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. Race Day Results, Battle for the Title of World's Fastest GTCS

davidathans

Well-known member
Joined
Jul 25, 2004
Messages
703
Location
San Fernando Valley, California
I went out to AutoClub Dragway at California Speedway in Fontana to race Joe De Los Santos this weekend.

I made it out to the track at about 6:45am and there were already hundreds of cars lined up, waiting for the track staff to start passing out the Tech Cards. I waited in the Tech inspection line for over 2 hours and finally "passed" inspection around 10:30am. When i made my way to the pit area to start prepping my car for the race, group 3 (my group) was being called up and groups 1 and 2 had already had their chance to make a pass down the track. So i missed my first call to race, because i had to remove all my tools and put on my slicks.

Joe, called me just as i was finishing bolting up the race tires and let me know that he ran an 11.69 @ 119.8mph and was ready to race me. I thought to myself, "uh oh" because i knew i would have to beat my best e.t. ever to beat him. So, I told Joe that i wanted to have a practice run before i raced him and that we would race right after.

After i ate some lunch, i walked over to the staging lanes, where Joe was lined up getting ready to make his 2nd pass. I congratulated him on his new best e.t. and speed and he showed me his timeslip. He asked me if i got my skinny rims for the front of my car. Unfortunately, one of the rims i was planning to use was warped and the tire would not balance. So, i wished Joe good luck on his 2nd pass and went back to my car to wait for group 3 to be called.

At 12:48pm i got to make my first pass...

with my dad and uncle watching, with my best friend kenny recording video, and with Joe somewhere in the stands scouting out the competition...

I went for it....

Immediate shift from 1st into 2nd after a 2500rpm power brake launch. Another, seemingly immediate shift into 3rd. Pulling hard in 3rd, i hit 6500rpm about 300ft before the finish line. I let off the throttle all the way and then stabbed at it once more while crossing the traps...

I made my way to the ticket booth and i was greeted by a sweet lady, the same one who handed me my first and previously only timeslip in the 11s, with a grin on her face and a look of concern. She immediately checks my car for a roll cage and tells me that i'm too fast to race without one. I said to her, "Don't you have to break 11.49 to need a roll cage?" She showed me my timeslip...

It read:

11.506 @100.28mph

So, she advised me that i couldn't go any quicker without a roll cage and i nodded and sheepishly thanked her (because she didnt kick me out!)

When i pulled up in the pit area, Joe shows up and says something like, "what the hell was that?" or "what the hell did you do?"

I just smiled and opened my trunk.

When i found out Joe was making 498RW torque and 470RWHP after putting on his cat-less midpipe and tuning his car for 100 octane...i knew i would need more than skinnys and moving the battery to the trunk to beat him.

So, how did i beat him?

NOS. Hahahahaha.....surprise!

i took the plunge and bought the edlebrock kit that comes with a plate, the solenoids, hoses, a bottle... the whole works.

I had the car on the dyno on friday, just before the race, to see what my power output would be with Nitrous and to make sure it was safe.

Big Increase!!

Peak values went from 378.8RWHP to 477.5RWHP and torque jumped from 361 ft.-lbs. to 456.9 ft-lbs. at the tires.

Back to the race between Joe and I...

So, i showed him what i had in the trunk and under the hood and my dyno graphs. Unfortunately for us, there were like 500 cars there. Joe mentioned that he had to leave by 2pm and we were going to try and race eachother, but time wasn't on our side.

So, Joe left and I knew i would only get one more race before getting kicked off the track for not having proper safety equipment.

I found a guy in the staging lanes who had a 2007 or 2008 shelby GT500. Turns out he had intake, exhaust, supercharger pulley, and cheater slicks and runs 11.50s. He agreed to race me.

I lined up with him and sprayed right out of the hole again, this time i ran:

11.085 @ 110.14mph.

Beating the Shelby GT500's 11.539 @ 120.25mph.

Once again i ran out of gear way before the 1320 ft. mark. But this time, rather than letting off completely, i backed off and stabbed the pedal down 3 times right at the end to avoid going over 6700rpm.

I almost ran 10s!!!! I would have, if I had the skinny front wheels, or if my tires had a slightly larger diameter or if i were running 3.73 gears.

The 150HP shot of nitrous nearly dropped a full second off my e.t. and would have knocked off more than a second, but my stroker motor might have blown near 7000rpm and i chose my saving my engine over running 10s.
What an amazing experience! One of the greatest days of my life! I hit 100mph at the 1/8 mile mark on both races in under 7 seconds! Using some mathematical modeling, i have estimated the 0 to 60mph statistic in 2.7253 seconds! I even calculated that i pulled a maximum acceleration of 1.06g's.
 
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davidathans

davidathans

Well-known member
Joined
Jul 25, 2004
Messages
703
Location
San Fernando Valley, California
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davidathans

davidathans

Well-known member
Joined
Jul 25, 2004
Messages
703
Location
San Fernando Valley, California
Here are some pictures
 

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clubpro

Well-known member
Joined
Feb 24, 2003
Messages
665
David,

Great job and great times! You and Joe have to come up to Sacramento the first Sunday in May. The Ford Lovers West Coast Nationals is a great day of racing and you will get as many runs in as you want. You and Joe can race each other as many times as you want. I'm sure that we can get a good group of CS owners to come and watch. You won't be disappointed.

