My first datalog, can someone explain the funkiness?
Apr 11, 2004 | 03:54 AM
#1
Thread Starter
Evolving Member
Joined: Jun 2003
Posts: 265
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From: SW PA
My first datalog, can someone explain the funkiness?
I have a stock car, except for the boost restrictor removal. I noticed that it was cutting out a bit at part throttle in higher gears with the default UTEC map. I assume it's timing being pulled, but I don't really know. It might even be boost cut or something, because sometimes it's kind of abrupt, and I can hear the drivetrain clunk. I did some logs today, when it was a bit warmer, it was around 50F when I had the problems. I was curious to see if timing was being pulled, but I couldn't reproduce the problem today while logging. This is a full throttle run in 5th gear, data set #4, going from 2500 RPM to 6200. It doesn't show any knock, but I don't know if the timing looks right. Shouldn't it continually decrease as the RPM's increase?
Code:
EXT MOD MOD
TIME RPM MAP MAF TPS MLP Knock IGN#1 INJ#1 IGN FUEL BOOST
dig deg duty deg % (OL)
04355605 2496 255 150 75 00 00 +36.4 6.0 ECU. +0.0 ECU.
04355681 2500 255 165 75 00 00 +35.3 6.0 ECU. +0.0 ECU.
04355757 2536 255 167 75 00 00 +35.4 6.0 ECU. +0.0 ECU.
04356134 2510 255 169 75 00 00 +34.3 6.0 ECU. +0.0 ECU.
04356534 2498 255 162 75 00 00 +35.4 5.0 ECU. +0.0 ECU.
04356934 2510 254 176 75 00 00 +36.4 6.0 ECU. +0.0 ECU.
04357334 2517 254 195 76 00 00 +35.4 8.0 ECU. +0.0 ECU.
04357734 2550 254 263 255 10 00 +20.9 11.0 +11.0 +0.0 100.00
04358134 2574 254 296 255 10 00 +19.1 12.0 +10.9 +0.0 100.00
04358534 2552 254 305 255 10 00 +19.1 13.0 +10.8 +0.0 100.00
04358934 2560 254 411 255 10 00 +18.0 14.0 +10.8 +0.0 100.00
04359334 2583 255 448 255 10 00 +17.4 14.0 +10.7 +0.0 100.00
04359734 2630 255 379 255 10 00 +16.3 15.0 +10.6 +0.0 100.00
04360134 2622 255 463 255 10 00 +15.2 16.0 +10.6 +0.0 100.00
04360534 2643 255 389 255 10 00 +13.4 17.0 +10.5 +0.0 100.00
04360934 2712 255 404 255 10 00 +11.3 18.0 +10.4 +0.0 100.00
04361334 2727 255 442 255 10 00 +9.9 19.0 +10.3 +0.0 100.00
04361734 2721 255 456 255 10 00 +8.8 20.0 +10.1 +0.0 100.00
04362134 2748 255 638 255 10 00 +8.9 21.0 +10.1 +0.0 100.00
04362534 2796 255 483 255 10 00 +7.5 22.0 +10.0 +0.0 100.00
04362934 2853 255 598 255 10 00 +6.4 24.0 +10.0 +0.0 100.00
04363334 2868 255 636 255 10 00 +6.5 25.0 +10.0 +0.0 100.00
04363734 2906 255 623 255 10 00 +6.5 26.0 +10.0 +0.0 100.00
