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VersaTune's Shop Car Tuning Journey

Old 01-28-2019, 05:39 PM
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Those of us with D585 coils will appreciate this.
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Old 02-03-2019, 03:43 AM
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The Racing Beat REVi intake is installed.

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Old 02-03-2019, 04:26 AM
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Here is the dyno sheet - Racing Beat REVi intake stock tune vs. VersaTuner 6-port: 93US/98EU Octane Stage 1 RX-8 with REVi Intake v1.01 tune
The gains from the tune are not as good as on a 100% stock car due to the baseline with the REVi intake and the stock tune being higher. The REVi intake skews the MAF, leaning the mixture which results in more power with a stock tune.
Logged max mass air flow with the REVi intake was 5% less than the stock airbox, yet power was up compared to the stock airbox. This and the logs showing leaner AFRs with the REVi intake confirms that the MAF is skewed.
This is how most cold air intakes provide power increases on stock cars; increase the diameter of the maf housing slightly to skew the MAF reading down so the AFRs lean out and the ECU sees lower load.

With the amount of engineering that went into the stock RX-8 airbox, there is not much airflow to be gained with aftermarket intakes. The stock airbox uses the same panel filter as a 645hp V-10 Dodge Viper....

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Old 02-05-2019, 12:11 PM
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Steve,

Delayed Response. But, I have run across 3 motors, all modified, but 3 for 3, where the top of the Calculated Load line hit the Max Calculated Load line around 6,000 RPM. This triggers a fuel cut until Calculated Load falls below Max Calculated Load. One had issues all the way to 7,000 PRM. The only change was to move the Max Calculated Load line up and his issues went away instantly. I have seen Calc Load hit 119%, below 6K, if the Max Calc Load line is below this, it will fuel cut to whatever was there when it crossed the line. IIRC the Max like is around 100%, so the bad area was about a 20% fuel cut (bad).

Kind of what they are talking about here..
https://www.rx8club.com/series-i-eng...engine-217479/
Which I wish I had seen before I started.

Just sharing.
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Old 02-05-2019, 02:39 PM
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Originally Posted by NotAPreppie View Post
Those of us with D585 coils will appreciate this.
didn't he say it had new oem coils? I'm unsure of what you mean about it helping for d585 coils.

I've been running the dwell table thats been posted in the d585 dwell thread and have had no issues
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Old 02-05-2019, 03:02 PM
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It will make it easier because it will be in human-readable numbers so you don't have to do any conversion in your head or trust some other person's conversion.
Figure out how long you want the dwell to be (I'm guessing in milliseconds) and then type that number in.
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Old 02-05-2019, 03:17 PM
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Originally Posted by 04Green View Post
Steve,

Delayed Response. But, I have run across 3 motors, all modified, but 3 for 3, where the top of the Calculated Load line hit the Max Calculated Load line around 6,000 RPM. This triggers a fuel cut until Calculated Load falls below Max Calculated Load. One had issues all the way to 7,000 PRM. The only change was to move the Max Calculated Load line up and his issues went away instantly. I have seen Calc Load hit 119%, below 6K, if the Max Calc Load line is below this, it will fuel cut to whatever was there when it crossed the line. IIRC the Max like is around 100%, so the bad area was about a 20% fuel cut (bad).

Kind of what they are talking about here..
https://www.rx8club.com/series-i-eng...engine-217479/
Which I wish I had seen before I started.

Just sharing.
And here .

https://www.rx8club.com/series-i-eng...erride-248857/
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Old 02-06-2019, 12:12 AM
  #58  
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Originally Posted by 04Green View Post
Steve,

Delayed Response. But, I have run across 3 motors, all modified, but 3 for 3, where the top of the Calculated Load line hit the Max Calculated Load line around 6,000 RPM. This triggers a fuel cut until Calculated Load falls below Max Calculated Load. One had issues all the way to 7,000 PRM. The only change was to move the Max Calculated Load line up and his issues went away instantly. I have seen Calc Load hit 119%, below 6K, if the Max Calc Load line is below this, it will fuel cut to whatever was there when it crossed the line. IIRC the Max like is around 100%, so the bad area was about a 20% fuel cut (bad).

Kind of what they are talking about here..
https://www.rx8club.com/series-i-eng...engine-217479/
Which I wish I had seen before I started.

Just sharing.
My understanding is that this is a sanity limit for calc load, so that if the MAF gets wet or flakes out somehow, it doesn't dump fuel based on some erroneous load calc. For the stock hardware tunes, I push this up to 1.1. On the latest CAI tune, I pushed it up to 1.2 even though the REVi actually skewed the MAF down. Other CAIs may go in the other direction, and people tend to use off-the-shelf tunes generically for similar hardware.
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