What kind of power needed to be in the high 10s???

[swinger340]

Thinking about buying my brother in laws 67 fastback barracuda. He is keeping the built 340 in it but If I bought it Im thinking stroker. Has a fresh Built 727 with a boss hog, 3800 stall, Rail connected, Caged with a glass nose. Is already mini tubed with Cal tracs. Perfect set up to beat at the track. Is a high 10 second street car feasible?

 

[70aarcuda]

sure it can run high 10s..9s..8s....just put enough Horsepower in it...

need to be a little more specific as...engine size...converter...trans...suspension.....weight of the car...

 

[1wild&crazyguy]

yes

 

[1wild&crazyguy]

Thinking about buying my brother in laws 67 fastback barracuda. He is keeping the built 340 in it but If I bought it Im thinking stroker. Has a fresh Built 727 with a boss hog, 3800 stall, Rail connected, Caged with a glass nose. Is already mini tubed with Cal tracs. Perfect set up to beat at the track. Is a high 10 second street car feasible?

what gears, tires/height
how much does it weight now?

 

[crackedback]

490hp at 3200# should be enough to get a good chassis in the 10's.. high tens.

 

[Brian Hafliger]

Thinking about buying my brother in laws 67 fastback barracuda. He is keeping the built 340 in it but If I bought it Im thinking stroker. Has a fresh Built 727 with a boss hog, 3800 stall, Rail connected, Caged with a glass nose. Is already mini tubed with Cal tracs. Perfect set up to beat at the track. Is a high 10 second street car feasible?

550HP will get it done easily.

 

[swinger340]

It weighed 3100 with the iron headed 340 in it. Culturally has 3.91s and 275/50/15s. Motor would be an aluminum headed stroker not built yet. Big solid roller cam. Try to tickle 550ish

 

[tubtar]

I think medium solid roller should do the trick and give you much better manners too.
Bigger isn't always better.

 

[rumblefish360]

490hp at 3200# should be enough to get a good chassis in the 10's.. high tens.

THERE ya go! A straight up answer. I was going to say 500 HP should do it.

550HP will get it done easily.

Overkiller! LOL, but ya!

It weighed 3100 with the iron headed 340 in it. Culturally has 3.91s and 275/50/15s. Motor would be an aluminum headed stroker not built yet. Big solid roller cam. Try to tickle 550ish

"Culturally" ???? currently I thinks! LOL!

OK seriously now. I think you have the right idea.More gear perhaps would make it take off and run the time better/easier.

 

[swinger340]

Still trying to purchase the car, so I may be just dreaming. He lost his job and is about to lose his house and he is not sure if he really wants to sell it. One day he says yes and next day is no. Ill have to catch him on one of the days he wants to sell it. Original light blue, 273, black bucket, console car for $2500. Figured it would be a nice body to pound on instead of one of my original 340 cars.

 

[Rodzilla]

I think medium solid roller should do the trick and give you much better manners too.
Bigger isn't always better.

If its a track only car, screw manners, lol. Why not go for the gusto? If high tens is fun,,,,then low ten has to be a riot ;-)

 

[1972DusterPaul]

I found this chart on the internet.

Personally, I am rebuilding my 340 over the Winter looking for 420hp and having a 12 second car (high or low is okay with me)

It shows how much horsepower is needed at the flywheel to run an Elapsed Time in the ¼ mile. This chart is under optimal conditions. The entire car must be set up perfectly to run these times. Very few cars run 100% of their optimum. Wheel spin, slow shifting, clutch slippage, and other factors reduce the amount of usable horsepower.


...................... 2600 2800 3000 3200 3400 3600 3800 4000
15.0 seconds...167.. 180.. 193.. 205.. 218.. 232.. 246.. 257
14.5 seconds...186.. 200.. 213.. 228.. 242.. 256.. 270.. 285
14.0 seconds...206.. 222.. 237.. 253.. 270.. 285.. 301.. 317
13.5 seconds...230.. 248.. 265.. 283.. 300.. 318.. 335.. 353
13.0 seconds...257.. 277.. 297.. 317.. 337.. 357.. 377.. 397
12.5 seconds...289.. 311.. 334.. 356.. 378.. 400.. 423.. 445
12.0 seconds...327.. 352.. 377.. 402.. 428 ..453.. 479.. 504
11.5 seconds...372.. 400.. 429.. 458.. 486.. 515.. 543.. 572
11.0 seconds...425.. 458.. 490.. 523.. 556.. 589.. 620.. 653
10.5 seconds...488.. 526.. 563.. 600.. 638.. 677.. 714.. 751
10.0 seconds...565.. 608.. 652.. 695.. 739.. 783.. 826.. 870

 

[MRGTX]

I found this chart on the internet.