04364134 2903 255 691 255 10 00 +5.2 28.0 +10.0 +0.0 100.00
04364534 2981 255 605 255 10 00 +5.3 30.0 +10.0 +0.0 100.00
04364934 2970 255 872 255 20 00 +5.3 32.0 +10.0 +0.0 100.00
04365334 3049 255 821 255 20 00 +5.4 34.0 +10.0 +0.0 100.00
04365734 3055 255 555 255 30 00 +4.2 35.0 +10.8 +0.0 100.00
04366134 3144 255 917 255 30 00 +3.4 37.0 +10.7 +0.0 100.00
04366534 3129 255 1024 255 30 00 -0.8 39.0 +10.5 +0.0 100.00
04366934 3214 255 1002 255 30 00 -3.5 41.0 +10.3 +0.0 100.00
04367334 3217 255 685 255 30 00 -3.2 41.0 +10.2 +0.0 100.00
04367734 3303 255 844 255 30 00 -4.2 43.0 +10.0 +0.0 100.00
04368134 3343 255 829 255 30 00 -5.2 43.0 +9.8 +0.0 100.00
04368534 3340 254 719 255 30 00 -5.1 44.0 +9.7 +0.0 100.00
04368934 3422 254 1061 255 30 00 -3.8 44.0 +9.6 +0.0 100.00
04369334 3422 254 1084 255 30 00 -3.7 45.0 +9.4 +0.0 100.00
04369734 3512 254 1133 255 40 00 -3.8 45.0 +9.2 -1.0 100.00
04370134 3497 255 963 255 60 00 -3.8 46.0 +8.0 -1.0 100.00
04370534 3523 254 1162 255 30 00 -3.5 46.0 +8.9 +0.0 100.00
04370934 3576 254 759 255 40 00 -3.5 48.0 +8.7 -1.0 100.00
04371334 3599 254 1014 255 40 00 -3.5 48.0 +8.6 -1.0 100.00
04371734 3695 254 1199 255 40 00 -3.5 49.0 +8.4 -1.0 100.00
04372134 3679 254 784 255 40 00 -3.5 50.0 +8.3 -1.0 100.00
04372534 3724 254 676 255 50 00 -2.4 50.0 +8.0 -1.0 100.00
04372934 3757 254 616 255 40 00 -2.3 51.0 +8.1 -1.0 100.00
04373334 3840 255 1182 255 40 00 -2.4 52.0 +8.1 -1.0 100.00
04373734 3805 255 972 255 40 00 -2.1 52.0 +8.3 -1.0 100.00
04374134 3871 255 1234 255 40 00 -2.1 53.0 +8.3 -1.0 100.00
04374534 3949 254 1222 255 30 00 -2.1 54.0 +8.6 +0.0 100.00
04374934 3926 254 1138 255 30 00 -1.9 54.0 +8.7 +0.0 100.00
04375334 4016 254 938 255 30 00 -1.6 54.0 +8.8 -0.4 100.00
04375734 3982 254 925 255 40 00 -1.5 54.0 +8.9 -1.0 100.00
04376134 4035 255 1061 255 40 00 -1.6 54.0 +8.9 -1.0 100.00
04376534 4065 255 910 255 50 00 -1.5 55.0 +7.8 -1.0 100.00
04376934 4145 255 952 255 50 00 -1.2 55.0 +7.6 -1.0 100.00
04377334 4105 254 1149 255 50 00 -1.2 56.0 +7.5 -1.0 100.00
04377734 4140 254 1329 255 50 00 -1.2 56.0 +7.4 -1.0 100.00
04378134 4177 254 1288 255 50 00 -1.2 55.0 +7.3 -1.0 100.00
04378534 4208 254 1219 255 50 00 +0.2 55.0 +7.2 -1.0 100.00
04378934 4246 255 1052 255 50 00 +0.1 55.0 +7.1 -2.8 100.00
04379334 4268 255 1199 255 50 00 +0.2 57.0 +7.0 -1.6 100.00
04379734 4351 254 1288 255 50 00 +0.3 58.0 +7.2 -1.4 100.00
04380134 4397 254 1302 255 50 00 +0.7 59.0 +7.3 -1.6 100.00
