I just purchased a g-tech pro accelerometer - has anyone on the list experimented with these? What sort of "real" 0-60, 1/4 times are folks getting on their cars? <p> I know that cars usually get a bit quicker as they get broken in, before they start to wear and slow down - how does the A4 hold up with its various engines?<p>How about mods? My car is a bone stock '96 2.8 QM, so I'll be able to comment on various things as I try to improve the zip (filter, throttle body, maybe more). However, there are lots of other mods for the 30V and the 1.8T, and I'd be very interested to see real-world results of the various chipping, filters, turbo kits, superchargers, and anything else people can dream up.<p>Also of interest would be if anyone has used one of these things to check out what kind of performance gains they get with lateral acceleration on various combinations of tire/wheels, suspension mods, etc. over stock (or sport).<p>What a great new toy, if it works....

 

Check archives. I think this has been discussed at length.

 

Of course.... My bad, lazy bones. Apologies.

 

I have one, and I would say it is worth it as we have Quattro and this is the only way we can measure hp unless you know a facility that has 4 wheel dyno capability and spend the $$ for every new add on performance product you measure.<p>One comment from an earlier posting which made a lot of sense was if you would like to measure 0-60, 60-0, 1/4 mile, it pays to have stiff suspension to get better accuracy. With stock, soft suspension, the car will sit (rear suspension compressed) making the GTech register massive positive G-Force, and as it comes up to equilibrium somewhere while accelerating, the GTech will measure negative G-Force which can affect the 0-60 times by almost 0.5 sec according to some postings. My suspension is lowered, so accuracy is better, but regardless, GTech does not take into account a lot of factors so it will never be as accurate as a fifth wheel kinda gadget but for a Gtech at $140, it is well worth it.<p>At least you can measure a baseline performance and work you way up there. Tips in doing so, temperature is really important. I try to measure my runs with temperature of 65-68 as that was the first time I did it. At 85F, my measurements will be longer as the hp will drop. Also, keep the measurements at identical places so that altitude and gradient do not become a factor each time. I have a favorite portion of the Freeway that I do 0-60 runs as it is completely safe because I only hit 60 mph anyway.<p>I won't have the guts to do a horsepower measurement yet, as you would have to go redline on a high gear - particularly 4th, and that would be over 120 mph. I'll leave that to a 4 wheel dyno.<p>So, what did I get?<p>0-60 7.4 seconds without E-RAM @ 70F (care of built in external thermometer)<br> 8.5 seconds with stock air box, stock filter and Remus muffler. Also at 80F. This will be repeated again. I only did this run twice for curiosity. Unfortuntately it's pretty warm lately.<br> 6.8 seconds with dual ERAM superchargers @ 65F - or max mods to my car. Includes ram air duct, cone K&N filter, remus muffler which glass pack for resonator.<p>BTW, 1996 December issue of European Car, they used a Gtech to measure a 96 A4Q before and after mod of a throttle body and K&N filter. Before (stock) was 7.35sec 0-60. After TB and K&N panel, they managed 7.15sec. Not bad IMO. Too bad they did not continue the project with cat back upgrade and cams as that is the max aftermarket bolt on we have for our cars.<p>Then again, there is Vortrag, so keep an eye on them. They are developing serious mods for our 12V.<br>

 

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Curious. Do you remove the rear propeller shaft and multiply the data by 2 (due to 50/50 torsen split) or some other manipulation?

 

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