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Old 09-22-2021, 03:29 PM   #26
ZVOLV
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A cracked turbine housing can cause low boost.

I wouldn't blame the guy that did the work.
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Old 09-22-2021, 05:23 PM   #27
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I agree with the current remarks - you have what appears to be a stock setup, with everything looking as it should in the pics you're posting. It would be wise to know where the fault lies, since it may not be the turbo. Could be low fuel pressure, bad cap / rotor, or a range of general tuning things needing attention. Checking the wastegate rod would be #1 on the list..
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Old 09-22-2021, 06:40 PM   #28
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"gauge only really reaches half the boost"- that's where it should be on the stock 13C.
Check the transmission kickdown cable connection at the throttle spool.
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Old 09-24-2021, 01:33 AM   #29
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Quote:
Originally Posted by lookforjoe View Post
I agree with the current remarks - you have what appears to be a stock setup, with everything looking as it should in the pics you're posting. It would be wise to know where the fault lies, since it may not be the turbo. Could be low fuel pressure, bad cap / rotor, or a range of general tuning things needing attention. Checking the wastegate rod would be #1 on the list..
I've just done an overhaul on the car to get everything to Stage 0 except fuel injectors.
So I'm going to look into that shortly after replacing or fixing the current turbo on the car.

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A cracked turbine housing can cause low boost.

I wouldn't blame the guy that did the work.
But the guy who worked on it said they installed a new turbo that was smaller than the one originally that was fitted on the car from factory which is why he was saying its not reaching the original boost targets. I'm not sure how much to believe but I feel like its possibly a wastegate rod issue that was preloaded improperly.

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"gauge only really reaches half the boost"- that's where it should be on the stock 13C.
Check the transmission kickdown cable connection at the throttle spool.

Never goes beyond half though. Apparently when my uncle owned it he said it passes half by 1/4 or more.
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Old 09-24-2021, 12:07 PM   #30
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Hooking up a pressure gauge to see what's happening with the boost should be easy.
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Old 09-24-2021, 02:35 PM   #31
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So, there may be a communication issue - do you mean half of the gauge or half way up the boost section (so approx 3/4 gauge)?

Half the gauge is where you go into positive pressure. If it doesn't go beyond the middle, it's not making any boost at all. Doesn't matter what turbo it is, that would be a setting issue (wastegate, etc.)
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Old 09-27-2021, 05:30 AM   #32
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So, there may be a communication issue - do you mean half of the gauge or half way up the boost section (so approx 3/4 gauge)?

Half the gauge is where you go into positive pressure. If it doesn't go beyond the middle, it's not making any boost at all. Doesn't matter what turbo it is, that would be a setting issue (wastegate, etc.)
Yeah it doesnít really pass the middle much. So I suspect itís barely making any boost at all.
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Old 09-27-2021, 10:02 AM   #33
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Are you able to spin the turbo by hand through the inlet?
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Old 09-27-2021, 12:28 PM   #34
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Are you able to spin the turbo by hand through the inlet?
Yes it spins very freely!
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Old 09-27-2021, 01:15 PM   #35
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Maybe (though unlikely) your intercooler has a broken endtank?
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Old 09-27-2021, 09:17 PM   #36
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Checking the wastegate rod would be #1 on the list..
This. There should be a bit of preload on the wastegate flapper (~1/2 the diameter of the pin). If there is zero preload there will be little to no boost.
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Old 09-27-2021, 10:08 PM   #37
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This. There should be a bit of preload on the wastegate flapper (~1/2 the diameter of the pin). If there is zero preload there will be little to no boost.
I suspect that's the case.
On peddle to the metal, the boost gauge only reaches less than 1/4 after the half.

I ordered a digital boost gauge to figure out how much boost the car is making and we will go from there. Going to get some ramps and get under the car to adjust the turbo sometime this week.
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Old 09-27-2021, 10:09 PM   #38
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Originally Posted by Wilford Brimley View Post
Maybe (though unlikely) your intercooler has a broken endtank?
Could be possible, but the intercooler looks immaculate for the condition considering it has 350,000km on it already.

Might be something worth looking into upgrading you say?
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Old 10-11-2021, 07:02 PM   #39
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Update:

Was able to get underneath the car and take a look at the wastegate arm. Pre-load wasn't set properly and essentially it was only fitted on loosely once the clip was taken off.
I couldn't adjust the arm because the lock nut to keep the arm in place was seized. Used a 10mm wrench and turned it as hard as possible and it wouldn't spin loose. The nut eventually gave out and rounded itself with the Openbox wrench. Turning it counter-clockwise felt so tight it wouldn't turn at all.

