I know there not all that accurate but I did 2 runs with a gtech, 1st run was 17.3 with peak hp at 88hp, and the 3rd was a 16.9 launching really hard at 90 peak hp. death to the LO3!

 

I think your engine is in desperate need of a tune up, or swap into a junk yard.

 

The hp reading depends both on the run, the engine condition AND on what you enter for vehicle weight. It's not that accurate. The ET & trap speed measurements on a GTech are more accurate than the GTech hp estimate.

LO3 was 170 fwhp from the factory and they measure approx 140-145 rwhp on a chassis dyno if the engine is in good condition and is well tuned. You should run an ET in the mid 16s bone stock and in the low 80s for mph trap speed. 16.9 is probably a few tenths off of where it could be, in good condition, with a good launch, in cool weather.

Other, perhaps smarter, owners here have gone into the 15 and some into the 14s with little modification with the same engine. YMMV.

 

The HP calculator for the G-tech and the G-tech pro are both off by a pretty large margin, more so with the original G-tech. Don't take the G-tech numbers as the gossible, use it as a tuning tool. It doesn't matter if it says your doing 30 second 1/4 miles, as long as it's repeatable. This will give you a yard stick to measure your driving technique and modifications by.... you just won't know exactly how long the yard stick is.

I ran consistant 14.5's with the g-tech and my buddies mustang ran consistant 14.1's. We went to the track and I ran 13.8's and he ran 14.5's.....figure that one out. It had a LOT to do with how the cars launched.

 

Yes, there is a video of my car with a G-Tech, it went 14.1 on the g-tech, i went 13.3 at the track.

 

I had a '88 Trans Am 305TBI, 160K on it with bad lifter noise. It ran a 17.3 at the track with like a 2.4 or so 60'. Your car should do better then mine did. -Nick.

 

FWIW, if you run the GTech on the street, and then later run at the track, you have two different runs, with two different launches, in possibly two different weather conditions, on two different surfaces. IF you are skilled at launching, and the surfaces/weather are cooperative, then the GTech ET will usually be close to the track time. OTOH if any of the above is different, then you can see different results. In some sense you need to make (say) 5 runs on the GTech and compare it to the best run at the track.

The very best way to sanity check whether the GTech is at all accurate is to run the GTech in the car during the same track runs. There are web sites that have documented track vs GTech (or equivalent), and Car & Driver did a full story on personal accelerometers (incl GTech) sometime last year. IIRC both the web sites and the C&D article showed the same things:

* the personal accelerometers (like GTech) are absolutely useful as a tuning tool, to see relative changes after a modification has been done.

* the GTech ET is generally within 0.2 sec of the track data (for the same run) for cars that run in the 13 to 17 sec bracket at the track.

* the trap speed on the GTech tends to overestimate what the track trap speed is, because the GTech isn't averaging over the last 50 feet, whereas at the track you trip not only the finish line sensor, but one or more sensors set to measure the avg speed through the finish line. The amount of mph error depends on whether the car runs in the 17s, or in the 13s.

 

lol thats funny. 90 hp!!! i didn't read all the other posts but that thing has to be way off.

 

all i know is i raced a 2000 maxima and i got my butt handed to me!

 

If it was a 3.5SE model then you have nothing to worry about, those run mid 14's strait from the factory. A 350 Iroc would have a hard time keeping up with one of those.

 

My 88 305 TBI ran 17s. I like to refer to my engine as a Low Output 305.
I think I ran one 16.9.
The rest were between 17.2 and 17.6.
I had no mods.
I had about 10 runs over 3 days. I never won and I never saw anyone run a slower time.

 

Dont feel bad, they are kinda quick... Im sure someone here knows what they run, Im guessing mid 14s.

 

naw those new maximas got power but there not a 14 second car, i believe there high 15's - low 16's.

 

My bad they actually run mid 15's with a 0-60 in 7 seconds. Check it out here MaxFAQ: Maxima History


Either way thats a good second faster than your car is right now, which equates to almost 10 car lengths over a 1/4 mile.

 

i ran a 16.1 with my lo3 on a g-tech all my engine has is tbi mods, it was about *55 at the time