How would you build a low 10’s street car

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krazykuda said:
A boosted car should be in the 8's for compression...

Turbos have a lag and will handicap you off the line... Superchargers don't have the lag...

a 2.91 gear in a 10 second car... View attachment 1715381834

I want some of what you're smoking.... View attachment 1715381832
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I would give you whatever I’m smoking if that was the case but I don’t smoke lol nor do I drink just a guy wanting to learn more about cars and engine builds only reason I said 2.91’s was for highway cruising, I’ve heard 7lbs of boost can double hp was thinking I could run up to 10 and still be okay maybe do it on e-85 to keep from detonation and keeping the higher cr to get my *** off the line and have the turbo put the power down from there
 
1970boy said:
I would give you whatever I’m smoking if that was the case but I don’t smoke lol nor do I drink just a guy wanting to learn more about cars and engine builds only reason I said 2.91’s was for highway cruising, I’ve heard 7lbs of boost can double hp was thinking I could run up to 10 and still be okay
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I was going to go pro charged one time. I talked to the people, 2500 bolt on. They did 10 lbs on a 13.30 E body w/360 and ran 10's. Obviously, you'd have to have a tranny/converter that can take it, safety equipment such as a cage, and all the other things that go along with a car like that including traction
 
1970boy said:
I would give you whatever I’m smoking if that was the case but I don’t smoke lol nor do I drink just a guy wanting to learn more about cars and engine builds only reason I said 2.91’s was for highway cruising, I’ve heard 7lbs of boost can double hp was thinking I could run up to 10 and still be okay maybe do it on e-85 to keep from detonation and keeping the higher cr to get my *** off the line and have the turbo put the power down from there
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It's good that you're trying to think outside the box, but unless you get something like a new Demon, Hellcat, or Shelby, it's gonna be difficult to build a 10 second street car...

Then anything that can run 10 seconds is not going to get good MPG....
 
Oldiron440 said:
Isn't the barracuda fastback the heaviest Abody?
At 3600 pounds with driver you will need approximately 600 horsepower to run 10.50.
Now 600 big blocks that are street driven aren't a problem and the formula is easy and straight forward but a 600 hp small block is somthing else, hyper and temperamental come to mind.
And if you want reliability your 600 hp could cost you 9 to 14 k.
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Thankyou for giving me some figures that helps a good bit, my plan was to overbuild the internals to reach the reliability I want, 600 seems pretty doable with a turbo’d small block also the small block would help with the weight savings, I think my next move might be getting my car weighed to see exactly where I’m at then I can try and figure the hp and gearing I would need
 
There is a guy on this site that has a 10 second 318 in a Volare. It has a 4" crank. All throttle. Street car.
 
krazykuda said:
It's good that you're trying to think outside the box, but unless you get something like a new Demon, Hellcat, or Shelby, it's gonna be difficult to build a 10 second street car...

Then anything that can run 10 seconds is not going to get good MPG....
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Yeah that’s understandable I figured a lower numerical gear to help with mileage along with the gear vendors unit hooked up with my four speed to try and get decent mpg when keeping my foot out of it, just looking for above 10mpg maybe 12mpg lol nothing outstanding
 
Lets start at the front.
Engine, 10k
Trans. 3k
Converter. 1k
Rear end. 2k
Cage. 3k
Wheels and tires 1k

Total. 20k

Maybe more maybe less but those numbers are close.
 
Cope said:
Lets start at the front.
Engine, 10k
Trans. 3k
Converter. 1k
Rear end. 2k
Cage. 3k
Wheels and tires 1k

Total. 20k

Maybe more maybe less but those numbers are close.
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Thanks for the numbers was looking to know those soon so I could figure some saving for the build, I understand going fast costs money that’s why I wanted to see about running through the build on paper so I could see what was need if my goals could be met then I could save and gather parts over time
 
My 68 Barracuda is 3650 with me in it; and that's with an Aluminum top end,a Passon aluminum trans box, an 8.75, 4 aluminum slot mags, a GVod, powersteering and power brakes,and no AC.. The fold-down rear seat will take 64# off that, and the TTI dual 3" system will shed another 72#, the bumpers are 30 and the heater is 16, and I was at 195 with helmet. 3467 is the lightest that I could easily make it
But I have a 360 so 3650 is nothing to her.
According to the Bulletin Book a 10.2 requires a P/W ratio of .179..... with a SuperStock suspension. If you get yours down to 3400 with you in it;that would be 3400 x .179=609hp. But if yur gonna run street suspension , you'll need more power for a 10.2. 700 might do it.
609 from a 340, and into a 4-speed is not something you wanna build as yur first project.