04380534 4357 254 1355 255 50 00 +0.5 60.0 +7.4 -2.4 100.00
04380934 4409 254 994 255 50 00 +0.6 60.0 +7.5 -2.2 100.00
04381334 4415 255 1351 255 60 00 +0.6 61.0 +7.7 -2.6 100.00
04381734 4510 255 1240 255 60 00 +1.2 60.0 +7.7 -3.0 100.00
04382134 4541 254 1118 255 50 00 +1.1 60.0 +7.9 -3.2 100.00
04382534 4572 254 1333 255 50 00 +1.0 61.0 +8.0 -3.4 100.00
04382934 4553 254 1385 255 50 00 +1.2 62.0 +8.2 -3.2 100.00
04383334 4642 254 1400 255 60 00 +1.5 62.0 +8.0 -4.0 100.00
04383734 4668 255 1319 255 60 00 +1.4 63.0 +8.0 -4.4 100.00
04384134 4714 255 1170 255 60 00 +2.1 63.0 +8.0 -4.6 100.00
04384534 4721 255 1312 255 60 00 +2.0 64.0 +8.0 -4.2 100.00
04384934 4688 255 1358 255 60 00 +2.5 62.0 +8.0 -6.8 100.00
04385334 4775 255 1362 255 60 00 +2.4 63.0 +8.0 -5.2 100.00
04385734 4810 255 1128 255 70 00 +2.3 65.0 +8.0 -4.6 100.00
04386134 4823 255 1179 255 70 00 +1.8 66.0 +8.2 -4.9 100.00
04386534 4873 255 1369 255 70 00 +2.7 66.0 +8.6 -4.9 100.00
04386934 4852 255 1408 255 70 00 +2.7 67.0 +8.8 -5.2 100.00
04387334 4916 255 1165 255 60 00 +2.8 67.0 +9.0 -6.4 100.00
04387734 4909 255 1369 255 70 00 +2.7 68.0 +9.2 -6.7 100.00
04388134 4923 255 1340 255 70 00 +3.2 68.0 +9.4 -6.7 100.00
04388534 5012 255 1219 255 70 00 +3.1 67.0 +9.6 -7.0 100.00
04388934 5058 254 1347 255 70 00 +3.1 69.0 +9.8 -7.2 100.00
04389334 5012 254 1388 255 70 00 +3.1 69.0 +10.0 -7.0 100.00
04389734 5058 254 1572 255 70 00 +3.5 69.0 +10.0 -7.0 100.00
04390134 5089 254 1428 255 70 00 +3.6 69.0 +10.0 -7.0 100.00
04390534 5096 254 1457 255 60 00 +3.6 69.0 +10.0 -7.1 100.00
04390934 5128 254 1506 255 70 00 +3.7 70.0 +10.0 -7.1 100.00
04391334 5208 255 1291 255 70 00 +3.8 70.0 +10.0 -7.1 100.00
04391734 5192 255 1515 255 70 00 +3.7 71.0 +10.0 -7.2 100.00
04392134 5200 255 1501 255 80 00 +3.7 70.0 +9.0 -9.2 100.00
04392534 5200 254 1366 255 90 00 +3.7 71.0 +9.0 -7.5 100.00
04392934 5249 254 1529 255 80 00 +4.5 71.0 +9.0 -7.8 100.00
04393334 5274 254 1412 255 80 00 +4.6 71.0 +9.0 -7.6 100.00
04393734 5282 254 1358 255 80 00 +4.5 72.0 +9.1 -7.6 100.00
04394134 5402 254 1515 255 80 00 +4.6 73.0 +9.3 -7.8 100.00
04394534 5341 255 1519 255 80 00 +5.0 72.0 +9.4 -8.6 100.00
04394934 5376 255 1479 255 80 00 +4.9 72.0 +9.5 -8.8 100.00
04395334 5393 255 1562 255 80 00 +4.9 73.0 +9.6 -8.8 100.00
04395734 5420 255 1510 255 80 00 +4.9 73.0 +9.7 -8.8 100.00
04396134 5482 254 1449 255 80 00 +5.4 73.0 +9.8 -9.4 100.00
04396534 5473 254 1506 255 80 00 +5.4 74.0 +10.2 -9.7 100.00