Personally, I am rebuilding my 340 over the Winter looking for 420hp and having a 12 second car (high or low is okay with me)

It shows how much horsepower is needed at the flywheel to run an Elapsed Time in the ¼ mile. This chart is under optimal conditions. The entire car must be set up perfectly to run these times. Very few cars run 100% of their optimum. Wheel spin, slow shifting, clutch slippage, and other factors reduce the amount of usable horsepower.


...................... 2600 2800 3000 3200 3400 3600 3800 4000
15.0 seconds...167.. 180.. 193.. 205.. 218.. 232.. 246.. 257
14.5 seconds...186.. 200.. 213.. 228.. 242.. 256.. 270.. 285
14.0 seconds...206.. 222.. 237.. 253.. 270.. 285.. 301.. 317
13.5 seconds...230.. 248.. 265.. 283.. 300.. 318.. 335.. 353
13.0 seconds...257.. 277.. 297.. 317.. 337.. 357.. 377.. 397
12.5 seconds...289.. 311.. 334.. 356.. 378.. 400.. 423.. 445
12.0 seconds...327.. 352.. 377.. 402.. 428 ..453.. 479.. 504
11.5 seconds...372.. 400.. 429.. 458.. 486.. 515.. 543.. 572
11.0 seconds...425.. 458.. 490.. 523.. 556.. 589.. 620.. 653
10.5 seconds...488.. 526.. 563.. 600.. 638.. 677.. 714.. 751
10.0 seconds...565.. 608.. 652.. 695.. 739.. 783.. 826.. 870

Perfect...you beat me to it! These calculations are pretty reliable when the variables you mention are taken into consideration. The only big question mark is how well calibrated the dyno was...and how different the conditions are at the time of the actual 1/4 mile run. There can be a substantial variation between what the dyno tells you and how much power you're actually making on the strip.

I hang around on the Mustang forums (I have an '11 GT) and the guys on that forum claim to be running 11s with just slicks, to which I said that no 3800 lb car (2011+ Mustang GT with light weight driver) could do this unless the quarter mile was down hill...but they hate science and therefore hated what I had to tell them.

 

[crackedback]

That chart is WAY off and not close to an optimized set up. Any chart that predicts an ET from HP is not going to be good because how a car 60's is going to be a bigger determinant in ET. If it said you'd run X mph, then yeah I'd be more open to the chart, because it's harder to fudge that number.

Explain how this car, ran 6.94/96 in the 1/8 mile which is about an 11.00-11.10 with no more than 480FWHP. Extrapolating it would require about 550hp, yet it runs better, WHY? The car 60's, 1.43, like a 10.00-10.20 car. I'll guess if it was put on the transbrake, it would have gone 1.40 or better.

Video 1
http://imageshack.us/photo/my-images/13/irwindalevids002.mp4/

Video 2 6.94 run
http://imageshack.us/photo/my-images/13/irwindalevids003.mp4/

It's more about how the chassis works and converter efficiency than it is about raw HP. Watch pass time to get an idea about big HP claims and junky running cars.

A 420hp 340 set up right should run 11's in a 3200-3400# car.

 

[rumblefish360]

The chart simpley is a in general ref. it takes into account nothing that can be noted of worth. Chassis, gear ratio, suspension, trans and converter to name the big parts, never mind the little things.

 

[younggun2.0]

EASY AS PIE!

here is my dads 71 demon. has 10:1 451 with box stock eddy heads. 525 lift solid mech. lifter cam. m1 intake and 750 dp. 9" dynamic converter 3.91 gear with 30" hoosier quick time pro. full interior pump gas car. drive it 35 miles to the track, runs 10.60-10.70 at 127mph and drive it home. been on the road for 5 yrs now. fastest street car around our neck of the woods. he only plays with sport bikes on the street anymore. anything else is a waste of time.



