SEE UPDATED DYNO POST #19 BELOW...

Today was the enthuisast/mod day over at Maryville Honda (central Ohio).

Good turnout, even with the rain!

I was the first to try out the portable dyno they had there.

Temp 48F
I did three pulls with numbers in the low to upper 250 HP range to the rear wheels.

My max was 257 rwhp.

The car has 1800 miles on it and is completely stock.

Is this good/normal/bad?

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2006 Cayman S
Carrera White/Black
2007 Audi A4 Avant
S-Line, Titanium, Blk/Blk.
2007 Accord EX-L
Blk/Blk, Springs, Tint

Assuming 15% driveline lose

257 x 1.15 = 295.55 bhp

Seems like exactly what Porsche advertises.

What kind of dyno? For a DynoJet, most stock numbers are around that figure, again you can't really compare dyno to dyno. What you can do is start making changes to your car and run it again on that very same dyno to see what the delta is. I have seen stock Cayman S's dyno from 220hp to 272hp on a dyno, again depends on the dyno as to what they show. You could also get another stock Cayman S to run on that same dyno and see what it produces.

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K-Man S
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Thanks for the response Ken.

Their website says "Our portable dyno chassis is a Dynojet Dyno."

Has anyone dynoed their car with low miles on it like mine and then dynoed later to find an improvement?

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2006 Cayman S
Carrera White/Black
2007 Audi A4 Avant
S-Line, Titanium, Blk/Blk.
2007 Accord EX-L
Blk/Blk, Springs, Tint

Cool.

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2006 Cayman S
Carrera White/Black
2007 Audi A4 Avant
S-Line, Titanium, Blk/Blk.
2007 Accord EX-L
Blk/Blk, Springs, Tint

i dynod mine on 3500 miles,
with 20" rims
evo intake
miltek catback
ecu remap
desnork

with dynamic dyno..
and the result is ... 228.9 hp!!

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06 cayman S,
Techart GTS set

Mr Clean: Sounds right there to me.

StatiX: Sounds very low to me. 228hp with flash, intake, de-snork, and Milltek???

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oh well...

Sounds like 20" rims is heavy and affects inertia hence rwhp.

Not to nit pick but a 15% loss would be 295HP at the crank X .85% = 250.75 HP RWHP. 257 RWHP is a tad less than a 13% drop which is about as good as it gets. Or then again maybe the loss really is 15% but the crank HP is over 300.

Mr Clean, below is my recent dyno done on my Cayman S pre-mods. My results fall in line with yours.

Dynojets typically read high in my experience.

There was an article in Car and Driver a few years ago where they tested various wheel sizes, weights, etc. against a dyno. I remember that there were more losses the bigger you went, in general, but 228 hp seems awfully low. Dyno must have been pessimistic also.

http://www.sdsefi.com/techdyno.htm

Interesting read on some factors affecting wheel dyno's