Andial951

I recently used a G-tech for the first time the other day..(details posted in another thread). The G-tech gave a 1/4 mile time of 13.3@116mph. I went through my latest issue of Road & Track and in the "Road Test Summary" I was able to find1/4 times for other cars as comparison data. What I started to notice was that even though there were many cars with faster times, few cars were going as fast as mine at the end of the 1/4........so what does the speed at end of 1/4 mean? My thinking is that a slower 1/4 time but faster speed means my car started off slower than these cars but if it were a head to head race and we went to 130+ I would eventually pull......is this correct thinking? This seems to be the way most 951s work......slow at launching and then come from behind and pull on most cars.

Here are some comparison numbers:

Acura NSX - 13.4@105.9
Audi S4 - 13.8@101.7
M3 - 13.4@105.6
Corvette - 12.8@114.5
F430 - 11.7@120.1
Mustang GT - 13.9@101.4
E55 AMG - 12.8@112.4
SL500 - 14.5@98.7
EVO VIII MR - 13.3@105.9
Boxster S - 13.4@105
911 Turbo - 12.4@115.6
CGT - 11.3@131.6
WRX STI - 13.3@103

ubercooper

wow that sl500 is crap, everything else seems to be on par.

Jake951

In your case the slower 1/4 mile time reflects a slow launch off the line. If you could improve your 60' time, you'd have a much faster 1/4 mile time and maybe a slightly improved trap speed.

bleucamaro

+1 with what Jake951 said. 60ft times will tell you the most about your driving ability. With some sticky tires and a good launch you should break into the 12's. good Luck!

86 951 Driver

You should be in the high 12's at least. The high mph just indicates you had a ****ty launch. Work on getting the launch down and i will be in the 12's. Also Gtech's are notorious for giving you a higher mph then you actually had.

Andial951

my 60ft was 2.463.

spazegun2213

wait a minute there, 60 times do tell a LOT, it simply reflects how fast a car can get from a dead stop to moving at 60ft. If you look at an sti's or the s4's (the old one) 60 ft time are nuts! I have seen them with street tires to mid 1 sec runs to the 60ft line. Its a good measure of initial acceleration. My friends TT mustang's best 60ft was a 1.8 (on drag slicks), but he run almost a 10 flat at 120-130+

You can get one trend from the times and speeds. The cars that trap faster have more acceleration the faster they go. Take the NSX, my friend has one and while i can destroy him in the 1/4, anything after is fair game for him. At about 90 its over for me, and if my launch was not perfect he will pass me.

so in the end, the car traveling faster at the end of the 1/4 "should" (gears permitting) win any flat out acceleration race.

Hoss Ghoul

G-Techs do tend to show several MPH more than you'll actually see at a track, where your MPH is an average speed between two points.

Also, Car and Drivers MPH are instantaneous at the end of the 1/4 and are also not a reflection of true dragstrip MPH.

I bet that with a good launch at a track you'd probably E.T. in the 12.7-12.9 range at 113mph or so.

Andial951

so going by your statement I should be able to win a flat our acceleration race against all those cars except the F430 and CGT? Hmmmm....I would have thought I would need more rwhp for that.....well only one way to find out for sure. Im having my friend with his competition package M3 come over tonight for some flat out acceleration runs.

Hoss Ghoul

Take it to SacTown and find out what she'll do, you'll need a helmet.

Serge944

What about the vette, e55, and 911 turbo? Take it to a real dragstrip. Once you have reliable numbers, then you can start comparing.

Andial951

obviously this is all theoretical based on numbers that may or may not be accurate but nevertheless I have the numbers so why not analyse and compare. I was basing my assumption on Spazeguns's comment and so surmized that I could beat those cars including the vette and e55 because at the end of the 1/4 mile I am traveling faster than those cars......the 911 turbo would basically be a tie.

95Juan

yeah, come down to the drag strip. we can get some tacos from a local truck i know.


your 60 foot time is real important in getting a low time.


as i understand it- when you have a high time and a high speed, that usually means that you've muffed the launch and are making up time with more power.


like, an M3 traps in the low 100's, but has a ET at the same time as you. meaning he got a good launch.

951's arent known for great launching ability.

when i went to the dragstrip, i ran like, 14.5 with a 2.80s 60-foot and almost 100 mph trap speed.

for comparison, an S2000 was in the lane next to mine, he got a good launch and was a few lengths ahead, but by the 1/8th mile, i was catching him real fast, and if it had gone past the 1/4 mile, i would have walked him.


at the strip, i ran 14.5 at around 100, and for comparison, a new M3 runs low 13's at ~105.

he should by all means waste me if you're just looking at drag times.

i went out a few months later and encountered a new M3 with dealer tags. raced from ~60-140, and stayed perfectly even the entire time.


dont try to pre-stage (burnout), if you're on street tires, it wont add much, and all you're doing is wasting your drivetrain.

unless your 60-foot time is very close to 2 seconds or lower, i would take the ET (not the trap speed) with a grain of salt when thinking "what can i beat?"

spazegun2213

well, you do need to have the gearing and aerodynamics on your side. But yea, i can see you beating an AMG, and a few others (the turbo probably not though), you are lighter, and more aero than it. As long as yoru 5th will support a nice top speed you might have them

I was trying to make a point that the cars with the high speeds accelerate more on the top end. riding in a z06 is a lot like riding in a freight train, once it gets moving its acceleration is endless.

Sysgen

Hum, sounds like an S2