G-Tech

[F350Lawman]

I got a G-Tech Pro RR for Christmas and tried it out today. Walking it out slowly, I got the following during a impromptu 1/4 mile run. I think the times are pretty close based upon my cars mods and what I think the car should do. As far as TQ and HP they are based on my guess of 3100 lbs with 3/4 tank of fuel and me as a 150lbs. passenger and the3 G-Tech figuring the rest. From what I have read all the guys who weigh my model/year with a/c all stock goodies installed get around 2900-2950 without a passenger. The only thing I have lightened is the smog and stock exhaust but I had some junk in the car so it should equal out. Basically I just started from the shoulder of the road (complete with rumble strip) and slowly rolled it out onto the right lane and then slammed it to the floor. As you can see by the difference in top speed and speed at the end of the run...I actually eased off slightly (not enough to stop clock) at the 12.45 second mark where my speed peaked at 110.7, don't ask me why but I had guessed by eye where 1/4 mile ended and was just slightly off. I think I can easily go sub 5 second 0-60 and sub 13 sec. 1/4 mile...IF I stress the clutch a lil'(which I won't do) and don't let off early. I really babied the car out of the hole, basically your average "pull out into traffic" throttle, so I was pretty happy with the results. I figure I might have sqeaked out 115 mph at the end if I held it to the floor for another second. Several cautious 0-60 runs were right at the same numbers with real SLOW 60 FT times. 60 FT 2.769 0-60 5.639 secs 330 FT 6.367 1/8 mile 9.174 89.05 MPH 1000 FT 11.548 1/4 mile 13.558 @107.63 Top speed during run 110.7mph HP Net 309.1 @ 5695 rpm ( seems to be about 200 rpm lower than my tach says so it is more likely 5900) TQ Net 313.6 @ 4866 ( again more like 5066 by the tach)

[NathanUK]

I just compared the times to mine from Santa Pod, looks about right if you took it easy on the start. My car was light, with a G50 5speed but with a stock engine. 13.1 @108mph. I couldn't get it any quicker with 3 attempts.

[mark '87 930]

F350Lawman,
we pretty much have the same car, except I don't have a K27 on mine yet. I got the same readins as you, except the 0-60 time. I can't measure that because the car just doesn't launch well from start. My clutch is always slipping when I try to launch remotely harder than usual. I'm surprised that you are not getting higher numbers with that K27 though. I get 310 with the stock 3LDZ. My car weighs in at 3175 with me in it and 3/4 a tank of gas.

[F350Lawman]

I'm surprised that you are not getting higher numbers with that K27 though.


I think I will, I was really not under the best conditions and have never tried it before. I need a dead level road and the ability to start in the lane I am finishing in. Rolling on from off the side off the road can't be optimal (as my 2.7 second 60" time suggests)

For the HP #'s they don't suggest you take them from 1/4 mile run but rather, they sugggest slowly rolling through 1st gear and shifting into 2nd and dropping the hammer when you get 1/2 way to redline. So a nice normal start with a shift to 2nd at about 3400 should give higher numbers.


Even so just supposing the 309 is the best I ever do. 309 HP is net, and that is even lower than you would get on a dyno because of the wind resistance and rolling resistance of an actual run. If it were on a dyno most people add 15% to the 309 which equates to about 355 gross HP. Maybe I'm losing 18% this way and that would equal 365 gross HP. That seems about right to me. Guy who sold me the car said when the top of the engine was rebuilt 12,000 miles ago and the goodies were added it was guesstimated at 390. So who knows maybe 365-375 is more like it.

All I know is it is fast enough to SCARE out on the highway and through the turns. The only real comparison ( that I have driven regularly) I have HP wise is my co-workers 911 C2S Tip (282 HP gross) and they are noticeably different animals. The C2S has great top end but has much less grunt and wow factor. However his car is easier to drive fast in the twisties and you can hold the cell phone in one hand and still haul a$$. Very annoying when we are driving pretty hard and he is calling me on the phone as I try to shift, brake, steer. etc.

[canada911]

Very Impressive!
I love the G-Tech Pro I purchased 2 years ago.
My somewhat modified 3.4 1970 911.
The car is quite light at 2400 lbs with driver.
60' = 2.134
1/8 mi = 8.37 @ 92.11
1000 ft = 10.687s
1/4 mi = 12.567 @ 121.58 mph

I later changed to a smaller diameter reat tire and the mph was reduced to 119 because of the extra shift required.

[NathanUK]

My timed figures at Santa Pod Raceway UK.

60' .......... 2.135
330' ........ 5.608
1/8 ......... 8.802 @ 84.40mph
1000' ...... 10.937
1/4 ......... 13.12 @ 107.41mph

Car weighed 1220KG with no driver and very little fuel. Had half a tank when timed.

[afterburn 549]

Its all impressive to you try a real; 1/4, then be prepared to cry...I have found them to be as accurate as a sundial on a cloudy day

[RarlyL8]

I "calibrated" my G-Tech at a dragstrip. Found that the wieght needs to be exact to get similar results.
Mine in the 1/8th mile:
8.5sec @ 90mph

[NathanUK]

My figures above were the times from the slips at the drag strip.

[Emission]

Originally posted by afterburn 549
Its all impressive to you try a real; 1/4, then be prepared to cry...I have found them to be as accurate as a sundial on a cloudy day

I'm no expert, but I hear the dragstrip doesn't start timing until you roll a bit. The G-Timer/GTEC start when immediately.

In any case, you can calibrate it to be nearly dead even with a strip if you take the time.

[afterburn 549]

If I am going to the strip, why woud I need a G meter ??

[RarlyL8]

I stated above I calibrated my G-Tech at a drag strip. Once you do that you can make changes to your car and don't have to go back to the strip. It is worth doing.
Also - the drag strip starts timing as soon as the start beam is broken. You need to stage with zero roll out to get the most accurate readings from the G-tech.