[ame=http://i370.photobucket.com/albums/oo147/johnnydart_photo/dads%20car/dadscar003.mp4]

[/ame]

 

[skrews]

Torque curve plays another big part in ET. Example 340 making 500 FW HP vs 416 making 500 FW HP everything else the same. The 416 will run faster times due to better area under the curve power output.

 

[70aarcuda]

yes..torque plays a big part...but it must be matched to the converter...gearing ...tire size..also the chassis must be able to plant the tires and get the car down the track...you need a complete efficient chassis and engine combo working together...60 foot clocks dont lie...

 

[dodge freak]

The lighter the car the better. I would look in to removing weight-from the front would be best.

3,100 lbs is light but once it goes under 3,000 it starts really helping out. Believe its one tenth for every 100 lbs till under 3,000 then its more like one and half tenths for each 100 lbs under 3,000....get it around 2,600 it be a breeze and easier on parts

 

[9secRR]

it comes down to weight and convertor. more weight slower car. convertor not perfect equals back 60'.

my 362'' dynoed 560 hp & 460 ft lbs. at 3800 lbs i run 11.54 @119 mph. 1.70 60'.

my convertor is not matched to my engine, slow 60'.

this engine was in a 2600 lbs Daytona and ran 9.20's @ 148 mph. WEIGHT is a killer.

 

[airwoofer]

It weighed 3100 with the iron headed 340 in it. Culturally has 3.91s and 275/50/15s. Motor would be an aluminum headed stroker not built yet. Big solid roller cam. Try to tickle 550ish

That sounds like a killer deal on that fish and you should jump on it!

Mine weighed 3050 with me in it and has the same 3.91s and 275 DRs. With a worn out 904 and 2500 converter it ran 7.20 / 97 in the 8th with a 1.65 60'. That was with a 500 HP hydraulic cam 416. You will need that 60' to be around 1.50 and like Brian said 550 HP should get you in the 10's.

I am currently in the process of copying the cam / heads of this motor which sounds about like what you are looking for. Mike's solid rollers are little gems.

http://www.forabodiesonly.com/mopar/showthread.php?p=1969460210#post1969460210

 

[bad440]

That chart is WAY off and not close to an optimized set up. Any chart that predicts an ET from HP is not going to be good because how a car 60's is going to be a bigger determinant in ET. If it said you'd run X mph, then yeah I'd be more open to the chart, because it's harder to fudge that number.

Explain how this car, ran 6.94/96 in the 1/8 mile which is about an 11.00-11.10 with no more than 480FWHP. Extrapolating it would require about 550hp, yet it runs better, WHY? The car 60's, 1.43, like a 10.00-10.20 car. I'll guess if it was put on the transbrake, it would have gone 1.40 or better.

Video 1
http://imageshack.us/photo/my-images/13/irwindalevids002.mp4/

Video 2 6.94 run
http://imageshack.us/photo/my-images/13/irwindalevids003.mp4/

It's more about how the chassis works and converter efficiency than it is about raw HP. Watch pass time to get an idea about big HP claims and junky running cars.

A 420hp 340 set up right should run 11's in a 3200-3400# car.

lol pass time=slower than u think it will go cars,some really pathetic running rides,some decent ones too

 

[swinger340]

I know chassis has alot to do with it. My 340 duster runs hand in hand with my buddy's 500 HP 410 duster. He is running a bone stock suspension (with exception of moser axles) with dry rotten bushings, and worn out shocks. The super stock springs, snuber, 3:91s, and 3800 stall work pretty well with the shorter stroked 340.

 

[swinger340]

EASY AS PIE!

here is my dads 71 demon. has 10:1 451 with box stock eddy heads. 525 lift solid mech. lifter cam. m1 intake and 750 dp. 9" dynamic converter 3.91 gear with 30" hoosier quick time pro. full interior pump gas car. drive it 35 miles to the track, runs 10.60-10.70 at 127mph and drive it home. been on the road for 5 yrs now. fastest street car around our neck of the woods. he only plays with sport bikes on the street anymore. anything else is a waste of time.

Very nice.... Id be more than happy with a set up like that.