04396934 5509 254 1602 255 80 00 +5.4 73.0 +9.9 -10.3 100.00
04397334 5509 254 1445 255 80 00 +5.4 74.0 +10.0 -9.5 100.00
04397734 5537 255 1547 255 80 00 +5.6 74.0 +10.1 -9.5 100.00
04398134 5555 255 1529 255 80 00 +5.7 75.0 +10.2 -9.6 100.00
04398534 5630 255 1618 255 80 00 +6.9 74.0 +10.3 -9.7 100.00
04398934 5611 255 1492 255 80 00 +6.8 75.0 +10.4 -10.0 100.00
04399334 5668 255 1543 255 80 00 +7.2 75.0 +10.4 -9.8 100.00
04399734 5630 255 1724 255 90 00 +7.1 76.0 +10.0 -9.8 100.00
04400134 5688 255 1510 255 90 00 +7.1 76.0 +10.0 -9.9 100.00
04400534 5698 255 1557 255 90 00 +7.4 77.0 +10.0 -10.0 100.00
04400934 5717 255 1529 255 90 00 +7.4 76.0 +10.0 -11.2 100.00
04401334 5797 255 1661 255 90 00 +8.5 75.0 +10.0 -10.4 100.00
04401734 5737 255 1547 255 90 00 +8.6 75.0 +10.0 -11.2 100.00
04402134 5807 255 1672 255 90 00 +8.6 76.0 +10.0 -10.3 100.00
04402534 5777 255 1519 255 90 00 +9.0 76.0 +10.2 -10.4 100.00
04402934 5807 255 1592 255 90 00 +8.8 76.0 +10.4 -10.4 100.00
04403334 5878 255 1618 255 90 00 +8.9 76.0 +10.6 -10.8 100.00
04403734 5889 255 1373 255 90 00 +7.5 78.0 +10.6 -10.8 100.00
04404134 5858 255 1506 255 90 00 +7.9 77.0 +10.6 -10.6 100.00
04404534 5868 255 1577 255 100 00 +6.8 78.0 +10.5 -9.4 100.00
04404934 5952 255 1736 255 90 00 +8.0 78.0 +11.0 -11.1 100.00
04405334 5910 254 1524 255 90 00 +8.9 78.0 +11.2 -10.9 100.00
04405734 5973 254 1760 255 90 00 +9.5 78.0 +11.4 -11.2 100.00
04406134 5931 254 1724 255 90 00 +9.4 78.0 +11.6 -11.1 100.00
04406534 5952 254 1519 255 90 00 +9.4 78.0 +11.6 -11.7 100.00
04406934 5973 255 1592 255 90 00 +9.3 78.0 +11.8 -11.7 100.00
04407334 5984 255 1587 255 90 00 +9.6 78.0 +11.8 -11.3 100.00
04407734 5995 255 1623 255 100 00 +9.7 79.0 +11.0 -10.0 100.00
04408134 6093 255 1677 255 90 00 +10.8 78.0 +12.1 -11.4 100.00
04408534 6049 255 1597 255 90 00 +10.8 78.0 +12.1 -11.3 100.00
04408934 6116 254 1748 255 90 00 +11.1 78.0 +12.1 -11.5 100.00
04409334 6071 254 1497 255 90 00 +11.0 77.0 +12.3 -11.4 100.00
04409734 6150 254 1633 255 90 00 +11.0 78.0 +12.4 -11.5 100.00
04410134 6161 254 1785 255 90 00 +11.0 78.0 +12.4 -11.5 100.00
04410534 6172 255 1773 255 90 00 +11.5 78.0 +12.5 -11.6 100.00
04410934 6207 254 1766 255 90 00 +11.6 78.0 +12.5 -11.5 100.00
04411334 6195 254 1754 255 90 00 +11.5 77.0 +12.6 -11.6 100.00
04411734 6150 254 1712 255 90 00 +12.5 77.0 +12.6 -11.6 100.00
Apr 11, 2004 | 09:34 AM
#2
Could be two things.. First, I don't see any knock, so either its not picking it up, or its not happening..
