JohnCA58

STD is the old correction factors that was in use and some still use them because of the higher numbers produced, SAE is the industry standards now in use by most dyno's and show about 5% lower numbers, not just Dynojet. they can produce their own correction factors but can not compare the numbers with anyone else, which we should never do anyways unless we can produce the exact atmospheric condition for both dyno's.

JohnCA58

This is a good read on correction factors.

https://www.dynomitedynamometer.com/...horsepower.htm

dedens

Are you saying that my numbers are accurate or inaccurate? Just curious

AWDGuy

A dyno was used for tuning and it shows the gains here. Doesn't matter what method was used as long as they aren't changing methods between runs to purposely inflate the numbers.

dedens

So based on the Dyno Technician's explanation my gains are real. Either way...I recommend the Viezu tune and the dyno process. Hope others can learn and enjoy from this discussion!

HAPPY MOTORING!

Silk

Which topgear exhaust do you have? X-pipe or crossover?

JohnCA58

They are what that dyno put out, I am not familiar enough with the P-car output to say they are inflated or not.

dedens

I purchased the cross pipes. 200 Cel Cross Pipes and FisterD cans sound amazing.


My current exhaust setup:


FisterD: http://fdmotorsports.net/fister-exhaust-996/TG 200 Cel Catshttps://www.topgear.co.uk/porsche-91...ll-sports-cats

TopGear 200 CEL Cats: https://www.topgear.co.uk/porsche-91...ll-sports-cats

Fabspeed Quad tips: http://www.fabspeed.com/porsche-997-...ad-style-tips/


Short Install/startup video: https://drive.google.com/open?id=0Bw...1l0VUVTdk1jMVU

tekkie

all of the dyno pulls were included in that price? how long did it take them each time to send back the files

never heard of the company but clearly it worked well

MoeMonney

I bought performance software from them for a Volvo S40 years ago. Worked great and had a great price.

AzDropTop

Thank you for sharing. Seems like a nice gain. Are there any downsides to tuning these cars? Thanks again.

dedens

I dropped the car off at PreRacing at 9am and picked it up that day at 5. $750 included the cost of the tune, the dyno pulls, and the adjustment of the tune. IMO its a great deal and I am very pleased with the outcome! So far there haven't been any downsides. I put about a 50 miles on the car since the tune. I will keep this post updated if there are negatives.

MoeMonney

Are you running and underdrive pulley?

5CHN3LL

As long as the tuner knows what he's doing and the car is equipped to handle power gains, no, not really.

However, I would never attempt to tune a vehicle without a wideband installed...the cost of installing an additional o2 sensor is trivial compared to the cost of rebuilding a motor because it leaned out too much during the tuning pulls. Is a wideband necessary when using the Viezu, or does it use the data from the factory sensors?

dedens

To answer questions from 5CHN3LL and MoeMonney...I am running a stock pulleys. I did not use a wideband. According to the shop, Viezu uses information from the ECU and dyno.