Re: Tune a stock zo6
Unless people have had their stock Corvette tuned they really are missing what the real results are.
Just as example by tuning total stock Corvette.
GM goes by a 80% design rule so tune is adjusted to 80% of the ability of the engine design. That alone leaves performance output limited.
PCM can pull as much as 15 degrees of timing, even if it is false knock
Same as to misfires, lots of timing lost even with false misfire
WOT timing can be as low as only 12 degrees and get trapped into thinking fuel is not best and force into using the low octane timing table
Fuel injector size is a bit small and tuned more to be lean, worse with Ethanol in gas today
Torque management kills off launch to mid engine loads and more during shifts and then engine has to recover from it.
Radiator fans are set to only work from 0 to 35 MPH and not even come on till over 210 water degrees.
To over protect the CATs since GM by law has to warranty them for 8 years or 100,000 miles floods exhaust with fuel to cool CATs down costing wrong AFR at WOT
1 to 4th gear (CAGS) can be turned off, rev limiter can be raised a bit, can adjust for different tire/wheel sizes
C5s were not designed for Ethanol in gas, the PCM can measure for its percentage to gas and tune can make up for that.
Simple change of type of aircleaner and if CAI is installed a tune can better calibration, same for simple change of coolant thermostat opening point.
Plus more but in the least a good tune for a C5 is about 40 plus HP (depending on where in elevation car lives), much better torque low to mid range, less apt to trigger on false knock or misfires and prevent abuse mode kicking in
It is funny people think spending $300-500 for a aircleaner or underdrive pulley makes performance gains but a good tune will not.
Or they spend $1600-2000 for headers for stock engine which require a tune and then claim the gains are from headers when it was the tune that was the true gains
C6 LS3, LS7s gain a good 50 plus HP and LS9 60 plus just from a good custom tune.
Problem is with cheap $500 tuning tools most car owners or some wrencher proclaims they are professional tuners with no experience and Corvette owners suffer from real crappy tuning methods so use a tuner who's main business is tuning and has been doing it for many years on many, many cars.
Difference I know first hand is bad tuner blew my LS6 up, and a good tuner saved me from losing a 2nd engine.
Mike M - 2001 / 2008 Z06s