If you don't have a boost gauge installed, you NEED to install one. But as long as boost is 19-21psi in this map, your ok (the stock UTEC map is SO conservative that the stock ECU feels stronger at part throttle! Thats due to how the boost is being controlled at part throttle)
You say your EVO is stock, no aftermarket open air filter?
Ok.. Finally.. CHANGE YOUR PLUGS, put a plug in one step cooler.. Even if thats not the solution to your problem, it makes a huge difference. I also found that the more or less stock gap of .025 or .026 works best on a cooler plug.
It could be fuel or boost cut.. but there's nothing in those maps that could be enough to trigger it.. it sounds more like boost spiking if its not a misfire..
If you don't have a boost gauge installed, you NEED to install one. But as long as boost is 19-21psi in this map, your ok (the stock UTEC map is SO conservative that the stock ECU feels stronger at part throttle! Thats due to how the boost is being controlled at part throttle)
You say your EVO is stock, no aftermarket open air filter?
Ok.. Finally.. CHANGE YOUR PLUGS, put a plug in one step cooler.. Even if thats not the solution to your problem, it makes a huge difference. I also found that the more or less stock gap of .025 or .026 works best on a cooler plug.
It could be fuel or boost cut.. but there's nothing in those maps that could be enough to trigger it.. it sounds more like boost spiking if its not a misfire..
Last edited by MalibuJack; Apr 11, 2004 at 09:49 AM.
Apr 11, 2004 | 09:55 AM
#3
see where you go from 0% load to 10% load???? your timing is 35 then jumps to 11. This is where the utec takes over timing controll. You will get a very noticable cut out feeling there. Mine does the same thing. I had to get rid of my intake and feather the timing in that area. Now its almost not noticeable at all. All your logs should be log #1. Its better. Thats what TXS told me. What else is strange is that you bounced into load 100 twice but never held it. Look at one of my logs and you see that i hold 100 load when reached. HHHmmmm RRR
Apr 11, 2004 | 10:00 AM
#4
DUH! I missed that he said part throttle..
I redid my maps to remove all of the timing settings and left the fuel and boost in the map.. now I'm working on new timing that sneaks up on the "good settings" i've gotten, so the transition from stock isn't as dramatic..
But I suspect he's having the same issue that I did at first, either boost spike, or a misfire due to worn plugs..
I don't recall him saying he has a boost gauge so we'll have to wait and see..
Howevever Ray is right about the timing.. I had forgotten about the transition point, I raised my cutover point to 33% from 25% for the point where it takes over from the stock ECU, so I wouldn't hit it as often when doing part throttle driving.
I've spent enough time on my own map that I don't get it anymore..
I redid my maps to remove all of the timing settings and left the fuel and boost in the map.. now I'm working on new timing that sneaks up on the "good settings" i've gotten, so the transition from stock isn't as dramatic..
But I suspect he's having the same issue that I did at first, either boost spike, or a misfire due to worn plugs..
I don't recall him saying he has a boost gauge so we'll have to wait and see..
Howevever Ray is right about the timing.. I had forgotten about the transition point, I raised my cutover point to 33% from 25% for the point where it takes over from the stock ECU, so I wouldn't hit it as often when doing part throttle driving.
I've spent enough time on my own map that I don't get it anymore..
Last edited by MalibuJack; Apr 11, 2004 at 10:04 AM.
Apr 11, 2004 | 07:40 PM
#5
Thread Starter
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Joined: Jun 2003
Posts: 265
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From: SW PA
Thanks for the input. I do have a boost guage, and no other mods (stock exhaust & intake). The boost seems to fluctuate between 1.48 and 1.57 hkPa (21.5 and 22.8 PSI). My peak hold shows that the highest I ever hit is 1.57, and only seems to be hitting that when it's below 45F. And when my boost alarm goes off at 1.52, I'm not always feeling this cutting out at that time, it happens when the boost is lower. So I guess it's not a boost spike causing a cut. Sometimes just after it starts pulling hard, it cuts out a little, then picks back up again. And it definitely seems worse in cold weather. It's not doing this often, but I don't want it to ever happen, I'm worried that it's knock causing timing to be pulled.
