3S-GE ACIS/Beams discussion, Discussion about ACIS, TVIS, VVT-i, etc. applicable to 3S-GE motors |
3S-GE ACIS/Beams discussion, Discussion about ACIS, TVIS, VVT-i, etc. applicable to 3S-GE motors |
Sep 13, 2008 - 11:05 PM |
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Enthusiast Joined Feb 11, '08 From Auckland, New Zealand Currently Offline Reputation: 0 (0%) |
thats alright QUOTE how would i go about modding my ACIS? rather than tell you how to mod it heres a way how not to mod it http://toymods.net/forums/showthread.php?t...;highlight=ACIS (also I recommend a new thread for 3SGE ACIS/Beams discussion) I've been playing around with ACIS recently and I've discovered a few things about it, The basics ... when the vacuum diaphragm pulls the throttles, the larger diameter in the corner of the inlet pipes open up (under the lid) for high rpm and when there is no vacuum to pull the throttles are free to return to the constricted low rpm position. A few problems noted with ACIS: 1. When switching between high and low rpm modes, the vacuum diaphragm sometimes get stuck in the high rpm mode 2. The engage point is too late First experiment was to see how the car behaved with the throttle pull lever tied up with cable ties as to lock the throttles in the high rpm position, What I observed with the butt dyno was that under full throttle the rpm range where the car would "suddenly get up and go" was lower down, noticed in terms of road speed 65kph before, 55kph after (2nd gear) so in other words 5000-7000 was the get up and go range, without ACIS constriction in the intake the get up and go range was observed from 4000 to 7000. No loss in acceleration was noticed from idle to 3000 under part throttle, but loss was noticed under full throttle, between 3000 and 4000 I couldn't tell either way in neither part throttle nor full throttle whether ACIS was better in low rpm or high rpm mode.... This suggests to me that 4000 is a better changeover point than 4800 for performance. 4800 is an rpm not reached by normal driving due to speed limits & gear selection thus ACIS seems to exist for the purpose of keeping intake noise down at legal road speeds rather than for improving low rpm torque as midrange torque takes a hit with this setup. My proposed solution on how TO mod the ACIS, is to gutt the vacuum actuator system and replace it with a motorised cable pulling actuator triggered by a frequency switch relay at 4000 rpm the signal could be obtained by the ignitor right behind there. -------------------- Mike W
1996 Toyota Celica ST205 GT-FOUR GT2860RS turbine, TiAL mvr44, JE 86.5φ piston, Clutchmasters FX400, APEX P-FC 269awhp / 273ft-lbs |
Sep 29, 2008 - 6:39 AM |
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Enthusiast Joined Feb 11, '08 From Auckland, New Zealand Currently Offline Reputation: 0 (0%) |
ACIS Modification project
------------------------------- Parts required: A spare vacuum solenoid valve, some length of automotive wire, and this Jaycar kit (Frequency Relay Switch) --- Soooooo.... The standard engage point for ACIS is roughly 4800 RPM, the point where it goes niiiiiiiiiiiiiiiiiiiiiiiiiBWARRRRRRRRRRRRRRRRRRRR, in 2nd gear and the tachometer lunges past the 5k mark (65kph) and the car gains speed as though the pedal wasnt floored before but now it is.... Now that my custom ACIS RPM-adjustable controller project is complete, I set out to test it out at a tiny bit over 4k... And the results are amazing.... the same speed jump at the 5k mark is observed at the 4k mark (52kph).......... I've recorded a video which I think demonstrates this (not dyno proof, but judge for yourself)... Sorry about the first 30 seconds of engine braking, the rest of it is a motorway run testing out the 4k engage point with 2nd and 4th gears.... 2nd gear 4k is 55kph, 4th gear 4k is 110kph notice the speed jumps at .... (with the video timer counting down) -00:45s. -00:27s, -00:17s This post has been edited by delusionz: Sep 29, 2008 - 6:40 AM -------------------- Mike W
1996 Toyota Celica ST205 GT-FOUR GT2860RS turbine, TiAL mvr44, JE 86.5φ piston, Clutchmasters FX400, APEX P-FC 269awhp / 273ft-lbs |
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