How much boost can the VF11 put out safely?
Moderators: Helpinators, Moderators
-
- In Neutral
- Posts: 30
- Joined: Sat Jun 21, 2008 4:30 am
How much boost can the VF11 put out safely?
I have seen this thing push like 25 psi and I always thought that they are way too small. I will get and IC some time so I can push 13 psi. stock everything except the cold air intake. THis is also my DD so I dont need a crazy set up.
-
- Knowledgeable
- Posts: 3335
- Joined: Wed Feb 16, 2005 9:40 pm
- Location: Oregon
The biggest problem with the VF11 is that it cannot maintain the boost at higher RPM's. Once you hit the 12-13psi range you can just watch it taper off back down to 11 above 4000 RPM.
The other issue you will run into with the stock setup - and it drives me just mad as I'm in the same boat - is that your MAF maxes out around 13psi. Once your MAF maxes out, your injectors go wide open from which there really isn't much good that can be had.
The other issue you will run into with the stock setup - and it drives me just mad as I'm in the same boat - is that your MAF maxes out around 13psi. Once your MAF maxes out, your injectors go wide open from which there really isn't much good that can be had.
Lee
93' SS, 5mt swapped, 182k, not stock...
96' N/A OBW 5sp, 212k, Couple mods... RIP
99' N/A OBW, 4eat, mostly stock.
93' SS, 5mt swapped, 182k, not stock...
96' N/A OBW 5sp, 212k, Couple mods... RIP
99' N/A OBW, 4eat, mostly stock.
-
- First Gear
- Posts: 173
- Joined: Fri Aug 08, 2008 5:16 am
- Location: Pueblo CO
-
- First Gear
- Posts: 81
- Joined: Tue Dec 25, 2007 9:42 am
Efficiency drops off after about 1 bar. The lower the efficiency, the more heat is generated.
Basically the compressor wheel is small - so to push high pressure it has to spin quite fast. Around 130,000 to 160,000 RPM for pressure's above 1.5 bar. The result is high temperatures. This WILL shorten the life of the turbo, and does bad things to your oil.
Basically the VF11 is a really poor choice for anything over 1 bar. It's not designed for high speeds like that, it's not ball bearing, and it's not rebuildable.
GD
Basically the compressor wheel is small - so to push high pressure it has to spin quite fast. Around 130,000 to 160,000 RPM for pressure's above 1.5 bar. The result is high temperatures. This WILL shorten the life of the turbo, and does bad things to your oil.
Basically the VF11 is a really poor choice for anything over 1 bar. It's not designed for high speeds like that, it's not ball bearing, and it's not rebuildable.
GD
91 SS, 94 GT, 84 Wagon, 83 Hatch, 85 Brat.
-
- Knowledgeable
- Posts: 3335
- Joined: Wed Feb 16, 2005 9:40 pm
- Location: Oregon
-
- First Gear
- Posts: 81
- Joined: Tue Dec 25, 2007 9:42 am
I've bought a rebuild kit for the vf11 came with new bushings and everything.GeneralDisorder wrote:You can't buy kits that I'm aware of. You can replace the seals but that's all I've ever seen. The dealer says they aren't serviceable, and so does deadbolt.555BCTurbo wrote:Where did you get that idea?
GD
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
-
- First Gear
- Posts: 81
- Joined: Tue Dec 25, 2007 9:42 am
I don't recall off the top of my head, but I picked it up on ebay I believe for about $100.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
-
- First Gear
- Posts: 173
- Joined: Fri Aug 08, 2008 5:16 am
- Location: Pueblo CO