Planet 9

I dynoed my CS yesterday. Mods include Milltek headers, Softronic and desnork. It shows only 225bhp at the wheels. What's the problem?

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I think they have something punched in the computer wrong. It says you have 253.1 in the printout part. I just don't think they have the correct graph reading.

I had the same thing happen to me and it was a quick input of something and it was fixed.

Give them a call and see if they can print it out correctly.

Dynos should be used for before and after comparison purposes not for determining absoulte h.p./torque numbers. Why? Because they are not always reliable for that purpose due to software and individual make. Operators can also fudge results up or down or just be inept. Just use it as a before and after tool and hope you have consistent input. If you complain be careful because the operator can often give you what you want.

And have them run it in 5th gear (closest to 1:1)

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996 GT3 lower control arms at all corners
997 GT3 front sway bar
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Hawk HP Plus pads

The temperature (28.3 deg C) is well above the temperature for a standard day (15 deg C). The increased temperature will reduce the engine power. There are corrections that can be applied to correct for non-standard temperatures. Ask the dyno operator if these corrections were applied.

You should go to IA and get dynoed

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Techart GT (X51)
RIP FASTCROC
2010 VW GTI
2009 VW Touareg
2006 Techart Cayman GT
2001 Audi A4 1.8TQ (RIP)
2001 VW Jetta 2.0
some people like the regular stock factory look, cool people modify the car.
http://www.planet-9.com/reviews/show...00&ppuser=3437

The important question here is what was the HP before your modifications? As others have pointed out this dyno is not an accurate depiction of your true horsepower, but that aside if your pre-mod runs were say 30hp less then wouldn't you be pleased regardless of whatever the number says? You cannot compare one dyno to the next with any degree of pinpoint accuracy but this dyno is far enough off to say that "something" isn't right, but even if the ultimate number isn't right, the before and after may still provide a reasonably accurate delta %.

For example let's say your before dyno showed 200 and your after showed 225, a gain of 12-1/2% over stock. Now if the dyno were say a different one that showed your baseline to be 265 the same percent gain would translate to a 33.125 hp gain or just over 298 at the wheels. I think you'd be pleased with that wouldn't you? So what were your before numbers?

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K-Man S

It's a tip right? It's about 20% drivetrain loss... so 236 at the wheels, OK...

Also is the Softronic tuned for local Singapore extreme humidity and temps?

Normally a correction is automatically applied, and this is one really bad source of error in Dyno testing. For example, a temperature senor exists at the dyno itself for ambient readings and usually there is a mobile one that is placed near the air inlet. If the mobile one is placed near a really hot spot the DYNO thinks the engine is sucking in really hot air when it is not, so the compensation is over applied and Bingo, you get more HP reading as a result. The correction applied is in the region of 2% depending on the temp delta.

225 is wbhp, 253 is adding back tranmission loss for Tip, 259 is the one adjusted for ambient temperature.

Does the gear ratio makes a difference to wbhp? I didn't do a dyno before mods but my mods can always be reversed. I specificially asked Scott to account for the hot and humid weather here. And honestly I could feel more power after installing Scott's software.

What were your dyno numbers BEFORE your modifications?

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K-Man S

Also if the dyno is not calibrated for the altitude you will get very much lower readings. Lets say you dynod the car at 1500 meters above sea level, it can only do about 84% of the sea level power. If this is not taken into consideration you will get much lower readings.

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EJP
E.J.'s Cayman S Gallery

I think you got the fabled, one in a million low powered "lemon" Caymans. You are screwed. It had to happen to someone.

Sorry, I couldn't resist praying on your fears. I am sure all the above advice is right. If your car runs well, there is no way your HP is really that low.

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Life is not a rehearsal

Agree 100%. I've been through this with the 944 Turbo that I just sold. I had the same car on 3 different dynos and there was more than 50 rwhp spread from the highest to lowest readings! Dynos are tuning tools. They should not be used for comparing your numbers to somebody else's.

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John
'07 997 GT3

Previous cars:
'07 Cayman S
'89 944 Turbo
'86 944

Yes, that desnorking will get you every time. Massive power loss/gains. http://www.planet-9.com/cayman-mod...-snorking.html

Cheers

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'o6 Cayman SArtic Silver/Black leather

I would go to another dyno place!

I didn't do any BEFORE mod dyno. Although my mods are totally reversible, I am too lazy to back up for another dyno. I am just going to rely on my butt dyno and intend to use G-Timer for 0-100km as a reliable whp proxy.

Good plan. Most mods result in gains too small to make much of a performance difference so if you feel improved performance you are ahead of the game.

My 0-100km time averaged 6.1s for a Tip at an ambient temperature of 86F. My car is fully loaded including front and rear trunks.

what's loaded in your front and rear trunks?

if they're fully loaded with feathers, it'll be much faster than if they're fully loaded with your collection of fishing weights