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Old 11 Oct 2004, 05:50 am
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Default Aspect Ratio

What is the aspect ratio on the PT GT? I'm assuming this is the gear ratio?

I would like to know the aspect ratio so I use my DigiMoto to figure out my HP.
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Old 11 Oct 2004, 09:20 am
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I thought the "Aspect Ratio" was all about tire size? Read the write up on this information about Plus Sizing your tires....

http://www.discounttiredirect.com/di...PlusSizing.jsp
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Old 11 Oct 2004, 10:51 am
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Hmmmm. Maybe you're right. Unfortunately, the biggest downfall with DigiMoto software with me is that there are no manuals, either online, hardcopy, or softcopy, just an email address. I had emailed them, but I'm still waiting for a response.
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Old 12 Oct 2004, 07:01 pm
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Aspect ratio is the middle number in a tire size such as 245/45/17. Basically indicates the height of the sidewall as a ratio of the tire width. In the above case the side wall height is 45% of the width of the tread (in MM).
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Old 13 Oct 2004, 09:47 am
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ed,
i think you are looking for what is called the final drive ratio. that when combined with the gear ratio for the specific gear and tire information you can then calculate the overall ratio.
i will check and see i may have a microsoft excel program that will do the calculations for you.
-derek
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Old 13 Oct 2004, 10:37 am
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Quote:
quote:Originally posted by Cal Cruzer

Aspect ratio is the middle number in a tire size such as 245/45/17. Basically indicates the height of the sidewall as a ratio of the tire width. In the above case the side wall height is 45% of the width of the tread.
[|)] agree.
As long as your overall diameter is the same as stock, I think you'd want final drive ratio, not aspect ratio for HP calculation.
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Old 13 Oct 2004, 09:20 pm
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Quote:
quote:Originally posted by RallyDRock

ed,
i think you are looking for what is called the final drive ratio. that when combined with the gear ratio for the specific gear and tire information you can then calculate the overall ratio.
i will check and see i may have a microsoft excel program that will do the calculations for you.
-derek
Ahhh, yes I bet that is what he is looking for. The manual ratio is 3.29 and the autostick is 3.91 accordintg to http://www.ptcruiserforum.com/
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Old 14 Oct 2004, 04:15 am
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Thanks for your help. I finally received a reply from their tech support (slow) in which he replied...

Quote:
quote:The aspect ratio is the info that you get on the outside of a tire. For example a typical car may have a tire with an aspect ratio on it of 225 60 R16. Put the info in the program as the it is read on the tire. In this case enter 225 60 16.
I may return the software and try out AutoTap. The thing I like about this is that gauges you can configure so it looks like a car guage. Anyway, I'll post my findings once I get them. I have 30 days to return the DigiMoto software at least.

The other big plus about AutoTap is that it can be used for whatever vehicle protocol (ISO, VPW, PWM). Unlike DigiMoto, you need to buy the hardware for the type of vehicle. Although DigiMoto is alot cheaper ($119 USD) initially, it only includes one protocol. If you want to be able to read all types of vehicles, you can buy all 3 protocols for $254 USD. While the Autotap has the ability to scan all types of vehicles for only $199.95 USD.

Anyway, I'll post my finding for those interested.
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Old 12 Feb 2005, 03:40 am
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Quote:
quote:Originally posted by Cal Cruzer

Quote:
quote:Originally posted by RallyDRock

ed,
i think you are looking for what is called the final drive ratio. that when combined with the gear ratio for the specific gear and tire information you can then calculate the overall ratio.
i will check and see i may have a microsoft excel program that will do the calculations for you.
-derek
Ahhh, yes I bet that is what he is looking for. The manual ratio is 3.29 and the autostick is 3.91 accordintg to http://www.ptcruiserforum.com/
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