Is there a performance/ reliability advantage using a Turbo intake manifold?
- Thread starter nissota
- Start date
NA manifold uses ACIS thats a power adding system but it dont give u a whole lot, maybe 5-8 hp? The turbo manifold does not use this system. Look up ACIS for more info, its very complicated and not woth the little extra power but cool at the same time. Its a power adder similar to Vtec but it uses different means to add power
Yes, ACIS is more like a secondary intake runner length and doesn't add any top end power, but increases runner length for more low end torque on the GE. The only way to control the ACIS system is with a factory GE TCCS.
If you are using GE electronics, stick with the GE manifold, it may help spool up, If you are on GTE electronics, stick with a GTE mani or look up Ron Ramirez or Sethron for a custom front facing design.
If you are using GE electronics, stick with the GE manifold, it may help spool up, If you are on GTE electronics, stick with a GTE mani or look up Ron Ramirez or Sethron for a custom front facing design.
Keeping it open at all times gains nothing. The purpose of the valve is to close below a certain RPM and boost low end torque by simulating a ram air resonance effect. By holding the valve open, all you are doing is increasing the plenum volume, which leads to a throttle snap choke. You'd be better off with a turbo mani... or leave the ge ecu in place to control the valve.'
I suppose keeping it open would work as a "last" resort, but turbo intakes are dirt cheap.
I suppose keeping it open would work as a "last" resort, but turbo intakes are dirt cheap.
Just use the turbo manifold. It's a good unit, and lot less complicated than the N/A one. Most FF proponents really are just after the looks, and try to sugar coat it why they want one, but the stock manifold is the least of your worries on these cars.
Don't waste your money buying a turbo manifold. I turbocharged my na and used the na manifold. No problems of any kind. I just locked my acis into the open position and have no problem with throttle snap, bogging, or anything else.
to keep the valve open is easy.... Just disconnect the single vaccum hose going to the thing... then its stuck open, you'll notice that there is almost no low end and you'll see the same gains at high rpm.+
chris89 said:
My manifold has the valve in the normally closed position without any vacuum.
If I connect vacuum hose to the diaphram actuator then the throttle plate will open.
When the engine is under boost (no vacuum to the diaphram) it will then close.
I modified my manifold as Tubbie recommended .
I removed the diaphram actuator and locked the throttle valve in the open position.
IHI-RHC7 said:
Actually the ACIS system is purely mechanical. The ECU has nothing to do with it, however I doubt the calculations for the ACIS design work for the turbo.
Shawndude said:
30-40hp gain, better throttle response, less stuff to remove to do maintainance & better intercoolers with shorter I/C lines are only for looks? :icon_conf
30-40hp gain on what though? If you're trying to shove 30psi with a monster turbo through the stock manifold then yeah you'll definitely see improvement with a FFM. It just depends on what your bottleneck is.
Bishop92t said:
yes, i believe it was dr. jonez who came to the conclusion that the ACIS would not function properly under positive pressure, or am i remembering something wrong? i'll dig around a bit.
-shaeff
Bishop92t said:
The vast majority that run FFI's are running high psi too, that's why the eyecandy statement is somewhat bunk.
nissota said:
the non turbo intake manifold is different than the turbo with the acis.... I thought the turbo manifold doesn't have the acis at all. not 100% though, i have an extra turbo manifold i should take a look at. I had an idea for the na or turbo, is to Make secondary intake runners that activate at the same time as the normal acis would but instead of 1 valve make 6 extra runners that open around 4k i believe, for better low and top end.