Looking to do a ton of different combinations of intake,carb, timing, header swaps over the winter on my car, and am looking for a way to truely "see" any progress in performance in the car.
Would something like this give me HONEST 0-60 or say 0-100 or 1/8th or 1/4 mile times ?

http://www.race-technology.com/WebPa.../AP22Home.html


Also theres a company called G-Tech that makes some neat setups like this.

http://www.gtechpro.com/

Think its a gimmick, or legit ? I'm skeptical so far.
They do offer a 30 money back offer on the G tech models

 

Its not a gimmick accelerometers are real. Thats how they work. The more accelerometers that are used the more accurate and the better they are.

 

Yeah, but how in the h*ll can something stuck to the windsheild, and NOT hooked to the enigne in any way, produce accurate HP & torque figures ????

 

its an acceleromter. it works on the exact same principle as a dyno. how do you think they tell speed in air craft ? i mean before gps. the big trick is to input the correct and accurat weight with driver exactly as tested. the g-tech has a setup feture to were you record your engins rpm that the unit picks up. you basicly have to calibrate the unit to your vehicles rpm by holding the car at a low rpm and syncroniseing the unit. you do the same for a high rpm setting. it will say for instance 2400rpm, and you hold your car at 2400rpm. you would do the same for say 4000rpm. then it can pick up the tach signal. then it takes the messuments of the weight of the car , time it takes to cover a distance useing the accelerometer. it also does 0-60, lateral accelation and many other functions. there really cool as long as you get the newest version. they retail for about $269 when i used to sell them about a year ago. its kind of hard to explain it in writing for me , if you were standing in front of me i could give you the facts quickly.

 

Even the best accellerometer is only as accurate as the variable data that you put in it. Don't think you can look up what your car is supposed to weigh in some book and get accurate information. ALL information required has to be completely accurate, and they work very well.

 

I have (well had, someone stole it outta my truck last week...) a g-tech pro, one of the older models that go for like $40-50 nowadays. Givin a nice flat road its pretty accurate. Even if its not exactly accurate its still a good tuning tool because its consistent with its results. If your car improves, it'll show an improvement (even if its wrong)

 

I have a vector 2 and its pretty accurate and fun to play with. Even if its not the same as the actual track its accurate every time so if your .05 slower at the track the meter will be consistantly of by .05 so you can gain knowledge on launch techniques or performance gains based on your intial test runs. the hp and torque # are more or less a fun bonus. If you spin of the line a little your hp # go way down if you gety a great launch there up.

 

I use mine for 0-60 and 1/4 mile (ET only in the 1/4 mile- the MPH numbers seem to be optimistic). The HP and Torque readings don't seem to have much relevance except to themselves so I don't use that function.

It is fairly consistent, so it's good for making changes over time and comparing results, but don't expect the readings to compare exactly to other ways of measuring performance (dyno, dragstrip timing).