If my beetle is making 146 hp atw How much is that at the

Poraga

If my beetle is making 146 hp atw How much is that at the engine and is us hp different to Australia hp?

yamaducci · Posted: Tue Jul 15, 2014 7:10 am Post subject:

You should be about 158 at the flywheel.
I do not know if the translation is the same over there in Austraila. You might need to look that one up.
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mark tucker · Posted: Tue Jul 15, 2014 7:12 am Post subject:

it's a little more at the flywheel,but kinda hard to drive ir with out the trans.

Poraga · Posted: Tue Jul 15, 2014 7:19 am Post subject:

Ok cool the guy who built me the engine siad it would be 180 hp at the engine why i was double checkin as it didt sound right

Poraga · Posted: Tue Jul 15, 2014 7:21 am Post subject:

Sry he said 146 atw is 180 at the engine? 25% slipage?

yamaducci · Posted: Tue Jul 15, 2014 7:25 am Post subject:

Anvil · Posted: Tue Jul 15, 2014 7:25 am Post subject:

1 Horsepower is 1 horsepower the world over. If you were converting horsepower to kilowatts, then there'd be a difference. 1-hp is about 3/4-kw.
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yamaducci · Posted: Tue Jul 15, 2014 7:26 am Post subject:

Poraga · Posted: Tue Jul 15, 2014 7:27 am Post subject:

Jesus ans this is Australias best vw engine builder Rolling Eyes

gt1953 · Posted: Tue Jul 15, 2014 7:30 am Post subject:

Also something to consider is the elevation. Have the vehicle on a Dyno for sure, I did. This was at 5000 feet and you will loose power at elevation.
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Anvil · Posted: Tue Jul 15, 2014 7:30 am Post subject:

180 at the crank and 146 at the rear wheels on a chassis dyno sounds about right to me.
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Poraga · Posted: Tue Jul 15, 2014 7:33 am Post subject:

So its possible to be 146atw to bw 180 hp at the crank? It has a wegdemated crank if that makes a deffence ?

74 Thing · Samba Member Joined: September 02, 2004 Posts: 7393

There is loss due to brakes dragging, tranny, and tire friction on the dyno roller. 20% loss is not uncommon. That would put you close to your 180 figure.

[email protected] · Posted: Tue Jul 15, 2014 7:45 am Post subject:

146/.85=171
146/.80=182

So, 170-180 is very close.
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Towel Rail · Posted: Tue Jul 15, 2014 9:51 am Post subject:

Anvil · Posted: Tue Jul 15, 2014 10:11 am Post subject:

Alstrup · Posted: Tue Jul 15, 2014 10:37 am Post subject:

This is a no frills way to explain hp:
http://auto.howstuffworks.com/horsepower.htm

Here is another:
http://www.viewamerica.net/art/en-horsepower.html

There is really no way to give an exact or just reasonably exact estimation on flywheel hp out from wheel hp. The variables are way too many.
Tire size, tire type, tire pressure, gear ratio, drag in transmission and rpm. The number can vary from approx 15 - almost 30% a rule of thumb is 17-20%
From that John C´s calculations are about right.

T

jfats808 · Posted: Tue Jul 15, 2014 11:24 am Post subject:

Forget numbers. Too many times, people get caught up on numbers. I always estimate on the low side when giving an estimate to customers. Short of something obviously wrong with the engine and its output, its time to enjoy the engine. 150 hp is a lot in a vw engine and for a street machine.
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Quokka42 · Posted: Tue Jul 15, 2014 1:39 pm Post subject:

A 146 RWHP on a calculated 180 flywheel is pretty good. 20% losses is a pretty commonly accepted fudge factor for VWs. A lot can vary according to the fudge factors added in by the dyno operator as well. The difference the OP is probably thinking of is the old SAE vs DIN figures, where different operating conditions such as removing all accessories made for different figures.
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fastfil · Posted: Tue Jul 15, 2014 1:47 pm Post subject:


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