Author Topic: Tune+nozzles+surging turbo=BOOM!  (Read 16570 times)

August 17, 2013, 10:49:31 pm

410

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Tune+nozzles+surging turbo=BOOM!
« on: August 17, 2013, 10:49:31 pm »



I guess the vnt 15 couldn't handle all the abuse I've been throwing at it lately.  I've been planning on ordering a vnt 17 for my golf and keep this one as a spare for the wife's car but there's no way this one will ever run again.  
« Last Edit: August 17, 2013, 10:54:18 pm by 410 »


Toyota truck 4x4 with Mtdi, M-vnt gt1749va, 11mm pump, fmic, smog .216 nozzles.  Sold!
Working on 1993 4runner mtdi, gtb1756vk, 11mm pump, smog .216 nozzles, custom 1" thick adaptor plate, pd150 intake manifold.

Reply #1August 17, 2013, 11:50:43 pm

burn_your_money

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #1 on: August 17, 2013, 11:50:43 pm »
Did you remove it with a hammer or is that the way it failed?
Tyler

Reply #2August 17, 2013, 11:55:02 pm

410

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #2 on: August 17, 2013, 11:55:02 pm »
That is the way it failed.  I reached down to remove the spring clamp and the compressor housing moved. 
Toyota truck 4x4 with Mtdi, M-vnt gt1749va, 11mm pump, fmic, smog .216 nozzles.  Sold!
Working on 1993 4runner mtdi, gtb1756vk, 11mm pump, smog .216 nozzles, custom 1" thick adaptor plate, pd150 intake manifold.

Reply #3August 18, 2013, 05:07:47 am

745 turbogreasel

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #3 on: August 18, 2013, 05:07:47 am »
That is one way to lube your linkage.

Reply #4August 18, 2013, 08:31:36 am

theman53

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #4 on: August 18, 2013, 08:31:36 am »
New center section and cold side it could make it LOL

Reply #5August 18, 2013, 09:06:50 am

410

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #5 on: August 18, 2013, 09:06:50 am »
New center section and cold side it could make it LOL
That's if the exhaust housing is untouched.  Vnt-17 has been ordered.  I just hope the intercooler caught all the shrapnel.  I really don't feel like changing the motor out right now.
Toyota truck 4x4 with Mtdi, M-vnt gt1749va, 11mm pump, fmic, smog .216 nozzles.  Sold!
Working on 1993 4runner mtdi, gtb1756vk, 11mm pump, smog .216 nozzles, custom 1" thick adaptor plate, pd150 intake manifold.

Reply #6August 18, 2013, 09:49:07 am

theman53

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #6 on: August 18, 2013, 09:49:07 am »
Did it give any signs of letting go or did it just go boom

Reply #7August 18, 2013, 10:05:36 am

burn_your_money

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #7 on: August 18, 2013, 10:05:36 am »
What tune do you have?
Tyler

Reply #8August 18, 2013, 11:18:10 am

libbydiesel

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #8 on: August 18, 2013, 11:18:10 am »
FWIW, the VNT15 and VNT17 share the same exhaust side and center section (they are actually both gt17XXv turbos).  The compressor is larger on the 17 and my understanding is that it makes it less likely to overspeed but more likely to surge. 

Reply #9August 18, 2013, 07:25:45 pm

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #9 on: August 18, 2013, 07:25:45 pm »
FWIW, the VNT15 and VNT17 share the same exhaust side and center section (they are actually both gt17XXv turbos).  The compressor is larger on the 17 and my understanding is that it makes it less likely to overspeed but more likely to surge.  
I am not sure about the hot sides or the center sections being the same but I have no specs to verify that.  The compressors are different for sure but for some reason I thought the hot side is also bigger.  I'll report back once I get the turbo.  I also have a 1749va kicking around for comparison.

I have a pretty aggressive tune but I don't blame the tune at all.  My drive to work is quite short and even though I drive quite aggressively, I have a problem with vanes sticking in a short period of time.  
« Last Edit: August 20, 2013, 06:26:09 pm by 410 »
Toyota truck 4x4 with Mtdi, M-vnt gt1749va, 11mm pump, fmic, smog .216 nozzles.  Sold!
Working on 1993 4runner mtdi, gtb1756vk, 11mm pump, smog .216 nozzles, custom 1" thick adaptor plate, pd150 intake manifold.

Reply #10August 18, 2013, 07:29:18 pm

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #10 on: August 18, 2013, 07:29:18 pm »
Did it give any signs of letting go or did it just go boom
A few days before I noticed a slight, faint whine at higher boost levels.  It never got worse and actually went away a bit.  And then it just went bang on a second gear pull.  Did you notice that the nut is still on the shaft? ;)
Toyota truck 4x4 with Mtdi, M-vnt gt1749va, 11mm pump, fmic, smog .216 nozzles.  Sold!
Working on 1993 4runner mtdi, gtb1756vk, 11mm pump, smog .216 nozzles, custom 1" thick adaptor plate, pd150 intake manifold.

Reply #11August 18, 2013, 07:48:51 pm

theman53

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #11 on: August 18, 2013, 07:48:51 pm »
From what I have read there are 3 VNT 15 turbos. A 1749a, a 1749b, and a 1749c   or is it va, vb, vc??? I cannot remember, but the 17/22 is as Andrew says. The 3 vnt 15's are pretty much identical, I guess they made small changes in the cold side and that was all. I think the "c" is the one everyone wants for performance. It has been a bit since I read about it, so I could be off on that.

Reply #12August 18, 2013, 09:12:37 pm

libbydiesel

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #12 on: August 18, 2013, 09:12:37 pm »
FWIW, the VNT15 and VNT17 share the same exhaust side and center section (they are actually both gt17XXv turbos).  The compressor is larger on the 17 and my understanding is that it makes it less likely to overspeed but more likely to surge. 
I am not sure about the hot sides or the center sections being the same but I have no specs to verify that.  The turbines are different for sure but for some reason I thought the hot side is also bigger.  I'll report back once I get the turbo.  I also have a 1749va kicking around for comparison.

The turbines aren't different.  The compressors are. 

Reply #13August 20, 2013, 07:41:44 am

RabbitJockey

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #13 on: August 20, 2013, 07:41:44 am »
im thinking maybe he thinks the compressor wheel is the turbine?  easy to mistake
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Reply #14August 20, 2013, 06:21:18 pm

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Re: Tune+nozzles+surging turbo=BOOM!
« Reply #14 on: August 20, 2013, 06:21:18 pm »
No I'm not confusing the turbine with the compressor.  Like I said I'll compare turbos once the vnt17 shows up.  The 1749vb is a little laggy from what I hear so imo the exhaust side is different.  If the only difference is a bigger compressor side then it would be less laggy then the vnt 15.

Edit: Oops, apparently I did mix up the turbine and impeller.  I was thinking compressor and wrote turbine.  The previous post has been corrected.
« Last Edit: August 20, 2013, 06:29:01 pm by 410 »
Toyota truck 4x4 with Mtdi, M-vnt gt1749va, 11mm pump, fmic, smog .216 nozzles.  Sold!
Working on 1993 4runner mtdi, gtb1756vk, 11mm pump, smog .216 nozzles, custom 1" thick adaptor plate, pd150 intake manifold.