Ive had Mark's 3794 for about 4years now. Its been a great little charger, but I wanted to try a fixed vane. I went with WCfab's kit (s364.5sxe x 73mm .91ar), and have only drove it about 75miles or so.
The kit fits very nicely. I wish they would have sent some directions along to simply speed the process up a bit. However, though time consuming, it went fairly smooth.
The first thing I noticed while cruising at 67mph is how free the truck felt. Guys with VGT chargers know that feeling when the vanes are at a higher % and it has a choke effect on the engine. I made my tunes run very little cruising boost for that reason, and mpg went up from it etc.. This charger has the feel of a VGT with the vanes open at 0%, yet carries 2-3psi of boost! My egts are down 50-75* cruising and on average my calculated fuel rate seems to be lower by 3-5mm3. I'm guessing my mpgs will be better, but time will tell. The sound is so amazing. I loved the vgt whistle, but the growl and snort the fixed vanes has is unlike anything else. I have a 1074 from Evan, which he normally says is a no-go for fixed vane chargers, but it lights surprisingly well from a stop. I did change my pedal to torque tables a bit to raise my shift points, and that seemed to do it some justice. I actually had to take some out originally because it lit better than expected. I can even make almost 2psi of boost at 1300rpm's cruising. It definitely doesn't spool like the vgt, but I'm very impressed. Cruising at 2000rpms I was seeing 3-4psi, and the charger seemed very responsive. I'm thinking this turbo should tow pretty dang well. Below 1800rpms might be interesting, but I bet it is doable. I'll be towing my 15k trailer in the next week or two, so I'll get an idea of how efficient this charger is under 1800rpms towing.
I can't stress enough how effortless it now cruises. EGTs are around 580-630* on flat road at 67mph and barely breaks 700* over moderate hills. My vgt hung around 670+ almost all the time at the speed and saw much higher egt spikes over hills. Not saying my boost tables were spot on, but I've had 3 years of playing with it so I wouldnt think I was that far off. If anyone is on the fence getting a fixed vane, dont be! Its expensive, but if you have the cash it is well worth it.
When I get concrete data I'll report back.
The kit fits very nicely. I wish they would have sent some directions along to simply speed the process up a bit. However, though time consuming, it went fairly smooth.
The first thing I noticed while cruising at 67mph is how free the truck felt. Guys with VGT chargers know that feeling when the vanes are at a higher % and it has a choke effect on the engine. I made my tunes run very little cruising boost for that reason, and mpg went up from it etc.. This charger has the feel of a VGT with the vanes open at 0%, yet carries 2-3psi of boost! My egts are down 50-75* cruising and on average my calculated fuel rate seems to be lower by 3-5mm3. I'm guessing my mpgs will be better, but time will tell. The sound is so amazing. I loved the vgt whistle, but the growl and snort the fixed vanes has is unlike anything else. I have a 1074 from Evan, which he normally says is a no-go for fixed vane chargers, but it lights surprisingly well from a stop. I did change my pedal to torque tables a bit to raise my shift points, and that seemed to do it some justice. I actually had to take some out originally because it lit better than expected. I can even make almost 2psi of boost at 1300rpm's cruising. It definitely doesn't spool like the vgt, but I'm very impressed. Cruising at 2000rpms I was seeing 3-4psi, and the charger seemed very responsive. I'm thinking this turbo should tow pretty dang well. Below 1800rpms might be interesting, but I bet it is doable. I'll be towing my 15k trailer in the next week or two, so I'll get an idea of how efficient this charger is under 1800rpms towing.
I can't stress enough how effortless it now cruises. EGTs are around 580-630* on flat road at 67mph and barely breaks 700* over moderate hills. My vgt hung around 670+ almost all the time at the speed and saw much higher egt spikes over hills. Not saying my boost tables were spot on, but I've had 3 years of playing with it so I wouldnt think I was that far off. If anyone is on the fence getting a fixed vane, dont be! Its expensive, but if you have the cash it is well worth it.
When I get concrete data I'll report back.
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