I have a decent log of some around town driving and a few small pulls, it was shutoff twice during the logging for various stops.
http://www.filedropper.com/datalog1
I have a decent log of some around town driving and a few small pulls, it was shutoff twice during the logging for various stops.
http://www.filedropper.com/datalog1
syn, 1st as stevo said make sure your intake path after the MAS is tight. I run a mild LT4 hot cam on my '94 LT1, (218/228 @50 112LSA , .525/.525 lift w/the 1.6 RR's) . I had to get my idle up to 800 in 'N' to hold a MAP of about 55 kpa at idle. Your desired idle setting is still stock @ 550 and your resultant MAP is 76 kpa . When the poster above previously said 'you may have overdone it) I think it was referring to cam size. If I were you I concentrate on getting idle cleaned up by cranking up idle RPM to increase vacuum as much as possible, watch the ST trims and MAP as you play with idle. Make sure the IAC counts are controlling your idle (not the TB) as the IAC distributes air flow more evenly to all cylinders. Since I'm an A4 my in gear idle is 750 and a stall converter solved the problem of holding the car back at idle in gear. If you get idle straightened out then remember the BLM cell selection and timing tables all use MAP and RPM for correct selection, data logging and analysis will help getting them set up. If A4 shift points should be set to your new CAM power curve. What cam are you running ??
Last edited by bobdec; 04-27-2019 at 05:05 PM. Reason: spelling
I'm Bob 1994 Z28, A4, CAI, Cam, 1.6RR's, LT's, stall, cat-back, TunerCat $EE, TunerPro RT, TTS Datamaster. Also 2007 GMC Envoy mail order tune , 2015 Kia Sorento stock..
The cam in my Express van degrees out at 218/228 @ .050 with the 1.7 rockers. 110 LSA on a 106 ICL. 0.578/0.578 lift. Idles at 700 rpm @ 60 kpa in Drive. In Park it idles at 750 rpm @ 52 KPA. It has 215cc intake ports. I would also play with adding timing where the engine idles. I idle about 30° of timing. Up from the factory 22-23° a stock L31 idles at. Stock engine idled at 550 rpm and about 40 kpa in Park and 45 in Drive. On the newer GM stuff with HP Tuners you can adjust the timing real time at idle and watch the MAP KPA drop as you fall into what the engine likes. Go too far and it skips at idle for a lack of a better description. I am using the stock factory high stall 4L80E converter that brake stalls about 2,500 rpm. Hydroboost brakes on my setup so idle vacuum is largely irrelavant. It will idle all day long with the a/c on at 700 rpm and 65 kpa. When I hit the throttle from a stop it is at 2,500 rpm instantly and I shift WOT at 6,200.
Last edited by Fast355; 04-27-2019 at 05:36 PM.
Yea, I forgot that "Closed TPS Spark Advance" table, my stock was at 20* for 400-800 RPM, I found setting 400-1200 at 34* and moving other settings up a few degrees as RPM increased helped smooth out the TPS closed-to-open transition in my setup. As a sidebar.. $EEHack 'Control' tab shows some real-time timing alteration (+/- 5*) , I've never used it.
I'm Bob 1994 Z28, A4, CAI, Cam, 1.6RR's, LT's, stall, cat-back, TunerCat $EE, TunerPro RT, TTS Datamaster. Also 2007 GMC Envoy mail order tune , 2015 Kia Sorento stock..
Cam size is .230/.230 @50 with .480/.480 lift, and i will look for leaks as soon as im able to. and where im new to tuning im not sure what to look for in the tune. I do have tunercats so i am able to change just about anything computer wise. but im still attempting to learn what i "Need" to change.
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