Hi, Guest
Like I said in your other post, the addition of a UDP reduces parasitic drag on the motor. It "frees up" horsepower that was already there to begin with.
The "downside" is that the RPMs at which your accessories begin to operate at optimum levels increase somewhat. For example, my alternator doesn't fully charge below 1200 RPMs or so, but the low voltage light never comes on. I've tested available voltage with a multimeter and with the digital readout (less scientific, I know) on my DC/AC inverter... it never goes below 11.2 volts.
The A/C runs a little less "optimally" at idle than a stock vehicle, but on the highway your performance will / should improve a fair amount over stock. I noticed I could pull up hills with the lockup engaged in 4th where I had to get out of lockup before.
The only other thing that happens (that I've noticed / others have noticed) besides greater steering effort at low speed is that the idle air voltage is a tad low and that throws off the idle a bit. It's not "lumpy" or unstable, it just wavers a bit when the car is cold. It's still more than driveable, however. :)
If you have any other questions, ask away or shoot me a PM if you want. :)
The "downside" is that the RPMs at which your accessories begin to operate at optimum levels increase somewhat. For example, my alternator doesn't fully charge below 1200 RPMs or so, but the low voltage light never comes on. I've tested available voltage with a multimeter and with the digital readout (less scientific, I know) on my DC/AC inverter... it never goes below 11.2 volts.
The A/C runs a little less "optimally" at idle than a stock vehicle, but on the highway your performance will / should improve a fair amount over stock. I noticed I could pull up hills with the lockup engaged in 4th where I had to get out of lockup before.
The only other thing that happens (that I've noticed / others have noticed) besides greater steering effort at low speed is that the idle air voltage is a tad low and that throws off the idle a bit. It's not "lumpy" or unstable, it just wavers a bit when the car is cold. It's still more than driveable, however. :)
If you have any other questions, ask away or shoot me a PM if you want. :)
Daily driver 1: 2007 Jeep Wrangler Unlimited Sport "S"
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned.
Daily driver 2: 2006 Subaru Legacy GT
COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.
33" BFG Mud-Terrain KM2s, lots of Rough Country gear - bumper, 2.5" lift, swaybar disconnects, Superwinch 10,000lb winch, Detroit Locker in rear D44 axle, custom exhaust, K+N filtercharger, Superchips-tuned.
Daily driver 2: 2006 Subaru Legacy GT
COBB Stage 1+ package - AccessPort tuner, COBB intake and airbox. Stage 2 coming shortly - COBB 3" AT stainless DP and race cat, custom 3" Magnaflow-based exhaust and Stage 2 COBB tune.