jong said:That Y-pipe is part of the ACIS system. and both sides are used all of the time. the ACIS control valve is situated in the intake manifold and just moves to change the length of the runners. removing that y-pipe and replacing it with throttle bodies would completely ruin the ACIS effect making it useless.
jong said:sorry to disagree... but thats incorrect.
The 7m-ge does infact have a true ACIS system. The Butterfly valve in the manifold changes the effective length of the intake runners. One mode extends from immediately behind the throttle body with the ACIS control valve closed for long runners. The second mode, with the ACIS control valve open, begins in the middle of the manifold to the runners, short runners. If you would replace the Y-pipe with throttle bodies, you would eliminate the "long runners" that is utilized with the Y-pipe, making it a short runner system. the ACIS control valve would do little to nothing because the shared intake air volume is coming from primarily the same spot.
the 7m-ge has almost the same system as the 2JZ-GE.
Why do you say that the 7mge doesn't have a true acis? It changes the length of the intake runners, which is what ACIS is supposed to do. The system on the 7mge does everything that ACIS does on current toyota models with the ACIS system.
Exactly my POINT... What they did was take the identical IACS system on the 7M and modified it into ACIS.Of COARSE, they are going to change the ACIS system "drastically" on a DIFFERENT ENGINE... I'm sure the Toyota engineers said " oh ok, well, lets take the exact ACIS system from the 7m and throw it on the 2JZ, even though the compression ratios, valves, and pretty much entire air flow through the head is different!"
Wu tang....not to all gang up on you..but dont misinform the public w/o hard cold facts to back you up
I should have inserted a 'not' in that statement. I never preview what I type... I do now though.That statement led me to think you wanted to bolt the throttle bodies directly to the manifold. Which is what you said.... And now you said you don't want to do that?
How is that statement wrong? At 4200 RPM, the valve either stays closed, or opens. Did you read the sentence prior to the one you quoted? I.e...WRONG!! At idle, the valve is always going to be open. At 4200 rpms, if the VTA ( throttle angle) is below 60% then it will close. At 4000 rpms with a VTA of 70% or higher the valve is closed, heck, at 1500 rpms with same VTA the valve is CLOSED, as it passes 4200 rpms, the valve OPENS.AT 4200 RPM, it either leaves the valve closed, or opens it, depending on WOT or not.
The butterfly valve on the 7M-GE is not closed at idle. In order for the system to work as your saying, at it has to close after idle, and then open back up. AT 4200 RPM, it either leaves the valve closed, or opens it, depending on WOT or not.