Stage 3 MAFterburner Tuning...Street Proven...S4 Friendly...It's Lemmiwinks On Steroids!
12-22-2007, 11:07 PM
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Stage 3 MAFterburner Tuning...Street Proven...S4 Friendly...It's Lemmiwinks On Steroids!
Finally, my (Aggressive - inside joke for the old skool gang)S4 is Stage 3, including an IPT tranny rebuild to handle the increased power (after a blown torque converter at stage 3-). Going to Stage 3, required a re-tune of my previous MAFterburner maps, that were developed when I was Stage 3-.
As an experiment, I replaced the RS4 intake tube with the ABD 3" racing intake, to see if there was a significant difference in airflow. The ABD Racing intake definitely flows MORE air than the RS4. I found that the MAFterburner maps that I developed with the RS4 installed were TOO LEAN with the ABD Racing intake installed.
<img src="http://pictureposter.audiworld.com/125685/abd_intake2.jpg">
But, that's the nice thing about MAFterburner, it allows me to add fuel at Specific LEAN areas in the AFR curve (via MAF voltage and RPMs). While making adjustments to compensate for the different size intake tubes, I discovered some other things about how MAFterburner influences my S4's AFR. The MAF voltage cells before idle (my S4 idles @ MAF voltage 1.30) and after boost (MAF voltage 4.70 and 4.90) have significant impact on throttle response (like a quick take-off from a stop light) and mid-range torque, even though they NEVER appear in the data logs (as being impacted)when doing a run. Those cells seem to have little impact on the AFR, but in fact, they have a BIG impact on the overall resolution of the curve.
<img src="http://pictureposter.audiworld.com/125685/base_8_-_mafterburner_-_39_deg_-_philly_-_pfuel__-3.71_-_sfuel___114_-_decel__67.2_timing_-0.75__abd.jpg">
To date, with all the MAFterburner tuning that I've done, I've never had more than ONE misfire, and only threw ONE CEL for being too rich. My CFs at 20 psi and an AFR between 11.8 and 12.1 (depending on how I tweak my map) have been above 8 in only two cylinders (4 & 5) and they were 9 and 10 respectively, all the other cylinders were in the 4 - 6 range. Using Lemmi, I pulled timing from 0 to -0.75 and noticed a nice bump up (butt dyno) in torque. My VAG LTFT for the MAFterburner map above is the following:
<img src="http://pictureposter.audiworld.com/125685/vag_ltft_-_base_map_8_-_mafterburner.jpg">
No, I have not taken my S4 to the dyno to check out whether MAFterburner REALLY works, I know it does from real world street experience. Two weeks ago, I was on I495 in Delaware (lots of straight road for 80+ mph runs) and a MB CLS 550 (382 HP, 391 lbs torque)decided to play with me. We were head to head on the straights and continued our race up a bridge, at the top of the bridge, I was able to pull on him and take a 2 car lead on the next straight way that I never gave up. That's enough of a (real world)dyno test of MAFterburner for me.
By the way, I've never had cold start problems or rough idle, and multiple misfires, like many of the home-brew crowd, cause I have more control over my tune than those using ONLY Lemmiwinks. I use Lemmi to control my timing, idle rpm, accel, and decel, that's it. When I want a tune, I use MAFterburner.
Personally, I have no need for a fueling kit from any of the vendors on this board, not that they aren't good, with MAFterburner, I have no need to spend $1500 - $3000 for a fueling kit and a tune. MAFterburer plus my Stage 3 fueling hardware, cost me less than $1000 (USD), the $$$ difference is in my pocket.
For the NOOBs, MAFterburner will enable you to DESTROY your 2.7 bi-turbo engine, if you don't know what you are doing, or have someone who can guide you.
I consider myself pretty experienced with this product now, and I'm still learning new things (about AFR resolution and its impact on performance)with each tuning tweak I make. Like, a jagged AFR curve (like the one above) produces a more aggressive tune than a smooth one, and a curve that has an upward angle after the boost cycle (the green areas - where I'm adding fuel) produces a more aggressive tune than a more linear one.
As an experiment, I replaced the RS4 intake tube with the ABD 3" racing intake, to see if there was a significant difference in airflow. The ABD Racing intake definitely flows MORE air than the RS4. I found that the MAFterburner maps that I developed with the RS4 installed were TOO LEAN with the ABD Racing intake installed.
<img src="http://pictureposter.audiworld.com/125685/abd_intake2.jpg">
But, that's the nice thing about MAFterburner, it allows me to add fuel at Specific LEAN areas in the AFR curve (via MAF voltage and RPMs). While making adjustments to compensate for the different size intake tubes, I discovered some other things about how MAFterburner influences my S4's AFR. The MAF voltage cells before idle (my S4 idles @ MAF voltage 1.30) and after boost (MAF voltage 4.70 and 4.90) have significant impact on throttle response (like a quick take-off from a stop light) and mid-range torque, even though they NEVER appear in the data logs (as being impacted)when doing a run. Those cells seem to have little impact on the AFR, but in fact, they have a BIG impact on the overall resolution of the curve.
