 1-2 shift was like that, was because because I had it on manual mode and shifted to early.
the sound came from the back passenger side corner, there absolutely no question about that.
also, transmission temp was same as any other run, normal temps.
Sooo yea, my turbo is definitely screwd up! the shaft play is alot more than normal, its actually touching the housing. I just got another used HX thats good, has normal play. I made a video to compare both.
That Maxima sounds beast as ****. 1st of all, and yeah in the comparison video the shaftplay is absolutely insane compared to the new one, I'm no turbo expert, but it can't be good when the blades are hitting the housing at hand's touch, imagine that spinning at 5800 rpm.
Yea, i just hooked up the good turbo, i put in there the .9# restrictor along with a newer pump, new return (turbo to pump) hard 1/2 line, and also hooked up my oil pressure sending unit after the restrictor, to see wat the pressure reads with that restrictor.
I am still in the process of determining what is the best restrictor. Today iv spent the day testing things out and changing my turbos. I put a oil pressure sending unit after the restrictor, and it measured the same oil pressure as the engine (exactly no change), my theory is that the checkvalve thats right at the turbo is holding back flow making the pressure stay up, so what im going to do tomorrow is put the sending unit, AFTER both the checkvalve and the restrictor, to see how much pressure is showing right at the turbo, this should finally tell me what restrictor to go with (I hope).
But I gotta say, i've never heard of putting an oil pressure restrictor to the turbo. In my Mustang SVO i've got full engine oil pressure going to the turbo and a large drain tube, on my boy's Supra we have full engine oil pressure going to the turbo and on my other friend's Chevy 350 we've got full engine oil pressure to the turbo so.... i don't really get why you feel the need to add a restrictor? Maybe there's something im missing here.
But I gotta say, i've never heard of putting an oil pressure restrictor to the turbo. In my Mustang SVO i've got full engine oil pressure going to the turbo and a large drain tube, on my boy's Supra we have full engine oil pressure going to the turbo and on my other friend's Chevy 350 we've got full engine oil pressure to the turbo so.... i don't really get why you feel the need to add a restrictor? Maybe there's something im missing here.
MOst turbos need onlu 10-20 psi of oil pressure. most cars can run 70-100 psi under load. That would blow the seals in most turbos. The restrictor is to keep oil from building in the turbo and causing a smoking issue or blowing the turbo.
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I just did what I posted previously, relocated the oil sending unit to right before the turbo (after checkvalve and restrictor), and with a .092 restrictor, at idle with engine at 80psi, turbo oil pressure was like 5psi (barely). I rev'ed it just a tad bit to increase pressure a lil bit, and turbos pressure barely went up (went to like 10psi). Took out the jet, got another one and drilled it out as much possible without affecting its structure (basically to not have any restriction). now idle psi at turbo was reading like 10psi, and when rev'ed it was reaching about 30psi. I have not driven the car yet, but I will today. It seems that the check valve I have on there is functioning as a restrictor itself, so I might not need any additional restriction.
So I went for a drive. the turbo is getting max 50psi (which is perfectly within spec), idle might be lil too low but its prob good enough, like 5-10psi.
Now the problem is, since im having alot more flow, im getting some smoke, I am pretty sure the reason being is that the scavange pump is not pulling enough oil on time and its causing some pressure on the return from turbo.
I just bypassed the switch the pump has, so it could run at full power the whole time, hopefully that will do the job, if it dosnt. Then I am thinking of running two pumps! make a T right at the turbo's drain, one leg goes to one pump, the other to the other pump, then run two lines to the engine, that will be more than enough return flow, should work.
3? i got only one installed, and was contimplating if to put the 2nd one, but i might not do that. I went ahead and put in a .092 restrictor, haven't been flooring it alot, but might do the job. pressure is the same, just less flow.
Here are pictures of the shaft of the bad turbo, you can clearly see how there was metal on metal contact against the bearing, u see that copper color along with blue, which is the ingredients for overheating/metal touching.
I thought you were spraying meth too, that' usually a shurflo. For the oil you could try a variable restrictor, just set it to where it's best.
oh yea forgot about the meth pump lol.
That variable restrictor looks cool however, id want to know how much its restricting though, n from the looks of that. i wont be able to know. dont wanna end up with another starved turbo
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