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09-14-2008, 03:19 PM | #51 | |
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i feel ya
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what would be awesome is if we could have the high lift valves through the entire rpm range and be able to tweek that the same way you can with the pedal. i would want constant high lift except under 4k in 5th for highway travel economy. then i could really mess with this pedal cause i could keep it in the power band at all times. anyone know how to do that? or do i need custom cams to accomplish?
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09-14-2008, 04:22 PM | #52 | ||
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Won't work. The switch from the factory is done generally at the point where the torque available on each cam profile crosses. Changing the point where it switched would only be detrimental to performance. At low RPM, you want little overlap and low lift - the low lift, i think, keeps the intake velocity up which promotes good fuel mixing. More overlap would just end up pissing fuel out the tailpipe as both valves would be open at the same time. At high RPM, you want more overlap and lift, the lift to allow flow and the overlap to allow the air's inertia to slam it into the cylinder, as well as to allow scavenging (the inertia of the exhaust creating a low pressure zone after the cylinder which draws more intake air from the other side....). Last edited by sniper1rfa; 09-14-2008 at 04:28 PM. |
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09-15-2008, 03:25 PM | #53 |
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This thread makes me cry.
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09-15-2008, 03:40 PM | #54 |
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09-15-2008, 03:45 PM | #55 |
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09-15-2008, 04:41 PM | #56 |
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thats helpful wility all smug cause you know more than everybody but too scared to take on the liability of tuning someones ecu.
please enlighten us ohh mighty subaru ecu god. what is it exactly that makes you feel like you have a sandpaper condom? |
09-15-2008, 05:55 PM | #57 |
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Am I wrong? Did I **** something up? Great, you know a lot about the engine. If I'm wrong about something, let me know. If you don't, you're just being a dickhead. Yeah, watchunglava seems to have ADD. Also sorry, but he's getting it. Slowly, but that's fine. |
09-15-2008, 08:31 PM | #58 |
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I cant see through my tears anymore, either. But I do have something to say to Watchunglava, If you have the Master2192 map with the flat throttle currently flashed to your ECU, i did notice that he made the throttle maps (accel pedal and throttle plate angle) "straight". I think going back to the stock map might be a bit better for driveability around town and give you somewhere to start changing the table from. I did copy the throttle maps from his flat throttle rom and tried them myself.. seemed a little tricky to start from a stop without either revving it up or bogging iot down. Im still looking into what changes are necessary. Have to go re-ead williatys DBW posts again when i have time to mess with my car for a few hours. |
09-15-2008, 09:30 PM | #59 |
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09-16-2008, 02:40 AM | #60 |
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09-16-2008, 11:53 PM | #61 |
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this mutha
you taking your girly gab all around huh? man we gots issues! you like to talk alot , keep talkin.
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09-16-2008, 11:58 PM | #62 | |
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master
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im never gonna get anywhere tuning cause every discussion i try to have this wility mutha likes to interup with his girly talk. 05 wagon like hes a soccer mom or somethin. wheres my dinner wility!!!!!!! the pedal takes some getting used to , no doubt. but i got the feel of it and i like it. just not right above idle. but apparantly thats baked into the cake . whatever im allmost ase certified , so when i open my shop i guess ill pay someone to tune the ecu's |
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09-17-2008, 12:43 AM | #63 |
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Hey, wagons kick serious ass.
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09-17-2008, 09:11 AM | #64 |
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wow this went downhill quickly...this was a good thread too. I am using his throttle changes on my car and love them, still having problems with reflashing and the car stalling out but that doesn't seem to be a problem with these edits but maybe some vac leak ::shrugs:: please keep this on-topic and contribute...i'd hate to see this crap continue
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09-17-2008, 11:20 AM | #65 | |
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Anyway...it's a damn shame that this dbw thing really doesnt have much of a solution...you would think after enough complaints subaru would come up with a reflash or something |
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09-17-2008, 11:30 AM | #66 | |
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Otherwise, take some logs and ask the guys on the RomRaider forum. |
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09-17-2008, 08:17 PM | #67 |
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Flashed this fix onto my ecu this evening. After stalling backing out of the driveway I rather enjoyed the smoother pedal travel. Thanks for all the great work.
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09-17-2008, 08:53 PM | #68 |
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No problem. I'm glad you got some benefit from it. I figure 90% of the work is figuring this stuff out for myself. It's not really much additional trouble to pass it on to yall.
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11-03-2008, 05:24 PM | #69 |
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Just a few questions:
1. Does the software use linear interpolation to calculate the Target Throttle Plate Opening Angle? i.e. 50% Accelerator Pedal Angle @ 4000RPM = 38% Target Throttle Plate Opening Angle (for the original map / look up table)? 2. If I increased the precision in the x axis and removed some of the pad (excess 100% values), would this have any effect on the way the calculations are performed. Is the lookup table a constant 2D array size, or is the memory dynamically allocated? 3. Are different tables called under different conditions? i.e. one map is for the cruise control, one map for limp mode, etc... Or are the different maps used to help the ECU "learn" the driver's habits? i.e. If the driver is aggressive, use map 1 else if driver is sedate, use map 2, etc... (I skimmed through things after the original post, so I apologize if these have been answered already) Last edited by x86ect; 11-03-2008 at 05:43 PM. |
11-03-2008, 05:45 PM | #70 |
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x86ect - I did increase the precision or resolution of the x axis like you ask about. it should only smooth out the curve of the throttle plate pos/accel pedal position graph (i.e. more points along the curve, not a straighter curve) i didnt notice any difference when using similar values, one with the extra table columns re assigned values other than 100%, and when keeping the # of useful columns the same as stock. but it makes me feel better. I dont know the answer about the memory being a constant size for that table or if its dynamic. i think if anything, its constant, but much of it is being used (wasted) for those extra 100% columns. that would seem like the most simple way. I bet TeaCups or Merchgod, over in the RR forum, would have a definite answer.
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11-03-2008, 06:20 PM | #71 | |||
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11-04-2008, 08:16 AM | #72 |
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Thanks, RaceFaceXC and Williaty. I'll start poking around the RomRaider forums and see if I can learn some more.
I figured out one negative to adding more precision to the table, but I think the results would be imperceptable. |
11-04-2008, 11:07 AM | #73 | |
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Well, it wasn't DBW related in my car and it was freakin' annoying. I really liked the car otherwise but it was just so uncomfortable trying to hold the car at a steady speed. My 2003 also reacted the way you describe with cruise control. All this makes me think the "lurching" problem is not specific to DBW. There's something else going on -- too bad it won't help me with my now-sold 2003. --Bob |
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11-04-2008, 12:45 PM | #74 |
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No, it's the same problem. With a cable-throttle, you control the "mapping" of the pedal to plate via the curve on the cam the cable attaches to. In later-model cable-throttle cars, the cam was milled with a changing radius to "pop" the throttle open off the line. To fix the problem, you get a machinist to cut you a cam with a constant radius.
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11-12-2008, 12:44 PM | #75 |
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For the modified Requested Torque to Target Throttle Plate Opening Angle, can you save a few clock cycles by just mapping the following:
......0 100 100 100 100 100 ... 400 0 100 100 100 100 100 ... 600 0 100 100 100 100 100 ... : since the calculation is linearly interpolated anyways? Sorry if this is a noob question. Last edited by x86ect; 11-12-2008 at 12:46 PM. Reason: added extra "." for formating |
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