My father and I are trying to get his 88 coupe into the 12's without any
major engine work. We have improved everything else on the car. Only
thing we've changed on the engine is a 65mm T.B..
Last year at the dragstrip his best time was 13.26 @ 103.4 mph w/ a
1.92 60'. This spring we put 4.10 gears in it ,from 3.55's. We were at
the dragstrip for the first time this year with the new gears. Our
results were good, but not expected. His 60' dropped to 1.83's - 1.85's
(that's great), but we are now going through the traps at 5800 rpm,
instead of 4700 rpm. Too much for the stock cam. quater mile times have
slowed to 13.34's - 13.4's @101.5 mph.
I'm looking for facts not guess's. I've heard that advancing the cam
improves low rpm torque and retarding it raises the rpm band. My
question is, is this true? I see a lot of seat of the pants answers on
different places, but that doesn't mean much.
I can give a list of modifications to the car, if it would help. There
are so many I hate to try to list them all. These times are all with
the car fully intact,not gutted.
Thanks in advance to any helpful
replies.
major engine work. We have improved everything else on the car. Only
thing we've changed on the engine is a 65mm T.B..
Last year at the dragstrip his best time was 13.26 @ 103.4 mph w/ a
1.92 60'. This spring we put 4.10 gears in it ,from 3.55's. We were at
the dragstrip for the first time this year with the new gears. Our
results were good, but not expected. His 60' dropped to 1.83's - 1.85's
(that's great), but we are now going through the traps at 5800 rpm,
instead of 4700 rpm. Too much for the stock cam. quater mile times have
slowed to 13.34's - 13.4's @101.5 mph.
I'm looking for facts not guess's. I've heard that advancing the cam
improves low rpm torque and retarding it raises the rpm band. My
question is, is this true? I see a lot of seat of the pants answers on
different places, but that doesn't mean much.
I can give a list of modifications to the car, if it would help. There
are so many I hate to try to list them all. These times are all with
the car fully intact,not gutted.
Thanks in advance to any helpful
replies.