Throttle Body Swap
01-01-2006, 12:16 PM
#1
TECH Addict
Thread Starter
Join Date: Jun 2002
Location: Las Vegas, NV
Posts: 2,428
Likes: 0
Received 0 Likes
on
0 Posts
Throttle Body Swap I was wondering if I was to switch out my stocker, what parameters would have to be retuned? I had someone tune my cammed idle, and I don't want to mess with it, so would a ported or aftermarket TB change the idle? Do you usually have to add fuel too? Thanks.
01-01-2006, 05:24 PM
#3
TECH Addict
iTrader: (10)
Join Date: Jun 2004
Location: Commerce Twp, MI
Posts: 2,918
Likes: 0
Received 0 Likes
on
0 Posts
There's a table or two that reference desired vs. actual airflow in grams/sec. The tables convert that data to 'steps' for the IAC, which is what opens/closes your TB blade when your foot is off the gas (to control idle rpm). When you drill or port your throttle body, this changes how many grams/sec are equal to the factory programmed number of steps. Therefore, the IAC thinks it is supplying less airflow than it actually is. This causes slight surging/hunting for the right idle speeds, which can also cause the car to stall.