A mid 12 with street suspension at 3400 works out to 3400 x .104=350hp, an easy target for a 340. And a heck of a fun street car. At 400 hp and still clutched, she won't like 2.94s;forget thatchit. With a 2.66 low gear, she'll be ornery with anything less than 4.10s. 400hp with a 340 is about a 245* @.050 cam. And don't even think about fuel mileage. Between that cam and 4.10s, you'll blow thru a tank of gas in a couple of hours, on a good day.
A know a couple of guys around here with ~500hp 340s,normally aspirated. They don't drive them. They trailer them to the shows; Start 'em up to get on/off the trailers, blip the throttles a few times, idle around the fairgrounds, and trailer them home. That's what guys do with a 500hp NA340.
With a 350 hp 340, you drive it everywhere all the time, and slide her sideways every chance you get; 10,000 miles a year. By 400 it is fast becoming a weekend warrior, and you are thinking " you shouldda had a 367". and by 430hp it drinks $100 bucks of gas every weekend and around here that is a days pay, so you better get married so somebody can afford the mortgage payments. And if it throws a rod bearing you better have some comfortable walking shoes.
Or is it just me that thatchit happens to? lol
low tens with a street 340/4-speed @3400#, yur geared for a trap of over 130 mph; that's 4.30s with 28s at least. With the GVod that comes to 2600@65mph
Yeah the 67-8-9 Barracudas are the tank A-bodies of those years, but daymn they are good-looking. and they accept 295s back there in the factory tubs, with plenty of room to spare..
 
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Turbos,if you tune with the laptop you can have what you want.If you really want to go fast and cruise put a 200r4 adapted in and make the chassis as efficient and light as possible.I figure if you got real lucky and did as much work as possible you might do it for 10-15k on top of what you have now. It can be done but it takes the latest technology and a wheelbarrow of cash.This car is a 7 second car and will haul the groceries with ease on pump gas.
 
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Well you dont NEED turbos.....

20190609_154528_zpsbs3dgvcr.jpg


Im hopefull this will do it.....

:poke::rofl:
 
My good buddy is a old school blower guy,hes building a pontiac 400 with a 671 now. He can do ok on gas mileage but lets face it you can make a turbo motor run like a well tuned 6 banger and with a few keystrokes and some race gas run insane numbers.
 
lead69 said:
My good buddy is a old school blower guy,hes building a pontiac 400 with a 671 now. He can do ok on gas mileage but lets face it you can make a turbo motor run like a well tuned 6 banger and with a few keystrokes and some race gas run insane numbers.
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That’s what I’m hoping for decent mpgs when not driven hard and power when I want it from the turbos, 10’s is my goal simply because 10’s is my goal call me crazy and what have you everyone’s got a dream this is mine a 10 second car that could behave in the streets and get okay mileage, I feel like turbos would do the trick along with other things in a well tuned we’ll matched combo
 
Gas mileage, what the hell is that?

I already need fuel every time i fire up and thats not even 500 Hp....

Not to mention my 250 dollar DOT slicks last about a month, i cant really drive on the HWY, Its about 115 degrees in the car, you cant really see to change lanes beacuse of the race seats and cage, no wipers and no AC but other than those few things its great on the street.....

:poke:
 
AJ/FormS said:
My 68 Barracuda is 3650 with me in it; and that's with an Aluminum top end,a Passon aluminum trans box, an 8.75, 4 aluminum slot mags, a GVod, powersteering and power brakes,and no AC.. The fold-down rear seat will take 64# off that, and the TTI dual 3" system will shed another 72#, the bumpers are 30 and the heater is 16, and I was at 195 with helmet. 3467 is the lightest that I could easily make it
But I have a 360 so 3650 is nothing to her.
According to the Bulletin Book a 10.2 requires a P/W ratio of .179..... with a SuperStock suspension. If you get yours down to 3400 with you in it;that would be 3400 x .179=609hp. But if yur gonna run street suspension , you'll need more power for a 10.2. 700 might do it.
609 from a 340, and into a 4-speed is not something you wanna build as yur first project.

