http://autospeed.com/cms/A_111111/artic ... ticle.html
Special added attraction:http://autospeed.com/cms/A_110...ticle
http://autospeed.com/cms/A_109402/article.html
My favorite instrument
-
goody90q45
- Posts: 3679
- Joined: Wed Aug 17, 2005 2:07 pm
- Car: 1992 Infiniti Q45 (sold)
- Location: Orangevale, CA
Re: My favorite instrument (Q45tech)
Excellent articles, especially the second one you listed (Part 1). The concept of flow restriction and how to measure it was explained very well.
I think I know where I can get ahold of a Magnahelic gage or two.
I think I know where I can get ahold of a Magnahelic gage or two.
-
Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: My favorite instrument (goody94q45)
Over the years I've purchased 7 from ebay. 10" to measure before MAF, 20" to measure before TB plate. 1", 3", 10, 15" 20, 30, 100"
27.7" H2O = 1.00 psi
I have installed a measurement port in center top of air filter housing ~~ 7" at peak rpm, the MAF is 7" so 14" the hose to TB is 2" so 16" the TB is 2" so 19-20" to plenum with WOT.
Careful if you exceed the peak reading capacity of manometer [by much] it will suck out the diaphram and instantly destroy the unit.
You can rig a vacuumswitch/solenoid so that the vacuum path only works at WOT [use voltage from kichdown switch or just a manual if you remember to open when you let off throttle.
20" HG [cruise/idle vacuum ] is 9.8 x 27.7 = 272 " H2O .....14x greater
DON'T be confused by the numbers/test of the turbo which is 2-3x more sensitive to restriction on its inlet than a non turbo engine.
Reducing the Q45 losses from 7" to 2" [K&N cone] only seems to add 2-3 HP at best in cold weather.
27.7" H2O = 1.00 psi
I have installed a measurement port in center top of air filter housing ~~ 7" at peak rpm, the MAF is 7" so 14" the hose to TB is 2" so 16" the TB is 2" so 19-20" to plenum with WOT.
Careful if you exceed the peak reading capacity of manometer [by much] it will suck out the diaphram and instantly destroy the unit.
You can rig a vacuumswitch/solenoid so that the vacuum path only works at WOT [use voltage from kichdown switch or just a manual if you remember to open when you let off throttle.
20" HG [cruise/idle vacuum ] is 9.8 x 27.7 = 272 " H2O .....14x greater
DON'T be confused by the numbers/test of the turbo which is 2-3x more sensitive to restriction on its inlet than a non turbo engine.
Reducing the Q45 losses from 7" to 2" [K&N cone] only seems to add 2-3 HP at best in cold weather.