Vortech issue
- Thread starter SVTCruz
- Start date
You say BOV (Blow Off Valve) but I assume you mean BYPASS VALVE (recirculation valve). If it is a normal Vortech setup with a draw-through MAF you should never run a blow off valve.
A single standard Bosch valve is perfect for 10 lbs of boost. Thats not your problem.
If it really is a MAF turbulence problem (have youy datalogged the MAF?), it's either the layout of the tubing causing the bypass to blow turbulence on the MAF, air blowing across the air filter causing turbulence on the MAF, or the general layout of the piping causing turbulence as the air moves through the MAF.
The bypass valve should be recurculating air at almost all part throttle conditions, not just at closed throttle. If you are at half throttle and you have vacuum in the manifold then the bypass valve should be open. How are the vacuum hoses to the bypass valves routed? Do they go straight to a vacuum port on the manifold?
EDIT: When you said "intercooled" I assumed you meant with Vortech's air-water intercooler. If you have an air-to-air intercooler then you almost always have turbulence problems unless you get a very specific MAF and route ALL of the tubing and bypass/blow off locations in very specific locations. You CAN NOT just use any-old MAF and locate the MAF and bypass wherever it looks good to you, or you WILL have turbulence problems.
A single standard Bosch valve is perfect for 10 lbs of boost. Thats not your problem.
If it really is a MAF turbulence problem (have youy datalogged the MAF?), it's either the layout of the tubing causing the bypass to blow turbulence on the MAF, air blowing across the air filter causing turbulence on the MAF, or the general layout of the piping causing turbulence as the air moves through the MAF.
The bypass valve should be recurculating air at almost all part throttle conditions, not just at closed throttle. If you are at half throttle and you have vacuum in the manifold then the bypass valve should be open. How are the vacuum hoses to the bypass valves routed? Do they go straight to a vacuum port on the manifold?
EDIT: When you said "intercooled" I assumed you meant with Vortech's air-water intercooler. If you have an air-to-air intercooler then you almost always have turbulence problems unless you get a very specific MAF and route ALL of the tubing and bypass/blow off locations in very specific locations. You CAN NOT just use any-old MAF and locate the MAF and bypass wherever it looks good to you, or you WILL have turbulence problems.
Yes you are correct it is a Bosch by pass valve. I have an air to air intercooler. I have the air filter in the fender followed by the SCT MAF, intake tube, Vortech V2, intercooler then into the throttle. The vacuum line was just split using a T. How do I find out where everything should be placed?
thanks
thanks
Its more difficult to run a draw-through MAF without surging with the very long path required for the air to travel from the MAf until it actually reaches the engine. That is why most air-air intercooler setups use a blow through maf. (Blow though MAFs have their own set of special problems that have to be carefully adressed.)
So assuming for the moment you are not ready to redo the whole system and tune and start over with a new blow-thru MAF, them best you can do is experiment and optimize the setup you have.
Where does the bypass valve attach on the pressure side? before or after the intercooler? Usually between the SC and the intercooler works best.
Where does the bypassed air re-enter the inlet pipe? Sometimes you need to buy/fabricate/modify the supercharger inlet so the bypass air blows directly into the impeller blades and has no chance to backwash towards the MAF.
So assuming for the moment you are not ready to redo the whole system and tune and start over with a new blow-thru MAF, them best you can do is experiment and optimize the setup you have.
Where does the bypass valve attach on the pressure side? before or after the intercooler? Usually between the SC and the intercooler works best.
Where does the bypassed air re-enter the inlet pipe? Sometimes you need to buy/fabricate/modify the supercharger inlet so the bypass air blows directly into the impeller blades and has no chance to backwash towards the MAF.
The Mach is tricky for the inlet pipe because the radiator is so close. Vortech makes an inlet like the one I described for the Fox mustang, but not for the mach. Your best bet is to get a power pipe, because it is metal and you can weld to it, and then have someone weld ikn a fitting as close to the rubber elbow as possible (at the supercharger end of the pipe). Have the fitting welded in at an angle, aiming the bypass air towards the supercharger and away from the maf.
I think you can move the bypass fitting at the other end of the system easier, and will probably do more to solve the problem anyway. Try moving the bypass so the air starts to recirculate right adter it exits the supercharger, before it goes though the intercooler.
