Making the LS4 TB driveable
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Joined: 09-28-08
Posts: 236
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From: Flint Mi
thats not really true, but the guy you're responding to is definitely confused, becasue the LS4 and the LSJ TB DO use the same wiring.
To explain to the confused guy, the area scalar tells the ECM when the throttle is open X%, what volume of air should be flowing through it. If it expects X CFMs at 10% throttle, but is seeing 1.5X CFMs at 10% (since the larger TB will flow more at the same throttle percentage), it can do many things, including at the extreme thinking there is a vacuum leak, and put you in limp mode.
If you tell the ECM the TB is bigger than it really is, it will open the throttle less per the same pedal travel since it is trying to get X CFMs at Y pedal travel.
I hope this made sense....And I hope what I said is accurate, but this is my understanding how it works.
To explain to the confused guy, the area scalar tells the ECM when the throttle is open X%, what volume of air should be flowing through it. If it expects X CFMs at 10% throttle, but is seeing 1.5X CFMs at 10% (since the larger TB will flow more at the same throttle percentage), it can do many things, including at the extreme thinking there is a vacuum leak, and put you in limp mode.
If you tell the ECM the TB is bigger than it really is, it will open the throttle less per the same pedal travel since it is trying to get X CFMs at Y pedal travel.
I hope this made sense....And I hope what I said is accurate, but this is my understanding how it works.
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