upgradeing the throttle body
upgradeing the throttle body
I did a search in g35/37 forum as well as the mechanic forum but nothing was about upgradeing. I just read an article about the "Endless Z" using a VK45 throttle body. Would this work on a 2003 G35? I already have an aftermarket plenum and intake w/ztube. Would this be too much air? The car is N/A. Thanks.
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Q45tech
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- 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: upgradeing the throttle body (pae9132)
Important to understand the PHYSICS of automobile engines.
Why would a manufacturer/engineer intentionally use an undersized TB.
You can measure the air pressure drop across the TB to determine the pressure loss........................generally it is less than 5" H2O or 1/6 of a psi which leaves 1/6 x 6.8% or 1.13% of the peak power on the table.
On a 270HP engine that is <3 HP lost....................however a significantly larger one might only gain 1, 1.25, maybe 1.5 HP.
The larger the diameter the less fine response you get so the engine is more difficult to idle and cruise at low rpms.
Remember the Earth's giant supercharger supplies a constant pressure to the system ~~~14.7 psi.........................measure your WOT plenum pressure to see how much of this is lost.
Why would a manufacturer/engineer intentionally use an undersized TB.
You can measure the air pressure drop across the TB to determine the pressure loss........................generally it is less than 5" H2O or 1/6 of a psi which leaves 1/6 x 6.8% or 1.13% of the peak power on the table.
On a 270HP engine that is <3 HP lost....................however a significantly larger one might only gain 1, 1.25, maybe 1.5 HP.
The larger the diameter the less fine response you get so the engine is more difficult to idle and cruise at low rpms.
Remember the Earth's giant supercharger supplies a constant pressure to the system ~~~14.7 psi.........................measure your WOT plenum pressure to see how much of this is lost.
Re: upgradeing the throttle body (Q45tech)
thanks. I'll just stay with the stock t/b