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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old May 20th, 2017, 11:28   #106
Macradiators.com
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Rollers or no rollers 420hp bmw just did 11.6s on 402m
A5 manual transmission and worse injectors ever. 420hp did 11.9s
Both cars street legal diesels, fully equipped.
These guys drove 800km to get here. Geez

Its time for bigger turbos for bmw.

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Old May 20th, 2017, 16:38   #107
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Not in this country. Most of the dynos used for emissions are small roller dynos.
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Old May 20th, 2017, 17:25   #108
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The size of the dyno rollers doesn't matter for emissions testing because vehicles are tested at speeds corresponding to national speed limits and never tested anywhere near their rated power. Tire deformations are lower and do not factor in much when the key is following a speed-time course rather than measuring outright acceleration rate and power output. It is nevertheless quite certain that certification centers are not using Dynojets, Dynapacks, Mustangs, or any of the brands commonly used in the aftermarket LOL. Each testing body will set standards and procedures, and repeatability and consistency are far more important than what technology of roller is employed.

Edit: About dyno losses, AWD and slushbox automatics will have larger driveline losses, but not in the order of 30% and certainly not linear to the engine output
http://forums.tdiclub.com/showthread.php?t=75062

If there's ~100kW lost at the driveline or tires, you will definitely see this with infra-red imaging - actually you won't even need to - your tires will certainly melt and your transmission/differential will need forced cooling with massive heat exchangers.
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Old May 21st, 2017, 02:04   #109
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Quote:
Originally Posted by Macradiators.com View Post
Rollers or no rollers 420hp bmw just did 11.6s on 402m
A5 manual transmission and worse injectors ever. 420hp did 11.9s
Both cars street legal diesels, fully equipped.
These guys drove 800km to get here. Geez

Its time for bigger turbos for bmw.

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Impressive time for the A5 - What kind of timing gear are you guys using? Please don't say a casio stopwatch.
The reason I ask because even with 440hp/900nm I can't get into the 11's
This is with 900nm take off from the line in a TIP gearbox
Best I can get at santa pod is 12.3
At another drag strip I managed 12.1
But never 11's

So far you have stated a 100 to 200 of 7.x whereas everyone else is in the 11.x with sameish power
1/4 miles time that appears be unrealistic

Would be nice if you can post vcds logs with speed and time stamp.
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Old May 21st, 2017, 11:34   #110
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Official certified timing gear from USA, its international event.
You can contest any dyno number you want, but you cant comment about timing :P

Today we had cars from BG doing 9.1s , Moldova GTR godzilla done 8.7s , gti 9.5s , 911 1250hp porsche constant 9.7s, r35gtr 1000hp 9.8s
No bike went under 10s, 10.2 was best

Tdi cars were a disappointment, lupo tdi 4x4 12s , lots of 2.0 pd in 12.x seconds

2 identical cars at 400hp from different tuners will never go identical..1 will always beat the other
Owner will present his car on the forum shortly.
Details later.

Meantime from car's CAN


Lots pf cars 3.0 doing 12.1-12.2 , 2.0 class was not so strong, lots broke
BMW doing constantly 1.6-1.7s 60ft and about 10runs at 11.7 , 3 runs at 11.6s
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Old May 26th, 2017, 00:06   #111
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Congratulations! Looks like eastern europe cars are much more powerful and faster. Actually not a surprise for me.
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Old May 30th, 2017, 23:55   #112
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Now i see it's a SuperFlow dyno..not known for the accuracy
Just to have a comparison look at Superflow from JD engineering.. 450hp on stock everything with just IC and exhaust on the 3.0 Bitdi .. says it all

the 537hp claimed and 409whp measured ..did 12.7 seconds and broke, not a happy ending
Curious is that 100hp less powered cars went much faster
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Old May 31st, 2017, 00:27   #113
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Must be because there was over 120 hp losses in the drivetrain
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Old May 31st, 2017, 00:41   #114
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Probably LOL
TBH i'm sick of high numbers on dyno that dont go fast as they are supposed to
SuperFLOW = SuperOptimism ..just go to JD eng on FB and be convinced

Ill post my own 217HP at 1.6bar boost ..LOL

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Old June 1st, 2017, 06:27   #115
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Originally Posted by hatemi View Post
Keeping in line worh the OT talk here😀

The most common dyno in US is Dynojet. Its usually regarded as the standard and what others are compared to. It is also regarded as the most optimistic of them all. As a matter a fact some other brands have "dynojet correction factor" to be able to make them read similar values as the dynojets in the area and to satisfy the fat corvette drivers etc.

