hey guys, iv got a 1991 MR2 sw20 N/A
what im wondering is ACIS isnt that supposed to open at approx 4k and 6k rpms?
mine only opens at 4k, what could be the problem stopping it opening at 6k?
any help is much appreciated
3SGE question...
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3SGE question...
by DeviousMR2 » Sun Jan 08, 2006 11:30 am
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by Malcolm » Sun Jan 08, 2006 11:34 am
it can only open once, as there are only one set of butterflies.
I think later ones, or possibly a different Toyota engine altogether had dual ACIS, where it had two steps like you're suggesting.
I think later ones, or possibly a different Toyota engine altogether had dual ACIS, where it had two steps like you're suggesting.
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by EssDub » Sun Jan 08, 2006 2:13 pm
Interesting....mine makes a definite change at both 4kand 6k... That was afer cleaning the whole thing out... 
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1992 SW20 MR2 GT-S Turbo
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Previous Rides: Mazda 323, Toyota Levin BZ-G, 1992 SW20 MR2, 1994 Gen3 SW20 MR2 T-Bar
1992 SW20 MR2 GT-S Turbo
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Previous Rides: Mazda 323, Toyota Levin BZ-G, 1992 SW20 MR2, 1994 Gen3 SW20 MR2 T-Bar
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by Boosted_162 » Sun Jan 08, 2006 2:33 pm
EssDub wrote:Interesting....mine makes a definite change at both 4kand 6k... That was afer cleaning the whole thing out...
Just a thought, could you be noticing the butterflies closing? So open at 4k and close at 6k? Cos over those revs you wont be making much power.
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by CozmoNz » Sun Jan 08, 2006 2:36 pm
dont they run a diferent system again
TVIS = Dual Runners, Same length and volume, secondary opens @ x rpm
Single ACIS = Dual runners, Different lengths and volume, Long runner used until @ rpm, then short opens (effectivly using both)
Dual ACIS = Tri runners, Diff lengths and volumes, longest used, then mid then high end, dependant on rpm.
Resoniator Intake = (isnt this what they have?) just a set of butterflys to a container on top of the manifold?....
*shurg* i might be completely wrong as usual, but yaknow... Cynos have "ACIS" printed on them, and have dual runners (different lengths), and what ive seen of those 3sge's they arnt the same system
TVIS = Dual Runners, Same length and volume, secondary opens @ x rpm
Single ACIS = Dual runners, Different lengths and volume, Long runner used until @ rpm, then short opens (effectivly using both)
Dual ACIS = Tri runners, Diff lengths and volumes, longest used, then mid then high end, dependant on rpm.
Resoniator Intake = (isnt this what they have?) just a set of butterflys to a container on top of the manifold?....
*shurg* i might be completely wrong as usual, but yaknow... Cynos have "ACIS" printed on them, and have dual runners (different lengths), and what ive seen of those 3sge's they arnt the same system
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by AJz » Sun Jan 08, 2006 6:32 pm
yea they are diff.
ACIS in celicas and mr2's, (on the earlier gen1 mr2s and gen2 mr2s) is nothing like TVIS.
looksee here http://homepages.ihug.co.nz/~dnstamp/galleries/ACIS/
its another chamber halfway through the intake manifold with 4 butterflies, this is vacuum controlled only. effective making the intake manifold bigger when you mash your foot. I have found a very very tiny noticable change in pitch but nothing like TVIS. you have to listen very hard.
i do know the cynos ones ur talking about and they are completely different.
ACIS in celicas and mr2's, (on the earlier gen1 mr2s and gen2 mr2s) is nothing like TVIS.
looksee here http://homepages.ihug.co.nz/~dnstamp/galleries/ACIS/
its another chamber halfway through the intake manifold with 4 butterflies, this is vacuum controlled only. effective making the intake manifold bigger when you mash your foot. I have found a very very tiny noticable change in pitch but nothing like TVIS. you have to listen very hard.
i do know the cynos ones ur talking about and they are completely different.
I had vtax 
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by Malcolm » Sun Jan 08, 2006 8:23 pm
the single ACIS system on gen 2 3sge's just opens a second plenum to change the helmholtz tuning of the intake at higher revs (or something).
the single ACIS system on 5e-fhe's has a set of long runners and a set of short runners, and appears to switch between them.
I have no idea about the dual ACIS, but I've heard it has two plenums or something
the single ACIS system on 5e-fhe's has a set of long runners and a set of short runners, and appears to switch between them.
I have no idea about the dual ACIS, but I've heard it has two plenums or something
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