I also thought it was odd that the load only hit 100% twice. Especially since I had it floored in 5th the whole time.
I don't think I'm feeling the transition from 0% to 10% load, because it seems like it happens at a higher load point than that. Unfortunately I haven't been able to get this to happen while logging yet so it's hard to say for sure. rraulston, what did you do, just add a few degrees of timing in the 10-20% area?
I guess I'll give the colder plugs a shot.
Wouldn't a misfire cause a CEL?
BTW, I am using Amoco 93 octane.
I also thought it was odd that the load only hit 100% twice. Especially since I had it floored in 5th the whole time.
I don't think I'm feeling the transition from 0% to 10% load, because it seems like it happens at a higher load point than that. Unfortunately I haven't been able to get this to happen while logging yet so it's hard to say for sure. rraulston, what did you do, just add a few degrees of timing in the 10-20% area?
I guess I'll give the colder plugs a shot.
Wouldn't a misfire cause a CEL?
BTW, I am using Amoco 93 octane.
Last edited by BigBoogieman; Apr 11, 2004 at 07:43 PM.
Apr 11, 2004 | 07:50 PM
#6
Yes, an ignition (Coil or grounded plug) misfire would cause a check engine light, but this is a compression related misfire.. basically the turbulence/cylinder pressure is enough to "blow out" the spark.. happens pretty frequently and its a fairly inexpensive fix to replace the plugs.. I bet their pretty fouled at this point too, which gives up a little on their efficiency.
also check your transition point, some of the UTEC's sold have them set at 80% instead of 25% (though I recommend 33% unles you've got your timing really dialed in and transitioning good)
also check your transition point, some of the UTEC's sold have them set at 80% instead of 25% (though I recommend 33% unles you've got your timing really dialed in and transitioning good)
Apr 11, 2004 | 08:23 PM
#7
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Joined: Jun 2003
Posts: 265
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From: SW PA
Thanks Jack. Is the transition point "TPS threshold point for mapping"? If so, then mine is at 80%. I thought I went through all the settings before I did the install to make sure they were set at the correct default values, but I must have missed that somehow. So this means the stock ECU was doing all the work below 80% throttle, since the stock map has "ECU" in all the 0% load points? If that's the case then I could very well be feeling roughness right as I cross 80% TPS, since it happens when I roll on the throttle. I have felt a slightly abrupt kick when rolling on the throttle a couple times. But that's not the same issue as when it cuts out, that's happening at full throttle.
Looking at the stock boost map, it has ECU at all TPS points below 80%, and has 100% for all TPS points above 80%. So stock boost levels are being used when the throttle is below 80%, right? Should this also be adjusted? It seems like it would be tricky to smooth this part out, since I don't know what the stock ECU levels would be near the transition point.
Can you tell me what plugs to get? Are the NGK BPR 7ES that LancerShop has a good choice? And how often do you change your plugs?
Looking at the stock boost map, it has ECU at all TPS points below 80%, and has 100% for all TPS points above 80%. So stock boost levels are being used when the throttle is below 80%, right? Should this also be adjusted? It seems like it would be tricky to smooth this part out, since I don't know what the stock ECU levels would be near the transition point.
Can you tell me what plugs to get? Are the NGK BPR 7ES that LancerShop has a good choice? And how often do you change your plugs?
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Apr 11, 2004 | 08:48 PM
#8
Plugs generally last 10k-15k miles.. with high boost its probably good to replace them more frequently..
I don't recall the exact term for the transition point, but it does sound like that one "TPS Threshold poit for mapping" There's another thread posted with the setting to look for, but that definitely sounds like the one.
the funny part is, when you move it from 80% to 25% (or 33%) you'll notice it more in highway driving, when your accellerating at part throttle, since you'll hit that point fairly frequently..
