DusterKrazy
Well-Known Member
Does anyone know what kind of hp and weight are required to do high 7's in the 1/8 mile?? Say 7.90's or in that range??
well 7.70 on the 1/8th equals 11.99 on the quarter so you're probably looking at around 450hp in your average A-body
Very close. 450 h.p. @ 3400 lbs should put you right in the ball park if you don't spin and the car will 60 foot in the 1.8 neighborhood.
what i've posted above is for a normal full weight street combo with 3.5 gears. Less weight and more gears will make it quicker, especially over the eighth
2200 is the target weight. Partial tube chassis but still using leaf spring rear. Aluminum floor/trunk floor/firewall.Lexan..etc.. 4.62 gears. '66 Barracuda.
That's pretty light and it'll leap out of the hole with those gears, but you'll need all three gears for the 1/8th mile. If you ever run the quarter it'll probably run out of revs.
Is this a real car or just in planning stages at the moment? The reason I ask is there's no real reason to strip it down so much if all you want is mid-high sevens over the 1/8th mile. Although losing that big back glass will probably help and you can probably sell the glass for bucks (I hear they're hard to get) to buy other parts.
Personally I wouldn't be cutting the firewall or floor out of a car like this just to replace it with aluminum. What's you local strip rules? Do you need a cage for those times? Down under we don't need a cage until we run quicker than 7.0 on the 1/8th (10.99 for the 1/4).
Get it down to 2800lb (race weight inc driver) and put a nice 1hp/cube 360ci small block in it with 4.1gears and you'll be in the ballpark.
Edit: I came up with this in my head and then decided to double check using my Mopar Chassis book as recommended by "75 Duster 360" above and it concurs.
2800lbs + 360hp = 117-118mph in the quarter (mid 11s)
3000lbs + 360hp = 114mph (high 11s)
3400lbs + 360hp = 109mph (mid 12s)
All time depend on optimum selection of right gears and converter.
A good rule of thumb for converting 1/4 times to 1/8th times is by multiplying ot dividing by 1.555.
If you car runs 11.99 on the quarter divide by 1.555 and it gives you 7.71 on the 1/8th.
It's not precise but close enough for horse shoes and hand grenades
You don't need much. My Demon weighs around 3200# with my 150# self in it, I have not weighed it, but is close to that. It is all steel, with factory buckets in front, just no carpet or back seat.Does anyone know what kind of hp and weight are required to do high 7's in the 1/8 mile?? Say 7.90's or in that range??
2200 is the target weight. Partial tube chassis but still using leaf spring rear. Aluminum floor/trunk floor/firewall.Lexan..etc.. 4.62 gears. '66 Barracuda.
What kind of motor work did you have done if you don’t mind me asking? Thanks!My 360 made 442 HP on the engine dyno. The car runs 7.5-7.6 in the 1/8. Car has 4.56 gear, 4500 stall 8" verter, 28" slicks, and 3400 race weight. 1.58 60' times. DA in the 2500 ballpark.
Cheap hyper SpeedPro flat tops .050 in the hole, 9.6 comp, .484 MP hyd cam, moderately worked iron heads, RPM intake, 750 Holley, 1.75 headers. Motor ran awesome for what it was. Eventually ran 11.0 in the 1/4 with a .528 solid cam and 5200 converter.What kind of motor work did you have done if you don’t mind me asking? Thanks!
Ohh ok awesome! I’m building a 72 scamp. It’s going to have no back seat, no steel gas tank, no heater box, etc. Looking to go between mid 7.30s-7.50s. Have everything but the motor figured out. 4300-4500 converter, 904 trans with low first gear set,race clutches, etc. And an 8.75 with 4.30 or 4.56 gears. Just trying to get ideas for the motor. Thanks!Cheap hyper SpeedPro flat tops .050 in the hole, 9.6 comp, .484 MP hyd cam, moderately worked iron heads, RPM intake, 750 Holley, 1.75 headers. Motor ran awesome for what it was. Eventually ran 11.0 in the 1/4 with a .528 solid cam and 5200 converter.
Buy the best converter you can afford....that will make or break your combo...buy an 8 inch converter not a 10 inch....