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 |
|
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 |
Aug 16, 2009 - 2:39 AM |
|
Moderator Joined Nov 5, '07 From New Zealand Currently Offline Reputation: 3 (100%) |
QUOTE thats not true, the gen 4 is not a gen4 type with variable cam timing, its a completely different head, nothing between them is compatible, the cam angle is different, the conbustion chamber is completely different , the valves in the beams are bigger as are the buckets. I have one sitting here in bits if an illustration is needed. There are tuning options for the redtop, i see the name gbooth mentioned, he is the guy to talk to, you can get hold of him through the beams redtop forum and he will supply you with anything you need to tune a redtop or blacktop beams. Cams are not compatible between the red and blacktop though. Its well worth retaining the vvti when tuning it aswell. Theres a 240whp redtop in a gen 5 celica that mr booth built, peak power is at 8600rpm . Theres a lot to be gained from just an aftermarket ecu aswell, my freinds mr2 is putting out 183bhp@7000rpm at the wheels with just intake + decat and ecu. just wondering if you ment "thats not true, the gen 4 is not a gen3 type with variable cam timing" I know what your saying, (its just not a gen 3 head painted red) yes it is differnet, but I think what they were simply trying to say was its similar to the 3gen but close up there are quite a few difference as you point out. by all means post up pics really need more info on here, as there isn't too much floating around, (I can hopfully find the 3gen sizes etc to compare) one thing I really would like to know are the camshaft sizes (duration and lift) and if you have any more info on the redtop beams ive missed please post it up delusionz im not to sure, NA require it as this is how they make their power (which is why a 3gen can run up to +300deg cams) -------------------- |
Lo-Fi Version | Time is now: August 5th, 2024 - 5:33 PM |