Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post

Def · 06-19-2008, 08:47 PM

S13 banjo bolts definitely have a restriction built into them. 0.060" is fine for a BB CHRA even if it is a bit over Garrett's recommended orifice diameter.

Honestly, I wonder if they've done an instrumented test on their 0.030" claim. That will SEVERELY drop the pressure going to the CHRA, such that I doubt it ever gets anywhere remotely close to their maximum seal pressure of 20-25 psi. Maybe the operating range is lower, which would make sense, but in my "day job" I've seen lots of engineers just do a quick little CFD on their desktop and it's about as close as trying to piss 30 ft into the wind.

06-19-2008, 08:47 PM	#6
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16)	S13 banjo bolts definitely have a restriction built into them. 0.060" is fine for a BB CHRA even if it is a bit over Garrett's recommended orifice diameter. Honestly, I wonder if they've done an instrumented test on their 0.030" claim. That will SEVERELY drop the pressure going to the CHRA, such that I doubt it ever gets anywhere remotely close to their maximum seal pressure of 20-25 psi. Maybe the operating range is lower, which would make sense, but in my "day job" I've seen lots of engineers just do a quick little CFD on their desktop and it's about as close as trying to piss 30 ft into the wind.