A90 Supra MKV on the dyno

[a90moe]

Maybe tuning with Ecutek would get rid of them. I read about a lot of BM3 gremlins

Codes were present way before the tune..

So they are not tune related, just happens that the tune process brings them up when checking for DTC's at the end

I though they would go away after my last dealer visit, they replaced my headlight level sensor which broke during the dyno and it looks like they did not do any DTC clearing after

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[a90moe]

Clear it. If it comes back disable the code. These cars had that code stock. Most people never noticed though.

Thanks for chiming in Will look into disabling them

 

[Waferz]

Speaking of Supras on the dyno, I am working on setting up a Virtual Dyno file our cars. I don’t have any dynos in my area so I’ve been using a few other guys logs who have had dyno runs done for getting it close to accurate.

does anyone know:

1. the drag coefficient for the mk5

2. The fromtal area of the mk5

3. if pulls have to be done in 5-6 gear for accuracy. 4th gear seems to be the easiest to find space for and seemed to be fairly accurate with stock numbers.

 

[Twisted Tuning]

Speaking of Supras on the dyno, I am working on setting up a Virtual Dyno file our cars. I don’t have any dynos in my area so I’ve been using a few other guys logs who have had dyno runs done for getting it close to accurate.

does anyone know:

1. the drag coefficient for the mk5

2. The fromtal area of the mk5

3. if pulls have to be done in 5-6 gear for accuracy. 4th gear seems to be the easiest to find space for and seemed to be fairly accurate with stock numbers.

i have it already, can send to you later, i have 3-6th. of course 6th would be best, but most people wont do 160+ mph on the street, haha

 

[Waferz]

i have it already, can send to you later, i have 3-6th. of course 6th would be best, but most people wont do 160+ mph on the street, haha

I think I’ve got it pretty close now. Stock run shows 321/369 in 4th

 

[DioParker]

>>> ... they replaced my headlight level sensor which broke during the dyno ...

How did the dyno break your headlight sensor?

 

[Twisted Tuning]

Side by side of our 767whp dyno pull with just plugging the log in from the same dyno pull.

Weight is different as car was on dyno so changed weight to roller wieghts and etc. Look how spot on. torque is a tad high. 640 VD vs 620 on actual dyno. But not bad.

 

[Twisted Tuning]

I think I’ve got it pretty close now. Stock run shows 321/369 in 4th

No worries, was just trying to save you some time.

 

[Twisted Tuning]

How did the dyno break your headlight sensor?

they probably strapped it down right on it.

 

[a90moe]

How did the dyno break your headlight sensor?

Stupid shop broke it whilst strapping the car.. Funny thing is shop broke 2 Supra's, I only found out it was the sensor next day looking up inside a hole, other Supra same thing with the codes too

 

[Twisted Tuning]

Side by side of our 767whp dyno pull with just plugging the log in from the same dyno pull.

Weight is different as car was on dyno so changed weight to roller wieghts and etc. Look how spot on. torque is a tad high. 640 VD vs 620 on actual dyno. But not bad.

For shits and giggles. I switched the VD from above to dynojet correction. Lol

 

[Waferz]

For shits and giggles. I switched the VD from above to dynojet correction. Lol

Damn!!!

obviously something is wrong with my VD file, it reads lower powered cars nearly spot on, but anything over 5-600 and the numbers don’t seem nearly as close

 

[Moorman]

I've seen claims form a FocusRS tuner that vdyno is grossly inaccurate because they used their dyno run as the log source, and it wasn't even close to what the dyno showed, therefore VD is worthless. Trying to hack the parameters in vdyno to get an accurate result misses the point & design of vdyno though, so it's not really the way to validate it. Not meaning to discredit the effort of Twisted Tuning especially since I agree that vdyno is pretty accurate, just illustrating the like for like comparison would be dyno-on-the-rollers vs VD-on-flat-pavement rather than trying to massage the input parameters in the app to get matching results.

I'm just about to start the process in the Supra, but here's how I validated vdyno when using my FocusRS. Repeatability was key to me, and this sated my skepticism enough to trust vdyno to feed the data junkie within.

First is the dynojet results of stock compared to tuned:

Second is the vdyno version of those same setups, two runs each (opposite directions, same stretch of road):

 

[Waferz]

I've seen claims form a FocusRS tuner that vdyno is grossly inaccurate because they used their dyno run as the log source, and it wasn't even close to what the dyno showed, therefore VD is worthless. Trying to hack the parameters in vdyno to get an accurate result misses the point & design of vdyno though, so it's not really the way to validate it. Not meaning to discredit the effort of Twisted Tuning especially since I agree that vdyno is pretty accurate, just illustrating the like for like comparison would be dyno-on-the-rollers vs VD-on-flat-pavement rather than trying to massage the input parameters in the app to get matching results.

I'm just about to start the process in the Supra, but here's how I validated vdyno when using my FocusRS. Repeatability was key to me, and this sated my skepticism enough to trust vdyno to feed the data junkie within.

First is the dynojet results of stock compared to tuned:

Second is the vdyno version of those same setups, two runs each (opposite directions, same stretch of road):

Hacking up the parameters is necessary to make it accurate with any new platform that doesn’t have a profile and all dynos read differently and will give a different reading day to day. Most tuners adjust their VD settings to closely resemble the dyno they use in house. There is nothing wrong with using this tool if it’s adjusted properly, it’s been used for years in the evo community and gives relatively close results.

 

[Moorman]

Hacking up the parameters is necessary to make it accurate with any new platform that doesn’t have a profile and all dynos read differently and will give a different reading day to day. Most tuners adjust their VD settings to closely resemble the dyno they use in house. There is nothing wrong with using this tool if it’s adjusted properly, it’s been used for years in the evo community and gives relatively close results.

I think we're ultimately saying the same thing...without published aerodynamic figures (Cd & frontal area) there's no way to avoid estimating those profile settings. What I mean by 'hacking', logging while spinning the rollers which skips chassis aero drag altogether and then trying to tweak the profile to make the log produced during that run jive with what the rollers said.

In short, my view:
Dyno chart from rollers = good
Vdyno chart from (flat/level) street = good
Vdyno chart from rollers = bad

I only mean to contribute my effort in validating vdyno as a useful tool since it was brought up in post #293
For me the logs will be taken from a 3rd gear pull for a couple reasons, mostly the speed on public roads, and also the faster we're going the greater the error if our aero estimates are off.

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