Liar Liar
Thread Starter
Safety Car
Joined: Apr 2002
Posts: 3,551
Likes: 0
From: No link, No dupe
Liar Liar
I'm almost at 500 miles on the new engine. To celebrate, I've been cracking the throttle open a little more (Still no full throttle, and not past 3500rpm).
Just for fun, I ran my G-Tech this morning. First, I put it on the hp setting, and set the weight to 3600. I briefly peaked 307hp according to this thing. That means 307 at the wheels, plus 20% loss, is about 368hp at the flywheel.
:bs :bs :bs :bs
I also tried the G-force feature. I got .77G off the line of acceleration. This one I might could believe, with my gearing.
This engine isn't supposed to make more than 300 at the flywheel. So, I am thinking one of two things. Either the G-Tech can't compensate for my low gearing (3.70), or it's a liar. I think it's both.
I once had the G-Tech in a new Trans-Am WS6, auto. I managed to get a 0-60mph time of 4.7 seconds. The factory rating is 5.5 seconds. I know the factory often underates performance figures, for insurance purposes, but that's nearly a second difference, with an automatic. :bs
So, what do you all think? Is my G-Tech broken; time to get a new one?
Just for fun, I ran my G-Tech this morning. First, I put it on the hp setting, and set the weight to 3600. I briefly peaked 307hp according to this thing. That means 307 at the wheels, plus 20% loss, is about 368hp at the flywheel.
:bs :bs :bs :bs
I also tried the G-force feature. I got .77G off the line of acceleration. This one I might could believe, with my gearing.
This engine isn't supposed to make more than 300 at the flywheel. So, I am thinking one of two things. Either the G-Tech can't compensate for my low gearing (3.70), or it's a liar. I think it's both.
I once had the G-Tech in a new Trans-Am WS6, auto. I managed to get a 0-60mph time of 4.7 seconds. The factory rating is 5.5 seconds. I know the factory often underates performance figures, for insurance purposes, but that's nearly a second difference, with an automatic. :bs
So, what do you all think? Is my G-Tech broken; time to get a new one?
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
Re: Liar Liar (shotgun_000)
I've done some experiments with accelerometers (both vericom and G-tech). I found them to be ok for measuring lateral G's, and 1/4 ET. I found the 1/4 mph was always high. The horsepower measurement is totally unreliable and means nothing (IMO). You can get an idea if a mod increased horsepower by doing a run in one gear only, on the same stretch of road and same conditions. This can tell you if you make more or less power. Beyong that it shouldn't be used. Also keep in mind that if you shift there will be a spike as the next gear engages (both auto and stick) and the horsepower figure will be ridicilous.
Le Mans Master
Joined: Aug 2000
Posts: 9,662
Likes: 7
From: Semper ubi, sub ubi
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: Liar Liar (shotgun_000)
I've seen pretty much the same thing as Zwede, the G-Tech is normally a little high when figuring 1/4 times. Two guys I work with recently ran their cars at the track and averaged .3 and .4 faster through the 1/4 in actuality than their G-Tech's estimated. It is a pretty good toy and if used as Markus suggested it will work give you trends to gauge your performance increases.