A mid 12 with street suspension at 3400 works out to 3400 x .104=350hp, an easy target for a 340. And a heck of a fun street car. At 400 hp and still clutched, she won't like 2.94s;forget thatchit. With a 2.66 low gear, she'll be ornery with anything less than 4.10s. 400hp with a 340 is about a 245* @.050 cam. And don't even think about fuel mileage. Between that cam and 4.10s, you'll blow thru a tank of gas in a couple of hours, on a good day.
A know a couple of guys around here with ~500hp 340s,normally aspirated. They don't drive them. They trailer them to the shows; Start 'em up to get on/off the trailers, blip the throttles a few times, idle around the fairgrounds, and trailer them home. That's what guys do with a 500hp NA340.
With a 350 hp 340, you drive it everywhere all the time, and slide her sideways every chance you get; 10,000 miles a year. By 400 it is fast becoming a weekend warrior, and you are thinking " you shouldda had a 367". and by 430hp it drinks $100 bucks of gas every weekend and around here that is a days pay, so you better get married so somebody can afford the mortgage payments. And if it throws a rod bearing you better have some comfortable walking shoes.
Or is it just me that thatchit happens to? lol
low tens with a street 340/4-speed @3400#, yur geared for a trap of over 130 mph; that's 4.30s with 28s at least. With the GVod that comes to 2600@65mph
Yeah the 67-8-9 Barracudas are the tank A-bodies of those years, but daymn they are good-looking. and they accept 295s back there in the factory tubs, with plenty of room to spare..
Click to expand...

Pretty good info here^^^^^^^^^^^but with room to spare, not so much
IMG_0137 (1).JPG

295 60 d15
 
My opinion. Find a 67-69 valiant 2 door post and turn it into a drag car. Lighter, and stiffer from the get go. If you cut it up, you wont regret it as much later on.
 
Cope has the $$$$ numbers pretty close to right...will probably cost more (5k ish if I had to guess).

Making a low 10 second power plant is not too hard, but making it street friendly too can be tough. My 67 Barracuda is a low 10 second street car, naturally aspirated 408 on e85. I drive it on the street quite a bit and race a lot. It is not the most street friendly car, but I don't mind it.

Building a turbo car would probably be cheaper than building an NA car; however, both will need the same safety parts, built trans, good converter, good suspension, good tires, good brakes (often overlooked), frame connectors, cage, etc.
 
krazykuda said:
I measured a 67 Barracuda Formula S factory A/C car without the under hood A/C components except the condenser (with A/C HVAC still in) in college for a project and it weighed 2940 lbs.... Oh yeah, it also had a factory console shift...
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Mine weighs 3245 with 2 gallons of fuel in it. It has no heater box or Fender splash shields,console car and original ac car, ac is gone. It has a driveshaft loop, but that’s it on the plus side. Second generations fastbacks are FAT! I’m 300 lbs fatter than a 70 duster I run against and neither are cut up. You going to put a bar/cage in the car? If so, not a good idea to drive it on the street with no helmet. Oh and all the undercoat removed. This is according to my longacre scales.
 
The console and rear folding seat on a fastback must weigh 200#s... lol
I couldn't believe how heavy they are !
 
Here is a short list of what I can think of off the top of my head of what is in my 10 second street car....

67 Barracuda, 3250 lbs in street trim…..

· 360 block, 4” Scat forged crank, Scat I-beams, Icon forged flat top pistons, ATI balancer
· Ported Edelbrocks, 57cc, Comp Pro Mag rockers, Smith Brothers oil through custom pushrods
· Hughes solid cam 264/268 @ 0.050, ~ 0.620 lift, Howards EDM direct lube lifters, PAC springs
· 13:1 compression, Holley XP 950 e85 carb, Victor intake (port matched), super sucker
· MSD distributor, coil, and 6AL box, NGK R5671A-7 plugs
· 1 ¾ Headman Hustlers headers
· 727 race trans w/ manual valve body (turbo action), bolt in sprag, 8” PTC converter
· 3” exhaust with Dynomax race bullets
· MO875 rear end, back braced, 35 spline axels, spool, 4.10 gears
· Weld Draglites with Hoosier drag radials (275/60/r15)
· Full Caltrac setup (mono leafs, link bars and shocks front and rear)
· Mini tubbed, frame connectors, roll cage, 4 wheel disc brakes
· Becool radiator, 2007 Chevy HHR fan
· Racing seats, belts, gauges, aftermarket shifter, fuel cell (and building a rear fire wall), battery relocation kit, Holley Black pump

I'm sure I'm forgetting a lot of stuff...but I'm at work, and this is all I could think of off the top of my head. As you can see, a lot of expensive parts...plus you need the know how of what to do with said parts, and the know how of how to tune the car (as a whole) to make it run well.
 
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