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Old 2007-12-20, 04:17 PM   #30
GST Mike
EJ22
 
Join Date: Apr 2005
Location: Hayward, CA
Posts: 191
 
Car: Zee L
 
Load, Efficiency, MAP etc etc etc
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Quote:
Originally Posted by knucklesplitter View Post
I hate to argue the rotated intake manifold thing, especially with Mike advocating it... but how much IC tubing length does that save? What - 2 or 3 feet of 2.75"OD tubing? That's about 200 cubic inches (or about 1/8 cubic foot) of volume. How long does it take for a 400whp turbo to pressurize 1/8 of a cubic foot? That would be the gain in response. 400whp is say 500bhp which is about 500cfm or 8 cubic feet per second for a whopping 0.015 sec reduction in response just SWAGging it. I dunno - there must be something I don't understand. And running speed density (or BTM) there is not the lag time between MAF reading and induction into the cylinders either - that's the thing I don't like about FMIC and its long tubing along with draw-thru MAF.
I can only offer what we see on the dyno which on the same car shows to be a 200-300rpm difference depending on gear and load, also the transient throttle response is greatly improved. This is based off a GT30r running a Hydra tested same day.

Depends on what's worthwhile for people I guess, from a racing standpoint where rule restrictions are in place I'll typically take it where I can get it and with it being a none to costly or timely modification it just makes sense to make the efficiency where ever you can.

Mike
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