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From a "Chevy High Performance" magazine article that just appeared in my email:
"
The Dyno Doesn’t Lie
The idea was to see what kind of real-world horsepower gains we could generate with only a few simple bolt-ons. Enlisting the help of Mike Taylor and his stock ’99 LS1 SS Camaro, we baselined the SS on the Morgan Motorsports chassis dyno in Reseda, California. Initial numbers revealed an impressive 305 hp and 322 lb-ft of torque. Next we plugged in the Hypertech Power Programmer III (PP3) into the data link connector and waited 10 minutes for the non-reformulated gas (non-RFG) tune to upload into the LS1 computer (see sidebar “Gas Is Gas...Right?”). Back on the dyno, we immediately witnessed the horsepower jump to 312 with the new lb-ft figures reading at 328.
"
So, the hard reality, at least in the case of this particular 99 Camaro that uses an LS1 that is at least very similar to the engines our 03 and 04 SSRs have, was only 7 hp gained and 6 ft lb of torque.
The above aticle was the first one I happened to find that actually TESTED the difference on an independent dyno.
I would have liked to also see the ENTIRE dyno curve, but they didn't show that.
Be wary reading those "up to 20 hp" claims that various manufactuerers of these devices make. Insist on proof before giving them the money.
Jim G
"
The Dyno Doesn’t Lie
The idea was to see what kind of real-world horsepower gains we could generate with only a few simple bolt-ons. Enlisting the help of Mike Taylor and his stock ’99 LS1 SS Camaro, we baselined the SS on the Morgan Motorsports chassis dyno in Reseda, California. Initial numbers revealed an impressive 305 hp and 322 lb-ft of torque. Next we plugged in the Hypertech Power Programmer III (PP3) into the data link connector and waited 10 minutes for the non-reformulated gas (non-RFG) tune to upload into the LS1 computer (see sidebar “Gas Is Gas...Right?”). Back on the dyno, we immediately witnessed the horsepower jump to 312 with the new lb-ft figures reading at 328.
"
So, the hard reality, at least in the case of this particular 99 Camaro that uses an LS1 that is at least very similar to the engines our 03 and 04 SSRs have, was only 7 hp gained and 6 ft lb of torque.
The above aticle was the first one I happened to find that actually TESTED the difference on an independent dyno.
I would have liked to also see the ENTIRE dyno curve, but they didn't show that.
Be wary reading those "up to 20 hp" claims that various manufactuerers of these devices make. Insist on proof before giving them the money.
Jim G