Went for a drive with the powerlogger earlier today. I wasn't able to make a strong third gear pull because it had been raining but I did get on it hard for a few seconds near the end of the recording. Let me know what you guys think. I will be ordering a wideband soon.
My first powerlogger file. How do things look?
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SCOOBY DOO
BASED CANADIAN PATRIOT!!
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Your battery voltage at WOT is 12.0-12.3. Time to check your charging system. Your IDC is 90%...but that could be caused by low voltage...not enuf fuel causing a strain on the injectors. 27 lbs of boost is giving those 42's a workout too.
The only thing I noticed in addition to the above, is your IAC is too high. Let the engine warm up then log a minute or two at warm/hot idle. Your chip goes into closed loop ~148 degF (depends on start temperature) and starts learning ~154 degF. If you can log before and after the C/L switch point, then post the log we can look at the IAC count.
Will do. I believe the iac has been about 25 at idle. I will double check the iac and tps settings. I do not have a volt booster but the alternator and battery are both less than a year old. I have a caspers field fix harness installed. The only reason I haven't gotten a volt booster is because I read that the additional voltage would mess with the alky pump? It sounds like I need a volt booster. I saw that it showed 27lbs boost, my autometer boost gauge shows 23lbs. I've read that other people have noticed boost reading high on the powerlogger as well but I couldn't find any answers. Bad ground to the map sensor maybe? I'm pretty confident that the boost gauge is accurate but I could be wrong. I have an rjc boost controller and have not stretched the spring. Thanks guys, great info. It might be next weekend before I can record another log.
I installed the volt booster and turned the boost down 2 psi then went for a drive. Voltage is now 15.5v at wot. Boost on the gauge was showing approximately 22 psi although still higher on the powerlogger. O2 millivolts were 800-810 so I could see that it had richened up. I pulled 10% wot fuel from the chip then made a data log. Let me know what you guys think. I also recorded a data log at idle after the drive. Thanks for all the input.
SCOOBY DOO
BASED CANADIAN PATRIOT!!
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- Feb 18, 2007
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If it were me...and if I planned on running any higher boost...then I'd jump up to a larger injector.
Wouldn't the Walbro/hotwire pump you have deliver enough fuel so that you wouldn't need a volt booster? I had a volt booster, but I took it off cause it ran my alky pump to hard causing big time overly rich condition. Guess, I could turn the alky pump speed down and equal things out, but I didn't.
I'd rather keep my alky set-up the same and just run my external fuel pump to supply the injector enough fuel. I think you need bigger inj. like said above.
I'd rather keep my alky set-up the same and just run my external fuel pump to supply the injector enough fuel. I think you need bigger inj. like said above.
I noticed the IDC is still up around 80%. I'm glad to see it improved some. What is an ideal # for IDC at wot? Somewhere in the mid range I would assume? I'm way ahead of you on the larger injectors. I've put in an order for 60lb injectors and a 6.1 TT chip, LC-1 wideband and LS1 maf and translator.
Ratfink. Mine ran rich too. o2's were normally 780's and jumped up over 800. I was told not to turn down the alky but to pull fuel from the chip. I removed 10% at wot and the o2's are now back like before. My best understanding is that alky is for controlling detonation, NOT correcting a rich or lean condition. Control air/fuel through the chip and use the alky to eliminate knock. If I'm wrong someone please correct me.
Thanks for all the help guys.
I just looked at the hot idle log and your IAC is at 60 - 70 at 800 rpm. It should be more like 20 - 30 at 800 rpm idle. Clean the IAC if it needs it, then adjust it and the TPS. (The IAC adjustment affects the TPS setting.)
I'm not used to seeing the IAC cycle up and down like yours does at a steady rpm. Perhaps there is another issue (vacuum leak, ??) that the ecm is trying to correct via the IAC. In any case, it should lower because when you give it gas, the IAC does a thing called "throttle follower" where the IAC count increases as the %TPS increases. If the IAC starts at 70 then say, 60 or more are added for the throttle follower then the total is approaching the max IAC position. If it starts at a lower number, you'll have more range.
I'm not used to seeing the IAC cycle up and down like yours does at a steady rpm. Perhaps there is another issue (vacuum leak, ??) that the ecm is trying to correct via the IAC. In any case, it should lower because when you give it gas, the IAC does a thing called "throttle follower" where the IAC count increases as the %TPS increases. If the IAC starts at 70 then say, 60 or more are added for the throttle follower then the total is approaching the max IAC position. If it starts at a lower number, you'll have more range.
I don't see where you are seeing a high iac count at idle... Are you sure you weren't looking at the other log? I just figured out that I could right click and change parameters on the powerlogger graphs but there isn't an option to graph the iac. Everywhere I look it's between 23-26 at idle.
I'm looking at the file: idle hot after road test.dat
Load the log file into PLC, click on the Data tab, use the right arrow key on the keyboard to scroll through the log.
On the left is IAC Cts. For the entire log the count never goes below 60, with the TPS at 0.42V and RPM ~ 800.
Load the log file into PLC, click on the Data tab, use the right arrow key on the keyboard to scroll through the log.
On the left is IAC Cts. For the entire log the count never goes below 60, with the TPS at 0.42V and RPM ~ 800.
Well, I'll be damned - my PLC program is broken. Your IAC is fine, its my PLC that's not. I loaded a fresh one and the IAC values are in the 20's as you've been saying all along.
Thank you for helping me discover the real problem. Its weird because all the other numbers are ok. (??)
I owe you a beer.
Thank you for helping me discover the real problem. Its weird because all the other numbers are ok. (??)
I owe you a beer.
So I guess that's what they mean by a "win - win situation".
I make my own chips and if you hadn't helped me catch the problem, I would have totally hosed the idle control portion based on my whacked out IAC numbers. Thanks again.
Oh no kidding. Glad you figured that out too! Like I said, it also forced me to train myself on the PLC. This weekend I installed the 6.1 wideband chip, 60lb injectors, LC-1 wideband and LS1 maf and standard translator. Went for a little cruise to learn the chip but didn't get on it yet. Chip is on default 10.8 afr. How's this log look?
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