stock turbo

[WPeschel]

Has any blown a stock turbo for a 03 HO ctd? If so how and what mods did you have to the engine. . thanks :--)

 

[Summit]

do a search for blown turbo.

several people blew turbo's w/ tst.

 

[mattymac]

It ususally isnt the TST as being the problem though. Its USUALLY caused by not having the wastegate set courrectly to not allow overspeeding and overboosting the turbo. The TST just has the power to do this if the wastegate isnt set correctly. Also the VA duration box has been doing this as well.

 

[SRadke]

All but one that I've hard of were a combination of TST and injectors.



-Scott

 

[GWoody]

"Also the VA duration box has been doing this as well. "





Yup VA got mine but I was stupid, gauges were on back order and temptation got the best of me, no telling what kind of egt or boost I had, won't do that again.

Matty, do you know of others who have lost turbo running the VA duration.

 

[GWoody]

"Also the VA duration box has been doing this as well. "





Yup VA got mine but I was stupid, gauges were on back order and temptation got the best of me, no telling what kind of egt or boost I had, won't do that again.

Matty, do you know of others who have lost turbo running the VA duration.

 

[PGoble]

Originally posted by SRadke

All but one that I've hard of were a combination of TST and injectors.



-Scott

Any idea why the combination is blowing them? Running out of fuel? Accelerating the exhaust wheel to rapidly?



Last Friday I installed the TST and stacked it with the EDGE EZ. I have a DD Jammer turbo along with DD Stage III Injectors, and it blew the turbo within 5 minutes.



I had the Edge on Level 4 and went through the TST HP settings 1-3-5-9, and left the TQ setting on level 3. When I hit level 9, the boost rose to about 25 psi, a big puff of black smoke out of the exhaust, and then I heard the turbo bearing spin. The event took out the bearing on the turbo and spit the exhaust wheel and shaft down into the muffler. The interesting thing was that I wasn't even pushing the truck very hard. Fourth gear and only 25 psi.



I then installed a spare HX-40 that I had in storage, and turned the TST box down to level 1 and drove down to my mechanic. We went out for a test drive and everything ran great. We left the Tq setting on level 3 and started going through the Hp settings listening for anything odd. We started on level 1 and went through the Hp settings one at at time. On levels 3,4,5, the thing was incredible. Set you back in your seat and accelerated like mad up to around 38 psi. When we hit level 7, we had just shifted into 3rd gear and we heard the bearing spin on the turbo, boost was at around 20 psi.



We have been trying to figure out why the higher settings are wiping out the turbo's, but have yet to hear an explaination that explains it. I spoke with TST and they have no idea why it would take out two turbos except that they consider the HX-40 and HX-40 hybrids weak turbos. TST also said that all of the turbo failures that they have had (15 of them) have come from accelerating and then letting off of the accelerator quickly. No blown turbos under steady acceleration like I have had. TST also said that it shouldn't cause any problems to stack the Edge with the PMCR. The only thing that I can come up with is that the combination of Injectors, Edge EZ, and PMCR is calling for more fuel than can be supplied, resulting in a momentary loss of fuel pressure and loss of pressure on the exhaust wheel, then when the fuel supply is restored it reloads the pressure on the exhaust wheel too quickly and spins the bearing. Either that or a glitch in the PMCR programming.



Any thoughts/advise would be appreciated. BTW, TST said that they have heard of no failures with a stock turbo, only failures with larger ones. I. E. HX-40, Jammer, B1, etc.



Peter

 

[Floor It]

I can tell you from experience that its from excessive exhaust heat more that it is from over-boost. I have blown 2 stock turbos, laid the exhaust wheel fins over from too much heat on a B1 and assorted other stuff that is from too much heat.



John

 

[PGoble]

I have my pyro mounted in the exhaust manifold, and it was under 1000 degrees when BOTH turbos blew. That is why I wondered if overspeeding or a programming glitch could be the problem.



peter

 

[GWoody]

Peter





Did you ever figure out what was blowing the turbo???

 

[Greg Boardman-RIP]

If you ran it short on fuel, Which I have done. You would feel a really bad stumble. It feels like the block is being ripped in half. This is a strange situation you are describing. Sounds like the turbos are low on oil... ?. . Something to consider at least.



Greg

 

[MCornwell]

It sounds like to me that on the higher levels with the TST... the



fuel comes on so hard and fast that there is just too much instant



pressure on the turbo, which could very well cause the bearing to



spin ETC... it could be controlled with the right foot but thats no



fun... it explains why the stock power comes on so linear.



My 2 Centavos



-Mitch

 

[PGoble]

Originally posted by GWoody

Peter





Did you ever figure out what was blowing the turbo???

Yes, read below

Originally posted by MCornwell

It sounds like to me that on the higher levels with the TST... the



fuel comes on so hard and fast that there is just too much instant



pressure on the turbo, which could very well cause the bearing to



spin ETC... it could be controlled with the right foot but thats no



fun... it explains why the stock power comes on so linear.



My 2 Centavos



-Mitch

You hit the nail right on the head. After spending many hours speaking with Piers at Piers Diesel (sent one of the turbo's up to him), and Mark at TST, we came to the conclusion that the higher Hp and Torque levels (over 5) on the TST combined with injectors hits so hard that it just spins the bearings. That would explain why when both my turbo's blew, the EGT's were low and the boost was not excessive. The truck began fueling instantly and "chirp", accelerated the turbo too quickly.



Mark at TST has said that they have only had problems with larger turbo's, and that the stock turbo is small enough and strong enough to handle all of the PMCR settings.



Peter

 

[FDavid]

Originally posted by PGoble

... ... TST also said that all of the turbo failures that they have had (15 of them) have come from accelerating and then letting off of the accelerator quickly.....



Peter

It sounds like these turbos are also in major need of a blow off valve (or 2)... just my 2 pesos

 

[Big MAK]

I've been running TST with stock turbo for about 6 mos. No problem; but I don't get crazy either. Towing on 2/2 and running empty at 5/3. Keep that lower number (torque) set at a lower number and it won't come on so hard -- blowing the turbo. Also been running the stock clutch and still no slippage. They'll hold together if you can resist the urge to trounce on it until you're spooled up. Ran with another CTD on I-70 this week; too bad these things peg at 110mph -- we both sat on the governor a while! WooHoo. Hit that speed instantly but that's all the fuel the computer would let it swallow. The way I'm setup temps never went over 1100; even floored at 110mph -- running w/o the trailer of-course!!



Avg mpg with avg speed of 78mph PMCR at 2/2 from Omaha to Effingham and back (no trailer) was about 19. I run the PMCR at lower number of interstate cruising just to keep things smooth. When I get time to do the math I'll give exact numbers.

 

[WPeschel]

Mark at TST has said that they have only had problems with larger turbo's, and that the stock turbo is small enough and strong enough to handle all of the PMCR settings.

:--) OK let me get this right soo the stock turbo will handle the tstpmcr without blowing... . Is that true???? OOO and thanks for all the great info guys. .