3S-GE ACIS/Beams discussion, Discussion about ACIS, TVIS, VVT-i, etc. applicable to 3S-GE motors Options

[delusionz]

thats alright

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.

[BonzaiCelica]

i was taking a look on Fujitsubo japan website for the Header power gains for the Celica/MR2 3rd gen 3sge and it was a 5.1ps increase while the Integra Type R DC2 was a 5.9ps increase. So with a 3sge Beams Redtop you can anywhere in that range. Fujitsubo LEGALIS R MAKES 3.9PS as a bolt on system after catalytic converter for the 3rd gen 3sge. Could be a bit more for the 4th gen 3sge I'm sure.

Also the stainless header will increase exhaust noise by 4db and lists that the Super Ex Fujitsubo Header and Bpipe weighs 9.1kg = 20 lbs. I wonder what the stock header and bpipe weighs??

Stock Header and Bpipe on SW20 = 15kg, Fujitsubo Header and Bpipe on SW20 = 11kg(they include a bolt on heat shield for SW20). So a 8.82 pound weight loss.


So a Fujitsubo Legalis R header, de-cat pipe and Fujitsubo legalis R exhaust. you can see a 11-13ps (depending on 3rd or 4th generation 3sge) increase. not bad. A straight through muffler like HKS or Kakimoto might be a bit more but not much.

This post has been edited by BonzaiCelica: Feb 10, 2016 - 2:27 PM