<img src="http://pictureposter.audiworld.com/125685/base_8_-_mafterburner_-_39_deg_-_philly_-_pfuel__-3.71_-_sfuel___114_-_decel__67.2_timing_-0.75__abd.jpg">
To date, with all the MAFterburner tuning that I've done, I've never had more than ONE misfire, and only threw ONE CEL for being too rich. My CFs at 20 psi and an AFR between 11.8 and 12.1 (depending on how I tweak my map) have been above 8 in only two cylinders (4 & 5) and they were 9 and 10 respectively, all the other cylinders were in the 4 - 6 range. Using Lemmi, I pulled timing from 0 to -0.75 and noticed a nice bump up (butt dyno) in torque. My VAG LTFT for the MAFterburner map above is the following:
<img src="http://pictureposter.audiworld.com/125685/vag_ltft_-_base_map_8_-_mafterburner.jpg">
No, I have not taken my S4 to the dyno to check out whether MAFterburner REALLY works, I know it does from real world street experience. Two weeks ago, I was on I495 in Delaware (lots of straight road for 80+ mph runs) and a MB CLS 550 (382 HP, 391 lbs torque)decided to play with me. We were head to head on the straights and continued our race up a bridge, at the top of the bridge, I was able to pull on him and take a 2 car lead on the next straight way that I never gave up. That's enough of a (real world)dyno test of MAFterburner for me.
By the way, I've never had cold start problems or rough idle, and multiple misfires, like many of the home-brew crowd, cause I have more control over my tune than those using ONLY Lemmiwinks. I use Lemmi to control my timing, idle rpm, accel, and decel, that's it. When I want a tune, I use MAFterburner.
Personally, I have no need for a fueling kit from any of the vendors on this board, not that they aren't good, with MAFterburner, I have no need to spend $1500 - $3000 for a fueling kit and a tune. MAFterburer plus my Stage 3 fueling hardware, cost me less than $1000 (USD), the $$$ difference is in my pocket.
For the NOOBs, MAFterburner will enable you to DESTROY your 2.7 bi-turbo engine, if you don't know what you are doing, or have someone who can guide you.
I consider myself pretty experienced with this product now, and I'm still learning new things (about AFR resolution and its impact on performance)with each tuning tweak I make. Like, a jagged AFR curve (like the one above) produces a more aggressive tune than a smooth one, and a curve that has an upward angle after the boost cycle (the green areas - where I'm adding fuel) produces a more aggressive tune than a more linear one.
12-23-2007, 07:36 AM
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Re: Off topic. hows ipt treating you? ive had serious issues with their torque converter.
second that I would like to know also, i am going to go stage 3 soon with mine when teh founds allow me to,
thanks
thanks
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12-23-2007, 10:34 PM
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Crossing Fingers - So Far - So Good - IPT Did Fvck Up My Heat Shield & 3 of My 02 Sensors!
So, I filed a dispute with my CC Company for approximately $660 to recover the ADDITIONAL repair bill (by another shop that is VERY familiar with Audis and my S4) after IPT fvcked it up during the tranny re-install.
12-23-2007, 10:47 PM
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In My Opinion IPT Is NOT As Knowledgeable About S4s As Everyone Here Gives Them Credit For!
In fact, they acknowledged that mine was one of the few S4 rebuilds they have done. IPT is very familiar with automatic trannys, especially on jap and american cars, I'm paraphrasing what THEY told me.
In fact, they put some Subaru parts in my ZF Slushbox as a protoype, supposedly to help minimize slippage under load better than the ZF stuff.
Truth be told, there aren't many shops in North America that work on ZF trannys, so you are venturing into unsettled waters with little navigation aids when you do a Stage 3 Tranny upgrade.
Bottom line, when my tranny blew (TC), it was either junk the S4 (and my investment $$$ in it), or rebuild the sucker ($5,700 USD) and get a few more years and miles (already have 137k mi)under Stage 3 power.
In fact, they put some Subaru parts in my ZF Slushbox as a protoype, supposedly to help minimize slippage under load better than the ZF stuff.
Truth be told, there aren't many shops in North America that work on ZF trannys, so you are venturing into unsettled waters with little navigation aids when you do a Stage 3 Tranny upgrade.
Bottom line, when my tranny blew (TC), it was either junk the S4 (and my investment $$$ in it), or rebuild the sucker ($5,700 USD) and get a few more years and miles (already have 137k mi)under Stage 3 power.
