Efficient Engine Design ???

[Christ]

Greasemonkee - Have you seen the archives? There was a whole series on the soft heads discussion in HR mag.

I'm trying to find those issues as we speak (have been for quite some time) but they're hard to get ahold of, cuz HR wasn't ever a popular collector mag.

Frankly, if I had the chance, I'd love to have more than an email conversation with Widmer, but I really don't think I could keep up. He's LEAGUES ahead of anything I've done/seen/participated in, and the conversation would be entirely one sided.

NaturalExtraction - I'm a little more liberal about what I say now that I've been here awhile, but there are alot of things that I've noodled about that just don't belong on this forum, or I don't feel like discussing them here would be practical or effective. If there's ever anything that you'd like to discuss of that sort, feel free to PM me. I've given that invitation to a few members here, such as Pgfpro.

[orange4boy]

This forum never ceases to amaze me.

Great thread. Over my head, but then that's how we learn, right.

Subscribed!

[Christ]

Originally Posted by orange4boy

This forum never ceases to amaze me.

Great thread. Over my head, but then that's how we learn, right.

Subscribed!

No, no... it's complexically simplistic.

[orange4boy]

You guys are pursuing the Possimpible. Where the possible and impossible meet.

[TheEnemy]

How do you trick the ecm into running so lean?
How do you switch for more power when you want/need it?

[Christ]

pgfpro - regarding #6 goal in your OP on this thread - You should pay close attention to Daox, as he's working on a variable control EGR setup as we speak.

(Ok, he's probably sleeping as we speak, but you get the point.)

[pgfpro]

Originally Posted by TheEnemy

How do you trick the ecm into running so lean?
How do you switch for more power when you want/need it?

I'm running Neptune engine management. I write all my own the values. I never run in closed loop. I tell what I want my ECU to do. The O2 sensor is nothing more then a gauge now along for the ride.

The list of controls I have.

ROM Feature ListROM Features
*Fuel/Ignition Maps
Primary and Secondary Maps Primary and Secondary low and high cam fuel and ignition maps.
8 maps total.
24 load breakpoints by 24 rpm breakpoints for precise tuning.
Low and high cam both can be scaled to go to 11000 and above

*Rev Limits/VTEC
Fuel And/Or Ignition Cut
High and Low Cam Rev Limits: Low cam rev limit doubles as a cold limit
High and Low Load VTEC Engagement RPMs: Separate engagement RPMs for low and high load
TPS threshold: decides low/high load This option decides whether to use the low or high load engagement RPM
Minimum load for engagement: This option only allows VTEC to engage above the specified load
Disengage below minimum load: When VTEC is engaged this option determines whether or not to disengage below the minimum load or disengage below the set engagement RPM
VTEC Disable: For Non-VTEC setups
VTEC Speed Threshold: Disable Allows VTEC to activate at launch or on setups without a VSS
VTEC Temperature Threshold Disable: Allows VTEC to activate while the car isn’t fully warmed up
VTEC Pressure Disable: For setups without a VTEC Pressure switch
VTEC Error Check Disable: Only suggested for race vehicles

*Corrections
New and old injector size:Can be used with the overall trim to rescale for new injector sizes
Overall Fuel Trim:Globally applied fuel correction
TPS Tip-In Fuel Trim Correction:to accurately tune TPS Tip-In for different size injectors and different setups
Cranking Fuel Trim: Fuel correction for Raw Cranking Fuel Maps
Post Start Fuel Trim Correction: for fuel delivered immediately after startup
Adjustable ECT vs Raw Cranking Fuel Maps:Used to determine how much fuel is used to start the engine
Adjustable ECT vs Fuel Enrichment Maps:Used for cold start enrichment
Adjustable ECT vs Ignition Correction Maps:Used for cold start correction
Adjustable IAT vs Fuel Enrichment Maps: Complete fuel correction for weather changes
Adjustable IAT vs Ignition Correction Maps:Ignition correction for intake temperature
Adjustable Gear Based Fuel Enrichment Maps:Allows balancing of air/fuel ratios between different gears
Adjustable Gear Based Ignition Correction Maps:Can be used as an aid for traction
Adjustable Individual Cylinder Fuel Trim:Allows adjustments to fuel to obtain equal individual cylinder EGTs and more
Adjustable Individual Cylinder Ignition Trim:Allows adjustments to ignition to obtain equal individual cylinder EGTs and more
Battery Compensation Trim:Allows adjustments to fuel based on battery voltage

*Idle
Target Idle:
ECT vs Target Idle maps:Fully adjustable ECT and target idle values for the startup idle maps
IACV Duty Cycle Adjustment: Allows adjustment of IACV duty cycle to help you reach your target RPM

