Dyno results from mods

[nastyboxster]

I understand that dynos can vary depending on type of dyno, gas, temperture, spark plugs etc., but will it make that much difference if I wait a week before dynoing it?

Question for dyno experts
1. How much of a difference can it vary? (clubhead mentioned 2-3hp)
2. If it's only 2-3hp, does it matter since I won't be able to feel it anyways.?
3. I've seen several Boxster S dynos with no mods and it's between 220-225rwhp. Anyone seen any with below or above it?

[ClemsonBoxster]

NastyBoxster, I have a 2001 S Boxster mostly with all the same options as yours. Looking to do some mods and have been recommended locally to with two different exhausts - one place recommends the Fabspeed (Dansk) and one place recommends the Borla. I was leaning toward the Borla Exhaust, Secondary Cat Bypass and Evo like you did. I know the exhaust is going to run me $1,000 installed. Did you get the the Cat Bypass Pipes from Fabspeed? If not, where did you get them?

What did the Bypass Pipes and Evo Intake cost you to install. I know the pricing on those two mods are $900 combined, just curious what the installation ran you?

And in South Carolina we have no state inspections, so no worries about failing emissions.

Thanks.

[clubhead]

Originally Posted by nastyboxster

...
Question for dyno experts
1. How much of a difference can it vary? (clubhead mentioned 2-3hp)
2. If it's only 2-3hp, does it matter since I won't be able to feel it anyways.?
3. I've seen several Boxster S dynos with no mods and it's between 220-225rwhp. Anyone seen any with below or above it?

Need to qualify I'm no dyno expert but I'll try.

The main concern if you dyno between a period of time can also be attributed to the machine itself. These machines are sensitive equipment and by themselves, will already have a certain amount of variance. This will be excerbated by other elements like intake temp, humidity, car's engine oil temp, new/old plugs, etc.

Now IF the machine owner recalibrated the dyno in between (and you will not necessay know this), the variance would even be greater.

So to be safe, do the before dyno before you plug in the new program. Plug in the new program and go for a 20 mins drive. Then do the dyno again. It's a hassle but it's the only way to satisfy yourself that those gains are mainly due to your new program. The variance can be 2-3bhp but if the gains are 5bhp, you may be getting only 2 bhp increase with the variance taken into account. This is assuming the machine read lower than actual. Aren't you gonna feel ****************ty if you've spent $1k on a program and thought you've only gained 2bhp but actually it's 5bhp? Or vice versa....

[986Jim]

Here is an interesting article from Turbo Magazine about dyno's..

http://www.turbomagazine.com/tech/0306tur_dynodash/

I have been on a DynoJet 248 and Clayton Waterbreak AWD dyno..

The Dynojet 248 was always very close whenever I used it. They ahve a sunken 1000lbs roller in the floor. They have the most repeatable results time after time, seem to be the most fool proof too.

[nastyboxster]

ClemsonBoxster

I got the bypass pipes from Fabspeed. I was charged 2 hours or Approx $200cdn for the Evo Air intake by a Porsche shop. 1 hour or $100 for the bypass pipes. I recommend the Air intake done by a Posche shop or someone who has done it on a boxster before, but the pipes can be done by anyone. Make sure you get a firm quote for the intake since the actual hours spent by the shop was closer to 5 hours.

With regards to the muffler, I got the Borla by default. Someone just purchased it at our local club and said it was too loud for him, so I got a deal on it. I was going to get the fabspeed one. It depends on your taste for the sound. The Borla is very loud and have low rev resonance, but it is very sweet when you rev it up. The Fabspeed is quietier, but don't know how much. The Borla is cheaper and lighter.

So far, I've gotten a lot of complements on the sound, especially on the track.