davidathans
Well-known member
As many of you already know, i've been spending money like crazy trying to get my car to run in the 10s for the first time. Here is my story...
The last time i raced was December 6, 2008. Back then i had a 4.11 gear ratio and just installed an edlebrock nitrous wet shot on the car. I didn't get to race Joe De Los Santos, but instead I raced this guy Ed who has a 2007 Shelby GT-500 with intake, exhuast, supercharger pulley, stock 3.31 gears and cheater slicks. I beat the shelby with a 11.085 @ 110.14mph on a 1.668 60' time having to back on and off the gas because i ran out of gear (6700rpm 300 ft before the finish line) to his 11.539 @ 120.25 (he went through the lights in the top of his 3rd gear). Running on the lean side w/o N20, the mustang put down 378RWHP @ 6500rpm and 361lb.-ft torque and with a 150HP shot of Nitrous it put down 478RWHP and 456lb.-ft. torque, but those numbers were with a 4.11 gear and an auburn limited slip differential.
After the races in December, my plan was to change the 4.11 gear to a 3.70 gear so i could pull all the way through the traps without having to back off the gas. I was planning to spend only about $1000....
When i went to do the gear swap, found out the 3rd member was toast. The gear case was cracked and the metal inside the Auburn was coming apart!
I ended up spending $4,666.66 + $78.95 on gas to break in the rear end before racing it. But the $4,666.66 includes:
Nitrous Express Pressure Activated Sensor Bottle Warmer $275.95
Weld racing 3.5x15" aluminum Draglite Skinny rims (i already had bought the tires for these in Dec.) $191. 95 each
Lug nuts $29.38
3.70 ring and pinion set and a ford 9" master kit with shims, bolts, gasket and bearings $225 + $125 (had to buy another bearing kit because the bearings were too small for the currie gear case, +$125 more)
Painless wiring switch panel with 8 fused switches (to safely rewire the NOS, Heater, and elec fuel pump) $319.95
nitrous blow down tube $24.95
Eaton Detroit Locker for 31 spline axles $519.95
MSD RPM Chip set (6700 rpm chip installed) $26.95
Currie Sportsman 9" gear case $235.00
Currie Aluminum Big Bearing Support cover $123.00
Strange Billet Yoke for Big Bearing Center $115.00
New U joint conversion 1310/3R $37.99
Speedometer/Odometer recalibration $305.30
National Parts Depot (new rocker panel mouldings, door sills, dome light, brake pedal) $116.59
Labor to do work on rear end and wire in switch panel 8 hours at $105.00 per hour-$840
Fill up Nitrous bottle and buy Too much pressure blowoff fitting $88.71
Dyno tune carbureteor $200
Oil change and two dyno pulls $207
12.5 gallons of 100 octane fuel $100
Mount and balance skinny tires on skinny rims $20
$20 to race at Autoclub Dragway
+misc heavy shock proof gear oil, brake cleaner, hardware
+ tax on alot of the above brings total to $4666.66
AND NOW FOR THE FUN PART!
Love the 3.70 gears and detroit locker! Every time you touch the pedal you feel the locker lock! The 3.70 gears allow me to do 70mph at 3600rpm instead of 4000rpm!
The only part i don't like is the loss of torque at the wheels, which is significant.
Dyno #s changed from the tune and gear/rear end changes:
Without Nitrous:
Before: 378RWHP and 361lb.-ft. Running lean with 4.11 gears and Auburn limited slip
Now: 351RWHP and 296lb.-ft. Running rich with 3.70 gears and detroit locker
with Nitrous:
Before: 478RWHP and 456lb.-ft. Running right on (12.7-13.0 air fuel ratio) with 4.11 gears and Auburn limited slip
Now: 469RWHP and 404lb.-ft. Running extremely rich (off the wide band meter's scale, less than 10.0:1 air to fuel ratio)
Went 3 jet sizes bigger on the primaries of the carburetor, from Holley size 71 to Holley size 74 (secondaries are still Holley size 79) but now its running too rich, but thats safer than being lean.
Made it out to the track and prepped the car to race and got my first race at 9:23 am.
Ran the car twice without nitrous to see how the 3.70 gears affect the performance:
12.434 @ 108.81mph on a 1.817 60' time (8th mile in 7.944 @ 88.58mph) hit 5900rpm through the traps
12.529 @ 107.54mph on a 1.799 60' time (8th mile in 7.999 @ 87.73mph) hit 5800rpm through the traps
Being about half a second slower than i was with the 4.11 gears, because of the 3.70 gears and the heat (100 degrees), i didn't think there was any way i would even get close to running 10s because the nitrous knocked off about 1 second in December and i would need to knock off about 1.5 seconds this time.
