bluefoxicy
Wrench Pro
- Points
- 51
- Car
- 1995 Cavalier
I've never done an ECU remap and don't know much about the basics. There's not going to be a power x economy slider in there or anything nice, so I'll need some low level understanding of engine dynamics to do anything I guess (unless I want to blow up the car).
Mostly what I want is to get a 2000-ish (2001-2005) VW Jetta TDI and an OBD2 or VAG computer, and make the Jetta output say 200ftlb@1500RPM, continuing to stay above 80% of that to about 4250RPM.
My assumption is that the VW redlines at 4500, and a Cobalt redlines at 6500; thus, adjusting the gearing, 1500RPM diesel would be equivalent to 2166RPM on the Cobalt, and 4250 about 6138. I'd want the Cobalt to peak at about 2000 and still deliver decent power to about 6000, though the non-SS model peaks at 4500 and delivers decent power to about 6250.
The other question of course is where does the VW idle, and where do I hold 80mph at in 5th gear? Also if the car's aware of what gear it's in (in the stick shift), can I adjust the fuel map based on individual gears? Personally, I would find it useful to tune a car to deliver more fuel and push more power in lower gear; but back off into an economy mode in fifth gear, only pushing more power above a higher threshold, or (if possible) when the throttle is thrown down hard.
Of course the turbocharger complicates this, because more fuel creates more gas (if it burns, of course; flooding the engine won't help) and drives it harder.
At any rate I can't just go mixing settings up willy nilly and hope I get some power output.
Mostly what I want is to get a 2000-ish (2001-2005) VW Jetta TDI and an OBD2 or VAG computer, and make the Jetta output say 200ftlb@1500RPM, continuing to stay above 80% of that to about 4250RPM.
My assumption is that the VW redlines at 4500, and a Cobalt redlines at 6500; thus, adjusting the gearing, 1500RPM diesel would be equivalent to 2166RPM on the Cobalt, and 4250 about 6138. I'd want the Cobalt to peak at about 2000 and still deliver decent power to about 6000, though the non-SS model peaks at 4500 and delivers decent power to about 6250.
The other question of course is where does the VW idle, and where do I hold 80mph at in 5th gear? Also if the car's aware of what gear it's in (in the stick shift), can I adjust the fuel map based on individual gears? Personally, I would find it useful to tune a car to deliver more fuel and push more power in lower gear; but back off into an economy mode in fifth gear, only pushing more power above a higher threshold, or (if possible) when the throttle is thrown down hard.
Of course the turbocharger complicates this, because more fuel creates more gas (if it burns, of course; flooding the engine won't help) and drives it harder.
At any rate I can't just go mixing settings up willy nilly and hope I get some power output.