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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 18th, 2017, 11:24   #91
Macradiators.com
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Measured on 2 different dyno. Injectors not even the owner knows who makes them, we have tried to trace the package haha ..imagine that, to see where it came from.

Im sure if Ruben makes huge power he wont say anything about important HW parts.
Just the way things are.
Will see soon how it goes on 402m.
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Old May 18th, 2017, 12:13   #92
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30% losses.. as in over 100hp, sounds a lot.

What you guys need to realize is that major part of losses are an additive component, and only a small part are factor componenent.

Example

100 engine hp car driving 250 kph on rollers (4wd 2 rolls per wheel) has lets say 65 whp. Making for 35 hp or 35% loss at 250 kph. Lets say 30 hp is loss of tyres at the wheels, and 5 hp is loss in gearbox/diff etc.

500 engine hp car driving 250 kph on same dyno and 450 at the wheels. Due to the slightly larger slip of tyre, the tyre loss might now be 35-40 hp, and geabox loss lets say 10-15 hp. Making the total loss only about 10-15% max
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Old May 18th, 2017, 16:56   #93
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Quote:
Originally Posted by Macradiators.com View Post
Measured on 2 different dyno. Injectors not even the owner knows who makes them, we have tried to trace the package haha ..imagine that, to see where it came from.

Im sure if Ruben makes huge power he wont say anything about important HW parts.
Just the way things are.
Will see soon how it goes on 402m.
I am sure now kids beat you up at school
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Old May 18th, 2017, 23:37   #94
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if you say that about Ruben you are heavily mistaken...


Quote:
Originally Posted by Macradiators.com View Post
Measured on 2 different dyno. Injectors not even the owner knows who makes them, we have tried to trace the package haha ..imagine that, to see where it came from.

Im sure if Ruben makes huge power he wont say anything about important HW parts.
Just the way things are.
Will see soon how it goes on 402m.
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Old May 19th, 2017, 06:57   #95
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Quote:
Originally Posted by raffshore View Post
I am sure now kids beat you up at school
Couldnt be more wrong about that

only 15% loss on quattro? wow
maybe on a FWD
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Old May 19th, 2017, 10:28   #96
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Last quattro I dynoed had 295whp and 337 calculated at the crank. A6 3.0TDI Tip.
Measured in fourth gear. Losses go up if speed is higher.

The dyno had large 600mm diameter rolls. With smaler rollers and cradle rolls ( ie dynamics, mainline, bosch lps,) losses are usually tad higher.


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Old May 19th, 2017, 11:02   #97
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jep. type of roll makes biggest impact on losses. and you cannot say this losses in % of engine HP. if you double engine HP these losses will be nearly constant if you drive same speed on the dyno
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Old May 19th, 2017, 11:54   #98
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I find that the small roller dynos are more accurate than the large roller ones.
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Old May 19th, 2017, 12:04   #99
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Using a dyno to measure before and after is fine but without strapping lots of cars down at the same day on the same dyno it's hard to measure with certainty or accuracy especially as it seems some peoples figures are crazy. Or you can gain free bhp by adding "w" before the "hp"

I prefer 1/4 mile times (mainly terminal speeds) as an indicator of performance as it's generally harder to fudge the figures and provides greater indication of real world performance.
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Old May 19th, 2017, 14:02   #100
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I personnally look more a 100-200km/h times (especially when done with 5hz or higher gps rate) as on a 1/4 some cars suffer of traction problem.
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Old May 19th, 2017, 14:07   #101
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Quote:
Originally Posted by mrchill View Post
I find that the small roller dynos are more accurate than the large roller ones.

Opposite. The bigger roll the less loss at tyre.

On dyno with 2 8' rolls per wheel a 4wd 100 hp car has like 0 wp at 270 kph. Doesnt sound good no?
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Old May 19th, 2017, 15:59   #102
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Interesting. Because we have tested it over and over...and gotten confirmation from the dyno manufacturers that the small rollers with less inertia are more accurate than the large one...also, they (small rollers)are more sensitive to changes(when diagnosing driveability). One thing we do besides always using the same dyno when charting changes, is to run a couple of stock, unmodified cars first, in order to get a sense of the dyno and the operator....as these are also factors in addition to the settings.
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Old May 19th, 2017, 21:44   #103
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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%.

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Old May 20th, 2017, 01:09   #104
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Playing with parameters on the latest Soft Engine dyno ..only gained 3hp. Cant mess with it, a 390hp rated car tuned elswhere , gave only 347 on this one.
It just re calibrates and throws out the same result if you mess with it.
I guess this tuner wont be making world record numbers on it.
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Old May 20th, 2017, 01:53   #105
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Quote:
Originally Posted by mrchill View Post
Interesting. Because we have tested it over and over...and gotten confirmation from the dyno manufacturers that the small rollers with less inertia are more accurate than the large one...also, they (small rollers)are more sensitive to changes(when diagnosing driveability). One thing we do besides always using the same dyno when charting changes, is to run a couple of stock, unmodified cars first, in order to get a sense of the dyno and the operator....as these are also factors in addition to the settings.
Yes, very intereststing is that the only type of roll allowed to do emission certification for example is a big single roll/wheel with 48' diameter. must be pure coincidence
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Dyno'd area, Old VNT20 setup dyno'd 192whp
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