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Join Date: May 2001
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More kudos for Steve W and dyno sheets

Dyno'd my car today with a custom chip from Steve W. As expected it worked great. In addition to some WOT performance gains, what doesn't show on the chart is overall driveability. Car runs as smooth or better in all rpms as it did with the stock air meter. Cold start, idle, everything is perfect.
Thanks Steve. Great Job!

Also, here are some dyno sheets from different engine configs, stock to today. Posted more for future searches than debate. They give some rough estimates on HP/TQ gains from stock. Internally the motor is a stock 3.2L, G50 tranny, any mods are listed on the dyno sheets.



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Don
Looking for a 993
1987 911 - Sold
2013 991 - Sold
2015 Audi Q5, 2015 Golf TDI
Old 07-16-2005, 10:43 PM
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Don:
What AFR readings did you get after installing the Autothority MAF? I've heard it's hard to tune them for correct AFR.
j.p.
Old 07-17-2005, 12:43 AM
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j.p.
The Autothority chip ran really rich. Proper A/F was my main reason with getting a custom chip from Steve W.
I've read where the MAF's are hard to tune. Unless mine is one of the lucky ones, I disagree. Mine was pretty much plug and play. I had some of my own wiring issues but once I got all the wires hooked up, I set the MAF to the factory ohm reading of 2800 and it ran great. Even with the stock chip, it ran pretty good, just too rich. With Steve's chip, it runs great at all rpms.
Here are the A/F charts comparing the HP/AF, Steve W chip vs the std Autothority chip.
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Don
Looking for a 993
1987 911 - Sold
2013 991 - Sold
2015 Audi Q5, 2015 Golf TDI
Old 07-17-2005, 07:58 AM
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I've logged over 100k miles on my Autothority MAF. Only replaced the potentiameter and that was four years ago. Mine too ran rich for a while. The shop I use leaned it up a bit and runs fine. I did send the chip back to Autothority once for calibrating it for Houston's hot summers which they did for free. Even though I've been pleased with them I'll talk to Steve Wong about a new chip after I do some other upgrades.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not.
2012 BMW 528i (wife's)
2007 Toyota FJ (rain and off road days)
Old 07-17-2005, 10:24 AM
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Tom,
How did the shop lean it out? I know you can adjust the potentiameter but I thought that only adjusted the idle mixture.
Also, did your potentiameter go bad? If so, what were the symptoms?
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Don
Looking for a 993
1987 911 - Sold
2013 991 - Sold
2015 Audi Q5, 2015 Golf TDI
Old 07-17-2005, 12:19 PM
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Thanks Don, that is some great empirical data detailing the results that can be expected from chip and exhaust mods.

I have seen all these MAF setups run way too rich, with a remap typically providing the shown changes. MAF is a little more difficult to map because the MAF sensors were individually hand made and curved, and no two meter the same. You can take two different meters, and swap them back and forth on the same car and typically see differences of 1 to 2 afr points. So custom mapping each car with dyno data is the only way to guarantee results and reliability.

As a perfectionist, the current results, although great, could a bit better. The second chip iteration should have a perfectly flat afr curve from leaning it out a bit in the midrange and smoothing out the top end. Not a significant amount more power to be gained (~2hp overall) just smoother power delivery.
Old 07-17-2005, 02:40 PM
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Steve,

Please....think v-ram...v-ram...v-ram. Customers are waiting...at least one!

Best,
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Old 07-17-2005, 03:42 PM
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Mike, I do chip the 55 pin Euro 993 V-ram motors, awesome results.
Old 07-17-2005, 04:50 PM
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Steve:
Have you ventured into the Ferrari 360 ECUs??
j.p.
Old 07-17-2005, 05:00 PM
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Don first, If I recall (this was 5 or so years ago and I am a senior) we adjusted DME box under the seat. Turned the set screw bak a notch or two.

Steve second, do you make a chip for the 1993 RS America. A friend has one and asked.

Sorry to derail the thread Don.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not.
2012 BMW 528i (wife's)
2007 Toyota FJ (rain and off road days)
Old 07-17-2005, 05:17 PM
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JP, drop off that 360 and I'll get back to you after a few months.

For the 964s, and the RSs, yes - just have you or your friend email or contact me.
Old 07-17-2005, 06:54 PM
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Thanks Steve. We'll call late this week. And when you're near completion on modifying the Ferrari let me know so I can come out and help test it.
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1987 911 Guards Red Targa, nearing 200,000 miles, lowered, 7's & 8's, 964 grind cams from John Dougherty, A.P.E. Mass Flow Sensor with chip to match, cat bypass, strut brace, dual out muffler. Will consider newer model in 8 years when I turn 75 and then maybe not.
2012 BMW 528i (wife's)
2007 Toyota FJ (rain and off road days)
Old 07-17-2005, 07:46 PM
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