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YOUR RESEARCHViezu Tuning
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It was a custom tune adjusted by results on the dyno.
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Performed · outcome unconfirmed · Original poster
Viezu adjusted tune and emailed file back to shop.
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To answer questions from 5CHN3LL and MoeMonney...I am running a stock pulleys.
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Performed · outcome unconfirmed · Original poster
STD is usually a smoothing factor again used on DynoJet software.
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A dyno was used for tuning and it shows the gains here.
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never heard of the company but clearly it worked well
A couple of weeks ago, I had my 00 C2 tuned using Viezu Mapping. The car is stock except for TopGear 200 CEL Cats and Fister D mufflers. Below are the before and after Dyno results.
I am very please with the outcome. Throttle is snappy. The car runs very smooth and pulls hard at about 4300 RPMs. Worth the $$
The baseline includes the exhaust mods. Most stock 996 have between the upper 240s to lower 250s rwhp. The increase is from the tune alone. The dyno shows the results. Not sure how the dyno shop would fudge the results...
There are many ways to fudge dyno results, one thing I always look for is the Standards they use for correction factors, the two used are STD and SAE, both are different atmospheric corrections, and come up with different H.P. and Torque. neither are listed on your dyno sheet.
Looks to me like the "tune" traded a lot of low end tractability for peak power at higher RPMs. That's OK if that is how you use the car, but I would think it would ber doggy in day to day traffic.
Actually...the power was improved throughout the complete band according to my 'butt' dyno.
. I do not feel any flat spots (which I had before). Before the tune, the idle was not as smooth as I felt it should be. After the tune the idle is smoother.
At the end of the day...whether or not I actually got 24hp from the tune....the car feels stronger, idles smoothy, and doesn't have flat spots.
The car is not a daily driver and is not tracked, It sees spirited drives on the weekend.
The total cost was $750. This included the tune/program and dyno time. The ECU was flashed in a multi step process. See below:
1. shop got baseline dyno
2. flashed ECU with tune from Viezu
3. shop dyno the car again
4. sent dyno results to Viezu
5. Viezu adjusted tune and emailed file back to shop.
6. repeated steps 2-5 until tune was 'approved' by Viezu.
This was not a one and done flash. It was a custom tune adjusted by results on the dyno. This is why I went with Viezu because the tune is specific to my car and geographical location. Very pleased with the results.
I can believe it. Especially since it was dyno tuned. This isn't some canned tune that wI'll work on 35000 different ECU's
that's some impressive gains for a tune on a NA engine.
Response from the Dyno shop about calibration:
Our dyno does not use SAE correction factors. That is what you would see on a dynojet. We use an atmospheric correction calculated by DynoDynamics which came out to around +3.5% on your day if I recall correctly. STD is usually a smoothing factor again used on DynoJet software. The pulls were done on the same day under extremely similar conditions without taking the car off the dyno or changing any calibrations. You would be hard pressed to find a better comparison scenario.
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.
Are you saying that my numbers are accurate or inaccurate? Just curious
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.
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.
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!
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 Cats
https://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
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
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
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.
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?
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.
I'm seeing ~20ft/lbs increase in torque across the RPM range, which is exactly what you need to improve performance in traffic. Where are you seeing a loss?
Never met a dyno owner/ tuner who doesn't shove a wideband up the tailpipe during runs. Just because the car doesn't have one doesn't mean it wasn't used.
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