Dyno figures semi slick vs street tyre

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Jueshen
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Dyno figures semi slick vs street tyre

Post by Jueshen » Wed Jul 10, 2019 8:14 am

so i have been reading up never to tune or dyno with slicks and semis as they give low readings and the dyno eats the tyre
i had my car tuned with semi slicks 225's, power i put down was good, used cold pressure at 1.7 bar
2.5 hours of tuning with breaks in between, tyres did get grippy R888R but saw no damage
so my question is:
is my car tuned right? would i have lost alot of power
went back the next day for a power run with cold semis no significant drop increase in power..
Ex:
2007 Polo GTI
Eurodyne! 230WHP & 390NM @ KAR 2016 - without OB
2013 Honda Ballade Elegance
1996 Honda Ballade 150i
1994 Honda Ballade 150 Luxline
1991 Citi Golf 1.3
2009 Citi Rox 1.4i
2007 Polo 1.6 Comfortline
1989 Citi Sport 1.8
Stu
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Re: Dyno figures semi slick vs street tyre

Post by Stu » Wed Jul 10, 2019 8:59 am

I really dont think tyres make much of a difference on a dyno, only noticable on the road in my opinion
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DotDubb
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Re: Dyno figures semi slick vs street tyre

Post by DotDubb » Wed Jul 10, 2019 9:03 am

I do think that if you have a higher profile slick/semi compared to a street tyre, then it will change the figure. It also plays a role with your gearbox ratio and the exit speed if you do quarter mile racing.

But slicks have a very softer compound, so a dyno will reduce it's tyre life.
'07 Velociti 2.1 1.6v 133wkw 210nm -Bloody Mary
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Jueshen
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Re: Dyno figures semi slick vs street tyre

Post by Jueshen » Wed Jul 10, 2019 9:08 am

only thing i noticed that the bumps (vent spews) on the tyre where rollers made contact have worn down to the actual tyre, (not the thread wear indicator) so far im happy just wanted other opinions.. i have seen what some slicks look like when damaged on dynos but i think since i was on semi's it helped, no damage or overheating at all
Ex:
2007 Polo GTI
Eurodyne! 230WHP & 390NM @ KAR 2016 - without OB
2013 Honda Ballade Elegance
1996 Honda Ballade 150i
1994 Honda Ballade 150 Luxline
1991 Citi Golf 1.3
2009 Citi Rox 1.4i
2007 Polo 1.6 Comfortline
1989 Citi Sport 1.8
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