At 11:24am i went for it with the nitrous, spraying right out of the hole.
Picked the left front wheel off the ground for the first time! probably about a centimeter!
Pulled a 1.615 60' time!
Through the 8th mile in 7.068 @ 99.11mph!
11.042 at 120.85mph!!!!
Knocked off just about 1.5 seconds!
And they didn't kick me off the track for not having a roll cage!
I got another chance to try to hit 10.99
at 12:11am
pulled a 1.700 60' time
through the 8th mile in 7.132 @ 99.44mph
finished with an 11.088 @ 124.08mph!!!
still didnt get kicked off the track....hoping that there was enough Nitrous left in the bottle for one more chance to run 10s!
Lined up against the same shelby GT-500 from december, but this time he has 3.73 gears instead of the stock 3.31 gears.
Last race was at 1:21pm
pulled a 1.658 60' time!
through the 8th mile in 7.220 @ 95mph (Awwwww ran out of Nitrous in 2nd gear)
finished with a 11.371 @ 118.43 mph
to beat the shelby who did 11.928 @ 116.98.
So after spending close to $5000, i almost ran 10s and probably would have if it weren't for the tune being too rich and the weather being so hot (everyone i talked to, including the shelby gt500 was running at least 3 tenths of a second slower than usual that day)
And the fun didnt end there. I have my MSD 6AL ignition box mounted on the floor up by the passengers feet and it tends to overheat when its hot. On the drive home, my tach signal started to bounce all over the place, and when i made it to the 101, 405 interchange where i hit traffic and 106 degree heat, i lost my spark and the car died and i sat on the shoulder of the freeway for 45 minutes trying to let it cool, so i could drive it home....never happened...its toast! had to get toed home!
Well, that's my story...i'm pretty much broke now haha so it will be a while before i get another chance to run 10s.
Now my new best e.t. is 11.042 down from a 11.085 and my new best speed is 124.08mph up from 112.81mph.
Check out the pictures of the timeslips and the dyno graphs! And a few good shots from the track!
The last time i raced was December 6, 2008. Back then i had a 4.11 gear ratio and just installed an edlebrock nitrous wet shot on the car. I didn't get to race Joe De Los Santos, but instead I raced this guy Ed who has a 2007 Shelby GT-500 with intake, exhuast, supercharger pulley, stock 3.31 gears and cheater slicks. I beat the shelby with a 11.085 @ 110.14mph on a 1.668 60' time having to back on and off the gas because i ran out of gear (6700rpm 300 ft before the finish line) to his 11.539 @ 120.25 (he went through the lights in the top of his 3rd gear). Running on the lean side w/o N20, the mustang put down 378RWHP @ 6500rpm and 361lb.-ft torque and with a 150HP shot of Nitrous it put down 478RWHP and 456lb.-ft. torque, but those numbers were with a 4.11 gear and an auburn limited slip differential.
After the races in December, my plan was to change the 4.11 gear to a 3.70 gear so i could pull all the way through the traps without having to back off the gas. I was planning to spend only about $1000....
When i went to do the gear swap, found out the 3rd member was toast. The gear case was cracked and the metal inside the Auburn was coming apart!
I ended up spending $4,666.66 + $78.95 on gas to break in the rear end before racing it. But the $4,666.66 includes:
Nitrous Express Pressure Activated Sensor Bottle Warmer $275.95
Weld racing 3.5x15" aluminum Draglite Skinny rims (i already had bought the tires for these in Dec.) $191. 95 each
Lug nuts $29.38
3.70 ring and pinion set and a ford 9" master kit with shims, bolts, gasket and bearings $225 + $125 (had to buy another bearing kit because the bearings were too small for the currie gear case, +$125 more)
Painless wiring switch panel with 8 fused switches (to safely rewire the NOS, Heater, and elec fuel pump) $319.95
nitrous blow down tube $24.95
Eaton Detroit Locker for 31 spline axles $519.95
MSD RPM Chip set (6700 rpm chip installed) $26.95
Currie Sportsman 9" gear case $235.00
Currie Aluminum Big Bearing Support cover $123.00
Strange Billet Yoke for Big Bearing Center $115.00
New U joint conversion 1310/3R $37.99
Speedometer/Odometer recalibration $305.30
National Parts Depot (new rocker panel mouldings, door sills, dome light, brake pedal) $116.59
Labor to do work on rear end and wire in switch panel 8 hours at $105.00 per hour-$840
Fill up Nitrous bottle and buy Too much pressure blowoff fitting $88.71
Dyno tune carbureteor $200
Oil change and two dyno pulls $207
12.5 gallons of 100 octane fuel $100
Mount and balance skinny tires on skinny rims $20
$20 to race at Autoclub Dragway
+misc heavy shock proof gear oil, brake cleaner, hardware
+ tax on alot of the above brings total to $4666.66
AND NOW FOR THE FUN PART!
