Autothority Turbo S chips
01-21-2003, 05:22 PM
#1
Burning Brakes
Thread Starter
Autothority Turbo S chips
Hey guys,
I've now got a set of Guru Racing chips in my car, which have been custom mapped to match my 52# injectors and bigger turbo. As such, I've got a set of Autothority Stage 2 (ver 2.7) chips and banjo-bolt restrictor jet up for grabs. These chips are designed for '88 TurboS's, and '89+ Turbos. I had great success using these chips, and they provide a significant boost for otherwise stock cars.
Even with my cars extensive modifications, I was able to perfectly dial in my a/f ratios using these chips in conjunction with my ARC2 fuel controller. I have a/f ratio plots from dyno testing to prove it. If you're interested, let me know, or see my listing on ebay.
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2400836152&category=33597" target="_blank">APE Stg2 Chips</a>
I've now got a set of Guru Racing chips in my car, which have been custom mapped to match my 52# injectors and bigger turbo. As such, I've got a set of Autothority Stage 2 (ver 2.7) chips and banjo-bolt restrictor jet up for grabs. These chips are designed for '88 TurboS's, and '89+ Turbos. I had great success using these chips, and they provide a significant boost for otherwise stock cars.
Even with my cars extensive modifications, I was able to perfectly dial in my a/f ratios using these chips in conjunction with my ARC2 fuel controller. I have a/f ratio plots from dyno testing to prove it. If you're interested, let me know, or see my listing on ebay.
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2400836152&category=33597" target="_blank">APE Stg2 Chips</a>
01-21-2003, 08:08 PM
#3
Burning Brakes
Thread Starter
Hi Tecart,
Good point. I've still got some more tuning to do with the wideband O2 sensor, so I'll make a full report once I've got everything setup. Danno is sending me an air temp sensor (the HR MAF doesn't include one), so that still needs to be installed as well.
Initial results - cold idle richness has been solved and mid-range punch is downright violent. If anyone is interested in my APE chips, please note - my cold idle richness was not a function of those chips, it had to do with the Huntley Racing MAF kit with no air-temp correction, and the fact that I was using these chips (designed for a stock Turbo S) on a heavily modded car.
Good point. I've still got some more tuning to do with the wideband O2 sensor, so I'll make a full report once I've got everything setup. Danno is sending me an air temp sensor (the HR MAF doesn't include one), so that still needs to be installed as well.
Initial results - cold idle richness has been solved and mid-range punch is downright violent. If anyone is interested in my APE chips, please note - my cold idle richness was not a function of those chips, it had to do with the Huntley Racing MAF kit with no air-temp correction, and the fact that I was using these chips (designed for a stock Turbo S) on a heavily modded car.
01-22-2003, 04:08 AM
#4
Race Director
Yes, the APE chips are programmed for a stock car using stock chips and stock 2.5L-bar FPR. That's what was causing Ian's too-rich idle when combined with his 3-bar FPR and 52-lb/hr injectors.
Our chips are specifically programmed for a 3-bar FPR. On his chips, I set the 1st aftermarket injector size at 49.3lb/hr instead of our usual 55lb/hr. Thus he's able to get a clean idle with the LOW **** set to zero (12 o'clock) on this ARC2.
With some additional feedback from his WB-O2, I'll fine-tune the chips so that all the ARC2 ***** can be set to zero across the board, thus not skewing the fuel or ignition map look-up point at all. If you think the mid-range is violent now, just wait 'til you try out the race-gas setting... heh, heh... <img border="0" title="" alt="[Wink]" src="wink.gif" /> (I suspect 350rwhp/350lb•ft TQ at the same boost)
Our chips are specifically programmed for a 3-bar FPR. On his chips, I set the 1st aftermarket injector size at 49.3lb/hr instead of our usual 55lb/hr. Thus he's able to get a clean idle with the LOW **** set to zero (12 o'clock) on this ARC2.
With some additional feedback from his WB-O2, I'll fine-tune the chips so that all the ARC2 ***** can be set to zero across the board, thus not skewing the fuel or ignition map look-up point at all. If you think the mid-range is violent now, just wait 'til you try out the race-gas setting... heh, heh... <img border="0" title="" alt="[Wink]" src="wink.gif" /> (I suspect 350rwhp/350lb•ft TQ at the same boost)
01-22-2003, 08:12 AM
#5
Since so many of us are changing to Guru chips there are lot of aftermarket chips available! I have a set of Europroducts chips for '88 non S and Super chips for S (ex Turbo-Tommy's to whom i changed Guru chips last weekend)
Seems to me it's almost imposible to sell these used chips.Everybody wants to have the best ones... <img border="0" title="" alt="[Wink]" src="wink.gif" />
Seems to me it's almost imposible to sell these used chips.Everybody wants to have the best ones... <img border="0" title="" alt="[Wink]" src="wink.gif" />
01-23-2003, 12:25 AM
#6
Instructor
Join Date: Oct 2002
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Danno,
If I have the ability to adjust my fuel with, for example, your digital maf or map are your chips any better then the APE chips. In other words is your timing that much different. I would think that if you have fuel control the only variable would be the timing so I want to know if GURU chips would make any difference at that point over the APE. Also, with the proper set up(fuel and timing) would the car get any more performance with a stand alone?
