PRattenbury
Neophyte
- Joined
- Jan 28, 2007
- Messages
- 1,095
I sure am glad to have my truck back. I'm pretty sure sliding the plate all the way back, AFC housing all the way back, and not letting the AFC move till 20PSI or so will not be one of those things that causes the pump to bind, correct? With the plate set midway and the AFC disconnected, I still have too much fuel to run on the street. I'm runnng a 64/71/13 as a single for now. I figured the thing would be screaming its guts out with the fuel I have. Not true. When I had my Towing Twins (PS62/K31) I could get 40 or so PSI boost at WOT. With the 64 as a single I could only manage 20 pounds. When I had the motor built I did so with maximum airflow in mind. The valves are bigger, the head is ported, the cam is huge... Anyway, this is the second turbo configuration I've had on it, so I think the turbo side of the boost factor can be eliminated as a cause of low boost. I have the waste gate disconnected on the 64. On the intake side of things, I do have the ZZ Fab manifold as something unusual, but the IC tubes, air horn and so forth is all stock, with heavy boots and clamps. The IC itself is a Cool Twist and it's only got maybe 1000 miles on it. I'm nearly inclined to just accept the possibility I just have great air flow through the motor and call it good. Once I get the RPMs to come up (through great care with the skinny pedal) I do get to where I hit the governor pretty quick somewhere north or 3000, and it runs silky smooth up there. Does it seem reasonable the engine could flow air so well I'd have boost numbers this low?