Tutorials

[Bruce Melton]

Maybe in flowchart format?
Assume an untuned engine with lots of new untuned components.
Start with idle>setting LTrims>correcting a/f ratios> etc ???
If the steps were numbered, follow on tips and proceedures could be referenced to the sequence.

As a rookie, it seems we lack a logical sequence from start to finish. There are many pieces to the process but they are not formatted or keyed to proceedure which could prevent unintended consequences in subseqent steps.

[mnotx]

A complete explanation of acronyms (pinned) might be something good for the Tutorial topic. I still vapor-lock on some of the acronyms.

[bink]

A complete explanation of acronyms (pinned) might be something good for the Tutorial topic. I still vapor-lock on some of the acronyms.

Some Acronyms from various sources :

PCM - Powertrain Control Module
ECM- Engine Control Module
DTC – Diagnostic Trouble Code
SES – Service Engine Soon light
DLC – Data Link Connector
MAP – Manifold Absolute Pressure
CKP – Crankshaft Position
CMP – Camshaft Position
COT- Catalytic Converter Overtemp
TP – Throttle Position
TPS – Throttle Position Sensor
IAC – Idle Air Control
IAT – Intake Air Temp
ETC – Electronic Traction Control
ECT – Engine Coolant Temperature
LTFT – Long Term Fuel Trim
LTRIMS - Long Term Fuel Trims
LTerms - Long Term Fuel Trims
STFT – Short Term Fuel Trim
VSS – Vehicle Speed Sensor
O2 / HO2S – Heated Oxygen Sensor
PE – Power Enrichment
TB - Throttle Body
WOT- Wide Open Throttle
MAF- Mass AirFlow sensor (measures amount of air entering intake)
DFCO- Deceleration Fuel Cut Off
EGR- Exhaust Gas Recirculation (emissions system)
PCV- Positive Crankcase Ventilation
CAGS- Computer Assisted Gear Selection
H/C - heads/cam
LSA- Lobe Seperation Angle
A/F - air/ fuel ratio
AFR- Air - Fuel Ratio
PW - PulseWidth
RAF- Running AirFlow
Inj. PW- Injector PulseWidth
IFR- Injector Flow Rate
EQ - Equivalence Ratio
KR- Knock Retard
CR - Compression Ratio
AIR - Air Injection Recirculation
F/I- Forced Induction
N/A- Naturally Aspirated
RWHP- Rear wheel horsepower
RWTQ- Rear wheel Torque
BHP- Brake Horse power
HP - horsepower
SC - Supercharger
TQ - torque
TC- Torque Converter
VATS - Vehicle Anti Theft System
VE- Volumetric Efficiency
T56- actual part name for the M6 transmission
A4- 4-speed automatic transmision
4L60E- part name for the A4 transmission
LQ4- iron block, LS1-based 6.0L truck engine
MN6 - Code for factory 6-speed transimission cars.
MN12 - Code for factory 6-speed Z06 transimission cars.
VIN - Vehicle Identification Number

[mnotx]

Perfect. Now I can add to this list as new acronyms come up. I appreciate your help. Some of us part timers don't deal with tuning enough to have these memorized.

Thanks!

[bink]

Perfect. Now I can add to this list as new acronyms come up. I appreciate your help. Some of us part timers don't deal with tuning enough to have these memorized.

Thanks!

Here is a good source of solid, basic tech info -> http://www.autoshop101.com/

:idea: The .pdf tech articles are excellent. :idea:

[Steve Bryant]

Joel,

I've just scanned a couple of the technical articles and I agree, they are excellent! I don't know how I've missed them in the past.

On another subject, did you get your Corvette running again? I wrote you a PM recently to ask if you'd gotten a chance to try out your FlashScan yet and you said that your car was down for a while. Also, I'm still interested to know if you've gotten a chance to work with Version 7 of EFILive and FlashScan yet.

All my best,

Steve

[bink]

Hi Steve,

Nah...car is still apart. Just the exhaust and FJO setup though. Lots of snow here lately - I learned my lesson in the snow last year!!

Lessons ->

1.) Vette is very squirrely in a few inches of snow - too much fun!!!
2.) No matter how badly you want to try and scan/tune - sometimes you are better off leaving the car parked. :(

[bink]

Although these books are not LS1/LS6 specific I've found them helpful in theory and practice.
They are not pro level but they have been very helpful at my level (amateur/tinkerer).

"Engine Management -optimising carburettors, fuel injection and ignition systems"
by Dave Walker. Haynes High Performance tuning series.

"How to Tune and Modify Engine Management systems"
by Jeff hartman. Motorbooks Workshop

"Building and Tuning High-Performance Electronic Fuel Injection"
by Ben Strader. S-A Design, CarTech Books

"Tuning Accel/DFI 6.0 Programmable Fuel Injection"
by Ray T. Bohacz. HPBooks

General Engine Info:

"Introduction to Internal Combustion Engines"
by Richard Stone. SAE International

Hope these help some.

[Steve Bryant]

Thanks Joel. They all look like good reads.

Steve

[tdzee]

Steve

I very much like your idea of the primer. I do understand FI engine management and have modded my firts Vette with a DFI PCM. Having some experience wth tuning, and some technical understanding of FI engine mgmt, I would like a step by step for the user which suggests what tables to edit in order, based on car mods. For my 02Z, I am about to install LT headers, hi flow cats, hi flo muffler, Vararam and FAST intake. Already dynoed (with my volant intake), I am runnig at 12/10 LTFT and know I am running rich (around 11 at WOT). I believe that I shoud start by trimming back the VE tables to lean it our a bit (to get the LTFT close to zero). However, shoud I lean the whole tabel, or just at high throttle/load? I need some practical input.

Any and all help appreciated. When will you post first draft of your primer?? Thanks