Okay so obviously search doesn't turn much up. What I'm more so looking for is anyone that has a bit more experience to the way the MAP sensor reacts to modifying it's signal.

In lieu of people going "huh" I'll give piggyback 101 starting with...

On the lowest level , being a simple MAP Clamp, I could see this providing a modest bump in timing. It's my understanding these cars run pretty rich on stock ECU tuning. Being a superchargers Manifold pressure should be pretty liner it makes a clamp all the more realistic. Since this is not a Turbo'ed application nor does our S/C run any type of bypass. again, just more the reason it should work nice. So in Theory lets say the stock S/C combo makes 14psi manifold pressure. The MAP sensor takes this and tells the ECU 14PSI. The ECU tosses the 14PSI into the timing table, Manifold Pressure being the key ingredient to timing, the ECU spits out ohh lets say 18 degrees timing advance. Well now we adjust the Clamp. for simplicity sake lets assume the stock boost of 14psi puts out say 2.5 volts from the MAP sensor. So we now clamp that Voltage with the MAP clamp to 2.4 volts which equals lets just say 13psi Manifold Pressure. ECU now sees only 13PSI although the S/C is actually putting out 14psi. Result is the ECU is now going to operate on a lower row of cells in both it's timing and Fuel trim maps. lower cells in the fuel trim map are going to lean the car out (simple understanding, less boost =less fuel). Again this should be fine to an extent based on the fact the car runs rich. Now the timing table on the other hand, the lower cells will result in a small bump in timing (again simple understanding, less boost, less cylinder pressure, more timing). So now we have effectively leaned the car out and provided more timing. both able to produce more power.

All this dependent on the MAP sensors ability to be fudged a little. I'm going to assume it CAN be done. One of the "Big Dogs" here on the forums has already admitted to using a "piggy back" to control his fuel but due to the hush hush mentality on this forum I haven't come across which piggy back exactly was used.


From a non mail order tune aspect this basically has the ability to offer mail order results for under 100$ on non upgraded pulley cars. Obviously adding a pulley which by nature is going to lean the car out (how much seams to be an ongoing debate) will bring in diminishing returns on a clamp. As far as a Mail Order tuned car goes, this provides the option to do some light "touch-up" work to your car's already tuned ECU. Also adds the potential to wick it up for race gas track visits.



Next in line would be stepping up to a Air Fuel Controller. SAFC-II/SAFC-Neo/Dtec. Basically upgrading from a liner clamp (map clamp) to a non liner/per RPM clamp. But I'm Hungry and it's lunch time. I'll dive in more when I get back. Again hopefully one of the people that has spent some time messing with the MAP sensor on this engine can chime in.