supercharged 86 gt

Yan88gt · 08-09-2001, 07:19 PM

The problem with speed density is that it cannot see boost so you have to trick it.Here's how you can trick it :

Locate your MAP sensor.
It will have a vac line coming off of it. (it may have a T in it along the way to the intake or VAC tree, this is OK).

You want to install a one-way check valve, which you can buy from any autoparts store. Advance Auto / AutoZone / Napa, usually they have them over the counter on a rack with all kinds of VAC accessories. Try to find one close to the size of your MAP sensor vac lines or you will need to buy adapter.

Now that you have that installed. You will need to T the line between the MAP sensor and your newsly installed check valve (which will only let air OUT of the MAP and not in).

Run a piece of VAC line from this T about 6" or whatever lengh will give you access to hold it above the engine (so you can put your finger on it etc).

Go to a Fish store. Yes a tropical fish / Pet store; buy an aquarium air diverter valve. These are sold in different varieties, but you only need to use one valve (most have 1, 2, or 4 valves per unit). They also make screw in, or turn valve type. I am using a screw in type. You want to install this valve on the end of your "T" line.

Start the car.

And play with the valve so it just leaks a tiny bit. If its too OPEN your car will idle rough, if its too closed your engine will cut out during accellerations. You need to bleed in atmospheric pressure during boost.

Good luck

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08-09-2001, 07:19 PM	#4
Yan88gt Registered Member Join Date: Jun 2001 Location: Quebec canada Posts: 92	The problem with speed density is that it cannot see boost so you have to trick it.Here's how you can trick it : Locate your MAP sensor. It will have a vac line coming off of it. (it may have a T in it along the way to the intake or VAC tree, this is OK). You want to install a one-way check valve, which you can buy from any autoparts store. Advance Auto / AutoZone / Napa, usually they have them over the counter on a rack with all kinds of VAC accessories. Try to find one close to the size of your MAP sensor vac lines or you will need to buy adapter. Now that you have that installed. You will need to T the line between the MAP sensor and your newsly installed check valve (which will only let air OUT of the MAP and not in). Run a piece of VAC line from this T about 6" or whatever lengh will give you access to hold it above the engine (so you can put your finger on it etc). Go to a Fish store. Yes a tropical fish / Pet store; buy an aquarium air diverter valve. These are sold in different varieties, but you only need to use one valve (most have 1, 2, or 4 valves per unit). They also make screw in, or turn valve type. I am using a screw in type. You want to install this valve on the end of your "T" line. Start the car. And play with the valve so it just leaks a tiny bit. If its too OPEN your car will idle rough, if its too closed your engine will cut out during accellerations. You need to bleed in atmospheric pressure during boost. Good luck