Virtual Dyno Day!

[skyshadow07]

My best bet on why it was so messed up is because I used a HP tuners log

 

[FiveLeeter918]

My best bet on why it was so messed up is because I used a HP tuners log

Just export it to Excel, crop out everything but TIME, RPM, BOOST, AFR, and THROTTLE. Remove all the heading information from the file and save it, crop the file down to JUST the pull nothing extraneous, and then open VD and go to Options -> Columns and headings and force it to look for those items. Then load the file in and make sure gearing matches.

 

[skyshadow07]

I'll try that.

 

[802SHO]

Not sure what that blip is at beginning of run.View attachment 15060

Try smoothing setting 3. It makes the graph smoother and you lose some power number wise but I noticed lee used 3 so I did too.

 

[ridered74]

Try smoothing setting 3. It makes the graph smoother and you lose some power number wise but I noticed lee used 3 so I did too.

Lowered the torque a bit but the graph looks pretty much the same. If I put smoothing at 0 my torque goes up to 781 ft/lbs. All the powah!

 

[802SHO]

Lowered the torque a bit but the graph looks pretty much the same. If I put smoothing at 0 my torque goes up to 781 ft/lbs. All the powah!

It’s definitely fun to mess with it

 

[802SHO]

According to virtual dyno.............after adding the phenolic spacer and nothing else changed on same tune and same road......I lost 75awhp and 44 awtq! Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

 

[Ecoboost_xsport]

According to virtual dyno.............after adding the phenolic spacer and nothing else changed on same tune and same road......I lost 75awhp and 44 awtq! HmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmView attachment 15116View attachment 15117

Hmmm these are interesting results...

Able to get more data? Don't have mine on yet, but if others who have it can get some logs to corroborate. I'm wondering if a tune revision is needed. Lots of work, sure, but maybe pull it off and do another run to verify? Also, not sure how much it would effect it, but it's got a very sloppy fit due to the IM bolt holes so large and alignment may be interrupting flow? I've got the alignment dowels that may facilitate this. Idk just throwin stuff out there to think about.

I just can't see how this small 3/8" spacer could effect it that bad (or even improve power, tbh), I was intending on using it as another step in heat soak mitigation.

Another issue I have is really with Virtual Dyno. It just changes too drastically with even very small variables or adjustments. I could never get anything reliable out of it so I kinda gave up on it.

Good info though and we should all look into this a bit more.

 

[802SHO]

Hmmm these are interesting results...

Able to get more data? Don't have mine on yet, but if others who have it can get some logs to corroborate. I'm wondering if a tune revision is needed. Lots of work, sure, but maybe pull it off and do another run to verify? Also, not sure how much it would effect it, but it's got a very sloppy fit due to the IM bolt holes so large and alignment may be interrupting flow? I've got the alignment dowels that may facilitate this. Idk just throwin stuff out there to think about.

I just can't see how this small 3/8" spacer could effect it that bad (or even improve power, tbh), I was intending on using it as another step in heat soak mitigation.

Another issue I have is really with Virtual Dyno. It just changes too drastically with even very small variables or adjustments. I could never get anything reliable out of it so I kinda gave up on it.

Good info though and we should all look into this a bit more.

I agree about the reliability of virtual dyno. I think it is a great for giving someone a ball park idea about power out put but it is very finicky. All of my last year 19 psi 3rd gear pulls without everything I did this year had me at over 600awtq with smoothing at 3. What I also wanted to state was that otherwise the above pull felt great actually. I was eager to check it with virtual dyno. A Dragy pull would be my next test. Also maybe check the tightness of the bolts.

 

[High on Ethanol]

Id still say airflow #/min is best way to check effectiveness of mods to the engine. As for everything else id say a measured distance run and try to be repeatable with conditions.

 

[Ecoboost_xsport]

I agree about the reliability of virtual dyno. I think it is a great for giving someone a ball park idea about power out put but it is very finicky. All of my last year 19 psi 3rd gear pulls without everything I did this year had me at over 600awtq with smoothing at 3. What I also wanted to state was that otherwise the above pull felt great actually. I was eager to check it with virtual dyno. A Dragy pull would be my next test. Also maybe check the tightness of the bolts.

Yeah, service manual says 89 in-lbs, so it's not that much. Hopefully that doesn't crack that material, either. I still haven't been able to bail down what actual type of material he used, although it looks and feels pretty sturdy.

 

[SM105K]

My logs do that curve back too, and are way down on power.

 

[Ecoboost_xsport]

My logs do that curve back too, and are way down on power.

With the spacer vs not with the spacer?

 

[SM105K]

I don't have the spacer. I was noting my VD dyno logs are curved like Andrew. They are down on power from my actual dyno runs as well. It says I have 341 hp and 420 tq. My dyno runs on numerous days have always said 390 hp and 470 tq. 111 mph @ 4560 lbs is roughly 487 flywheel HP. 487 hp x 23% = 112. 487 - 112 is 375 to the tire.

 

[High on Ethanol]

I don't have the spacer. I was noting my VD dyno logs are curved like Andrew. They are down on power from my actual dyno runs as well. It says I have 341 hp and 420 tq. My dyno runs on numerous days have always said 390 hp and 470 tq. 111 mph @ 4560 lbs is roughly 487 flywheel HP. 487 hp x 23% = 112. 487 - 112 is 375 to the tire.

Do you have any airflow numbers?

 

[SM105K]

Do you have any airflow numbers?

I was actually looking at my logs. I do not monitor the DRM. I will add it. However I can look at the formula that @stripSHO posted and go from there.

 

[High on Ethanol]

I was actually looking at my logs. I do not monitor the DRM. I will add it. However I can look at the formula that @stripSHO posted and go from there.

I think its valuable research for people who don't have access to a dyno.

 

[SM105K]

On my 391/470 dyno run, I pulled up my data log.

Ambient Air Temp: 78 degrees
Fuel: 91 octane mixed with Torco T85 for E30

Load x RPM x .00471

1.62 x 6293 x .00471 = 48.01

 

[ridered74]

I agree about the reliability of virtual dyno. I think it is a great for giving someone a ball park idea about power out put but it is very finicky. All of my last year 19 psi 3rd gear pulls without everything I did this year had me at over 600awtq with smoothing at 3. What I also wanted to state was that otherwise the above pull felt great actually. I was eager to check it with virtual dyno. A Dragy pull would be my next test. Also maybe check the tightness of the bolts.

If you have excel, just compare timestamps from identical mph's between the two tuns, 30-80 or 40-80 or whatever you ran. I've done that numerous times on 1/4 mile runs and it's always within a hundredth of a second of what dragy gives me.

I wouldn't sweat a virtual dyno result.

 

[FiveLeeter918]

On my 391/470 dyno run, I pulled up my data log.

Ambient Air Temp: 78 degrees
Fuel: 91 octane mixed with Torco T85 for E30

Load x RPM x .00471

1.62 x 6293 x .00471 = 48.01

so not too far off, right at 370 with drivetrain loss.