Cheers,

Ron
 
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davidathans

davidathans

Well-known member
Joined
Jul 25, 2004
Messages
703
Location
San Fernando Valley, California
Here are some more pictures
 

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davidathans

davidathans

Well-known member
Joined
Jul 25, 2004
Messages
703
Location
San Fernando Valley, California
Here are the pictures of the timeslips and dyno graphs
 

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PNewitt

Guest
All I can say is: WOW.

The first GT/CS to need a roll cage for going too fast!!

If you go any faster, the hood and fenders will fly off your CS! Geesch! And to beat a GT-500? Boy, wait until THAT hits the Shelby message boards!!

You just earned every GT/CS owners their stripes today! Congrats!

Totally Awesome!!

Paul.
 
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PNewitt

Guest
Tell the owner of that GT-500 to bring their pink slip next time they wanna run with ya.

This is a historic day. It will be documented in the book.

David will be famous.

Paul N.
 

Mustanglvr

Well-known member
Joined
Dec 4, 2004
Messages
3,258
:thumb::thumb::thumb:Way To Go David!!!!!! How awesome is that?!!!!
Wish I coulda been there!!!
 

joedls

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Joined
Mar 12, 2005
Messages
1,980
Location
Lake Forest, CA
Congratulations, David!!! I knew you'd get kicked out on your next run. Now get that rollbar installed and get intop the 10s!!!
 

John McGilvary

Well-known member
Joined
Mar 16, 2006
Messages
321
Congrats, David, you and Joe really know how to make an old California Special " go fast freak " smile. Keep them tires smokin.

John
 

robert campbell

Well-known member
Joined
Apr 10, 2007
Messages
4,321
David,
WOW! I love the video of both the dyno session and the race! You have taken your car to another level!! It was very clear in the race video that you pulled off and mashed it a couple times. Most guys would have destroyed their engines!!

Real life example of the “spray”!! Wow! What a great car and engine combo!! I am envious!! Best I have ever been is a high 11.

There is a video of some C06 Corvette puke spanking a slightly modified 2008/2007 GT/CS. He turns consistent 11.5’s with the C06 and loves to race cars it seems he can beat. Can’t tell what part of the country he is in. It is on “truveo.com”. You should post your video on that site!!!! You got him covered big time!

Rob
 

joedls

Well-known member
Joined
Mar 12, 2005
Messages
1,980
Location
Lake Forest, CA
That's a best for that Shelby GT500, too. I talked to that guy last month and on Saturday. His best before the race with David was an 11.6.
 

joedls

Well-known member
Joined
Mar 12, 2005
Messages
1,980
Location
Lake Forest, CA
Once again i ran out of gear way before the 1320 ft. mark. But this time, rather than letting off completely, i backed off and stabbed the pedal down 3 times right at the end to avoid going over 6700rpm.


Hey, David. Something is off with your tach or your tire diameter is shorter than 26". Per my calculator, with 4.11 rear-end gears, a 26" tire, and a 1:1 tranny gear, you should be turning 6642 RPM at 125 MPH & 6908 RPM at 130 MPH. IIRC, you told me you were turning ~6500 RPM when you ran your previus best trap speed of 112 MPH. Per my calculator this should have been more like 5950.

I think with 100 MPH 1/8th, you should be ~128 MPH in the 1/4. That should be ~ 6800 RPM on a 26" tire. On a 28" tire, you should be turning just over 6300.
 
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PNewitt

Guest
Just for fun...

The Green Hornet (EXP-500), back in 1970, did a best time of 14.043 sec. in the quarter.

A 3940 lb car (w/ driver), and a 3.00 rear.

Converted MPH was 101.35

Goodyear F60-15 Tires, 26 lbs. air.

"Shelbyized" EFI 428 CJ engine and C-6 Auto.

Romeo Proving Grounds, Michigan.

-Paul N.
 
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davidathans

davidathans

Well-known member
Joined
Jul 25, 2004
Messages
703
Location
San Fernando Valley, California
Hey, David. Something is off with your tach or your tire diameter is shorter than 26". Per my calculator, with 4.11 rear-end gears, a 26" tire, and a 1:1 tranny gear, you should be turning 6642 RPM at 125 MPH & 6908 RPM at 130 MPH. IIRC, you told me you were turning ~6500 RPM when you ran your previus best trap speed of 112 MPH. Per my calculator this should have been more like 5950.

I think with 100 MPH 1/8th, you should be ~128 MPH in the 1/4. That should be ~ 6800 RPM on a 26" tire. On a 28" tire, you should be turning just over 6300.

Hey Joe, thanks for pointing this out. I ran the numbers myself and i know what you are talking about. I believe my tach is very good, i don't think that is the issue.

There are two factors that change your calculations...
1)Rolling Circumference....i can guarantee that my tires are not 26" in diameter anymore Hahaha..im sure i've burned off at least a 1/4" on both sides...so i'd figure 25.5" diameter. But running the calculations with the circumference associated with a 25.5" diameter would put me at 119.944mph @ 6500rpm or 118.099mph @ 6400rpm...so why was i only doing approx 113mph at 6400-6500rpm crossing the lights before the nitrous? maybe because...
2) Slippage of the torque converter? If i was supposed to be doing 119.944mph @ 6500rpm and i was only doing say 113mph then the slippage in the torque converter is 5.79%. If i was supposed to be doing 118.099mph @6400rpm and i was only doing say 113mph then the slippage in the torque converter is 4.3%.

These percentages seem kind of high though. Shouldn't i only lose 1-2% once the converter is "locked up"?

well any way i look at it....i think im going to end up trying a 28" diameter tire, i just need to make sure it will fit, based on the width of my 9" rear end, backspacing and offset of my rims and spacers and the inside of my wheel wells
 
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