After I cut off the flange for the 3 Bolt I measured and the whole is 2 1/8 . The hole for the V band that you weld on to your header is 2 5/8 not sure how much of a difference this is going to make with flow probably not much at all being two different sizes like that .I probably should have gotten a step up in size and welded that first onto my header then to the V band. Yes I know it's not quite centered LOL but it's flat lol
Gulp $700 and one kidney that's with the kit for the V band stainless steel and clamps .for the housing itself I don't know. I got the V Band for the header and one for my downpipe all stainless steel
Waiting to see the back pressure from sackracing
Any new info on this?
I was dicked over and wasnt able to change turbos on the dyno. I have a 7168 on the car now. I know how much co2 it took on the 6870 to make boost, but I also changed intercoolers, so the data might not be accurate.
How much?
It takes 45lbs co2 to make 31psi boost with a 4lbs spring in the gate. Boost in the low 20s, it is 1:1. The back pressure climbs after that.
That's good to know. I'm running a 6466 right now and it's a bit small for my combo. I made a 132mph pass on a very slippery track, I think a 2.1 60 foot, something like that. Ran an 11.0 nonetheless. That was on 23 psi if I remember correctly. For experiment, I cranked it up higher and didn't gain anything after 23 psi. I have 4.6 liters, so a 6870 would probably feed this baby quite well. I'd love to borrow one for experimentation.
That's awesome. I'm on a budget, so a 4 bolt deal is out of the question. I want to keep the same downpipe too. I figure my current combo should trap close to 135 if I open the dump and can get the boost more stable. The 132 pass was through the exhaust. It likes to fall off as the rpm increases, so the graph looks like a saw-tooth. I notice that the boost is more stable with an open dump. Exhaust pressure is something I will look into.
