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#1 |
Scooby Specialist
Member#: 174442
Join Date: Mar 2008
Chapter/Region:
Tri-State
Location: NNJ
Vehicle:2007 SuperWagon I don't spell well |
![]() So I thought, why not make a hybrid economy / performance map where below 70% throttle you're driving a 2.5i and above 70% the car's a sti.
So how would you go about setting that up safely? Obviously zero out WGDCs up to 70% to stay out of boost what about fueling? timing? transition between the two? I haven't done a economy map so this is all new to me.
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#2 |
Scooby Specialist
Member#: 174442
Join Date: Mar 2008
Chapter/Region:
Tri-State
Location: NNJ
Vehicle:2007 SuperWagon I don't spell well |
![]() As far as boost goes. I made a preliminary boost and WGDC map that seems to be working well.
I kept my regular boost targets, but set all WGDCs to 0 below 70. I have the feeling that if I set my target boost map to -9 at less than 70%, negative TDCs would build up. This way TDC stays at 0 until I mash the throttle |
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#3 |
Scooby Specialist
Member#: 174442
Join Date: Mar 2008
Chapter/Region:
Tri-State
Location: NNJ
Vehicle:2007 SuperWagon I don't spell well |
![]() bump for ideas
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#4 |
Scooby Specialist
Member#: 26568
Join Date: Oct 2002
Chapter/Region:
NESIC
Location: Brighton, Mass
Vehicle:2003 Yellow Bugeye Version 8-Vf37 |
![]() even at 0% wastegate duty, you still make whatever boost your spring is pressure is. so factory td04 will be like 8lbs for example. But, i like that your considering making this map
![]() I think you have to play with open/closed loop fueling. try to keep the car in closed loop and leaner while cruising. just an idea i guess, but this can create very hot cylinder temps and knock if your car hits decent boost. |
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#5 | |
Scooby Newbie
Member#: 130063
Join Date: Oct 2006
Location: Ohio
Vehicle:2003 WRX Silb |
![]() Quote:
Here is what I would do. 0 wgdc up to 65% or so. Change your Target CL burn to about 15.2 not a huge change but should squeeze a mpg out. Timing is going to be tricky with out a dyno to make sure your being efficient. Make sure you put your CL OL Delays back in. Tweak Tip in. I was able to get our outback XT from 20 observed to 22 observed and it still runs 16lbs up top. |
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#6 |
Scooby Newbie
Member#: 125552
Join Date: Sep 2006
Chapter/Region:
W. Canada
Location: Winnipeg, Manitoba CANADA
Vehicle:05 legacy 2.5i wag |
![]() has anyone else tried tweaking their map to save gas under normal driving??
i've zero'd target boost and wgdc high up to 49% throttle, changed cl target to 15, increased timing under 1.0load up to 3800rpms (no knock) i've also decreased warm up enrichment |
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#7 |
Scooby Guru
Member#: 36033
Join Date: Apr 2003
Chapter/Region:
SCIC
Location: Tuning Lab
Vehicle:CEO PhatBottiTuning 2006 STi GTX3582 + Meth |
![]() ^ thats pretty much all you can do.
1 more thing is to reduce or 0 out the CL fueling load compensation....its rpm vs load with changes to the closed loop AFR in the middle. This table causes the target AFR to be more like 14.2 when cruising instead of 14.7 |
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#8 |
Scooby Newbie
Member#: 125552
Join Date: Sep 2006
Chapter/Region:
W. Canada
Location: Winnipeg, Manitoba CANADA
Vehicle:05 legacy 2.5i wag |
![]() already did that to the CL fuel load comp. i recently up'd the CL target to 16.5 and its hitting it along with the stock 02 cl ol delays. but i noticed in 3rd gear cruising, it would feel like its hesitating a tiny bit even with the pedal steady??
so i changed the delays to match what cobb had in their map. i've yet to drive enough to feel if drivability is better i dont quite understand the delay counter yet and how to interpret |
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#9 | |
Scooby Specialist
Member#: 164830
Join Date: Nov 2007
Chapter/Region:
SCIC
Location: San Diego
Vehicle:2002 WRX G61 III OVE 58e |
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#10 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
![]() If you want fuel economy, and you're making any boost at all, you're doing something wrong. Wastegate duty only really comes into play about 8-10psi or whatever your wastegate spring provides on its own, and if you're making that much boost then you've already decided that fuel economy isn't important at that moment.