Almost all of them have some way the operator can affect the readings. Dynamics with the shootout mode is a good way of keeping the operator out of the results.

Small roller vs big roller and inertia vs braked is another common battle. Both methods have their pros and cons. Inertia is accurate and simple way of measuring the power. You cant tune steady state or part load areas with just inertia so for tuning stand alone ecus they are far from optimal. This is where small roller low inertia braked dynos realy shine. You can select a rpm or speed and the dyno keeps the engine at that point no matter if the go fast pedal is at 10% or 100%.
So much crap being thrown around in this thread, calling different manufacturers of dynamometers good/bad. 95% of accuracy comes from the operator understanding the dyno and how it works... Near enough every time I see a dyno being operated, I near enough cry. The complete lack of understanding of how dynos work by operators is just ridiculous. Go watch some videos on YT of people operating dynos - wheelspin, stupid fast ramp rates, hitting the brakes as soon as the run is over, leaving the engine in gear at the end of the run, cars jumping around on the rollers... Then you see some of the graphs which are put out, which at best have the bit showing a complete cockup by the operator cut out, or some of them with the coastdown left in which has lumps and bumps in - but nobody questions it because "it was calibrated last week" and "it was $30k"...

The amount of times I hear quotes from operators such as "If you're getting traction issues, use a faster ramp rate" and from a reputable dyno installer I even heard this gem: "An inertia only run should be around 15% higher than a braked run"... Just ***.

It appears that VERY few dynamometers have the moment of inertia configured correctly in the software, I've seen this time and again that there's a huge lump in the graph where the absorber cuts in to hold the ramp rate when the engine starts making enough power, but it's just completely covered up by the fact the smoothing has been cranked to 11. In my opinion, a braked vs inertia run on any dyno with braking should yield near identical results, the only case it may not is a heavily turbocharged car on a set of rollers with a very small rotating mass. It should make no difference if the rollers are large or small, heavy or light - the configuration of the moment of inertia in software is what allows it to know how much energy was put into the rollers to accelerate the rollers when the brake was not absorbing the energy, rather the energy was put into accelerating a known mass.

A braked dynamometer is at best a "guess" to calculate the amount of power transferred from the engine via the transmission and tyres into the rollers, minus some of the energy lost in the transfer of that power. You can't measure all of it, it's simply not possible. It is absolutely NOT flywheel horsepower, it's at best a poor estimate of that.

An inertia dyno again is at best a "guess" to calculate the amount of power transferred from the engine, via the transmission and tyres into the rollers, not taking into account any amount of energy lost in that process - since you cannot measure that. It is NOT wheel horsepower, since the pressure your tyres are at make a huge difference, the surface of the dyno, the temperature, the compound...

The only dynos that can measure something approximating WHEEL horsepower are hub dynos, however, they still cannot measure exactly the losses involved in the transmission etc, they, again, can at best provide an approximation.

Unless you're going to rag the engine out and put it on an engine dyno, don't even bother have the argument, just smile and nod - because no amount of people whining xyz dyno is better than abc dyno is going to make any difference.
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Old June 1st, 2017, 10:04   #116
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I think numbers are becoming irrelevant, there has been a huge scandal over here regarding dyno numbers ..
430hp car on 1 dyno gave 387hp on another (model you cant mess with)..there are plenty of examples ..

JD is making on superflow 450hp with stock turbos and injectors (IMPOSSIBLE) on a6 3.0 biturbo
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Old June 1st, 2017, 14:50   #117
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For JD rule of thumb is -8%. i tuned few biturbos, even with dpf delete and rs6 airbox, wagner they struggle to make 1350 kg/h at 2.8 bar boost. Nets around 410-420 hp depending on the egt u like
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Old June 2nd, 2017, 12:29   #118
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Totally agree with you. Somebody tuned the same car with full exhaust, wagner etc...i think 410-420 as you say.
Completechip also tuned same car ..maxed out everything on his dyno 404 hp on 180k engine iirc.

From there they started to upgrade .injectors ..turbos. wmi etc, but remains a family car, not suited imo for drag racing.
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Old June 3rd, 2017, 03:10   #119
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http://dvxperformance.com/stage/audi...tdi-bi-turbo/2
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Old June 14th, 2017, 08:33   #120
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Quote:
Originally Posted by diffas View Post
So pointing out fake videos are now bad? My bad, sorry. I rather read something that is based fact or at least valided otherways. So here we are having just superfast and superslow cars on this topic. Huge claims are given without any solid validation what so ever. What ever to warp 9.95.
What happened to your car man? I saw it on some facebook video with white smoke?
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