Getting Best MPG during Cruise
I didn't ask about getting a beater... I was asking about geting my mileage back up on my Evo... this isn't the "get a beater and save gas thread" so your "contribution" should perhaps go on another thread. This one is about making power and be able to cruise and get better mileage.... if I can get a bigger turbo and get 5-6 more mpg, have more power when I want it, and have it pay for itself several times over during the life of the car, that makes sense to me... maybe i'm the only one though.
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From: St Louis
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From: Czech rep.
I am running Cobb stage2 maps with these changes:
timing advance increased by 2-4 degree in 2000-4000 rpm 0-90 load
closed loop used up to 3500 rpm up to 80 load
using stock mivec mapping in 2000-4000 rpm 0-90 load
coarse WGDC set to 0 up to 2500 rpm
with this setup I found the mileage during cruising to be 2 mpg better than with original OTS Stock2 map.
timing advance increased by 2-4 degree in 2000-4000 rpm 0-90 load
closed loop used up to 3500 rpm up to 80 load
using stock mivec mapping in 2000-4000 rpm 0-90 load
coarse WGDC set to 0 up to 2500 rpm
with this setup I found the mileage during cruising to be 2 mpg better than with original OTS Stock2 map.
I am running Cobb stage2 maps with these changes:
timing advance increased by 2-4 degree in 2000-4000 rpm 0-90 load
closed loop used up to 3500 rpm up to 80 load
using stock mivec mapping in 2000-4000 rpm 0-90 load
coarse WGDC set to 0 up to 2500 rpm
with this setup I found the mileage during cruising to be 2 mpg better than with original OTS Stock2 map.
timing advance increased by 2-4 degree in 2000-4000 rpm 0-90 load
closed loop used up to 3500 rpm up to 80 load
using stock mivec mapping in 2000-4000 rpm 0-90 load
coarse WGDC set to 0 up to 2500 rpm
with this setup I found the mileage during cruising to be 2 mpg better than with original OTS Stock2 map.
Update: well my 2 maps I tried went like this... at cruise they both were better... Goldens you could tell it didn't have near the power... at 3rd gear WOT it didn't... I didn't notice any knock, but I did log it. For some reason under braking and downshifting, I did see some knock... perhaps someone could tell me if that is typical? Note on Golden's map... I did make some timing adjustments as well.
On perfectly flat ground... when I reset the MPG on BOTH maps 27.5 came up first... and stayed right around there. The problem is that there isn't much flat highway here, it's all a little up and down, but on either map mid to high 26's could be achieved.
My own map again at cruise was fine, but at WOT I got several knock counts which I did not log, but I didn't need to I saw .7 and .4 come up several times during the same pull which was to much for me and so I don't think i'll be using that map anymore so that will be deleted.
I think if I take a longer trip I may go ahead and use Golden's map with my own timing additions, but I want to keep it safe so I think i'm going to use the standard OTS map. I'm very hopeful that when I get mellon to retune the car he will be able to get me back up to the mileage I was at, otherwise I may just take off the exhaust and UICP and just say with the Mellon tune and get a MBC and get a little more power.
On perfectly flat ground... when I reset the MPG on BOTH maps 27.5 came up first... and stayed right around there. The problem is that there isn't much flat highway here, it's all a little up and down, but on either map mid to high 26's could be achieved.
My own map again at cruise was fine, but at WOT I got several knock counts which I did not log, but I didn't need to I saw .7 and .4 come up several times during the same pull which was to much for me and so I don't think i'll be using that map anymore so that will be deleted.
I think if I take a longer trip I may go ahead and use Golden's map with my own timing additions, but I want to keep it safe so I think i'm going to use the standard OTS map. I'm very hopeful that when I get mellon to retune the car he will be able to get me back up to the mileage I was at, otherwise I may just take off the exhaust and UICP and just say with the Mellon tune and get a MBC and get a little more power.
Last edited by Methodical4u; Jan 16, 2010 at 03:38 PM.
