What are the main differences you notice? It really doesn't go into detail about the benefits. Do you unplug the valve on the firewall? Also, you hook the boost gauge up to the bpv hose? I thought this was a no-no on T7.
You CANNOT have a BlowOffValve on T-7 because T-7 "reads and needs" all the air that passes through the motor. If some of the leftover air goes out a BOV for the "PSSHT" noise T-7 will miss this. It's called "metered air". If there is too little "metered air", T-7 will freak out, and give you a CHECK ENGINE LIGHT.
boost gauge on bpv line +solenoid, and i could watch the hesitation in letting boost out when letting off the gas, as well as the late response to getting on it.
The issue with T-7 and tapping the line to the BPV itself is that it will not read properly. There is a system that controls what the BPV sees, and you want to tap into the system that controls the BPV.
Thats what you would normally worry about, but that system is the solenoid your bypassing. Regardless, the system is a noise reducer to make the car more "civil" anyway so you can t off the bov line regardless anyway, you may just get weird delays/responses like I did.
Bypass the solenoid and you get a line straight off the manifold to both the gauge and valve so both react to real manifold pressure
i'm sure it holds boost the same its just a much shorter route when your running the direct line vs. having it flow through the vac valve. i get what your saying
Yeah, i'm not retarded that much, so not sure what happened, but as soon as I put things back, the light went out . IDid exactly what the directions said... I'll screww with it later, but the Viggen isn't out of hybernation yet, so no worries.
I did the mod over a year ago...no problems at all. Can't say I notice a difference but I take NickT's word for it. It must do good things. Cleans up the look of the engine bay with fewer hoses to replace as well.
I did this a few days ago and it defiantly feels more responsive getting on the gas/boost.
Paul,
1. Remove vac line from TB to Solenoid.
2. Remove vac line from Manifold to Solenoid.
3. Cap vac line connection on TB.
4. Move vac line from Bypass Valve to Manifold. (tap this line for boost gauge if u have 1)
5. Keep elec. plugged in on solenoid.
I have tried this it does feel more responsive, but I notice that there is a third line on the Solenoid that runs downward along the firewall, what about that line?
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