Love the 3.70 gears and detroit locker! Every time you touch the pedal you feel the locker lock! The 3.70 gears allow me to do 70mph at 3600rpm instead of 4000rpm!
The only part i don't like is the loss of torque at the wheels, which is significant.
Dyno #s changed from the tune and gear/rear end changes:
Without Nitrous:
Before: 378RWHP and 361lb.-ft. Running lean with 4.11 gears and Auburn limited slip
Now: 351RWHP and 296lb.-ft. Running rich with 3.70 gears and detroit locker
with Nitrous:
Before: 478RWHP and 456lb.-ft. Running right on (12.7-13.0 air fuel ratio) with 4.11 gears and Auburn limited slip
Now: 469RWHP and 404lb.-ft. Running extremely rich (off the wide band meter's scale, less than 10.0:1 air to fuel ratio)
Went 3 jet sizes bigger on the primaries of the carburetor, from Holley size 71 to Holley size 74 (secondaries are still Holley size 79) but now its running too rich, but thats safer than being lean.
Made it out to the track and prepped the car to race and got my first race at 9:23 am.
Ran the car twice without nitrous to see how the 3.70 gears affect the performance:
12.434 @ 108.81mph on a 1.817 60' time (8th mile in 7.944 @ 88.58mph) hit 5900rpm through the traps
12.529 @ 107.54mph on a 1.799 60' time (8th mile in 7.999 @ 87.73mph) hit 5800rpm through the traps
Being about half a second slower than i was with the 4.11 gears, because of the 3.70 gears and the heat (100 degrees), i didn't think there was any way i would even get close to running 10s because the nitrous knocked off about 1 second in December and i would need to knock off about 1.5 seconds this time.
At 11:24am i went for it with the nitrous, spraying right out of the hole.
Picked the left front wheel off the ground for the first time! probably about a centimeter!
Pulled a 1.615 60' time!
Through the 8th mile in 7.068 @ 99.11mph!
11.042 at 120.85mph!!!!
Knocked off just about 1.5 seconds!
And they didn't kick me off the track for not having a roll cage!
I got another chance to try to hit 10.99
at 12:11am
pulled a 1.700 60' time
through the 8th mile in 7.132 @ 99.44mph
finished with an 11.088 @ 124.08mph!!!
still didnt get kicked off the track....hoping that there was enough Nitrous left in the bottle for one more chance to run 10s!
Lined up against the same shelby GT-500 from december, but this time he has 3.73 gears instead of the stock 3.31 gears.
Last race was at 1:21pm
pulled a 1.658 60' time!
through the 8th mile in 7.220 @ 95mph (Awwwww ran out of Nitrous in 2nd gear)
finished with a 11.371 @ 118.43 mph
to beat the shelby who did 11.928 @ 116.98.
So after spending close to $5000, i almost ran 10s and probably would have if it weren't for the tune being too rich and the weather being so hot (everyone i talked to, including the shelby gt500 was running at least 3 tenths of a second slower than usual that day)
And the fun didnt end there. I have my MSD 6AL ignition box mounted on the floor up by the passengers feet and it tends to overheat when its hot. On the drive home, my tach signal started to bounce all over the place, and when i made it to the 101, 405 interchange where i hit traffic and 106 degree heat, i lost my spark and the car died and i sat on the shoulder of the freeway for 45 minutes trying to let it cool, so i could drive it home....never happened...its toast! had to get toed home!
Well, that's my story...i'm pretty much broke now haha so it will be a while before i get another chance to run 10s.
Now my new best e.t. is 11.042 down from a 11.085 and my new best speed is 124.08mph up from 112.81mph.
Check out the pictures of the timeslips and the dyno graphs! And a few good shots from the track!
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