Emissions removal clearification. 1990 n/a

For the acv removal all the highlighted systems and lines are to be removed?
Then block off plates installed. and vaccums capped.

Are their any other things to be done. i.e sensor connectors need to be tricked to giving good signals to comp. or adjustment on another system

ACV REMOVAL
1 ACV
2 solenoid valve (6pi)
3 solenoid valve (Switch)
4 solenoid valve (relief)
5 solenoid valve (VDI)
6 air pipe to exhaust
7 air pump
8 VDI actuator
9 appropiate vaccum lines
10 instal block off plate

BAC REMOVAL
1 BAC
2 hose to intake
3 replace coolant hoses
4 install block off plate

cap all vac nipples

AM I FORGETTING ANYTHING????????

 

You realise you'll lose ~30hp when you remove the ACV? This will disable the 6PI and VDI systems.

The BAC valve is not for emissions control, it's for idle control. There's no advantage to removing it.

 

yes i know. i regret doing it now. so i am thinking of reinstalling it or install the electric air pump

 

nz
can use the exhaust pressure to activate both these systems with no damge from heat.

i have headers and presilencer, so ill just drill and tap into the exhaust

 

My RB dual exhaust header has a back-pressure pipe that faces DIRECTLY into the front exhaust port - not just a hole in the side - if u just drill a hole you might not get enough direct pressure. Just thought you might like to know.

Ramses666

 

Back pressure from the exhaust won't help the VDI imho. The airpump does not eat up any hp worth talking about. Absence of the VDI and aux port action effects driveability whereas having the airpump installed does......not.

 

Why wouldn't back pressure from exhaust work the VDI? Could you be more specific?

Ramses666

 

I wouldn't use backpressure for either. There is no way to open each system at the correct time.

 

Keep the solenoids in place, and simply replace the source of air pressure. No difference. The VDI and 6PI don't give a damn where the pressure is coming from once the solenoids click open.

 

my, my, my.

 

I realize I resurrected an old thread, but I think it was a worthwhile contribution.

This is something I've been researching for a while, and I expected somebody to respond with this solution. Strange enough, nobody ever suggests using back pressure on an S5 system. No difference really, if you think about it.

Recently I've been working on a 'pressure reservoir' for my S5, to keep a healthy reserve on tap from m S4 RB pre-silencer (back pressure port). A 1 or 2 liter reservoir could hold enough air at 5psi to last through 10 or more instances of solenoid clickings! But keep in mind that it would be continually topped off by exhaust back pressure through a couple high-quality check valves. Sounds like a bomb waiting to happen, but it might be a better idea.

Anyone know if the S4 system uses a reservoir? Or is it just straight back pressure?

 

just use an electric pump system like the one Kevin landers has on his website. not sure why everyone wants to reinvent the wheel or try melting down their car with hot combustible air in a can to open some simple ports.

 

Because I see, so often, people saying you cannot remove the air pump on an S5 because it actuates the ports. It's always like, "air pump or wire them open". And I have an engineering mind, so why not? It sounds like a challenge!

BTW

Have a link to the Landers site with this electric pump you mention?

 

Just plain 'ole backpressure from the converter thru the split air pipe.