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SMT-FTX Technical Manual - Protecting The Engine

SMT-FTX TECHNICAL MANUAL

Perfect Power Online Manuals.

 

Support for your SMT-FTX Unit.

PROTECTING THE ENGINE

The unit, like most LETRIPP piggy-backs, has a powerful protection mechanism. The protection is designed to protect the engine against faults (a pipe comes off), abuse or mistreatment. It is nice to have a more powerful engine, but it is equally nice to preserve it in case something goes wrong.


The input to the protection is circuit is:

 

  • RPM
  • AMP
  • Engine Temperature
  • Analog #1
  • Analog #2 (NAFR)

 

The functions the protection circuit can do are:

 

  • CUT         Ignition (CROUT)
  • RETARD    Ignition (CROUT)
  • MODIFY     Analog#1 output
  • Boost control circuit
  • Auxiliary Injector

 

All protection functions, except the CUT, are PROPORTIONAL. That means that the protection modification increases with the amount of limit violation. In addition the time in seconds can be specified in which the limit can be violated before the protection modification takes effect.

 

An example of modification protection would be:
If the engine temperature exceeds a specified point then reduce the TPS (via Analogue #1).

The UNIT has the following protection mechanism. Once a setting is exceeded, the result is routed by ticking items in PROT.MOD SELECT

 

  PROT.MOD SELECT  
Cut Crank signal output Protect Ign Cut  
Cut OEM Injection Protect Fuel Cut  
Retard Crank signal output    
Modify ANALOGUE #1 output Protect A#1 En Protect A#1 Inv
Modify ANALOGUE #2 output Protect A#2 En Protect A#2 Inv
Modify BOOST control output Protect Boost En Protect Boost Inv
Modify    AUXILIARY injection Protect AUX Inj Protect AUX Inv

 

SMT-FTX Fuel Tuner - ShiftF9 - Protection Setup

PROTECTION BY CUTTING

 

CUT Ign.AMP Lim
Should the manifold pressure exceed the limit then the selected signal output is cut after the cut time.

 

CUT Eng.Temp Lim
Should the engine temperature exceed the limit then the selected signal output is cut after the cut time.

 

CUT Rpm Limit
Should the engine Rpm exceed the limit then the selected signal output is cut after the cut time.

 

CUT ANA#1 LIMIT
Should the Analogue #1 exceed the limit then the selected output is cut after the cut time.

 

CUT ANA#2 LIMIT
Should the Analogue #2 exceed the limit then the selected output is cut after the cut time.

 

CUT TIME Seconds
This is the time in seconds after which the limit violation takes effect.

 

 

PROTECTION BY RETARDING

 

RET Ign.AMP Lim
Should the manifold pressure exceed the limit then the ignition timing is retarded gradually after the time and until the ignition retard limit is reached.

RET Eng.Temp Lim
Should the engine temperature exceed the limit then the ignition timing is retarded gradually after the time and until the ignition retard limit is reached.

RET Rpm Limit
Should the engine rpm exceed the limit then the ignition timing is retarded gradually after the time and until the ignition retard limit is reached.

RET ANA#1 LIMIT
Should the Analogue #1 exceed the limit the ignition is retarded after the time and until the ignition retard limit is reached.

RET ANA#2 LIMIT
Should the Analogue #2 exceed the limit the ignition is retarded after the time and until the ignition retard limit is reached.

RET Time Seconds
The time in seconds before the SMT-FTX implements the retard protection.

 

 

PROTECTION BY MODIFICATION

 

MOD AMP Limit
The manifold pressure limit for the protection to kick in.

MOD Eng.temp Lim
The engine temperature limit for the protection to kick in.

MOD Rpm Limit
The RPM limit for the protection to kick in

MOD Time Seconds
The time in seconds before the SMT-FTX implements the protection.

 

 

PROTECTION BY STATUS

SMT-FTX Fuel Tuner - ShiftF11 - Protection Status

A Bold item will indicate that that Protection is active.