Fuel economy is more about right-foot discipline than tuning. ![]() If you want to make it easier to stay out of boost, rescale the DBW tables to make the throttle less sensitive at low pedal angles, and then ramp up steeply so you can still go WOT when you feel like it. |
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#11 |
Scooby Newbie
Member#: 125552
Join Date: Sep 2006
Chapter/Region:
W. Canada
Location: Winnipeg, Manitoba CANADA
Vehicle:05 legacy 2.5i wag |
![]() even with right foot discipline, these cars are so crappy on gas. 14.7 afr under cruise is not necessary. my old 2000 audi a4 1.8 turbo quattro was a world of difference as far as fuel consumption goes. it also had more torque to help in city driving while consuming less fuel which really confuses me. sure it was a 1.8 I4 with a small turbo but it shouldnt be that big of difference between the a4 and wrx fuel consumption. i was so upset when an old lady t boned it and wrote it off
these cars just arent made with mpg in mind |
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#12 |
Scooby Guru
Member#: 36033
Join Date: Apr 2003
Chapter/Region:
SCIC
Location: Tuning Lab
Vehicle:CEO PhatBottiTuning 2006 STi GTX3582 + Meth |
![]() My car hates city driving. I only get 200-220 miles per tank....whereas i can get 350-375 to a tank with freeway only driving.
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#13 |
Scooby Newbie
Member#: 205568
Join Date: Mar 2009
Location: West TN
Vehicle:2017 WRX STi WRB |
![]() I can get just over 400 per tank on mine if I stay at or below 65mph on the highway.
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#14 | |
Scooby Guru
Member#: 36033
Join Date: Apr 2003
Chapter/Region:
SCIC
Location: Tuning Lab
Vehicle:CEO PhatBottiTuning 2006 STi GTX3582 + Meth |
![]() Quote:
The counter is in computer cycles or something like that. Setting the OL/CL time delay to a value of 5-10 keeps you in CL for cruising and small throttle changes, but switches you over instantly when you romp. i dont have the patience for that. I set my cruise at 85-90mph. |
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#15 |
Scooby Newbie
Member#: 205568
Join Date: Mar 2009
Location: West TN
Vehicle:2017 WRX STi WRB |
![]() Lol, its definitely boring, but there is some satisfaction in rarely having to pass people (less stressful than driving fast) and you never have to worry about being pulled over.
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#16 |
Scooby Guru
Member#: 36033
Join Date: Apr 2003
Chapter/Region:
SCIC
Location: Tuning Lab
Vehicle:CEO PhatBottiTuning 2006 STi GTX3582 + Meth |
![]() I only speed on long trips like 450 miles to phoenix. The speed limit is 75 in AZ so 85 doesnt get you pulled over. I even passed a cop doing 90 last week and he didnt pull me over. He might have been sleeping though.
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#17 |
Scooby Newbie
Member#: 125552
Join Date: Sep 2006
Chapter/Region:
W. Canada
Location: Winnipeg, Manitoba CANADA
Vehicle:05 legacy 2.5i wag |
![]() thx for the tip phatron, i've been logging to make sure im not knocking and so far so good. it is hesitating a bit during acceleration in 2nd gear from 2-3k rpms so im gonna turn it down to 16:1 and see if it gets rid it. i've also set the cl rich/lean limit to 15.9/16.1 , turned down the cl coolant temp comp and zero'd cl load comp
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#18 |
Scooby Specialist
Member#: 224785
Join Date: Sep 2009
Chapter/Region:
MWSOC
Location: neenah
Vehicle:2005 wrx-jdm207 i went black... |
![]() to bring this back to life I am in the process of doing the same thing. what are people doing as far as timing around 2500-3200 rpms and under 1.0 load. on std scaling not half maf'ed or anything.
also how much affect does spray pattern seem to have on mpgs? as well as injector size? I think mine might be a bit large for my application. vehicle is a ej207 with 850 cc injectors. vf37TS setup. matched to a 5mt. |
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