1/4 Mile Times With G-tech And Others

[Power]

Interesting sideline to the HEAPS of coverage of the new Porsche 911 Turbo S.

They, Motor Magazine, pulled off an 11.998 @ 186.29km/h (around 117mph) at WSID! - Stock car - but at $350,000 - ouch!

One of the sidebars was this:

VBOX v DRAG STRIP TIMES

Ever beaten MOTOR's performance times? This is why?

For six months our new VBox has been pumping out performance numbers, but this was the first time we'd tested it against the beams of a measured track. So why, we were wondering, did VBox spit out numbers around 0.4 seconds slower than the tracks timers? Blame roll-out.

At drag meetings, two staging beams - those two white lights on top of the starting tree - mark the start line. The timer starts when the car moves and uncovers the second beam, a distance close to 30cm - what is called roll-out. A hard launching car like the 911 Turbo S is already travelling at 7km/h by this distance which translates to a time that's interesting but inaccurate against magazine figures. So whilse MOTOR's figures are accurate and repeatable, times recorded at drag strips will always be quicker than our times recorded by the sat-nav based VBox, by around 0.2-0.4 seconds.

I guess this means a good G-Tech (different technology but same end result) time, should therefore - all other issues aside - translate into an even better strip time?

[jEtONiT]

I read that a couple of days ago in the mag.. I think what theyre trying to say is their "vbox" is more accurate than the drag strip times..

[ZAP]

I agree with jetmir, the vBox would be more accurate as it is measuring the car movement from a dead stop.

At the strip you can shallow stage and by the time the WSID beam starts to measure you, the car is already moving (7km/h from memory in the porsche).

In regards to the G-Tech, it would be the same as the VBox, but would be affected by the pitching angle of the car giving inaccurate readings.

From my understanding the VBox is like a g-Tech with GPS, only more accurate and with more options.

[turbotom]

For what it's worth (I paid $89 on ebay) the G-tech is bloody fantastic.

Prior to going to the drag strip, I used the G'tech to do some practice launches and get an idea of consistency of times....

was getting consistent 13.0~13.1 at around 118~119 mph. This is on various private bitumen tracks

Anyway, at AIR (Virginia, S.A.) I pulled a 12.8 @ 116.92 and a 13.01 @ 117.27.

Got to be happy with the resolution, accuracy and consistency of the G-Tech.

Now I have a way of assessing further mods before heading to the strip.....

Got to get down to lo 12's on street rubber...

Need More Power .....

[blueboost]

For what it's worth (I paid $89 on ebay) the G-tech is bloody fantastic.

Prior to going to the drag strip, I used the G'tech to do some practice launches and get an idea of consistency of times....

was getting consistent 13.0~13.1 at around 118~119 mph.  This is on various private bitumen tracks 

Anyway, at AIR (Virginia, S.A.) I pulled a 12.8 @ 116.92  and a 13.01 @ 117.27.

Got to be happy with the resolution, accuracy and consistency of the G-Tech.

Now I have a way of assessing further mods before heading to the strip.....

Got to get down to lo 12's on street rubber...

Need More Power .....

<{POST_SNAPBACK}>

Yes they can be right , but is only right if the road is level, and the gtech is level, so bad setup will give wrong results, and with the new ones, the rollout has to be set around 0- 2inch rollout for a streetcar ( that is what I have found) and the mph has shown high between( 1-3 mph)

[jordak]

For what it's worth (I paid $89 on ebay) the G-tech is bloody fantastic.

Prior to going to the drag strip, I used the G'tech to do some practice launches and get an idea of consistency of times....

was getting consistent 13.0~13.1 at around 118~119 mph.  This is on various private bitumen tracks 

Anyway, at AIR (Virginia, S.A.) I pulled a 12.8 @ 116.92  and a 13.01 @ 117.27.

Got to be happy with the resolution, accuracy and consistency of the G-Tech.

Now I have a way of assessing further mods before heading to the strip.....

Got to get down to lo 12's on street rubber...

Need More Power .....

<{POST_SNAPBACK}>

Just from interest what is your GTech showing for 0-100 with those 400 times?

[Ezy10z]

I read the same article and they also said the dragstrip is the accurate one and they way should be measured. Plus 0.4 doesnt mean it's 0.4 for every vehicle, eg. if rex does 14.2 in the mag doesnt mean it does 14.6 at a drag strip and the same goes for a any other car. It all comes down to the fact on the weather, the hp variation, traction, driver skill, and weight of car. Motor suggested the strip is the true measure of 1/4 mile times.

Robbie.

[Ezy10z]

I guess this means a good G-Tech (different technology but same end result) time, should therefore - all other issues aside - translate into an even better strip time?

<{POST_SNAPBACK}>

I'd say the accuracy is determined by how level the road is. I tested the REX with a G-Tech a week before I raced it at Calder and with the G-Tech I did 13.42@104mph and did 13.45@101mph at Calder but I wasnt launching as good at Calder because of the grippy track and it was a warmer day but on the road where I was testing the G-Tech it was launching much harder.

Robbie.

[turbotom]

For what it's worth (I paid $89 on ebay) the G-tech is bloody fantastic.

Prior to going to the drag strip, I used the G'tech to do some practice launches and get an idea of consistency of times....

was getting consistent 13.0~13.1 at around 118~119 mph.  This is on various private bitumen tracks 

Anyway, at AIR (Virginia, S.A.) I pulled a 12.8 @ 116.92  and a 13.01 @ 117.27.

Got to be happy with the resolution, accuracy and consistency of the G-Tech.

Now I have a way of assessing further mods before heading to the strip.....

Got to get down to lo 12's on street rubber...

Need More Power .....

Just from interest what is your GTech showing for 0-100 with those 400 times?

Not as good as I'd like.... high 5's from memory

Got to get this lard arsed ute launching better if I want to crack 11's

[blueboost]

I read that a couple of days ago in the mag..  I think what theyre trying to say is their "vbox" is more accurate than the drag strip times..

<{POST_SNAPBACK}>

I am not sure if the vbox is as accurate as they think, even the best gps's that we use at work, are still inconsitent ( to about a metre) so these can be out more than three times the distance of the drag strip (30cm) if you want to get the real time at the drags, just stage deep, and the time on the gtech should be the same. but the mph will still be a bit different because the drag strip measures between the time it takes to go between two beams at the end of the track.

David