OK, I started playing with this stuff today. I first added 4* like in the original post. I was definitely hitting the 44*.
My PSIG and Load didn't really change much, but I noticed that my LTFT Cruise is likely off.
@ 40*, @ 70mph they are 7.22 (idle = .58)
@ 44*, @ 70mph they are 4.68 (idle = .19)
My loads in this range are 18-34ish.
Looking through the posts on this thread that's likely high (I mean LTFT Cruise).
I have DW 1000cc injectors on E85. My scaling is 562 and my latencies are:
which are the values that were provided by a couple different vendors.
If you take the 1000*.89 (11% scaling on stock) * .7 (30% more fuel for E85) then that nets you 632.
Although, since my idle looks good and it's the cruise that's off, maybe I need to adjust my latency downward?
Thanks for you help guys
I'm really trying to break the 200mile/tank level here Right now I'm at 175 or so before the "fill up" light comes on.
My PSIG and Load didn't really change much, but I noticed that my LTFT Cruise is likely off.
@ 40*, @ 70mph they are 7.22 (idle = .58)
@ 44*, @ 70mph they are 4.68 (idle = .19)
My loads in this range are 18-34ish.
Looking through the posts on this thread that's likely high (I mean LTFT Cruise).
I have DW 1000cc injectors on E85. My scaling is 562 and my latencies are:
Code:
4.69208 6.12 7.03812 4.2 9.38416 2.808 11.7302 1.992 14.0762 1.488 16.4223 1.2 18.7683 0.912
If you take the 1000*.89 (11% scaling on stock) * .7 (30% more fuel for E85) then that nets you 632.
Although, since my idle looks good and it's the cruise that's off, maybe I need to adjust my latency downward?
Thanks for you help guys
I'm really trying to break the 200mile/tank level here Right now I'm at 175 or so before the "fill up" light comes on.
Last edited by goofygrin; Jan 20, 2010 at 06:00 PM.
OK, I started playing with this stuff today. I first added 4* like in the original post. I was definitely hitting the 44*.
My PSIG and Load didn't really change much, but I noticed that my LTFT Cruise is likely off.
@ 40*, @ 70mph they are 7.22 (idle = .58)
@ 44*, @ 70mph they are 4.68 (idle = .19)
My loads in this range are 18-34ish.
Looking through the posts on this thread that's likely high (I mean LTFT Cruise).
I have DW 1000cc injectors on E85. My scaling is 562 and my latencies are:
which are the values that were provided by a couple different vendors.
If you take the 1000*.89 (11% scaling on stock) * .7 (30% more fuel for E85) then that nets you 632.
Although, since my idle looks good and it's the cruise that's off, maybe I need to adjust my latency downward?
Thanks for you help guys I'm really trying to break the 200mile/tank level here Right now I'm at 175 or so before the "fill up" light comes on.
My PSIG and Load didn't really change much, but I noticed that my LTFT Cruise is likely off.
@ 40*, @ 70mph they are 7.22 (idle = .58)
@ 44*, @ 70mph they are 4.68 (idle = .19)
My loads in this range are 18-34ish.
Looking through the posts on this thread that's likely high (I mean LTFT Cruise).
I have DW 1000cc injectors on E85. My scaling is 562 and my latencies are:
Code:
4.69208 6.12 7.03812 4.2 9.38416 2.808 11.7302 1.992 14.0762 1.488 16.4223 1.2 18.7683 0.912
If you take the 1000*.89 (11% scaling on stock) * .7 (30% more fuel for E85) then that nets you 632.
Although, since my idle looks good and it's the cruise that's off, maybe I need to adjust my latency downward?
Thanks for you help guys
I'm really trying to break the 200mile/tank level here Right now I'm at 175 or so before the "fill up" light comes on.Since you use your idle LTFT during idle and decel.
If the idle trim is less positive than the cruise trim, you need to decrease the deadtime, or in terms of ECUFlash, you need to decrease the latency value.
ok, so I lowered the latencies... and my Cruise LTFT actually went up... I think I might need to reset the ECU (something is pinging in my memory that tephra mentioned you have to reset the ECU somehow to make the changes to the fuel trims "take").
