Delete vacuum sensor?

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 17:50:08 GMT

Yeah thought as much,

Yeah if I ever can make a spacer I would give it ago but I guess I'll just leave this one
I to font understand how it could increase power that much for just 3cm of extra runner length you would have to sacrifice torque/power elsewhere I would think.

Thanks anyways targa

Re:Delete vacuum sensor? (Reddtarga)

Fri, 04 Jan 2013 17:45:15 GMT

A bad idea to totally disengage the ACIS (valves open) 'cos you would loose all your bottom end torque.

Before I fixed my ACIS the valves were stuck in the closed position so while my car was fine at lower revs, I was loosing a lot of power at high revs.
Toyota designed it to work the way it does for a very good reason.

As for the riser/spacers, I have no idea of their value.
I have read several posts on various forums about them, but have never found anything conclusive.

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 17:32:54 GMT

Yeah fair point
If I had the equipment I would be prepared to give it ago and compare results
My partners uncle owns GeForce at Gateshead so using a dyno isn't a problem

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 17:31:41 GMT

Yeah that would be true it would be worth testing tho just to actually see what would happen. On both the 2 and 3

Anyone here played with keeping the Acis engaged from idle? If so decent gains? Or would it not be worth messing with it I have 2 Acis assembly's
Worth doing red targa or not ?

Re:Delete vacuum sensor? (Reddtarga)

Fri, 04 Jan 2013 17:29:16 GMT

Gatesys SW20

Ahh I see
So wouldn't there be some trick to keeping the valves opened from idle all the way to 7200? Or is that a silly question

So the spacer wouldn't work at all on a gen 2 right

1. Yes.

2. IMO would probably do SFA (and on a gen3 as well).

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 17:18:34 GMT

Ahh I see
So wouldn't there be some trick to keeping the valves opened from idle all the way to 7200? Or is that a silly question

So the spacer wouldn't work at all on a gen 2 right

Re:Delete vacuum sensor? (Reddtarga)

Fri, 04 Jan 2013 17:15:36 GMT

BTW I should have mentioned that when the motor is stopped the ACIS valves are open, but when the motor starts they close.

Re:Delete vacuum sensor? (Reddtarga)

Fri, 04 Jan 2013 17:05:09 GMT

No, I think you've got it back to front.
I think ACIS works as described below, but anyone can feel free to correct me.

With the gen2 3sge with the motor running, below 5000 rpm the ACIS valves are closed, making the intake runners operate at full length (from the valves out to the throttle body - long runner - max torque).
A bit above 5k rpm the ECU starts to open the valves, effectively making the runners operate at half length (the lower half) for max power at high revs. Something called Helmholtz effect and I can assure you that ACIS definitely works.

Shortly after I bought my car I discovered that the ACIS valves were seized up. Water had got past the metal gasket into the middle hollow inside the casting and badly rusting the shaft. (keep this in mind if washing down the motor after degreasing)
It was impossible to free it up and I had to replace the whole ACIS assembly. After that it sure made a hell of a difference at high revs, and I could really feel the rush just over 5k.

To test that the shaft is free you need to carefully reach under the operating lever and check that it moves freely, but the service manual gives a full procedure for testing ACIS operation.

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 16:17:26 GMT

Having a second look it looks practically the same I don't see why it wouldn't work on a gen 2 besides when the butterfly's of of the Acis close air would still be able to go up towards the butterfly's further
Other then that looks very similar in design besides where the spacer goes on a gen 3 after the butterfly's the spacer would have to go before the butterfly's

In saying this the butterfly's close at 4200rpm right? Not open?

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 15:55:29 GMT

Yeah just saw that actually on my manifold,
How silly of me

Damn those 3rd gens :p

But here is the link could be fake could not be
But does make you think.

Also ace how does the Acis work on a gen 2 what does it actually achieve?

http://www.toymods.org.au...gen-3-only-2-mods.html

Re:Delete vacuum sensor? (just_ace)

Fri, 04 Jan 2013 15:49:09 GMT

got a link to those setups? did they have a dyno reading prior to mods. and is it only the intake mods? seems optomistic to get 180hp atw when that is what their quoted power output was at the engine from the factory.

i can't see how a simple spacing of the manifold/lengthen of the runners and a slightly larger TB can make up for all drivetrain losses.

also as i under stand it the ACIS is fitted differently to the gen3 than the gen2.

where the acis is connected to the gen2, fitting a spacer between the acis and the manifold on a gen2 can't achieve anything. it won't lengthen the inlet manifolds over all, only when the acis opens up the air will have slightly more distance to travel when crossing over from each runner?

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 12:06:03 GMT

Yeah, that's my plan to
Ill have it dynod before and after and update you guys it's popular with the supra guys so why not with us few jap guys have done it and from a stock gen 3 have gotten 132rwkw with that and a beams tb?

Thanks again ace

Re:Delete vacuum sensor? (just_ace)

Fri, 04 Jan 2013 11:59:48 GMT

Gatesys SW20

Bit if an update thanks to
just ace
My car Is back and running :) thank you so much for that fuel rail.
In the process of having a spacer for the Acis system made up by a machine shop
30mm from other should be good for 25bhp of torque.

no prob.

interesting, you mean 25ftlb of torque? be good if you could get back to back dyno readings to see how much real world difference it makes at the treads.

Re:Delete vacuum sensor? (Gatesys SW20)

Fri, 04 Jan 2013 11:20:16 GMT

Bit if an update thanks to
just ace
My car Is back and running :) thank you so much for that fuel rail.

Not sure what ill do with mine either plug the hole and send the jap rail back to ace or leave it as a spare

Got the genuine o rings from toyota bought the last 8 they had on the shelf for spares :p

And installed a fire exstinguisher behind the passenger seat mounting it off an existing hole.

In the process of having a spacer for the Acis system made up by a machine shop
30mm from other should be good for 25bhp of torque.

Re:Delete vacuum sensor? (just_ace)

Mon, 24 Dec 2012 19:25:19 GMT

is the difference of wether you have a CSI on a gen2 due to it being rev1/2 or ADM/jdm? or both?

pretty sure my inlaws rev2 jdm didn't have CSI, but my ADM rev1 did.

TBH my prefered solution to your problem would be to port your original manifold and put it back on.