Any ideas?
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Old 10-11-2021, 07:08 PM   #40
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Take the wastegage actuator off of the turbo and try to free things up off of the car where you have more room to work. Soaking in some PBlaster and a vice grips should help.
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Old 10-11-2021, 10:13 PM   #41
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^ This. With the actuator removed, clamp the rounded nut in a vice, then you can use vicegrips on the rod end to break it free. Once that is off, you can remove the rounded nut & replace it - after you clean the rod threads and apply never-seize to the threads
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Old 10-11-2021, 10:19 PM   #42
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Is the wastegate removal from the top or under the car again? Possibly try it tomorrow.
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Old 10-11-2021, 10:48 PM   #43
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Take the inlet hose off the front of the turbo and you should have plenty of access to the bolts holding the bracket to the turbo. It will be helpful if you have a vice or something else to clamp the actuator in place while you put a vice grip or something on the locknut. Once it’s off you can just remove the nut from the arm and replace it with a hardware store one. I bet it’s M6x1.0 or something common like that.
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Old 10-13-2021, 03:12 AM   #44
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Take the inlet hose off the front of the turbo and you should have plenty of access to the bolts holding the bracket to the turbo. It will be helpful if you have a vice or something else to clamp the actuator in place while you put a vice grip or something on the locknut. Once itís off you can just remove the nut from the arm and replace it with a hardware store one. I bet itís M6x1.0 or something common like that.

Fixed it. Sadly adjusting the wastegate actuator made no difference.
The boost bar only goes about 1/4 of the positive pressure.
Waiting for my boost controller to arrive in the mail so I can see exactly how much boost in digital I have at the turbo. Should I put a manual boost controller on it to see if there's a way to increase it? Or should I just replace the turbos?
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Old 10-14-2021, 12:16 PM   #45
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Have you checked all the basics? All related hoses in good shape/not soft/collapsing/leaking? Air filter, Timing, fuel pressure, plugs, etc??

Could be you have serious cracks in the hotside preventing building boost, but you need to know the status of all related systems. When you removed the inlet hose, did you check for radial play in the compressor shaft? (Not that that in of itself would prevent full boost, just indicator of turbine health).
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Old 10-16-2021, 09:54 AM   #46
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1/4 of positive pressure on the stock gauge doesn’t sound that far off but it’s been awhile since I was running a stock turbo setup. If I remember correctly you had no boost pressure at the beginning of this journey. Stock wastegate spring is around 6-7 psi if my memory serves.
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Old 10-26-2021, 12:19 PM   #47
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1/4 of positive pressure on the stock gauge doesnít sound that far off but itís been awhile since I was running a stock turbo setup. If I remember correctly you had no boost pressure at the beginning of this journey. Stock wastegate spring is around 6-7 psi if my memory serves.
There was but it was barely anything. Adjusting preload got me a tiny bit more.

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Have you checked all the basics? All related hoses in good shape/not soft/collapsing/leaking? Air filter, Timing, fuel pressure, plugs, etc??

Could be you have serious cracks in the hotside preventing building boost, but you need to know the status of all related systems. When you removed the inlet hose, did you check for radial play in the compressor shaft? (Not that that in of itself would prevent full boost, just indicator of turbine health).
Yup I checked everything else, replaced lines, filters, fuel pressure regulator, plugs, coils, distributor.
I just did a major overhaul on all the common failing parts to get the car back to stage 0.

I also checked the compressor shaft for any play, and none.

Would the waste gate not be sitting properly?
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Old 10-27-2021, 07:18 AM   #48
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I suppose anything is possible. You could remove the down pipe (just undo the nuts and force it to the side) and look in through the outlet to make sure the wastegate is seated properly and doesn’t have some kind of huge crack.
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Old 11-02-2021, 12:32 PM   #49
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Quote:
Originally Posted by ortho stice View Post
I suppose anything is possible. You could remove the down pipe (just undo the nuts and force it to the side) and look in through the outlet to make sure the wastegate is seated properly and doesn’t have some kind of huge crack.

This would be a great idea, since he could have a clogged cat (and this would immediately confirm) - that would definitely cause the symptom & is more likely than the turbo at this point
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Old 11-04-2021, 03:33 AM   #50
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This would be a great idea, since he could have a clogged cat (and this would immediately confirm) - that would definitely cause the symptom & is more likely than the turbo at this point
No clogged cat. The car passes SMOG with no problem with flying colors.
I'm thinking perhaps its time for a new turbo.
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