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 Post subject: drive shaft rpm graph
 Post Posted: Tue Apr 28, 2009 6:05 pm 
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Ok here is also the graph from the 1st round last week and tell me if this looks normal???? I don't think it's spinning the tire as there is no spike in the RPM..Right???

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 Post Posted: Tue Apr 28, 2009 6:26 pm 
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If thats driveshaft RPM then its probably spinning the tyre. Our car does exactly the same sort of graph and it turns the tyre 1.5 times off the line in a distance of about 4'. The graph looks the same.


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 Post Posted: Tue Apr 28, 2009 6:38 pm 
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So why does it not show a engine rpm spike??? And this is normal???

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 Post Posted: Tue Apr 28, 2009 7:12 pm 
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Beretta wrote:
So why does it not show a engine rpm spike??? And this is normal???

Cause the engine is on the converter and the tire doesn't spin enough to allow the engine to go higher than stall speed.

I've seen oscillations sometimes that I "thought" were sidewall winding up then unwinding, but I don't think that is the case with your car. I think that yours is the initial spin of the tire as shrinker mentions.

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 Post Posted: Tue Apr 28, 2009 8:09 pm 
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So this is what is called controlled spin??????

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 Post Posted: Tue Apr 28, 2009 8:14 pm 
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rick360 wrote:
I think that yours is the initial spin of the tire as shrinker mentions.

Rick


X2, I've seen the same thing on mine.

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 Post Posted: Tue Apr 28, 2009 8:20 pm 
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Thanks guys =; =;

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 Post Posted: Tue Apr 28, 2009 10:17 pm 
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One other thing Barry. Next time you see one of those, look at the MSD graph to see what it shows. I've seen stuff on mine that didn't show up on my logger.

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 Post Posted: Mon May 11, 2009 8:48 pm 
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Beretta wrote:
Ok here is also the graph from the 1st round last week and tell me if this looks normal???? I don't think it's spinning the tire as there is no spike in the RPM..Right???

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here's the graph with the new IC.......
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 Post Posted: Tue May 12, 2009 3:56 am 
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well thats showing less spin but it still broke it loose eventually because the torque is just too much. So what was the change to the IC?
There is also a difference in engine RPM at the point of recovery. So why?
And a difference in the driveshaft rpm after a period of approx 2 vertical time segments. So whats going on? There is no comparison of data here. If the car was indeed that much quicker on one run compared to the other then the ET would be vastly faster.


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 Post Posted: Tue May 12, 2009 4:53 am 
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The IC is out from 55 to 65......Again the track was not great others were also complaining :-k

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 Post Posted: Tue May 12, 2009 5:17 pm 
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If the IC is in a location that allows constant compression of the rear shocks then there is no advantage to rear weight addition. The car will be stable etc but not high traction. The longer IC slows down the initial snap and stops over compression of the tyre and tyre bounce. You have a few things going on that are helping you in one aspect and hindering in another. If the torque converter is capable of overpowering the tyre then you need to employ short IC's but it appears yours is not. For the track to be the cause of the difference in driveshaft RPM and you not to exceed traction then the torque converter is falling over quick enough to not cause traction problems.


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