ET Calculation
Le Mans Master
Joined: Jan 2002
Posts: 5,556
Likes: 0
From: Jenison MI
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
FAST....
I would say some where between 12.931 @110.65mph
and 12.080 @ 112.84 mph .. That's figuring on a 3300 lbs (car + driver) weight and 370hp.
Check for your self
ET = (weight/hp)0.2841 x 6.9446 (The LRT Formula) 12.931 @110.65mph
ET = (weight/hp)1/3 x 6.269 (Geoffrey Fox's Formula) 13.001 @110.91mph
Then there is one more, the Patrick Hale's Formula.
That one gives you 12.080 @ 112.84 mph
Now looking back to what my car ran stock I would go with the Patrick Hales Formula. That one seems to come out closer to what it should be.
I would say some where between 12.931 @110.65mph
and 12.080 @ 112.84 mph .. That's figuring on a 3300 lbs (car + driver) weight and 370hp.
Check for your self
ET = (weight/hp)0.2841 x 6.9446 (The LRT Formula) 12.931 @110.65mph
ET = (weight/hp)1/3 x 6.269 (Geoffrey Fox's Formula) 13.001 @110.91mph
Then there is one more, the Patrick Hale's Formula.
That one gives you 12.080 @ 112.84 mph
Now looking back to what my car ran stock I would go with the Patrick Hales Formula. That one seems to come out closer to what it should be.
Last edited by fsr402; Jun 2, 2005 at 11:23 PM.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
That is 8hp more then I have. I have done 115.xx and 11.96 et. Now you did not say if it was a automatic, and if you have a stall converter. If so, and weather is good, etc. My guess would be mid to high 11's and 115-118 mph. But all of us are guessing. Find a track and go find out.
Burning Brakes
Joined: Nov 2003
Posts: 914
Likes: 1
From: Redding Ca
Need to know a couple more bits of info:
1. Stall or launch rpm
2. RPM at max HP (this one is a biggee because it sets the torque curve)
3. If stick, need each gear ratio
4. Cubic inches
5. Shift rpm
Then I can plug these into Qtr Jr. Very accurate program Terminal mile per hour is a good indicator of HP. ET is not due to varying slipperyness of the track and suspension. The above posted estimates are pretty good. Should be mid-low 12's at around 110 depending on 1-5
Incidentally the Qtr Jr program sells for $95,
www.QUARTERjr.com. One of your best hi-perf investments. Puts many myth's to rest and eliminates shade tree guesswork
I used it over and over on my 505 BBC altered roadster, injected alcohal and it was dead on once I got the input parameters right (many of us think we make more power than we really do). It is great for decision making on future mods, gears, converters, weight, whether to raise or lower peak HP/torque etc. 
1. Stall or launch rpm
2. RPM at max HP (this one is a biggee because it sets the torque curve)
3. If stick, need each gear ratio
4. Cubic inches
5. Shift rpm
Then I can plug these into Qtr Jr. Very accurate program Terminal mile per hour is a good indicator of HP. ET is not due to varying slipperyness of the track and suspension. The above posted estimates are pretty good. Should be mid-low 12's at around 110 depending on 1-5
Incidentally the Qtr Jr program sells for $95,
www.QUARTERjr.com. One of your best hi-perf investments. Puts many myth's to rest and eliminates shade tree guesswork
I used it over and over on my 505 BBC altered roadster, injected alcohal and it was dead on once I got the input parameters right (many of us think we make more power than we really do). It is great for decision making on future mods, gears, converters, weight, whether to raise or lower peak HP/torque etc.
Last edited by GeosFun; Jun 3, 2005 at 11:04 AM.
Le Mans Master
Joined: Jan 2002
Posts: 5,556
Likes: 0
From: Jenison MI
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Originally Posted by VAHROOM
Go to Car Math and give it a shot.
You will run High 11's - low 12's (if you can drive)
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Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
Originally Posted by 91superram
What would be my approx. 1/4 mile Et with 370rwhp and 380rwTq with a 3:54 gear and a sticky tire in a C4
with you driving? well i just read your other post and u ran a 12.5.
u should be doing better then that.................