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VersaTune's Shop Car Tuning Journey

Old 01-05-2019, 05:19 PM
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VersaTune's Shop Car Tuning Journey

I thought I'd start a new thread to journal the progress of our shop car. Enjoy the ride as we move from stock to lightly modified to all-out turbo performance. We will build tunes and add them to our tuning database as we go, making it easy for others to replicate our results.

Our shop car is a 2004 RX-8 with just under 90,000 miles on the chassis. The engine is a Mazda reman engine with less than 10,000 miles on it.

On the dyno for the first time.


The dyno results - as purchased 100% stock and unmodified.


Last edited by [email protected]; 01-14-2019 at 09:00 AM.
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Old 01-05-2019, 05:25 PM
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Our first step is to establish a healthy stock baseline. In the first dyno, I noticed some jitter at high RPMs which lead me to believe that there was something not quite right with the ignition. So, we ordered a fresh set of stock coils and NGK plugs and wires.
The new ignition parts are in. Here are the old ones. Note the hot spots on the coils.


A new stock replacement air filter is on order as well. The mfg date on this one is 2012.

Last edited by [email protected]; 01-05-2019 at 10:35 PM.
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Old 01-05-2019, 10:20 PM
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This is a cool idea, but why are the images so small? I cant view the dyno results at all in the first post. Im curious what the stock car made.
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Old 01-05-2019, 10:32 PM
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challenges with posting images. Fixed

Last edited by [email protected]; 01-05-2019 at 10:35 PM.
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Old 01-06-2019, 05:48 AM
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wow,

this is best, needed thread for elders thinking about it.

shameless bump

beers
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Old 01-06-2019, 11:30 PM
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Originally Posted by [email protected] View Post
challenges with posting images. Fixed
These images are much better, but the dyno chart seems to be missing now? Can you post it again or at least let us know the numbers the stock car made?
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Old 01-06-2019, 11:37 PM
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Try refreshing the page. The dyno is there for me.

Wheel Torque T (Ft-Lbs) 120 @ 5651 RPM
Wheel Power T (HP) 170 @ 8170 RPM

Compression tester is on the way too.
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Old 01-07-2019, 07:11 PM
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Originally Posted by [email protected] View Post
Try refreshing the page. The dyno is there for me.

Wheel Torque T (Ft-Lbs) 120 @ 5651 RPM
Wheel Power T (HP) 170 @ 8170 RPM

Compression tester is on the way too.

Will you be retesting after putting the new coils and filter in and before any tuning?

Last edited by TomD_Cincy; 01-07-2019 at 07:14 PM. Reason: changed comment
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Old 01-07-2019, 07:29 PM
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Yes
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Old 01-08-2019, 07:37 AM
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any plans on tuning on E85 or add more tables to versatner to support E85?
thanks,
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Old 01-08-2019, 07:40 AM
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Steve,

Thanks for doing all of this! It's something I've really wanted to do but lack access to a dyno.

Signed,
Every '8 owner ever, whether they know it or not.
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Old 01-12-2019, 03:59 PM
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Originally Posted by trackjunkie View Post
any plans on tuning on E85 or add more tables to versatner to support E85?
thanks,
We'll probably do E85.
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Old 01-12-2019, 04:03 PM
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The stock tune-up is done.
We installed new stock replacement plugs, wires, coils, and air filter. It felt smoother after the tune-up. I thought it was placebo effect until I saw the dyno. +9HP!

Here is the dyno:



Last edited by [email protected]; 01-17-2019 at 08:22 AM. Reason: corrected dyno sheet showing tune-up plot vs baseline with positive gains.
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Old 01-12-2019, 04:11 PM
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Good work ... IMO too much comparison is done, when fitting aftermarket parts, with old worn out stock parts ...............
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Old 01-12-2019, 04:17 PM
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Thanks. I'm trying to make this as repeatable as possible.
I wanted to create a healthy stock baseline to use for comparison. I have a rotary compression tester, but the lift was busy today. I'll do a compression test soon.

The VersaTuner performance tune for a 100% stock car is coming soon!
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Old 01-14-2019, 08:53 AM
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Steve,

Can you repost the second dyno chart after the coil change? Its very small.

Thanks much for doing these progressive tests. It is very helpful.
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Old 01-14-2019, 08:54 AM
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Fixed.

Last edited by [email protected]; 01-14-2019 at 09:01 AM.
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Old 01-15-2019, 11:10 PM
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We ran a half a tank of fuel through the RX-8 on the dyno last night doing dozens of dyno pulls. We confirmed a lot of RX-8 tuning beliefs. Timing doesn't really do much on stock RX-8s. Leaner AFRs make some power, but you need to keep the health of the catalytic converter in mind and not get too crazy. Rotaries have high EGTs! More to come as we continue development of the RX-8 tunes.
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Old 01-16-2019, 12:28 AM
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I have a question, as well as a potential additional test you could perform.

Question: Are you using a premix on this motor? If so, what oil and to what ratio; and if not, why not?

Test: Does premixing your fuel affect horsepower/output. Its generally accepted that premixing has an affect on octane amongst other fuel characteristics, however the benefits of premixing are also well known and generally accepted as a beneficial habit. It would be interesting to have a comparison using healthy motor where any differences may have a more noticable difference (as a percentage decrease, or possibly percentage increase, who knows)

Good luck,
Ricky
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Old 01-16-2019, 06:44 AM
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We have not tested with pre-mixing yet. We have not experienced any knock with stock or advanced timing. We can test pre-mixing to see if there is any difference.
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Old 01-16-2019, 07:32 AM
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Great Idea, Following...

Am also interested in the Pre-Mix concepts. Butt Dyno says yes, including a different exhaust note. Then factor in the F1 "Oil Leak" scandal...

One question, and no problem discussing off line, but do you have an idea of how close you % Load line is to your Calculated Max Load Line? Specifically around 6,000 RPM on a Stock Motor?
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Old 01-16-2019, 08:15 AM
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The max load I've seen is 1.07 at 5900 with ECT 73C and IAT 20C. The engine was still a little on the cool side. Typical peak load is around 1.035 with normal ECT and room temperature IATs.
I don't log percent of max calc load. It's an arbitrary value.
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Old 01-17-2019, 08:19 AM
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Here is the dyno sheet for our new tune for a 100% stock RX-8. The tune will be in the tune database later today.



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Old 01-17-2019, 09:29 AM
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Looks like you changed the APV and VDI timing to open a little later.
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Old 01-17-2019, 09:30 AM
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Originally Posted by NotAPreppie View Post
Looks like you changed the APV and VDI timing to open a little later.
I didn't move the APV, just the VDI. I tried moving the APV around, it didn't help.
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