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I more than redlined my 97 vmax for a second or 2, then afterwards the engine had a different tone and my top speed went from 140mph to about 105mph with noticible power loss, probably 20% power loss. compression test showed 150, 135, 110, 100, what do u think is wrong
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drive to you closest auto parts store, and have them scan the engine codes, it might be something might have not got plugged back in during the motor swap ?
Not driving a corvette? Just kidding. More details are important. How slow is your acceleration? Is it 0-60 in 8 seconds, or 20 seconds? What is redline on your car? If redline is 5K then 4000 is a good responsible shift point. If redline is 8K then shifting at 4000 is probably robbing your engine of it's torque and horsepower band. I believe the GTS model has an 8K RPM redline, the GT may be lower, but in that case, shifting at 4K is too soon for strong acceleration. Your Tachometer should have redline clearly marked. For responsible use, stay below that, maybe 10-20%. For economy stay further still, but for power you need to let the engine use it's RPMS, especially smaller and fewer cylinder engines usually don't make their power until they are half way through the RPM range and above.
Maybe you hold check the coolant level. If there isn't enough coolant in the system the first thing that stops working is the heater.
If it is lie than you need to figure out where it is leaking.
What engine do you have?
check battery is charged if it is check hidden fuses, i had the same problem with the thunderace, i thought it was the battery but it was a hidden fuse
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