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post #1 of 12 (permalink) Old 08-25-2005, 12:10 AM Thread Starter
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Max acceleration G-forces

My new stereo has some built in performance meters, was playing with it at lunch today and the best acceleration G-force I can get is 0.62

Damn I need to get that number higher. Need to start measuring cornering force also now that I have the new sticky tires.
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post #2 of 12 (permalink) Old 08-25-2005, 01:05 AM
 
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.62 accelerating which way? What does it read when you slam on the brakes?
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post #3 of 12 (permalink) Old 08-25-2005, 01:58 AM
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Lower it, and get sticky tires.
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post #4 of 12 (permalink) Old 08-25-2005, 07:10 AM Thread Starter
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It reads negative when I slam on the brakes, .62 is pure straight line acceleration on a flat road

As for stickier tires I don't see too many that are better then the GY Eagle F1 GS-D3's that I have on there now
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post #5 of 12 (permalink) Old 08-25-2005, 08:46 AM
 
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That is darn near impossible to get a .62g acceleration reading on a front wheel drive car with only that little power. Is it calibrated to compensate for the tilt the car experiences when you take off? The best reading I ever got in my old Turbocharged Eclipse was in the high .30's and my b-i-l's 300ZX could only manage very low .40's in acceleration. The average for the Eclipse was in the .35's before the tires would break loose. Your reading would indicate that your Trep is accelerating at twice the rate of the Turbo Eclipse. I would believe it if you said you were in the .40's since the Trep is heavier (for more traction) and more torque, but I find it very hard to believe your Trep could achieve a .62 reading.

The closest certified tests that I can think of to compare your #'s to would be in the Sept issue of Road and Track where they tested a bunch of supercars in a flat-out 1 mile acceleration test. Here are a few results for the average g force in the first 100 ft. I doubt that these cars will lose hardly any acceleration force in the first 100 ft.

Vortech Mustang GT: 0.56
Chevrolet Corvette: 0.59
Lambo Murcielago: 0.61
Dodge Viper SRT-10: 0.63
Ford GT: 0.68

You get the idea. So based on my real world experience and that article, I find it really hard to believe that your stereo's g-meter is reading true.

Do me a favor and go drive in a semi-large circle in an empty parking lot and tell me what you get for lateral g's (average).
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post #6 of 12 (permalink) Old 08-25-2005, 10:48 AM Thread Starter
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thank you, finally someone caught on to the fact that I wasn't serious and there is no possible way I could hit that G-force unless I was rear-ended by an Amtrak!
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post #7 of 12 (permalink) Old 08-25-2005, 11:11 AM
 
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I would go out with my Tazzo and see what forces it reads, but I don't trust that thing any more.

I was going to ask you what stereo has built in performance meters.
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post #8 of 12 (permalink) Old 08-25-2005, 11:58 AM
 
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kenwood kdc-x889 does and its not that accurate i picked it up for 300 bucks and its quite a bit different then my g teck pro rr
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post #9 of 12 (permalink) Old 08-25-2005, 01:01 PM Thread Starter
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Actually, my stereo does have the G-force meter built in but to be honest I haven't even done the calibration steps because it's justa gimmick to me and not one of the reasons I bought the stereo

It also has a little car display that turns on the road to mimmick your actual driving

I have a Kenwood KDC-MP828 head unit
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post #10 of 12 (permalink) Old 08-26-2005, 01:15 AM
 
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Quote:
Originally Posted by JoeKD
Actually, my stereo does have the G-force meter built in but to be honest I haven't even done the calibration steps because it's justa gimmick to me and not one of the reasons I bought the stereo

It also has a little car display that turns on the road to mimmick your actual driving

I have a Kenwood KDC-MP828 head unit
As long as someone doesn't think that it's a true performance meter, then that would be pretty cool though. There are some really stupid features on head units, at least this one has some kind of function to it.
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post #11 of 12 (permalink) Old 09-12-2005, 11:40 AM
 
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the belltronics g-meter works well for this stuff.
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post #12 of 12 (permalink) Old 09-13-2005, 09:26 PM
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The numbers are all weird, I suspect the industry has no standard for measureing forward gs.

At maxima.org, they show the 5th gen, VQ35 Maximas peaking at around .75g in 1st gear, and the VQ30s peaking at around .67g:

Manual shift points


Ultima GTR is also claimed to have peaked over 1.0 g during 1st gear launches, and achieved 1.176g on the skidpad:

PDF Ultima record data log

the data sheet show a max acceleration of 11.082m/s^2. 9.81 m/s^2 is 1 g, so 11.082 would be around 1.13g.

How R&T gets .79g for a lola champ car I don't know. Perhaps the average really lowers the number?

So overall, if a 3.0 maxima does .67, a 3.5 maxima does .75, then a 3.5 Intrepid could be able to peak at 0.62g in 1st gear at torque peak.

Put the car in first, hold about 25 mph or so, and then punch it. It does feel like .6 gs or so.
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