LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Open or Closed Loop?

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Old Jun 26, 2012 | 08:32 AM
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Default Open or Closed Loop?

Just finished building and breaking in the new engine. It's a 381 forged stroker, TFS heads, and a LE cam 242/248, 58x lift on a 110 LSA.
I have done minimal tuning so far and the cam surge in closed loop sucks. Question is; Is the cam too big to run in closed loop? I dont' want to waste a million hours tuning just to find out open loop is the way to go instead of closed loop.
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Old Jun 26, 2012 | 10:28 AM
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Originally Posted by Mystery Bird
Just finished building and breaking in the new engine. It's a 381 forged stroker, TFS heads, and a LE cam 242/248, 58x lift on a 110 LSA. http://www.youtube.com/watch?v=I-A8b...3&feature=plcp I have done minimal tuning so far and the cam surge in closed loop sucks. Question is; Is the cam too big to run in closed loop? I dont' want to waste a million hours tuning just to find out open loop is the way to go instead of closed loop.
That cam is not big at all, need more tuning or check to see how the O2's are reacting in CL
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Old Jun 26, 2012 | 10:51 AM
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Yeah, I have only done an intial tune of where I think it should run, O2's are new and appear to be working fine when logging data.
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Old Jun 26, 2012 | 12:59 PM
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On your fueling hits with Data Master, are the cells white, green or red..
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Old Jun 26, 2012 | 02:29 PM
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LT counts I assume? Are you asking for a particular cell?
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Old Jun 26, 2012 | 03:09 PM
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Originally Posted by Mystery Bird
LT counts I assume? Are you asking for a particular cell?
No, all the cells in general, if the cells are white then it could be something else, if the cells are red or white then the IFR might need to be adjusted for CL.
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Old Jun 26, 2012 | 03:37 PM
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what are you using too tune?
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Old Jun 26, 2012 | 04:04 PM
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Originally Posted by jay7199
what are you using too tune?
Tunercats
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Old Jun 26, 2012 | 04:05 PM
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Originally Posted by jay7199
what are you using too tune?
I use LT1 Edit to tune and Data Master to scan..
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Old Jun 26, 2012 | 04:11 PM
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Car sounds good Mystery Bird, What exhaust? I need to get my car a tune, I have a 96 and the jett cable I was borring crapped out :/
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Old Jun 26, 2012 | 06:01 PM
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Originally Posted by moehorsepower
No, all the cells in general, if the cells are white then it could be something else, if the cells are red or white then the IFR might need to be adjusted for CL.
I was looking at the log and it's not long enough to be a good indicator. Anyway cell 7 is the worst, green 150's, the rest that did show up showed blms to be pretty close. I will have to do some good logging this weekend along with some idle tuning. But you think it can be tuned for closed loop?

Originally Posted by jay7199
Car sounds good Mystery Bird, What exhaust? I need to get my car a tune, I have a 96 and the jett cable I was borring crapped out :/
Hooker LT's, matching ORY, no cat, 3in pipe back to Borla 40474 muffler, and a cutout right before axle.
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Old Jun 26, 2012 | 06:41 PM
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Closed loop for the street. Open loop for the strip.

That is, of course, if you tune your car for maximum performance for the strip and tune it like a carb.
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Old Jun 26, 2012 | 07:12 PM
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My last setup I did all my WOT tuning at the track and picked up a good 2-3 tenths over the mail order tune.
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Old Jun 27, 2012 | 07:23 AM
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[QUOTE=Mystery Bird;16458620]I was looking at the log and it's not long enough to be a good indicator. Anyway cell 7 is the worst, green 150's, the rest that did show up showed blms to be pretty close. I will have to do some good logging this weekend along with some idle tuning. But you think it can be tuned for closed loop?



Of course, The only cars I tune open loop are motors with huge solid roller cams, sheet metal intakes and even some of those are still CL. Your setup is mild and not radical enough to have to run in OL..
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Old Jun 27, 2012 | 10:06 AM
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Originally Posted by moehorsepower
Of course, The only cars I tune open loop are motors with huge solid roller cams, sheet metal intakes and even some of those are still CL. Your setup is mild and not radical enough to have to run in OL..
I'm glad to hear that. I'm diving in head first this weekend. Thanks moe
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