Supercharged or Turbo?
I built my own "kit" for a '72 Valiant, with a 360 Magnum that was pretty much stock except for a HJoley 750, a mild Hughes cam, and some 340 Exhaust manifolds. Unblown, it ran 13.35 with an "open" 3.91 gear on some crappy, 8"-wide BFG Drag radials at sea level.
Sunday, I took it to the strip for the first time with the blower, which is a Vortech V-1, S-trim pretty much "entry-level" centrifugal unit.
I am running a 750 Holley blow-through (see photos) carb on a Crosswind intake, with the same cam (214/218-degrees at .050"-lift; .525" lift, with 114-degree lobe centers.) It is SO mild, it easily idles at only 475 rpm, making 14 inches of vacuum (for the power brake booster.)
ProCharger has a kit for these cars ('67-'76 A Bodies, I think), but I liked the Vortech blower, and got a good deal on one (new, on ebay, for 1 grand), so I made my own mounting plate and fabricated my own oil return, oil supply line, pulley and idler pullley setup (again, see photos), but anyone could do that.
The strip I go to is only 1,000-feet long, so I don't have any legitimate quarter-mile timeslips, but I do have 1,000-foot ones.
Here's what this blower did for me:
ALL 1,000-foot times, running 10 pounds of boost.
60-foot with open 3.91 ratio, unblown = 1.91-sec. hooked up pretty good
60-foot with SureGrip 3.55 ratio, blown = 1.81-sec. Slick track bad wheelspin
1/8th-mile unblown with 3.91 = 8.52-sec
1/8th-mile blown with 3.55 S/G =7.59-sec... almost 1 sec. quicker slick track
1/8th-mile mph unblown... = 82 mph
1/8th-mile mph blown = 93.63 mph
1,000 ft unblown = 11.00-sec. with a 1.91 60-ft
1,000 ft blown = 9.74-sec., with a 1.81 60-ft, which shoulda been lots quicker
Picked up 1.26 sec in 1,000-ft. with the blower.
1,000 ft mph unblown = 92.1 mph
1,000 ft mph blown = 105.04
Picked up 13.03 mph in 1,000 ft blown.
I have used a reliable online calculator to extrapolate these figures to a quarter-mile and here's what the computer says:
Unblown, 13.35 @ 102 mph (ctual run at seal level)
Computer estimate based on the above 1,000-ft times: 11.88 @ 118 mph.
The computer says the blower picked the car up 1.42 seconds and 16 mph in the quarter-mile.
It sure feels like it! When you shift into 3rd, it FEELS like you never shifted;
it just keeps pulling as hard as it was in 2nd... weird! But, I LIKE IT!!!:cheers:
Anti-detonation measures include (I have hypereutectic, cast pistons and stock, composition head gaskets), BoostMaster MSD spark retard, Boost Cooler alky/water injector, and racing (hi-octane) gas.
Two reasons I ran the type setup I chose are:
1. Flat hood; no scoop necessary; real-world stealth...
2. Centrifugal blowers come on slower; less chance to blow the tires off (did anyway)
3. Can't weld; turbo was too ambitious for me.
4. Path of least resistance; this was the easiest thing to do, IMHO.
If anyone has any questions, just email me at [email protected]. I'll try to answer them if I can.
I built my own "kit" for a '72 Valiant, with a 360 Magnum that was pretty much stock except for a HJoley 750, a mild Hughes cam, and some 340 Exhaust manifolds. Unblown, it ran 13.35 with an "open" 3.91 gear on some crappy, 8"-wide BFG Drag radials at sea level.
Sunday, I took it to the strip for the first time with the blower, which is a Vortech V-1, S-trim pretty much "entry-level" centrifugal unit.
I am running a 750 Holley blow-through (see photos) carb on a Crosswind intake, with the same cam (214/218-degrees at .050"-lift; .525" lift, with 114-degree lobe centers.) It is SO mild, it easily idles at only 475 rpm, making 14 inches of vacuum (for the power brake booster.)
ProCharger has a kit for these cars ('67-'76 A Bodies, I think), but I liked the Vortech blower, and got a good deal on one (new, on ebay, for 1 grand), so I made my own mounting plate and fabricated my own oil return, oil supply line, pulley and idler pullley setup (again, see photos), but anyone could do that.
The strip I go to is only 1,000-feet long, so I don't have any legitimate quarter-mile timeslips, but I do have 1,000-foot ones.
Here's what this blower did for me:
ALL 1,000-foot times, running 10 pounds of boost.
60-foot with open 3.91 ratio, unblown = 1.91-sec. hooked up pretty good
60-foot with SureGrip 3.55 ratio, blown = 1.81-sec. Slick track bad wheelspin
1/8th-mile unblown with 3.91 = 8.52-sec
1/8th-mile blown with 3.55 S/G =7.59-sec... almost 1 sec. quicker slick track
1/8th-mile mph unblown... = 82 mph
1/8th-mile mph blown = 93.63 mph
1,000 ft unblown = 11.00-sec. with a 1.91 60-ft
1,000 ft blown = 9.74-sec., with a 1.81 60-ft, which shoulda been lots quicker
Picked up 1.26 sec in 1,000-ft. with the blower.
1,000 ft mph unblown = 92.1 mph
1,000 ft mph blown = 105.04
Picked up 13.03 mph in 1,000 ft blown.
I have used a reliable online calculator to extrapolate these figures to a quarter-mile and here's what the computer says:
Unblown, 13.35 @ 102 mph (ctual run at seal level)
Computer estimate based on the above 1,000-ft times: 11.88 @ 118 mph.
The computer says the blower picked the car up 1.42 seconds and 16 mph in the quarter-mile.
It sure feels like it! When you shift into 3rd, it FEELS like you never shifted;
it just keeps pulling as hard as it was in 2nd... weird! But, I LIKE IT!!!:cheers:
Anti-detonation measures include (I have hypereutectic, cast pistons and stock, composition head gaskets), BoostMaster MSD spark retard, Boost Cooler alky/water injector, and racing (hi-octane) gas.
Two reasons I ran the type setup I chose are:
1. Flat hood; no scoop necessary; real-world stealth...
2. Centrifugal blowers come on slower; less chance to blow the tires off (did anyway)
3. Can't weld; turbo was too ambitious for me.
4. Path of least resistance; this was the easiest thing to do, IMHO.
If anyone has any questions, just email me at [email protected]. I'll try to answer them if I can.
