Variable Geomeetry Turbo on EVO?
Dec 14, 2007, 06:26 AM
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Additionally, VGT turbos are still, as far as I know, not quite advanced enough to handle the higher EGT's of gasoline engines, since they have mostly been used on diesel applications so far. I think within the next couple years the vane materials will get more durable and be usable for gas applications. Porsche actually just released a twin VGT turbo gas powered car but they had to do all their own R&D on the turbo technology to handle the heat.
Dec 17, 2007, 04:31 AM
#4
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^Eh? The Porsche 997 Turbo uses VGT, so I think the VGT would be Ok for our Jap taxis, however getting a turbo for a decent price might be more tricky.
One of the guys on the Mitsubishi Lancer register was looking in to this, the boost control is done by varying the pressure supplied to the vane actuator, so some kind of solenoid setup should do. The main trick would be sourcing a turbo with the correct characteristics and getting it to fit.
MB
One of the guys on the Mitsubishi Lancer register was looking in to this, the boost control is done by varying the pressure supplied to the vane actuator, so some kind of solenoid setup should do. The main trick would be sourcing a turbo with the correct characteristics and getting it to fit.
MB
Last edited by burgers22; Dec 17, 2007 at 04:35 AM.
Dec 17, 2007, 05:08 AM
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Actually these were first used on little Dodge Omni's if memory serves.
We run VNT on the rally car as it's stock on the VW TDI as well as most modern diesels. We have seen rather high EGTs in the 1500+ deg f range under race conditions without ever having one VNT failure. As a matter of fact I can't recall ever seeing any heat related problems with VNT but have seen them sooted up and jammed but those are on customer cars who tend to baby their TDIs way too much.
I don't know if many folks would ever get the EGTs high enough long enough in a street car to melt anything but folks who track may run into some problems. The big upside is that with Porsche now putting VNT turbos on their cars you can be sure that the technology WILL stand up to the abuse as they simply won't install it if it will not stand up to the rigors of open track beatings.
As for control, its honestly not as bad as you may think. I've floated the idea of testing some VNT turbos on the Buschur boards but nobody has snapped up on it yet. I would be happy to get some of the folks from the diesel community who specialize in such things to lend a hand to folks who wanted to make this work on a 4G63, just gotta find the right folks with the time and motivation.
As for the right turbos, I think that Garrett makes VNT versions of their turbos up through 35 series and larger. I also know they are touting the use of VNT in gasoline powered performance applications.
In short I think the variable geometry turbos could be a true god send to the Evo community and think there is a good chance that in a year or so with some work we could be seeing turbos that spool like a Green but blow on the top end as well as a 35R. Maybe better.
We run VNT on the rally car as it's stock on the VW TDI as well as most modern diesels. We have seen rather high EGTs in the 1500+ deg f range under race conditions without ever having one VNT failure. As a matter of fact I can't recall ever seeing any heat related problems with VNT but have seen them sooted up and jammed but those are on customer cars who tend to baby their TDIs way too much.
I don't know if many folks would ever get the EGTs high enough long enough in a street car to melt anything but folks who track may run into some problems. The big upside is that with Porsche now putting VNT turbos on their cars you can be sure that the technology WILL stand up to the abuse as they simply won't install it if it will not stand up to the rigors of open track beatings.
As for control, its honestly not as bad as you may think. I've floated the idea of testing some VNT turbos on the Buschur boards but nobody has snapped up on it yet. I would be happy to get some of the folks from the diesel community who specialize in such things to lend a hand to folks who wanted to make this work on a 4G63, just gotta find the right folks with the time and motivation.
As for the right turbos, I think that Garrett makes VNT versions of their turbos up through 35 series and larger. I also know they are touting the use of VNT in gasoline powered performance applications.
In short I think the variable geometry turbos could be a true god send to the Evo community and think there is a good chance that in a year or so with some work we could be seeing turbos that spool like a Green but blow on the top end as well as a 35R. Maybe better.
Dec 18, 2007, 07:43 PM
#7
VNTs are very well developed for the diesel market and just being developed for gasoline. Borg Warner makes the turbos for the 911 turbo. They're too small for anything though, unless you use both of them.
There are a couple 240sx guys that have used VNTs off of the diesel Powerstrokes for tens of thousands of miles. They seem to hold up for short bursts but I wouldn't push them too hot for too long.
The control system for the actuator for the vanes is quite simple. Heck, the stock ecu can probably be hacked to control it (instead of the boost solenoid).
There are a couple 240sx guys that have used VNTs off of the diesel Powerstrokes for tens of thousands of miles. They seem to hold up for short bursts but I wouldn't push them too hot for too long.
The control system for the actuator for the vanes is quite simple. Heck, the stock ecu can probably be hacked to control it (instead of the boost solenoid).
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Dec 18, 2007, 09:33 PM
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That's interesting, no joke, I thought about this before the new Porche was released but I figured, "yea, right, a mod like this"? Would be awsome to see if someone could pull it off.
Jan 30, 2024, 01:35 PM
#12
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holy thread revival, like how did you even find this..
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