If you do dyno, do it on the same day as close as humanly possible. Temp and humidity combined with variances in the machine and in the car may nullify or amplify the results.

 

at least just do it on the same dyno. correction will take care of temp and humidity differences.

 

Same Dyno, Same day, Same Tech, same underware too? What's my acceptable margin of error around here?

 

none. just kidding. the only critical thing is the same dyno. day and temp aren't super critical. just have the runs done corrected. don't forget to tell the operator to run it in 4th gear and have him hit the rev limiter. it's very soft in 4th gear and will gently shut it down. you'll need at least 3 good fans too. tell them that ahead of time. one for each radiator and one for the engine compartment. make sure they give it a few minutes between runs to get rid of some of that heat.

 

Yes...make sure the clothing on your back is identical in each consecutive dyno run. We need to ensure you weight the same...which may affect the amount of pressure on your tires which could affect results. If you didn't **** before your previous run...be sure to hold it in during the run the second time around as well....if it was the dyno operator who actually did the run in your car, call in advance (as mentioned) to make sure he doesn't **** that day before dynoing your car....

--- Kevin

 

I was afraid of this!! Only on our pesky, money intensive, German beasts would a shred of HP be so dear! Do BMW guys go through this? I'd like to tell my wife just in case she decides to supe-up her 530. I've narrowed my search to dynos that measure to the nearest nano-horsepower. And, I've started today on a diet of pure corn meal so that my **** has accuracy. Stay tuned, gentlemen, we are mere days away from HP enlightenment, (weather permitting) or wallet lightening for no cause.... We'll see... Oh, uhh, one other thing; will I need a witness? I mean, if I end up with another 30 HP will I be accused of driving a 930 to the second run?

 

bring a thumb drive. they can dump the dyno charts on there and then you can post them. will you be doing a before and after run or just the after?

make sure they put the fans in the exact same places on both runs. moving the fans can really alter your HP readings on our cars.

 

Yes, 'll be doing both before and after readings. The curiosity is killing me!!

 

John, any results?
A friend gave me his evo intake kit (sold his car), I'l test it as well.

 

Not yet... The last box came UPS yesterday. I'm just waiting on Eric to send my calipers. Then I'll put the car up in the air for a couple of days. While the ECU is out to GIAC getting flashed, I'll install my parts and then hit the dyno. I should have some numbers for you by the end of next week. It's going to be pretty cool doing all the mods in one shot. I never did that before.

Think we should start on how much or how little HP will result??

 

I did not dyno my car when it was stock only because I didn't own it then

But i did throw it on the rollers when I first got it and laid down 270 at the wheels.. so that would be over 330 crank HP.. anyone know what the loss is in the powertrain for 911's?

My mods at the time were Fabspeed intake with stock filter/Headers and exhaust (fabspeed) and unichip piggy back computer (still needs tuning work)

recently added BMC intake (noticed a difference) and going to order Fabspeed cat-bypass pipes soon. I really would like to dyno before i add the cat-bypass pipes....

 

Just thought I would chime in here. Our V-Flow system is not even close to the same product as the Fabspeed "silicone hose" I do not know how one could see a 25% flow increase with a silicone hose. We spent months developing and testing different air intake set ups to squeeze power from the 996/997. Additionally, we spent hours testing different prototypes on a Superflow flow bench and 25% was a difficult number achieve.

In order to make more power with the V-Flow system we had to incorporate a 6" injection molded venturi to help draw more air into the engine with less restriction. Additionally, we utilize a 6" opening cone filter which has superior flow characteristics to a flat panel filter in a stock airbox.

It is my opinion that the technology and design in these two products is not even close to being the same. A silicone hose vs. a real world tested and engineered air intake system using cutting edge air flow technologies with guaranteed power results is like comparing apples and oranges. We guarantee our product power gains and customer satisfaction.

 

Okay, Todd. I'll buy that - actually, I did buy it. I am about to install your V-Flow box; plus - headers, cat bypass, FF sport exhaust, and GIAC flash. I can't be the first guy to have done this. with all your testing, roughly, how much of a difference will I see on at the dyno on my 02 996?

 

On top of that fact as I was saying.. the EVO kit actually comes with a smooth silicone hose to connect to the throttle body anyways.. But that's not where the power comes from that's for sure You're getting more surface are with the cone and particularily at the point where a panel filter is dirty and sucking the most air from... Hence the EVO ones brings more air in..

 

John,

It depends on the components that you purchased. Not all components are created equal and not all components have been tested to work together. I have never tested your setup. There are a lot of products on the market that are not tested and may or may not work, especially together. I have tested many different manufactures headers systems and only 1 system made power. I am not sure how the bypass pipes will work but I tested high flow catalysts on the 3.6L and saw no real gains. Part of my job on a regular basis is to test our own products and other products to see if they work. Our dyno was purchased for this and only this purpose. If we find that certain products do not work, we don’t sell them. We want to offer our customers products that work and work well together.

Back to your question, I have no idea. You may find that you make 12 HP or 25 HP. Some products will counter affect the positive results of another. The lack of back pressure may cause a loss in low end power and a gain in high RPM power. I don’t mean to be vague but this is the reason we offer tuned stages of upgrades is so our customers can maximize their power output and money invested.