Eric Bazan

http://www.maftpro.com/tproinfo.shtml

Just curious if this is good option for us LT1 guys that wanna do a SD tune for our FI'd projects?

Thanks

Eric

dookie454

I've been playing with speed density tune lately with my boosted LT1 and can basically conclude anything under 2bar (~14-15psi) works fine with the stock PCM using a program scaled for 2 bar and a 2 bar sensor.

It all started because my MAF maxed out at 5500rpm and sufferered from high PE Enrichment values (almost maxed around 6200rpm + 7psi) and was wondering what to do to reference boost so went to SD mode one day and realized that was the best thing I ever did.. all PE enrichment are set to 0 with the VE tables correct. Should have switched along time ago. I switched to a 2bar sensor at the same time which makes it the second best thing I ever did.

Not sure if your situation compares but if your interested you can read this overly long thread...
https://www.camaroz28.com/forums/sho...d.php?t=560089

mzgp5x

Question... Could you still run closed loop mode with setting the MAF frequency cal number to maximum (with LT1_edit version 2.2 - Stock 10700 to approx 65000)?

Is there better diveability with SD mode?

Also, I zeroed PE vs. Temp and only use PE vs. rpm on WOT closed loop mode for ease of tuning afr (with a Dynojet WB O2 of course). I had to mod the MAF cal curve (dropped -2%) and BLM update learn trigger to achieve 14.7 afr for closed loop mode @ part throttle cruz (trying to get some gas mileage).

My app... 97ss obd2 383 - D1 pulley/r @ 7.6-->3.4 intercooled + Meth/ h20 M6. Good video. B.

dookie454

well not sure what maxing the MAF values will do I just disabled it in the main screen so it's like it's disconnected.

I noticed much better response going to SD compared to MAF

I didnt like the 1bar boosted setup because there was a "blind" area beyone 100kpa for timing and fuel... I always wondered what 85% throttle would do to the AFR since PE vs RPM is the only table it's using once the MAF is maxed. I also gained timing since now there's not a drastic fall off from 95-100kpa (beginning of boost using the 1bar setup)

To tune the SD tables once the MAF is disabled I ran it, logged it, and used VEMaster to clean up the tables a bit. Now I use the VE tables to richen/lean AFR instead of using the PE vs RPM... much more accurate under all throttle/boost conditions.

My closed loop fine tunes cruise and other part throttle all to 14.7... would def keep closed loop, just not the MAF if it's maxing on you.