Well crap. I was doing pulls too.
When I started I was running E82. I had to get more gas before the last pull. The new tank was E82-E83 (the ECA was fluctuating a bit).
Now my AFRs went up .3 to .4 (like 12.1 to 12.4 -- remember E85). Sigh.
When I started I was running E82. I had to get more gas before the last pull. The new tank was E82-E83 (the ECA was fluctuating a bit).
Now my AFRs went up .3 to .4 (like 12.1 to 12.4 -- remember E85). Sigh.
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Injector scaling changes will effect the the WOT fueling, while latency compensation adjustments won't.
ya, it was you in this thread that said that lol.
I went out and pulled the battery and I'll see what it does tomorrow. I also richened it up a bit too.
It was the E80 -> E83 that caused me to go lean (the more E in the E"85" the leaner you get). I wish there was a way we could feed the output of the ECA into the ECU and have it manage the afrs better (Megasquirt does this)... I think I'm dreaming/on the fringe on wanting this though...
I went out and pulled the battery and I'll see what it does tomorrow. I also richened it up a bit too.
It was the E80 -> E83 that caused me to go lean (the more E in the E"85" the leaner you get). I wish there was a way we could feed the output of the ECA into the ECU and have it manage the afrs better (Megasquirt does this)... I think I'm dreaming/on the fringe on wanting this though...
OK, lowering the latencies was the wrong way to go...
Now my cruise is maxed out at 12.5! And this morning my AFRs were all over the place as the ECU tried to figure things out lol.
Ya... and during a pull things got really wonky! I've not tuned for 300 load!
Further down the log, the Cruise LTFT goes to 12.5... sigh.
Now my cruise is maxed out at 12.5! And this morning my AFRs were all over the place as the ECU tried to figure things out lol.
Ya... and during a pull things got really wonky! I've not tuned for 300 load!
Code:
RPM PSIG Timing Knock LoadFuel LTFT_Cruise inno.afr 2121.09 -0.2315 25 0 75.3125 4.10156 22.0206 2261.72 0.05861 21 0 82.8125 4.10156 15.6849 2246.09 0.39719 25 0 88.125 4.10156 13.2006 2207.03 0.9292 23 0 94.375 4.10156 12.6273 2261.72 1.46128 23 0 100 4.10156 12.8625 2304.69 2.09005 23 0 104.688 4.10156 13.083 2296.88 2.67046 23 0 110.625 4.10156 13.1565 2339.84 3.34761 23 0 116.563 4.10156 13.0536 2386.72 4.21822 23 1 121.25 4.10156 13.2447 2394.53 5.08884 21 1 127.5 4.10156 13.23 2437.5 5.95945 21 1 134.063 4.10156 13.23 2472.66 6.83007 21 1 140.313 4.10156 13.3476 2500 7.79742 21 1 146.25 4.10156 12.5097 2535.16 9.15171 20 1 154.063 4.10156 12.2892 2578.13 10.0223 18 1 161.563 4.10156 12.2304 2636.72 11.4733 18 1 169.688 4.10156 12.054 2679.69 12.9244 19 0 178.75 4.10156 12.0981 2722.66 14.4721 17 0 189.063 4.10156 12.0981 2765.63 16.1166 16 0 199.375 4.10156 12.0246 2824.22 18.0997 16 0 211.563 4.10156 12.0687 2878.91 20.9534 14 0 231.563 4.10156 12.1422 2925.78 23.662 12 0 254.688 4.10156 12.7155 2980.47 26.9509 10 1 278.125 4.10156 12.9213 3097.66 