Variable Geometry Turbo?

[KyleJ]

Well guys long story short I have a pretty big past in diesel trucks. I happened to come across my GSX from a friend that needed quick cash and I've found that I really do enjoy these little machines!

My question is, I have access to a couple newer Dodge VGT's. I am in the process of devising a way to control the vanes, but what kind of tuning curve will this be throwing in to my setup? I will be tuning on DSMlink 2.5, but is there any way to make it a linear setup or will I have to completely start from scratch since the vanes will be changing pitch with engine load/rpm?

Any input or suggestions are appreciated, or anyone that has run a VGT on one of these cars feel free to chime in! Once again I'm trying to do something different.

Thanks guys,
-Kyle

 

[tenn-gsx]

Well this has been done with the Ford turbos already. The guys who did it before just used a wastegate actuator set at a certain boost to open the exhaust vanes up.

 

[KyleJ]

I assume the guys that have done it already are using the 6.0 Powerstroke turbos...

What kind of gains are these guys seeing? (Time to do some searching!) I am planning for when I upgrade my setup over winter, just trying to get a shake down on the car with a 16g and trying to familiarize myself with these cars before I dive into a build. My main goal is a 12 second daily driver full weight 2g, If it runs 12.99's I'll be happy! I am just trying to explore my options before I slap a 20g or similar turbo on it. I'm always trying to be 'different' I guess!

 

[tenn-gsx]

Well figure out the peak airflow within efficiency range of the turbo at lbs per min. Times the lbs per min by 9 or 10 and that will give you roughly what hp the turbo is capable of on our cars if tuned properly.
The variable vane or variable geometry helps spool the turbo faster is all. So you will have to play with it to find the optimum change over point for your car and tune to get the best results.

 

[proteusx301]

The 6.0 uses a Garret T65 with a unison ring VGT system. I didn't realize you could open them with air pressure reliably. The truck uses oil pressure to move them. Cool info.

 

[LiquidX]

If memory serves right, it's too much work to gain little to no extra spool by using a VGT turbo without the proper controller based from the ECU. you can try to fab something to work but you are better off going with a standard turbo. Not to mention your turbo setup will need to be all customized to fit the turbo there.

 

[silicosys4]

I have questions regarding the heat issue associated with variable vanes/geometry turbo's. From what i know about them, the first VVT for gasoline engines was a very expensive porshe unit on a recent 911 turbo model. If vvt technology were applicable in gasoline engines, wouldn't we have seen one sooner? It is my understanding from reading a few articles about it that only recently have there been advances in alloys sufficient to withstand the exhaust gas temps for gasoline, which are much hotter than in diesels. I'm not contesting that diesel turbo's work, or that they get good results. I'm wondering if anybody can shed light on the durability of vvt diesel turbo's when exposed to much hotter gasoline exhaust?

 

[dsm-onster]

Look up aero_salle. He's running a vgt holset with excellent results in spool and apparently keeps power up in the end of the rev range as well.

 

[JusMX141]

I have questions regarding the heat issue associated with variable vanes/geometry turbo's. From what i know about them, the first VVT for gasoline engines was a very expensive porshe unit on a recent 911 turbo model. If vvt technology were applicable in gasoline engines, wouldn't we have seen one sooner? It is my understanding from reading a few articles about it that only recently have there been advances in alloys sufficient to withstand the exhaust gas temps for gasoline, which are much hotter than in diesels. I'm not contesting that diesel turbo's work, or that they get good results. I'm wondering if anybody can shed light on the durability of vvt diesel turbo's when exposed to much hotter gasoline exhaust?

Really? You revived two older Variable Geometry Turbine threads to post the same exact paragraph?

http://www.dsmtuners.com/forums/hangout/217842-variable-geometry-turbo-question.html#post152514709