Originally Posted by SRT6_Roadster
The ASP Pulley is the same size as the RENNtech pulley but minus 2 pulley's in the kit.
They both use the stock belt so ASP must provide a smaller water pump pulley and thus they both will increase boost (SC RPM) at the same engine RPM's.
Originally Posted by SRT6_Roadster
I believe that if the individual only received a 20 rwhp increase there is either an issue with his ECU programming or with his IC pump.
If you compared the HP generated by the RENNtech Pulleys & the ASP Pulleys the difference would be within the margin of error on the dyno.
Hence the first question of this post.
After researching and calling, I believe that Powerchip and InMotion are the two best ECU upgrade options with the ASP Pulley. They both compensate for the increased boost. Although others may be just as good or better, they might not be around in years to come should I require a re-flash.
This prices the ASP Pulley/ECU upgrade at $1,300.
After reading the replies on this post, there really is no true way to baseline or compare ASP, Renntech and EVO. Some say dyno, some say 1/4 ET. I guess how you would measure and compare depends on if you looking for HP gains or shaving your ET.
I'm just looking for increased (noticeable) street performance at the best price I can get. I don't think I could ever tell the difference, if there is any, between the three pulley options. I don't go to the track but would like to know the HP increase over stock for my own curiosity.
I figure the money saved will pay for a SL55 Y-pipe and boost gauge, a new in-dash stereo/DVD player with built in Bluetooth (JVC KD-AVX33), front and rear cameras and molded CF center consoles (maybe medium burlwood). = About $2K
I guess it comes down to simple economics.