Tuning Guide

[hakcenter]

So to first start out, you need the right sensors and a good understanding of what you have under the hood. If you ask me why doesn't my car work, I'm going to ask what you have first.

• If you have a wideband run it IN THE STOCK LOCATION or atleast infront of your flex section in the downpipe. It is obsurd for anyone to think that about that old wives tale 'overheat' bologna. It is safe, and you will get the best results.
• OPENLOOP. You cannot tune fast, and reliably if your not taking things out of the tuning equation. Open your ECU binary image, look for the CL TPS Table, and make it 0.0% across the row. (CL TPS is the amount of % tps value to go into closed loop, depending on the rpm column.)
• FLATTEN OUT YOUR FUEL TABLE. A lot of people really miss this, if you want to look between logs and your fuel table, fine. But if you want to tune about 5 years faster, flatten out the entire table. Below boost, 13.0 is a great starting point, its a little rich, but generally you will get less misfires, and a quicker pre-boost tune on 13.0. Post boost, do not step the AFR, flat is again, very key here, and 11.0 is fine, I usually go there on low power cars, 10.5 - 10.8 on high power cars.
• That means, from load rows 1 to 6, make it 13.0, or whatever AFR you want. So you can tune the off boost of your car for 13.0. Make load rows 7 to 12 your WOT AFR you want 10.5 or 11.0.
• Warm your car up, there's nothing more usless than a cold motor WOT log. SERIOUSLY wait till its 206*F
• Start basic! Idling the car, adjust your VE Comp in large increments if your AFR is off by atleast 1 point, (pageup / pagedown are 16 increments of + or -).
• VE should rarely be adjusted, VE Comp is the #1 first adjustment unless the VE is really out of whack. You can tell if the VE is off IF: your vacuum is the same from 1000rpm to 2000rpm, and the AFR is off. So as an example, only adjust VE when you have the same vacuum/bar at different rpms and the AFRS are off.
• Gradually step your motor free rev, through 1k to 4k, picking rpm points that are between the VE table breaks. 750rpm for the 1000rpm table, 1250rpm for the 1500 table, 2250rpm for the 2500rpm table, etc. USE THE LOGGER RPM NOT YOUR TACH.
• Once you seem to have the absolute basics, within atleast half a point afr. It is time to drive it. Log RPM, O2, MAP, TPS, IAT (for WOT runs) and VSS is nice to atleast know if the car is moving. Anything less than these sensors, is not going to give you or the rest of us the information needed to make accurate adjustments to your VE.

I'll definatly make an advanced tuning thread, using peoples logs and images to show the needed changes and the why's.

[hakcenter]

I'll be adding to this guide as it goes along, but without the assistance text for now.

91 Octane 10.5 MAX AFR, never gunna make power any leaner on a big setup.
93 Octane 11:1 - 11.5:1 on small setups, 10.5:1 on big setups
E85 go for timing 16-22 first, then lean it out.

No matter what fuel type you ever use. Always max out your timing first before you attempt to lean out for more power. This mean if you gain 4* of timing @ 10.5:1 and still don't knock but you want to run 11:1, keep adding timing first. You will make more power with timing than lean setups. It is SAFER adjusting timing in comparison to AFRs on bigger setups as well.

WOT

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rpm mph tps knock map afr
1093 21 014 0 0.95 16.73
1156 20 100 0 0.99 11.7
1218 25 100 0 1.00 11.29
1312 25 100 0 1.03 11.18
1406 29 100 0 1.03 11.18
1468 26 100 0 1.04 11.12
1562 31 100 0 1.06 11.35
1656 29 100 0 1.09 11.41
1750 38 100 0 1.09 11.47
1843 31 100 0 1.11 11.47
1968 38 100 0 1.11 11.35
2062 43 100 0 1.11 11.06
2250 43 100 0 1.12 10.84
2343 50 100 0 1.15 10.67
2437 43 100 0 1.17 10.38
2562 58 100 0 1.22 10.27

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rpm mph tps knock map afr
2687 50 100 0 1.28 10.5
2812 58 100 0 1.34 10.61
3000 58 100 0 1.40 10.78
3156 58 100 0 1.43 10.67
3312 70 100 0 1.43 10.55
3406 70 100 0 1.43 10.5
3562 70 100 0 1.43 10.32
3687 87 100 0 1.43 10.09
3781 70 100 0 1.45 10.03
3906 70 100 0 1.43 9.98
3937 70 007 0 0.21 13.41The 2687rpm and down is ECU load row 9.01+, which is a target AFR of 10.96:1, above that run, is 11.84:1 (not helpfull for this tuning run), flat fuel tables really help tuning.

Notice that every 500 rpms from the red up, the AFR is not close at all. The RPM columns on the VE need to be adjusted, and the overal Comp VE needs to go down because the AFR is off by atleast a point, to half point in most areas.

Subtract VE
2500rpm column by 4points (currently 91.0 make it 87.0)
Subtract VE
3500rpm column by 8points (currently 90.0 make it 82.0)
Subtract VE
4000rpm column by 12points (currently 102.0 make it 90.0)
Probably subtract 12 from 4000rpm column and up.

Subtract Comp VE
1.17 and up, subtract 4% (currently 124.2% make it 120.3%)