Hi!

I'm new to all this and already spent countless hours on reading through all the VERY interesting things regarding ECU-tuning so I'm prepared when I finally get my Evo-IX ... (Still looking for a perfect one ... )

While reading I was just wondering ...

When I'm tuning my Evo with EcuFlash and I'm looking for the MBT would it be possible to do that with a Virtual Dyno? Are these accurate enough? Or will it just be possible through knock-sum?

I was already looking for an answer on that but couldn't find anything.

Thanks a lot!



Greetings from Austria!

 

Yes, Virtual Dyno can be used for tuning.

Remember, a dyno is simply a machine that is attempting to simulate driving on the road. With Virtual Dyno you actually are driving on the road.

(Hence, the typical EU terminology of Rolling Road, whereas on this side of the pond we say Dyno.)

 

it matters what fuel you are tuning on. E85 is special and you cant just tune to MBT.

 

You mean to say "E85 is special and you cant just tune for knock"

Because when you tune E85, you tune for MBT.

 

Hi!

I know that a Dyno (Never ever heard "Rolling Road" here?!? Just Dyno or similar words in German ... ) also just simulates. But since a Virtual Dyno is just calculating the torgue through the speed the RPM are raising I thought it could be difficult when just changing the timing for 1 RPM range since it will probably run quite quick through this range when having power and the difference in time will just be rather small when gaining just some torgue. A real dyno knows exactly which force is used to brake the power so it can probably calculate more accurately and see the differences more easily. It also doesn't use the RPM of the car (doesn't it?) to calculate power. As far as I know it uses the speed of the roll and this speed will probably also be easier to resolute higher/better/more accurate vs. time?

Just some thoughts ...

Yes, already know that E85 has to be tuned through MBT. One of the points why I was asking.

Thanks a lot!



Regards

 

I use VD for my tuning comparisons quite successfully.
The biggest thing with it being a RPM/speed style calculation is that you use the identical section of FLAT road for all your power runs.
This I believe makes it accurate enough to check all your changes for power increase/decreases.

 

Find it no different then when using a real dyno. yes virtual dyno can be alittle harder then a real dyno in finding mbt, so tune carefully & use the same stretch of road!

EXAMPLE: I did run into a issue once with my car tuning for max torque at 40psi but it was because i was going over a bump on the road and causing inaccurate readings. so if the roads smooth and flat and everythings working the way it should, it should be easy to find your max power safely.

 

yes that is the key to doing it. same stretch of road. it does work pretty good. its more time consuming then a real dyno, but it definitely works.

 

Its a bit cheaper than 80k+ for a AWD dyno though.

 

Hi mate,
All these virtual dynos (that exist long before this community was born) aren't precise enough to tune for MBT, they can only give you a rough idea of where you are.
Repeatability is what they lack. Test by yourself, same road, same day, same tune, do 4 or 5 pulls and compare....is them precise enough for MBT tune?
Anyway, you can do a good tune also without a real dyno, evoscan is a good logging software.

 

That is absolutely not true.

 

ya not true at all. its very easy to see changes in power with virtual dyno.

 

Not true at all....I have gone down the same stretch of road and am always within a few hp - identical to what happens on a dyno after repeated sessions. In fact, I prefer the street tuning as it the real load on the car, air flow, etc. Just my $0.02.

 

Guys, don't be blind.
Compare an UNCORRECTED virtual dyno with an uncorrected real dyno, and you have another factor of inaccuracy.

 

All that is needed is accurate and precise RPM logging, consistancy and repeatability of boost and AFR, use of same stretch of road, AFR maintained optimally, conditions same, and not be octane limited

I love threads like this, you can learn who is full of hogwash and who is reasonable.