PPC Tuners are ready for HHR!
ecoboost can provide a definitive answer, but I would imagine most of the tune work has been done on the engine, not the auto trans data... it's up to the driver to keep the engine spinning at the right RPM range for optimal performance (hence my comment in another thread as to why anyone would EVER buy a turbo motor with an auto trans and expect "high performance"... the auto just doesn't allow sufficient driver control of engine and turbo speed).
not real sure what your saying here. the graphs on his site say auto trans. there's no comparison between auto and 5spd stock to stock. the 5spd i drove would go right to 15-17lbs in any gear when put to the floor. the auto was real dissapointing to me with the way gm has it tuned. i'm real interested in knowing what 20-25lbs of boost would do for the 5spd wagon. i'm looking forward to ordering one up soon.
not real sure what your saying here. the graphs on his site say auto trans. there's no comparison between auto and 5spd stock to stock. the 5spd i drove would go right to 15-17lbs in any gear when put to the floor. the auto was real dissapointing to me with the way gm has it tuned. i'm real interested in knowing what 20-25lbs of boost would do for the 5spd wagon. i'm looking forward to ordering one up soon.
ECM's generally have "maps" for engine performance characteristics, and "maps" for transmission behavior. In a manual transmission, most of the transmission "maps" go away. I would expect that, given the general flimsiness of the auto trans the HHR SS comes with, Hahn and PPC haven't spent much time tweaking transmission behavior (shift points, pump pressure, etc.), and instead have spent their R&D effort working on engine characteristics.
And re stick and auto, as I've said in a few other threads, a turbo vehicle with an auto transmission is a VERY poor performance combination. The whole value of a turbo is to keep it spooling at optimum... you simply cannot do this with an auto transmission where you have no real control over shift RPM and over the "between" shift engine RPM (with an auto, the engine RPM falls between shifts... as it's designed to, and so the turbo spins down, hampering the engine's ability to make power as it goes into the next gear. With a stick, the driver simply needs to blip the throttle between shifts to keep the turbo spinning optimally.
It just depends on what you want out of it. I am more than pleased with my Auto SS. It has all the power I need. I just wanted something that had decent power, handling and good gas mileage. If I had wanted the fastest car around I would have probably opted for the 5 speed.
It just depends on what you want out of it. I am more than pleased with my Auto SS. It has all the power I need. I just wanted something that had decent power, handling and good gas mileage. If I had wanted the fastest car around I would have probably opted for the 5 speed.
).My comments about auto trans turbo cars isn't intended to be a knock against them, but rather a bit of notice to owners that it is not a base platform from wihch you will likely appreciate significant gains by performance mods. Except in the corner case of highly modified track-only drag racing, the auto trans is, by design, a significant comprimise between performance and convenience. By all means, drive it and enjoy it like it is.
The 5 speed is also way faster than stock. The increase in boost from stock 15 psi (6-10 in first) to 24 psi in all gears does just what you would expect. Motor feels and sounds smooth and healthy running at full boost (on 93 octane).


