I have myself a 1995 Chevy C2500 Suburban, 5.7 TBI, 4L80-E. It has the 427 ECU with BNKM bin in it, $31 mask apparently. I haven't confirmed the bin as compared to the BNKM bins I've found here yet, my APU1, G1 adapter and MTX-L should be here tomorrow or Tuesday.
Currently the Burb has an open air intake, Ultimate TBI mod and a fresh tuneup with Accel parts. Soon to come are Hooker long tube headers with Hooker 2 1/4" full dual and Hooker Comp mufflers... no cats. Later this year the replacement engine I'm currently building for it will be going in. It is a Chevy 207 block .030" over, new pistons, pistons, oil pump, Edelbrock 3702 cam and timing parts. Stock 193 Swirl port heads, port matched and polished, unshrouded intake valves and smoothed chambers. Port matched and polish stock TBI intake manifold. 1.52 Comp roller tip rocker arms, Edelbrock valve springs and retainers. The exhaust and TBI, of course, carry over.
I figure this gives me plenty of time to learn and tweak my bin file with a basically stock setup, and customize some features along the way.
I've been researching and reading for about a week and this is what I 'think' I've learned, along with some questions.
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Fuel (for the coming soon engine)
- I need to increase MAX RPM to 5300 RPM, so I'll be changing 'RPM to Enter Fuel Cutoff' from 4800 to 5300. I'll adjust as necessary one the engine is in if needed. I'll also be changing MAX MPH to 110.
- Updating Culinder Volume from 43.73 to 44.41
..Questions about fuel.
Will I need to tweak the AE tables for TPS and MAP only if I see a drop in AFR or BLM while initially 'dropping the hammer'? I seem to understand the for about the first .1 second the TPS table is in control, then after that for about 2.5 seconds the MAP table kicks in. I imagine the end of the TPS table and the beginning of the MAP table should be close, and that the MAP table should fade as it reaches the end of the table.
The Open Throttle VE vs MAP vs RPM table seems to be my main fuel table. Adjust here as needed across the board?
For PE, there only seems to be one table for fuel, the PE AFR vs RPM, which listed AFR's in the 12's. Does this mean I simply adjust the Open throttle VE table, even for full throttle operations?
After all is said and done, I should adjust the idle screw on the TBI to keep idle counts in P/N to under 5. Right?
I see there are MAT tables in bin, but the Burb has the MAT or IAT sensor. Can this be added for more precise fuel/spark control?
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Spark -
- Looks like I need to adjust the Main Spark Table vs MAP vs RPM (Open throttle) for all my spark control. Yes?
- There is a PE Spark vs RPM table, but it is all 0's, so I assume it relies mostly on the Open Throttle table?
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Transmission (4L80-E)
The only shift timing table I can find is the Desired Shift Time Altitude Gain vs TPS vs Shift. I assume this is the main shift timing table and I should make my adjustments here for a quicker shift.
I also would like to be able to make 3rd gear hold while on a dyno. Should I change the value in the Upshift/Downshift MPH vs TPS in the 3->2 column to 127 mph?
Kickdown Mode looks like its the 'floor it' mode for the transmission, checking parameters to see if it should drop a gear or increase line pressure, etc. True?
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Air conditioning
It seems pretty straight forward that I need to change the Idle Speed vs Temp (A/C On, P/N) table to increase RPM so the A/C gets colder quicker when I hit the remote starter in the summer. I wouldnt increase more than 150 RPM, just enough to help the compressor.
In the bin I see that A/C Clutch Control is disabled, and there is an entire collection of Parameters/Tables for controlling the A/C for various throttle/RPM conditions. However, they are all 0's. I assume if I wanted to use these tables I would need to switch them on, then populate all the tables with proper values.
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Shift RPM/MPH
It looks like the ECU is set to shift based on MPH only. the RPM shift tables are all at 0. As far as I can tell, I would simply need to set the proper RPM in those values to increase shift RPM when the new engine goes in.
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Sorry, I know its a lot of questions, but I think I'm getting a decent idea of what needs to be done, without having the equipment to experiment yet.
Thanks for looking
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