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  #1  
Old 14th July 2002
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niko niko is offline
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Yesterday night, I was on speedway with a friend of mine with his GPS computer. His computer can provide informations like position in the 3-axis and naturally the real speed as the system know our displacement every meter and every second.

Finally, here are the results:

Vmax was 227kph and i was reading 240kph.At this speed the pressure was 0.7bar.
When i was reading 130kph, he tell me 123kph.

With this two points, i can suppose that the speedmeter error is around 5.8%.

My tyre setup is: 195/65 15"

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  #2  
Old 14th July 2002
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Sorry , my tyre setup is 195/60 15"...
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  #3  
Old 14th July 2002
Keith Keith is offline
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A genuine 140mph, pretty good! :wink:
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Old 15th July 2002
Johann F Johann F is offline
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I would treat standard GPS readings with caution - I have compared them to surveyed information and data from the very accurate DGPS and they can be way, way off - even though the unit is estimating a small error.
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Old 15th July 2002
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Yes, there is probably a little error. But I was reading 240kph on the speedo. So I'm sure that the speed was between 220 and 240kph.
Morever, I remember that one day I was racing with an Impreza and we were equal at top speed. The top speed of an impreza is 228kph.

I'm quite please this result. I just have to find why I can't hold more than 0.7bar at high rpm.

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  #6  
Old 16th July 2002
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Doesn`t the APC reduce the boost pressure at anything over 4000 RPM? Unless you have done away with this?

I had an indicated 145MPH out of my T16S, but my gearbox went bang and i now have an injection box in and this morning it was doing 130MPH at around 5600RPM. Still its not really that useful to have a high top speed is it? Now the acceleration is improved (I think!) and it sits at 60MPH at around 27-2800RPM so hardly any lag when overtaking.
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  #7  
Old 18th July 2002
aeroman aeroman is offline
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Hi, NIKO , I saw that you live in Paris, are you french? I 'm kind of saab cars and i think i could help many people in this forum but I don't speak very well english. too bad!!
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  #8  
Old 18th July 2002
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Yes. I'm french. Send me an e-mail at thomas.niko@wanadoo.fr

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