400 horses is what i want
03-30-2008, 06:49 PM
#11
3rd Gear Member
Join Date: Jun 2006
Location: oklahoma
Posts: 643
RE: 400 horses is what i want
i would freshen up the bottom end. add 3/8 rod bolts arp mains etc. built it right then add some h/c/i of your choice my suggestion is afr 165 with a custom grind comp with a bbk intake and add a single turbo. with a 67mm and about 8-10 bls boost and a good tune you will easily get 400+ rwhp prolly around 475 to be realistic and as long as your not boosting you should get 20+. with my old setup (in the sig) i got 22-23 around town and 25-26 on the highway.
03-30-2008, 08:03 PM
#12
Thread Starter
Join Date: Mar 2008
Posts: 4
RE: 400 horses is what i want
Yes, actually he is now that you mention it. I had forgot about the nos factor. But something is confusing me, he can hit numbers higher than that with the nos though. So can you get more or less depending on how you want to run out of nos?
03-30-2008, 08:12 PM
#13
3rd Gear Member
Join Date: Jul 2007
Location: Beaufort,NC
Posts: 719
RE: 400 horses is what i want
I damn say not ture. my friend has a 331 stroker and a chip and he pushs 350+hp and he just added Nos.It can be done.
Mine should be in the 300+ range
302-dipped and bored over 20
fitted with no gap rings,and forged pistons and rods
racing heads,toker intake,and 600cfm 4bbl holly
p&p heads and exhast ports
and longtubes headers
C4-rebuild with a stage 2 shift kit
9" rear end pois-trac
Mine should be in the 300+ range
302-dipped and bored over 20
fitted with no gap rings,and forged pistons and rods
racing heads,toker intake,and 600cfm 4bbl holly
p&p heads and exhast ports
and longtubes headers
C4-rebuild with a stage 2 shift kit
9" rear end pois-trac
03-30-2008, 10:54 PM
#14
M.A.D. Motorsports
Join Date: Jul 2006
Location: Indiana
Posts: 8,014
RE: 400 horses is what i want
ORIGINAL: 67mustang302
My 302 is prolly up around 385hp at the crank, and I get about 20-22 on the highway with a carburetor and no overdrive. The reason so many people have built 302's that get such crappy mileage is cuz they overbuild. The heads or the intake or something is too big, and efficiency drops off and mileage along with it. That's why I went with AFR 165's and not 185's, a 570cfm carb instead of a 670 etc. Yeah, it might be costing me some peak hp, but average top end power ain't all that different, and mileage is better. Most of my driving is under 3,000rpm anyway, so why build an engine to sacrifice power there just to get an extra 15-20 peak hp?
Look at the Formula 1 teams, they design their heads to have the smallest ports possible. They get them to flow just as much as they need with as small a port as they can so that their velocity stays as high as possible. Currently they're running induction charge speeds in the intake port at the head of close to 800mph(yes, the induction charge exceeds the speed of sound as it approaches the valves). They're approaching 140% volumetric efficiency and making over 5hp per cubic inch naturally aspirated.
Everyone spends too much time reading cylinder head flow charts, and not nearly enough time looking at port velocities. All the cylinder head flow in the world is completely worthless without velocity, if there's no airflow velocity then there's no airflow into the cylinder, and it's not filling. Induction velocity has a HUGE impact on mileage and power.
My 302 is prolly up around 385hp at the crank, and I get about 20-22 on the highway with a carburetor and no overdrive. The reason so many people have built 302's that get such crappy mileage is cuz they overbuild. The heads or the intake or something is too big, and efficiency drops off and mileage along with it. That's why I went with AFR 165's and not 185's, a 570cfm carb instead of a 670 etc. Yeah, it might be costing me some peak hp, but average top end power ain't all that different, and mileage is better. Most of my driving is under 3,000rpm anyway, so why build an engine to sacrifice power there just to get an extra 15-20 peak hp?
Look at the Formula 1 teams, they design their heads to have the smallest ports possible. They get them to flow just as much as they need with as small a port as they can so that their velocity stays as high as possible. Currently they're running induction charge speeds in the intake port at the head of close to 800mph(yes, the induction charge exceeds the speed of sound as it approaches the valves). They're approaching 140% volumetric efficiency and making over 5hp per cubic inch naturally aspirated.
Everyone spends too much time reading cylinder head flow charts, and not nearly enough time looking at port velocities. All the cylinder head flow in the world is completely worthless without velocity, if there's no airflow velocity then there's no airflow into the cylinder, and it's not filling. Induction velocity has a HUGE impact on mileage and power.
03-30-2008, 11:04 PM
#15
6th Gear Member
Join Date: Apr 2007
Location: California
Posts: 10,468
RE: 400 horses is what i want
AFR 165's, long rod 302, Crane Cobra replacement cam, Weiand 8124 intake with a 570cfm Holley, long tubes, h pipe. It's a Toploader 4spd, but 4th is still 1:1. Only a 3.00 gear though. I drive 65mph too, not 80 like some folks.
03-31-2008, 12:55 AM
#16
5th Gear Member
Join Date: Mar 2006
Location: San Antonio Tx
Posts: 2,271
RE: 400 horses is what i want
Just spray or turbo it. If you spray it youll only be using more fuel while spraying, and if you keep your foot out of the gas until needed the turbo wont affect mileage too much either.
03-31-2008, 01:00 AM
#17
2nd Gear Member
Join Date: Feb 2008
Location: CT
Posts: 353
RE: 400 horses is what i want
I know it can be done because my buddy has a mustang just like mine that is pushin about 430 and he gets great gas millage.
Your friend is lying to you. it's that simple. Don't build your car to 400 HP if you expect to get 20 MPG Otherwise, I say an exceptional 347 NA, or a 331 with some spray.
Your friend is lying to you. it's that simple. Don't build your car to 400 HP if you expect to get 20 MPG Otherwise, I say an exceptional 347 NA, or a 331 with some spray.
03-31-2008, 01:02 AM
#18
3rd Gear Member
Join Date: Jul 2007
Location: Beaufort,NC
Posts: 719
RE: 400 horses is what i want
I woudl just stroke it out and run it like that put spray on it if you like but gas will become a problem.My toy is only driven once a week because gas is getting high over here and it likes a lot of gas!!! besides i got a lead foot
03-31-2008, 05:17 AM
#19
M.A.D. Motorsports
Join Date: Jul 2006
Location: Indiana
Posts: 8,014
RE: 400 horses is what i want
ORIGINAL: 67mustang302
AFR 165's, long rod 302, Crane Cobra replacement cam, Weiand 8124 intake with a 570cfm Holley, long tubes, h pipe. It's a Toploader 4spd, but 4th is still 1:1. Only a 3.00 gear though. I drive 65mph too, not 80 like some folks.
AFR 165's, long rod 302, Crane Cobra replacement cam, Weiand 8124 intake with a 570cfm Holley, long tubes, h pipe. It's a Toploader 4spd, but 4th is still 1:1. Only a 3.00 gear though. I drive 65mph too, not 80 like some folks.