29.5628 8 1 295 4.10156 13.1418 3082.03 31.304 8 0 301.563 4.10156 13.1124 3179.69 31.7393 8 0 300.625 4.10156 12.7596 3265.63 31.6426 9 0 286.875 4.10156 12.3186 3316.41 28.7889 11 0 241.875 4.10156 12.2892 3367.19 26.564 13 0 237.188 4.10156 12.6273 3437.5 26.032 13 0 245.313 4.10156 12.8625 3507.81 25.7901 12 0 247.188 4.10156 12.9213 3558.59 26.032 11 0 254.688 4.10156 12.8772 3636.72 26.3222 12 0 258.438 4.10156 12.8625 3691.41 26.4189 13 0 253.125 4.10156 12.7302 3746.09 26.3705 13 0 254.063 4.10156 12.6714 3808.59 26.3222 13 0 256.25 4.10156 12.8772 3910.16 26.3705 13 0 255.625 4.10156 12.6273 3933.59 26.4189 14 0 254.688 4.10156 12.6714 4019.53 26.7091 13 0 257.813 4.10156 12.8037 4113.28 26.564 13 0 259.063 4.10156 12.7596 4171.88 26.6607 13 0 259.375 4.10156 12.7449 4214.84 26.8058 13 0 260.625 4.10156 12.8184 4246.09 26.9026 12 0 265 4.10156 12.5832 4355.47 26.9026 12 0 268.438 4.10156 12.6861 4449.22 26.9026 12 0 265.625 4.10156 12.6126 4527.34 26.5156 12 0 266.563 4.10156 12.495 4617.19 26.6124 12 0 266.875 4.10156 12.3921 4679.69 26.564 12 0 266.25 4.10156 12.4215 4796.88 26.7575 13 0 264.375 4.10156 12.4068 4832.03 26.8058 13 0 264.063 4.10156 12.5538 4875 26.6607 14 0 262.813 4.10156 12.3186 4992.19 26.564 14 0 259.375 4.10156 12.6567 5039.06 26.3705 14 0 260 4.10156 12.5979 5089.84 26.3222 14 0 258.125 4.10156 12.4362 5140.63 26.2738 14 0 255.313 4.10156 12.5391 5238.28 26.032 15 0 254.063 4.10156 12.7155 5312.5 25.7901 15 0 254.063 4.10156 12.5832 5367.19 25.8385 16 0 250.625 4.10156 12.7008 5425.78 25.4999 16 0 252.188 4.10156 12.642 5488.28 25.4032 16 0 249.375 4.10156 12.5832 5562.5 25.0646 16 0 248.125 4.10156 12.6861 5613.28 25.113 16 0 247.188 4.10156 12.789 5675.78 25.0646 16 0 247.5 4.10156 12.6714 5730.47 24.8711 16 0 245.313 4.10156 12.6714 5792.97 24.6293 18 0 244.063 4.10156 12.6273 5875 24.194 18 0 241.25 4.10156 12.7449 5925.78 24.0973 18 0 239.063 4.10156 12.5832 5984.38 23.8554 18 0 236.25 4.10156 12.5685 6035.16 23.4685 18 0 235.625 4.10156 12.7302 6085.94 23.1299 18 0 232.5 4.10156 12.5685 6156.25 22.6462 17 1 230.313 4.10156 12.5685 6199.22 22.5011 18 0 229.375 4.10156 12.6273 6265.63 22.0658 18 0 226.875 4.10156 12.4656 6312.5 21.824 17 1 226.563 4.10156 12.5538 6378.91 21.6789 17 1 224.688 4.10156 12.5979 6425.78 21.292 17 1 222.188 4.10156 12.5685 6480.47 21.0017 17 1 219.688 4.10156 12.5832 6539.06 20.7599 17 1 217.813 4.10156 12.5244 6574.22 20.5664 17 1 217.188 4.10156 12.4509 6625 20.373 18 0 216.563 4.10156 12.5538 6691.41 19.986 19 0 213.125 4.10156 12.5391 6746.09 19.8893 19 0 209.688 4.10156 12.5391 6781.25 19.6958 19 0 210 4.10156 12.7155 6804.69 19.5024 19 0 215 4.10156 12.5097 6855.47 19.3089 19 0 214.375 4.10156 12.201 6906.25 19.1154 19 0 212.813 4.10156 12.2304 6957.03 18.8736 19 0 206.25 4.10156 12.201 7007.81 18.8252 20 0 202.188 4.10156 12.2304 7042.97 18.535 20 0 200 4.10156 12.5685 7082.03 18.3899 20 0 200 4.10156 12.5538 7128.91 18.0997 20 0 206.875 4.10156 12.642 7191.41 15.633 20 0 173.75 4.10156 12.0246
yep wideband is accurate.
