Power FC Bringing it Back: Almost Ready to Tune
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Bringing it Back: Almost Ready to Tune
Gents,
I have a 1993 MB touring that I purchased from Ebay back in 2010 - have been slowly removing/replacing/fabricating since then to build a reliable street/track toy. Car has a PFS rebuild with 3mm seals, likely a small port, and an Rx6 single kit with my custom v-mount. Started her for the first time in 18 months yesterday - fired up and ran, idled a bit rough (chasing a vacuum leak I think). Managment is via PFC with datalogit - using the PFC base map right now, waiting for my wideband to come in the mail this week for some tuning. I'm starting from zero but have learned a bit through the helpful docs on this site and others. I've tweaked the base tune a bit based on my research to date - changed a few of the specs as per Wargasm's article from 2004 and then increased the split to +2 in the non-boosted areas and retarded to a max leading of 41 across the map (for smoother lift off throttle at high RPM as per a friend).
Was wondering if the gurus could take a look at my tweaked PFC data file (attached) and comment: I'm hoping to use the PFC to control the Apexi wastegate via Apexi solenoid (car had an AVC-R which was conveniently stolen the day that I was to pick it up). Thinking that I can do this at approx 1 bar via boost control setting of 1.0 on settings tab 1 ? Planning to seriously richen the mixture (30-40%?) at 22000 (approx 17.6 psi) so the 14.7psi+ range will act as safeguard in an overboost situation instead of fuel cut. Since I'm running the factory MAP which maxes at 17psi, I'm expecting that I wont hit the PFC fuel cut (1.0 bar + 0.25 bar = 18.3 psi). My rationale is that if I lost wastegate control or something and overboosted, the result would just be an engine bog due to too much fuel.
Thanks,
Aaron
I have a 1993 MB touring that I purchased from Ebay back in 2010 - have been slowly removing/replacing/fabricating since then to build a reliable street/track toy. Car has a PFS rebuild with 3mm seals, likely a small port, and an Rx6 single kit with my custom v-mount. Started her for the first time in 18 months yesterday - fired up and ran, idled a bit rough (chasing a vacuum leak I think). Managment is via PFC with datalogit - using the PFC base map right now, waiting for my wideband to come in the mail this week for some tuning. I'm starting from zero but have learned a bit through the helpful docs on this site and others. I've tweaked the base tune a bit based on my research to date - changed a few of the specs as per Wargasm's article from 2004 and then increased the split to +2 in the non-boosted areas and retarded to a max leading of 41 across the map (for smoother lift off throttle at high RPM as per a friend).
Was wondering if the gurus could take a look at my tweaked PFC data file (attached) and comment: I'm hoping to use the PFC to control the Apexi wastegate via Apexi solenoid (car had an AVC-R which was conveniently stolen the day that I was to pick it up). Thinking that I can do this at approx 1 bar via boost control setting of 1.0 on settings tab 1 ? Planning to seriously richen the mixture (30-40%?) at 22000 (approx 17.6 psi) so the 14.7psi+ range will act as safeguard in an overboost situation instead of fuel cut. Since I'm running the factory MAP which maxes at 17psi, I'm expecting that I wont hit the PFC fuel cut (1.0 bar + 0.25 bar = 18.3 psi). My rationale is that if I lost wastegate control or something and overboosted, the result would just be an engine bog due to too much fuel.
Thanks,
Aaron
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Gents,
I have a 1993 MB touring that I purchased from Ebay back in 2010 - have been slowly removing/replacing/fabricating since then to build a reliable street/track toy. Car has a PFS rebuild with 3mm seals, likely a small port, and an Rx6 single kit with my custom v-mount. Started her for the first time in 18 months yesterday - fired up and ran, idled a bit rough (chasing a vacuum leak I think). Management is via PFC with datalogit - using the PFC base map right now, waiting for my wideband to come in the mail this week for some tuning.
I have a 1993 MB touring that I purchased from Ebay back in 2010 - have been slowly removing/replacing/fabricating since then to build a reliable street/track toy. Car has a PFS rebuild with 3mm seals, likely a small port, and an Rx6 single kit with my custom v-mount. Started her for the first time in 18 months yesterday - fired up and ran, idled a bit rough (chasing a vacuum leak I think). Management is via PFC with datalogit - using the PFC base map right now, waiting for my wideband to come in the mail this week for some tuning.
I'm starting from zero but have learned a bit through the helpful docs on this site and others. I've tweaked the base tune a bit based on my research to date - changed a few of the specs as per Wargasm's article from 2004 and then increased the split to +2 in the non-boosted areas and retarded to a max leading of 41 across the map (for smoother lift off throttle at high RPM as per a friend).
Was wondering if the gurus could take a look at my tweaked PFC data file (attached) and comment: I'm hoping to use the PFC to control the Apexi wastegate via Apexi solenoid (car had an AVC-R which was conveniently stolen the day that I was to pick it up). Thinking that I can do this at approx 1 bar via boost control setting of 1.0 on settings tab 1 ?
https://www.rx7club.com/single-turbo...ontrol-900599/
Planning to seriously richen the mixture (30-40%?) at 22000 (approx 17.6 psi) so the 14.7psi+ range will act as safeguard in an overboost situation instead of fuel cut. Since I'm running the factory MAP which maxes at 17psi, I'm expecting that I wont hit the PFC fuel cut (1.0 bar + 0.25 bar = 18.3 psi). My rationale is that if I lost wastegate control or something and overboosted, the result would just be an engine bog due to too much fuel.
Thanks,
Aaron[/QUOTE]
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Thanks Raymond for the info - I'll change the turbo control settings and then start logging some data (got my wideband installed last night).
Before I jump right to tuning though, I'm still sorting out and idling and driveability issues:
Car wants to idle at 1600 rpm+ even when fully warm. Only way that I can drop the idle towards 900/1000 is to actually grab the throttle plates and manually twist them a back towards closed (they dont move perceptibly, but the idle drops). Mixture screw is 1/8 turn from full in, and idle screw is backed out so it's not touching. When I tap the throttle, it returns to the high idle. Secondly, if I touch the throttle, it immediate bogs (will die if i do more than toe it). If i'm gentle with the throtte application, it will then rev in response normally after about a .5 second lag. Any thoughts? I've adjusted some of the accel. pump type settings as per wargasms PFC tuning guide...They didn't seem to make any difference with this issue. I also tried an old stock twins map from Brian Cain with zero split timing in vaccuum. That didn't help either.
Thanks in advance,
Aaron
Before I jump right to tuning though, I'm still sorting out and idling and driveability issues:
Car wants to idle at 1600 rpm+ even when fully warm. Only way that I can drop the idle towards 900/1000 is to actually grab the throttle plates and manually twist them a back towards closed (they dont move perceptibly, but the idle drops). Mixture screw is 1/8 turn from full in, and idle screw is backed out so it's not touching. When I tap the throttle, it returns to the high idle. Secondly, if I touch the throttle, it immediate bogs (will die if i do more than toe it). If i'm gentle with the throtte application, it will then rev in response normally after about a .5 second lag. Any thoughts? I've adjusted some of the accel. pump type settings as per wargasms PFC tuning guide...They didn't seem to make any difference with this issue. I also tried an old stock twins map from Brian Cain with zero split timing in vaccuum. That didn't help either.
Thanks in advance,
Aaron
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