If I have the ability to adjust my fuel with, for example, your digital maf or map are your chips any better then the APE chips. In other words is your timing that much different. I would think that if you have fuel control the only variable would be the timing so I want to know if GURU chips would make any difference at that point over the APE. Also, with the proper set up(fuel and timing) would the car get any more performance with a stand alone?
01-23-2003, 12:44 AM
#7
Race Director
Using a combination of fuel and ignition, we've arrived at several highly-optimized settings for the 951 that perform significantly better than APE/HR chips with the same MAF/MAP configuration. Several people have commented on upgrading their MAF kits with our chip upgrade, more to follow...
"I would think that if you have fuel control the only variable would be the timing so I want to know if GURU chips would make any difference at that point over the APE. "
Remember that MAF-interceptors and our MAP-sensor does not control fuel. They only adjust the voltage of the air-flow meter signal going to the DME to select a different zone on the chip's maps. As such there are limitations to the adjustments you are allowed to make to the voltage. For example, you cannot dial in a voltage curve with a negative slope somewhere.
I prefer to not have any signal-massaging or look-up point skewing with a MAF/MAP-sensor at all because you're not able to skew fuel & ignition independently in opposite directions, which is what you would need to do in order to get optimum performance. All of our MAP kits are shipped with zero corrections with all the optimizations done in the chips.
"In other words is your timing that much different."
YES! Part of the issue is that the APE chips have dialed in way, way too much ignition advance; in some areas, about 4-5x more than the stock chips (how about 45-degrees BTDC at 2000rpm?). They also retard the ignition as the RPMs increase
... I suspect that all the extra fuel (2-5x more than stock) is a last-ditch effort to combat the detonation and knock that results from such crazy ignition. This extra fuel quenches the combustion and kills power, giving you that trademark APE loping idle and lethargic mid-range. Several people have commented that putting in their stock chips back in make a noticeable improvement in mid-range response.
Compared to the APE chips, ours are actually much, much closer to the stock and TurboCup chips in fuel & ignition mapping. We've removed the low-/mid-range turbo-lag that was present; I suspect added intentionally by someone at Porsche.
Having four (4) user-selectable ignition maps also gives you some versatility. These are the only chips that allow you to advance your ignition settings to take advantage of race-gas.
"Also, with the proper set up(fuel and timing) would the car get any more performance with a stand alone? "
So far, with our tuning of the Link-1 system and closing in on optimum fuel & ignition maps, they are looking suspiciously similar to our chip mappings...
"I would think that if you have fuel control the only variable would be the timing so I want to know if GURU chips would make any difference at that point over the APE. "
Remember that MAF-interceptors and our MAP-sensor does not control fuel. They only adjust the voltage of the air-flow meter signal going to the DME to select a different zone on the chip's maps. As such there are limitations to the adjustments you are allowed to make to the voltage. For example, you cannot dial in a voltage curve with a negative slope somewhere.
I prefer to not have any signal-massaging or look-up point skewing with a MAF/MAP-sensor at all because you're not able to skew fuel & ignition independently in opposite directions, which is what you would need to do in order to get optimum performance. All of our MAP kits are shipped with zero corrections with all the optimizations done in the chips.
"In other words is your timing that much different."
YES! Part of the issue is that the APE chips have dialed in way, way too much ignition advance; in some areas, about 4-5x more than the stock chips (how about 45-degrees BTDC at 2000rpm?). They also retard the ignition as the RPMs increase
... I suspect that all the extra fuel (2-5x more than stock) is a last-ditch effort to combat the detonation and knock that results from such crazy ignition. This extra fuel quenches the combustion and kills power, giving you that trademark APE loping idle and lethargic mid-range. Several people have commented that putting in their stock chips back in make a noticeable improvement in mid-range response.Compared to the APE chips, ours are actually much, much closer to the stock and TurboCup chips in fuel & ignition mapping. We've removed the low-/mid-range turbo-lag that was present; I suspect added intentionally by someone at Porsche.
Having four (4) user-selectable ignition maps also gives you some versatility. These are the only chips that allow you to advance your ignition settings to take advantage of race-gas.
"Also, with the proper set up(fuel and timing) would the car get any more performance with a stand alone? "
So far, with our tuning of the Link-1 system and closing in on optimum fuel & ignition maps, they are looking suspiciously similar to our chip mappings...
Trending Topics
01-23-2003, 02:39 AM
#8
Instructor
Join Date: Oct 2002
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Danno,
My DME went bad so I had to put in a N/A 944 DME and I couldnt believe that my car actually ran better. It was as you described, the mid range was so crisp in particular but the whole powerband range was better. Of course I didnt push it out of fear I would cause serious damage but still I was on it enough to know that the APE chips were doing me wrong. I am sure we will be doing business soon. Your always informative, thanks.
My DME went bad so I had to put in a N/A 944 DME and I couldnt believe that my car actually ran better. It was as you described, the mid range was so crisp in particular but the whole powerband range was better. Of course I didnt push it out of fear I would cause serious damage but still I was on it enough to know that the APE chips were doing me wrong. I am sure we will be doing business soon. Your always informative, thanks.