*AC Cutoff
Above RPM:
Above TPS threshold:
Idle Recovery Disengages the AC clutch below this RPM to help regain control over a low idle

*3-step
Activation by MPH:No need for a clutch switch!
Activation by TPS:threshold Rev until any RPM you choose, cross the TPS threshold and it holds that RPM
Activation by switch/clutch switch:Can be used to turn 2-step on/off or used as a clutch input
MPH threshold for 2-step:Can help limit you off the line to keep traction under control
Ignition Retard/Fuel Enrichment:Allows you to build boost off the 2-step
TPS threshold for retard/enrichment:Allows you to pre-stage on the 2-step before building boost
Full Throttle Shift:Holds the target RPM during shifts. Requires use of a clutch input
Selectable clutch switch input:Several inputs to choose from to fit what’s available

*Outputs (2)
Activation Input: Not required for activation but can be used as an on/off switch
Activation Output:Several outputs to choose from
Minimum RPM:
Maximum RPM:
Minimum Load:
Maximum Load:
Minimum speed:
Minimum Throttle Position:
Minimum Intake Air Temperature:
Maximum Intake Air Temperature:
Minimum Engine Coolant Temperature:
Maximum Engine Coolant Temperature:
Ignition Retard Retards ignition when activated:
Fuel Enrichment Adds fuel when activated
Switch maps on activation:Ability to use secondary maps to completely tune for nitrous

*Boost Control For use with dual, tri, and quad stage boost controllers
Activation Input:Not required for activation but can be used as an on/off switch
Activation Output:Selectable outputs for each stage of boost
Minimum RPM:
Minimum speed:
Minimum Throttle Position:
Boost Cut Keeps you from going over a determined safe level of boost
PWM Based Boost Control:
Variable Frequency For Multiple Solenoid Types:
Set Duty:
Boost By Gear:
Boost By Gear vs RPM:
Low/Hi Boost Switch Input:

*Fan Control Allows full control of what temperature the fan is activated
Activation Output:
Minimum Engine Coolant Temperature:

*Switch Maps
Flexible Dual Map Setup Primary and secondary maps can be setup to use MAP or TPS as load reference.
Load and RPM breakpoints can be completely different. Can be used for extending load points/rpm breakpoints, alpha-n scaling, pump/race tunes, etc
Activation Input Not required for activation but can be used as a switch between the different maps
Minimum RPM:
Minimum Load Optional setting:, can be disabled. For use with maps extending onto the secondary maps
Minimum Throttle Position Optional setting:, can be disabled. For use with Alpha-N scaling for ITB tuning
Use High Cam Maps Only:Can be used to tune VTEC setups using one set of maps only

*Closed Loop Control
Target O2 Voltage:Can be changed to work with a widebands 0-1v linear output
Disable Closed Loop Above Load: Beneficial to small turbo and supercharged setups that build boost even at partial throttle
RPM vs TPS Threshold:Gives access to the maps that govern the stock closed loop routines
Disable Closed Loop Optionisables closed loop completely
Disable Open Loop Lookup Table Option: Disables enrichments from the open loop lookup table
ECT Threshold For Open Loop Table:Use The temperature that the Open Loop Lookup Table starts being applied

*Sensors and more
Disable Knock Sensor:
Disable Injector Test Circuitry:Many EDM/JDM ECUs do not have this
Disable BARO Sensor:Many EDM/JDM ECUs do not have this
Disable ELD
Disable O2 Heater:Allows use of 1 wire O2 sensor or no O2 sensor if Closed Loop is disabled:
Disable IACV Error:For vehicles that don’t have an IACV hooked up
Disable IAB:
IAB Activation RPM:
MAP Sensor Support:Support for a wide range of map sensors from stock up to 5 bar and beyond via custom map settings

The switch for more power comes from the fuel timing tables based off of load. Light load it reads the lean burn values heavy load it reads stoichiometry values. Heavy load in boost 0-35psi it reads anywhere from 13.5 A/F with 20* timing to 11.5 A/F 10* timing.

[pgfpro]

Originally Posted by Christ

pgfpro - regarding #6 goal in your OP on this thread - You should pay close attention to Daox, as he's working on a variable control EGR setup as we speak.

(Ok, he's probably sleeping as we speak, but you get the point.)

I have been watching his progress. It looks promising.

[pgfpro]

Made a little progress today.













I got the up pipe all tack welded and ready to tig.

Cut the inner hood bracing and made clearance for the comp. housing to fit and the hole for the up-pipe.

Started the template for the stainless steel bezel.

[Christ]

That pipe is ridiculous. Clearly, you're insane. I like.