[oldman]

So basically the PD has unusable torque because it can't be used. Of course it goes without saying if you don't floor it, you won't blow the tires away, but then again you are not using the 600 ft -lbs hence the word "unusable". Not once did I ever say or infer that the PD can't be driven. To be clear the PD can't put WOT down in the first two gears with any normal street tire.

Originally Posted by ShizzySupra

If you have crappy tires and make power you are going to spin in lower gears PERIOD.

If you define "crappy tire" as anything less than 00 drag radials and a prep track. That is a 100% accurate statement.


On summer street tires a centri can supply all the power that is ever going to hit the ground, at any normal streetable speed PERIOD. Anything outside of WOT in 1st gear say at 5 MPH, and during each shift the centri is complete and totally in the boost / power range. I can no longer use no lift shift as the car would be upside down, in any streetable shift range. Please we are talking hicomp direct injection V8, here, there is NO lag with either setup, the PD's "advantage" can't be used with street tires.

The only thing that would seem to be true is that on a dragstrip with slicks / 00 drag radials, sans converter the PD does have an advantage. Only in this fully qualified statement is where all 600 ft -lbs can hit the strip. That as not me or most members here, so I'll defer to the guys that are doing it. At this range it is cubic money anyway and the centri guy is just going for converter and / or gears and the cycle never ends.

Originally Posted by bpang1234

I have a custom tune on mine and my tuner focused most of his time on part-throttle. It feels SO MUCH better than the OTS map that came with it. I still prefer it to the Whipple/Maggie mostly because it helps me apply power when exiting corners onto straightaways which is the one thing that I am least confident about having driven AWD cars for 15 years before this thing.

Now to applying the power to the ground turn exit, you must be a better driver than me or any 1LE at my local autoX cause none of us can use more that the stock torque / HP on turn exit. Please I know at least someone is going to post how they drift on the street with no traction control.

The car has great traction control and it tends to straighten the car when applying power on the street, but to say that a PD can supply some sort of corner or turn exit either on the autoX with no traction control or on the street (with traction control) has no reality on the street or autoX.

If you are talking road race, then I'll defer to you, as my local road race is only slightly better than the local autoX. At least it has hills..... So a fully qualified statement would be " a properly tuned PD on a road race with a good driver with proper tires and suspension will feel and probably have some advantage on turn exit. " Probably so, not in my realm of experience.


So nutshell, outside of some very specific setups, I don't see any reason to go from centri to PD. Of course if you are on the fence like I was, ADM's LT4 conversion is at a great price / performance point. Add in the LT1 has more CR a larger cam and hence responds better that even the OEM LT4. I would have gone this route because I do like the more linear feel of a flat torque curve and instant (1/4 to 1/2 second) better response of a PD. If you are doing this for drag racing, dunno lots of guys here have PD, turbo, centri and / or N2O, I think it is a cubic money issue at some point vs which is a better setup.