345s-bspinnin
Enthusiast
One Sunday afternoon at the Texas Mile, two runs and no more.
Shakedown pass: 188.3mph
Flatout: 195.0 mph - hitting rev limiter before the mile marker
I had not planned on participating at this Texas Mile event. I was going to spectate on Saturday, but had some surprise family visit (for my bday ). Well, said family decided they would like to spectate the Texas Mile event on Sunday. Furthermore, they said would like to see me run. I called some contacts at the Texas Mile, and they agreed to add me to the waiting list for Sunday. So, I threw the car in trailer, family in SUV and headed to Beeville, TX on Sunday morning. As some of you may recall, I ran a 191.5 back in March (CLICK ME for thread). Since then, I have added a throttle body and air intake system adding about 30 whp and yielding 643whp/616wtq (SAE, dynojet). Needless to say, I was hoping to run a bit faster.
The Texas Mile did some changes to the runway since last March. So for my shakedown pass, I ran as-is to get a feel for my slight power increase and see/feel the changes to the runway. It was a real soft start (see video) and my family even poked fun at me....lol. For my second run, I swapped out to my shorty tires and drove the car flatout while shifting like a mad man. Well, the favorable weather combined with my new power may have done a bit more than I expected. I was pulling noticeably quicker. The red shift light was on at the 3/4 marker, and was shocked when I hit 5th gear fuel cutoff before the 1 mile marker . For my previous events, I have an arsenal of cameras, GPS devices, etc., but I had nothing for this event since I had not planned on participating . Their half-mile speed radar stopped working by Sunday afternoon, so I can't use that speed to compare/extrapolate speed with others. In short, I don't know for sure why I hit fuel cutoff but here are the likely reasons:
1) Stock clutch started to slip as I was approaching redline
2) Tires shrank
3) I actually did hit 200+, and my car slowed back down to 195 while coasting through the 1-mile line
According to my math, my car can do 202mph at 6200 with my stock gearing and a 305/30-18 tire, 25" tall). Clutch slippage is possible, but have never experienced it before, and its not slipping right now either. The tire diameter must be 24" tall in order to hit redline at 195mph (using all stock gearing). I measured the tire's diameter and circumference last night. The tire is 25.1" tall and certainly not 24". While I won't claim that I hit 200mph, rest assured I will be better prepared (Vbox, cameras, Depend underwear, etc) next March and will confirm if this stock short block heads/cam car can do 200mph on a standing mile.
Despite my limited runs, I did learn a few things that I would like to share. First of all, I will need a new top. Apparently our soft tops cannot do close to 200mph before they start to fall apart (see pic below). I had staples literally flying out. Secondly, my A/F was richer than "normal" as I was approaching 200mph. During my a/f logging for remote tuning, 2nd/3rd/4th gear pulls in Mexico show consistent 12.8-12.9 A/F ratio to redline. However, my Texas Mile runs were showing 12.4-12.5 at redline in 5th gear. All else being equal, it can be inferred that there is simply less air available. Could it be that my fancy air setup isn't ramming air into the throttle body at high speed? Or, is it simply that the Gen IV hood's air intake is a high pressure point at lower speed, but becomes static as the speed increase? Does anyone have any real academic data to support my findings?
I cannot give enough credit to Greg Good for the awesome job with these heads and Todd at A&C Performance for doing a phenomenal job of tuning remotely. I have had my tunes altered a few times for my newer mods, and Todd always comes through. You gentlemen rock
Short video:
http://youtu.be/5JuHFa-S38k
Speed slips:
Damaged soft-top after my 195mph+ pass.
Shakedown pass: 188.3mph
Flatout: 195.0 mph - hitting rev limiter before the mile marker
I had not planned on participating at this Texas Mile event. I was going to spectate on Saturday, but had some surprise family visit (for my bday ). Well, said family decided they would like to spectate the Texas Mile event on Sunday. Furthermore, they said would like to see me run. I called some contacts at the Texas Mile, and they agreed to add me to the waiting list for Sunday. So, I threw the car in trailer, family in SUV and headed to Beeville, TX on Sunday morning. As some of you may recall, I ran a 191.5 back in March (CLICK ME for thread). Since then, I have added a throttle body and air intake system adding about 30 whp and yielding 643whp/616wtq (SAE, dynojet). Needless to say, I was hoping to run a bit faster.
The Texas Mile did some changes to the runway since last March. So for my shakedown pass, I ran as-is to get a feel for my slight power increase and see/feel the changes to the runway. It was a real soft start (see video) and my family even poked fun at me....lol. For my second run, I swapped out to my shorty tires and drove the car flatout while shifting like a mad man. Well, the favorable weather combined with my new power may have done a bit more than I expected. I was pulling noticeably quicker. The red shift light was on at the 3/4 marker, and was shocked when I hit 5th gear fuel cutoff before the 1 mile marker . For my previous events, I have an arsenal of cameras, GPS devices, etc., but I had nothing for this event since I had not planned on participating . Their half-mile speed radar stopped working by Sunday afternoon, so I can't use that speed to compare/extrapolate speed with others. In short, I don't know for sure why I hit fuel cutoff but here are the likely reasons:
1) Stock clutch started to slip as I was approaching redline
2) Tires shrank
3) I actually did hit 200+, and my car slowed back down to 195 while coasting through the 1-mile line
According to my math, my car can do 202mph at 6200 with my stock gearing and a 305/30-18 tire, 25" tall). Clutch slippage is possible, but have never experienced it before, and its not slipping right now either. The tire diameter must be 24" tall in order to hit redline at 195mph (using all stock gearing). I measured the tire's diameter and circumference last night. The tire is 25.1" tall and certainly not 24". While I won't claim that I hit 200mph, rest assured I will be better prepared (Vbox, cameras, Depend underwear, etc) next March and will confirm if this stock short block heads/cam car can do 200mph on a standing mile.
Despite my limited runs, I did learn a few things that I would like to share. First of all, I will need a new top. Apparently our soft tops cannot do close to 200mph before they start to fall apart (see pic below). I had staples literally flying out. Secondly, my A/F was richer than "normal" as I was approaching 200mph. During my a/f logging for remote tuning, 2nd/3rd/4th gear pulls in Mexico show consistent 12.8-12.9 A/F ratio to redline. However, my Texas Mile runs were showing 12.4-12.5 at redline in 5th gear. All else being equal, it can be inferred that there is simply less air available. Could it be that my fancy air setup isn't ramming air into the throttle body at high speed? Or, is it simply that the Gen IV hood's air intake is a high pressure point at lower speed, but becomes static as the speed increase? Does anyone have any real academic data to support my findings?
I cannot give enough credit to Greg Good for the awesome job with these heads and Todd at A&C Performance for doing a phenomenal job of tuning remotely. I have had my tunes altered a few times for my newer mods, and Todd always comes through. You gentlemen rock
Short video:
http://youtu.be/5JuHFa-S38k
Speed slips:
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Damaged soft-top after my 195mph+ pass.
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