It's the difference in resetting the ECU and going from E80 to E83. Here's the log from the pull right before I filled up:
It's the difference in resetting the ECU and going from E80 to E83. Here's the log from the pull right before I filled up:
Code:
RPM PSIG Timing Knock LoadFuel inno.afr 2320.31 2.33189 24 0 101.563 14.3766 2355.47 3.00904 24 0 108.75 13.6122 2398.44 3.68618 24 0 113.75 13.4505 2464.84 4.36333 24 0 119.063 13.1124 2496.09 4.9921 24 0 123.438 13.0242 2566.41 5.91109 22 0 130 12.5391 2625 6.87844 23 0 135.313 12.6714 2667.97 7.89415 22 0 141.875 12.1275 2753.91 8.81314 21 0 148.125 11.5101 2808.59 9.97396 21 0 155.938 11.2602 2882.81 11.5217 20 0 165.313 11.172 2960.94 12.9244 20 0 176.563 11.2749 3039.06 14.9558 17 0 189.063 11.2602 3140.63 17.3742 17 0 203.125 11.3484 3218.75 20.0344 15 0 224.375 12.0099 3332.03 23.1783 13 0 248.438 12.0834 3433.59 26.7091 10 0 274.063 12.2157 3539.06 28.3536 9 0 281.875 12.3186 3660.16 28.934 10 0 274.063 11.8482 3785.16 29.0308 11 0 267.5 11.907 3867.19 28.9824 11 0 263.75 12.1863 4019.53 28.4987 13 0 260.625 12.1569 4167.97 28.3052 13 0 260.313 12.201 4234.38 28.0634 13 0 260 12.1716 4363.28 27.483 13 0 261.875 12.0099 4503.91 26.9993 13 0 259.688 12.1569 4585.94 26.6607 13 0 255 12.1569 4714.84 26.3222 13 0 256.875 11.8923 4859.38 26.1287 15 0 252.813 11.9805 4914.06 26.1771 15 0 253.438 11.8776 5050.78 25.8385 15 0 250.313 11.8188 5164.06 25.7418 15 0 249.375 12.1422 5261.72 25.8385 16 0 248.75 11.8335 5378.91 25.4032 16 0 248.438 12.201 5492.19 25.3548 16 0 246.563 12.0981 5562.5 24.7744 16 0 245 12.1422 5695.31 24.6293 17 0 240.938 12.0687 5800.78 24.3391 18 0 235.938 12.201 5859.38 23.9038 18 0 234.688 12.4509 6000 23.3234 18 0 229.688 12.201 6085.94 22.8881 18 0 226.25 12.2598 6179.69 22.5011 18 0 223.75 12.2892 6281.25 21.9207 18 0 220.625 12.2157 6351.56 21.4371 17 1 218.125 12.2892 6460.94 20.905 17 1 215 12.0834 6542.97 20.4697 18 1 210.938 12.1422 6621.09 20.0344 19 0 208.438 12.201 6703.13 19.6958 19 0 209.688 12.3039 6773.44 19.3573 19 0 205 12.3627 6875 19.0187 20 0 203.438 12.1128 6945.31 18.7285 20 0 200 12.1569 7007.81 18.4866 20 1 198.75 12.1863 7082.03 18.1481 20 1 197.5 12.1275 7171.88 17.7611 20 1 200 11.8041 7210.94 17.4709 20 0 197.813 12.0834 7289.06 15.0525 21 1 165.625 11.172