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| Adjusting the boost of our factory Turbo's http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=14266 |
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| Author: | OzLtd [ Wed Nov 08, 2006 5:27 am ] |
| Post subject: | Adjusting the boost of our factory Turbo's |
Anyone done yet ? Our KJ's come with a vacuum operated boost control fixed to the actuator right ? I noticed that just underneath the actuator there is a little adjusting nut thingy ?, fixed to the shaft that goes from the actuator to the internal wastegate. You have to remove the radiator overflow bottle and factory heat shield to see it/get to it. Anyone played with it yet ? |
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| Author: | TDI4BY [ Wed Nov 08, 2006 4:27 pm ] |
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You first!
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| Author: | OzLtd [ Wed Nov 08, 2006 7:44 pm ] |
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TDI4BY wrote: You first!
I see....... 
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| Author: | oldnavy [ Wed Nov 08, 2006 8:03 pm ] |
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It is controled by a computer chip, you can pay some big bucks to get it tweaked. But you just can't pull it open like you have talked about, it has to be a controlled process so as not to blow your engine or turbo. |
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| Author: | DarbyWalters [ Wed Nov 08, 2006 8:53 pm ] |
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Most ( not all ) "variable vane/nozzle" turbos do not have a "wastegate" like you are thinking. Since the vanes/nozzles change pitch/volume, it takes care of itself for the most part. You can have a watsegate on a VVT/VNT to protect it at top boost but it is controlled electronically for the most part. So as oldnavy said, you need something like InMotion Tuning to do a custom computer upgrade to dial in your turbo boost. |
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| Author: | RFCRD [ Wed Nov 08, 2006 11:08 pm ] |
| Post subject: | Re: Adjusting the boost of our factory Turbo's |
OzLtd wrote: Anyone done yet ?
Our KJ's come with a vacuum operated boost control fixed to the actuator right ? I noticed that just underneath the actuator there is a little adjusting nut thingy ?, fixed to the shaft that goes from the actuator to the internal wastegate. Bad move. That rod controls the variable pitch of the turbine blades and is adjusted to the range of motion of the vaccuum pot that is controlling this mechanism. There is no wastegate. |
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| Author: | no-blue-screen [ Thu Nov 09, 2006 2:48 am ] |
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I guess I will echo what everyone else is saying....and I will add that even if you could make some type of manual adjustment, it would throw a CEL for an overboost condition since the amount of boost would be out of the range that the ECM is expecting. In short, bad idea to try and adjust it manually and as everyone else has stated this would need to be done with a chip tune. |
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| Author: | OzLtd [ Thu Nov 09, 2006 5:00 am ] |
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Good info, thanks guys. I still dont understand the "no wastegate" comment ? I thought every turbo has a waste gate to relief backpressure ie boost (or overboost) I've heard a million times a wastegate style noise coming from under my bonnet, I would swear it black and blue.
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| Author: | no-blue-screen [ Thu Nov 09, 2006 5:09 am ] |
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Someone will correct me if I am wrong, but this is the difference. Older turbos had a wastegate that would open to, as you said, release excess boost. The new VVT turbos have an actuator that operates several vanes to control boost. See more on turbos here: http://en.wikipedia.org/wiki/Variable_g ... rbocharger http://en.wikipedia.org/wiki/Turbo |
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| Author: | murf [ Thu Nov 09, 2006 6:13 am ] |
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My 92 6 liter Cummins ain't got no waste gate. Neither does my wifes 06 Libby. For different reasons, obviously. The VVT (Variable Vane Turbo) or VGT (Variable Geometry Turbo) Does what was stated earlier and, takes care of itself. Meaning, if the ECM senses the need for more boost, then it physically changes the impeller blades in the turbo to produce more boost. if it senses it needs less, it changes to produce less. And as far as wastegates go. They are really nothing more than a fancy name for a pressure relief valve. Meaning, if you produce too much pressure (boost) they will release excess pressure back to a "safe" pressure. Now, the reason my 92 Cummins don't have/need a WG is because it was designed to really never need it. No matter the amount of fuel being dumped, it should never overboost. The Libby, of course has the VVT which is controled by the ECM. so it should never overboost either. Hence no need for a wastegate. I'm hoping this makes sense after 7 Budweisers! Someone correct me if I'm wrong. |
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| Author: | Drewd [ Mon Nov 13, 2006 2:12 pm ] |
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If mess with the actuator rod length, you may possibly get a check engine light or go into limp mode if the sophisticated electronics determine that boost is outside of an expected variable. This is a theory andI can could be wrong. |
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| Author: | DZL_LOU [ Mon Nov 13, 2006 2:17 pm ] |
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OzLtd wrote: Good info, thanks guys.
I still dont understand the "no wastegate" comment ? I thought every turbo has a waste gate to relief backpressure ie boost (or overboost) I've heard a million times a wastegate style noise coming from under my bonnet, I would swear it black and blue. The turbos employed in the CRD are supplied by Garrett which was purchased by Honeywell. Plenty of technical reading at the following site. It's good tutorials. http://www.turbobygarrett.com/turbobygarrett/tech_center/tech_center.html |
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| Author: | no-blue-screen [ Mon Nov 13, 2006 2:19 pm ] |
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Basically, there is very little on new cars that you can fool with or adjust without having a CEL or some other malfunction. Mine has plenty of power for my liking and I don't want to take a chance on the warranty so I will leave mine alone. |
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| Author: | gd5092 [ Mon Nov 13, 2006 10:24 pm ] |
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Curious actually how many inches of pressure the Turbo actually raises over ambient pressure when at max boost. Anbody has the specs from manual maybe ?. -Gab |
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| Author: | CATCRD [ Tue Nov 14, 2006 1:00 am ] |
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It's about 25psi. |
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