The fuel and boost aren't so much an issue with that stumble, its the timing difference that your feeling, so once you got a transition point that you like, you need to set your timing in the cells of approx 30% to be close to what it may see stock at that point, and you can minimize the stumble..
at WOT, a stumble (surging sensation) can be fuel cut, misfire, or boost cut.. but if you still have stock plugs, I'd guess that its more than likely you need to replace the plugs.
If I recall the stock plugs were either DENSO or NGK, Irridium plugs either way.. If I recall, the 7 range was similar to the stock heat range, but I could be wrong. Just verify it before you buy them.. when you get them, compare the plugs to the stock plug, the insulator (white ceramic part in the center) shouldn't stick out as far as the stock plug. and you can gap them as high as .030 though at that gap I got a bit of misfire, I tightened them to .026 which is .001 larger than stock .025
I don't recall the exact term for the transition point, but it does sound like that one "TPS Threshold poit for mapping" There's another thread posted with the setting to look for, but that definitely sounds like the one.
the funny part is, when you move it from 80% to 25% (or 33%) you'll notice it more in highway driving, when your accellerating at part throttle, since you'll hit that point fairly frequently..
The fuel and boost aren't so much an issue with that stumble, its the timing difference that your feeling, so once you got a transition point that you like, you need to set your timing in the cells of approx 30% to be close to what it may see stock at that point, and you can minimize the stumble..
at WOT, a stumble (surging sensation) can be fuel cut, misfire, or boost cut.. but if you still have stock plugs, I'd guess that its more than likely you need to replace the plugs.
If I recall the stock plugs were either DENSO or NGK, Irridium plugs either way.. If I recall, the 7 range was similar to the stock heat range, but I could be wrong. Just verify it before you buy them.. when you get them, compare the plugs to the stock plug, the insulator (white ceramic part in the center) shouldn't stick out as far as the stock plug. and you can gap them as high as .030 though at that gap I got a bit of misfire, I tightened them to .026 which is .001 larger than stock .025
Apr 11, 2004 | 08:50 PM
#9
FWIW, don't go much higher than 21psi of boost until you can do some other upgrades.. you could be experiencing boost cut at 22.8psi (and of course engine knock, detonation, etc..)
Apr 12, 2004 | 12:47 AM
#10
Thread Starter
Evolving Member
Joined: Jun 2003
Posts: 265
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From: SW PA
I set the threshold to 33%, and I noticed the difference right away. I accidentally broke the tires loose coming out of my driveway. It's much more fun driving around town now 
It's like 32F out, so I figured it would be a good chance to catch this problem in the log, but it didn't happen. Oh, well.
Here's something else weird, I'm not seeing any performance difference between stock mode and map 1. I did a few Gtech runs to compare, and they look almost identical, if anything the map 1 runs seem to hit peak HP a little earlier and fall off earlier, but only by a very small amount. It "feels" exactly the same in stock mode. The dashboard screen showed stock and map 1, so I know the switch was in the right place. Any idea what the heck is going on here? It makes me think that timing might be getting pulled in the top end under map 1, but I'm still not seeing any knock counts. I'm not feeling any stuttering right now either.
It's like 32F out, so I figured it would be a good chance to catch this problem in the log, but it didn't happen. Oh, well.
Here's something else weird, I'm not seeing any performance difference between stock mode and map 1. I did a few Gtech runs to compare, and they look almost identical, if anything the map 1 runs seem to hit peak HP a little earlier and fall off earlier, but only by a very small amount. It "feels" exactly the same in stock mode. The dashboard screen showed stock and map 1, so I know the switch was in the right place. Any idea what the heck is going on here? It makes me think that timing might be getting pulled in the top end under map 1, but I'm still not seeing any knock counts. I'm not feeling any stuttering right now either.
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WarmPepsi
General Engine Management / Tuning Forum
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Oct 2, 2005 09:11 PM
