ACIS manifold video???

spanna21

Fresh Recruit
I am also using the acis manifold but the problem i'm have is that when underboost the pressure shuts it again (there meant to be under vaccumm) to the around my problem i'm using a wastegate actuator instead :) i hope this helps.
 

hardcoreep

Member +
how do you go about setting the changeover point?
You use some sort of rpm trigger. The quick way is to dyno with it on and then off and then see where the power cirves converge and move from there.
 

weeJohn

Lifer
As with the bajan car a huge part of the effort is to have it operate like factory based on throttle/load positions.

Hmmm, does it use a pressure switch from the manifold to activate the actuator then or is it ECU controlled?

I would not be that worried myself about it changing at various points due to engine load as I see my use as a full throttle load when dragging, but on the like of a sprint or racecar I can see the uses for load changeover.
 

ramses974

Member +
i can use the ultimate to do it
but for comodity i have wired it on my Greddy boost gauge .to activate it
 
thanks so much for your input weejohn...GREAT comparison

from looking at hoodey's site/map..it appears it runs either ON or OFF in this application
http://www.bajanchameleon.com/5efhe_actuator.html
it appears you can build a map to suit pressure vs rpm to control how and here u want to short runners to open, but again this is an on/off position

i'd assume a more ""curved/variable"" point map may be beneficial for track/everyday driving
whereas a fixed on/off rpm point map may be ok for drags
to some people setting up a "variable" trigger for pressure vs rpm may not be worth all the effort, where to others it may be very beneficial
i guess each person would have to decide what's best for them

on another point, there does not seem to be any part opening for the butterflies in the short runners---ie 30%, 40%, 75%, etc
i know there have been some discussions where it was mentioned that on a stock 5efhe ecu controlled system, that the ecu may control partial opening of the butterflies based on load/rpm/etc inputs...

is there any concrete evidence of this, as i imagine it may be hard to partially open these items with the way how the vacuum actuator is set up

what i can see fluctuating is the point at where the runners completely open/close based on those inputs into the stock 5efhe ecu/set-up

just more information for discussion
 
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I am also using the acis manifold but the problem i'm have is that when underboost the pressure shuts it again (there meant to be under vaccumm) to the around my problem i'm using a wastegate actuator instead :) i hope this helps.

interesting, information

i dont recall this problem being expereinced by a fellow user----using the same stock 5efhe vacuum actuator on their set up

iirc, dont the butterflies go into an "upright/perpendicular" position when open?? i'd suspect it would be a little hard for boost pressure to close them from that angle

anyone else observed this?
 

hardcoreep

Member +
i know there have been some discussions where it was mentioned that on a stock 5efhe ecu controlled system, that the ecu may control partial opening of the butterflies based on load/rpm/etc inputs...
I'm not aware of the butterflies being open partially. I don't see a mechanism to do so. What I do know from the ECU research is that the computer does not have a singular activation point. It looks at the various other parameters and open/closes them as necessary to eliminate possible flat spots, or maintain a specific programmed power curve between a set rpm range. Below that range closed, above that range open.

However, it might be possible given how the solenoid works and the capabilities of the aftermarket system. The solenoid could be connected and controlled via pressure where the percentage of bleed could be varied. Treating it as an additional injector might also allow a percentage based operation.
 
for those of you running the acis manifold or who have expereince driving in a car with one installed---weejohn, spanna21, etc

do you notice or feel when the short runners are activated at the change over point/rpm??---like a hesitation, jerk, etc
or is it a smooth transition at the change over point/rpm to the short runners??

i'm wondering if it has kind of a mivec, vtec, lift feeling?!?!?
 
It was dropped again and discovered that 3800 rpm was the best changeover point for set up, giving a wider power band and torque increasing quite a bit after 3800 rpm compared to before it. Torque did not increase its max value but the top of the torque curve widened each time.

interesting thing i noticed here weejohn
3800rpm seems to be the point where the acis is activated using the stock 5efhe ecu---subject to parameters i suppose its one of the points
http://www.tercelreference.com/articles/acis_activation_options/acis_activation_options.html

interesting coincidence
 

spanna21

Fresh Recruit
sorry carnt help ya .i'm still havent put my acuator in yet so i dont know, mine is still running with the long runners only :/ ...
 

weeJohn

Lifer
I didnt notice any differnce when the runners changed over Anderson, unfortunately its not like the Vtec in a Honda. I do notice the difference but when I dont change them over, the car labours to the rev limit as if its not getting enough air in.

I had only seen before the 5200rpm changheover point discussed, thats a good read on the Tercel site. The EMU mapped changeover is the proper way to do it, no doubt.
 

ramses974

Member +
for those of you running the acis manifold or who have expereince driving in a car with one installed---weejohn, spanna21, etc

do you notice or feel when the short runners are activated at the change over point/rpm??---like a hesitation, jerk, etc
or is it a smooth transition at the change over point/rpm to the short runners??


i'm wondering if it has kind of a mivec, vtec, lift feeling?!?!?
i did not feeling something..it is smooth on 4e with tdO4...i feel it only on my blitz graph...
that is why i am thinking shortened the runner with 4Efte manifold to verify if it will be more
 

weeJohn

Lifer
At long last I was able to get a print out from the dyno runs. I was only able to get 2 graphs on the 1 page so I took the 3800 rpm changeover point and the 4500 changeover point to show the difference. I originally had the runners set to change at 5200 rpm and there was a considerable improvement in the curve changing that to 4500, so the total difference to 3800 is quite a lot. The solid lines are the 3800 run and the dotted 4500, hope you can see them ok.

ACISchangeoverdynograph.jpg


These runs were done back to back, 2 minutes apart, the only changes made were the changeover point.

Total torque only improved buy 1 ft/lbs and total power by about 0.3 bhp, but its the earlier point the torque was reached is the point here. My turbo is on its way out and thats why torque drops off so much towards the limiter.
 
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billybob

Untrusted Seller
looks well john good bit of differance in the change over so the acuis do work good,,,ive 5 more out in the shed lol

nice power from a tdo4
 
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