diff --git a/lib/Openledrace-lib/olr-lib.c b/lib/Openledrace-lib/olr-lib.c
index 37d9e45..5b6b289 100644
--- a/lib/Openledrace-lib/olr-lib.c
+++ b/lib/Openledrace-lib/olr-lib.c
@@ -62,40 +62,28 @@ void process_aux_track( track_t* tck, car_t* car ){
 
 void process_main_track( track_t* tck, car_t* car ) {
     struct cfgtrack const* cfg = &tck->cfg.track;
-    const int nled = cfg->nled_main;
-    const byte* gmap = tck->gmap;
-    if ( gmap[(word)car->dist % nled] < 127 )
-        car->speed -= cfg->kg*(127-( gmap[(word)car->dist % nled]) );
-    if ( gmap[(word)car->dist % nled] > 127 )
-        car->speed += cfg->kg*(( gmap[(word)car->dist % nled])-127 ); 
+    
+    if ( tck->rampactive ) { 
+        struct cfgramp const* r = &tck->cfg.ramp;
+        int const pos = (int)car->dist % cfg->nled_main;
+        if ( pos >= r->init && pos < r->center )
+            car->speed -= cfg->kg * r->high * ( pos - r->init );
+        
+        if ( pos <= r->end && pos > r->center )
+            car->speed += cfg->kg * r->high * ( pos - r->center ); 
+    }
 
     car->speed -= car->speed * cfg->kf;
     car->dist += car->speed;
 }
 
 void init_ramp( track_t* tck ) {
-    struct cfgtrack const* cfg = &tck->cfg.track;
-    byte* gmap = tck->gmap;
-    for( int i=0; i<cfg->nled_main; i++ ) { 
-        gmap[i] = 127; 
-    }
+  tck->rampactive = true;
 }
 
-void set_ramp( track_t* tck ) {
-  struct cfgramp* r = &tck->cfg.ramp;
-  for( int i=0; i<(r->center - r->init); i++ )
-      tck->gmap[r->init+i] = 127-i*((float)r->high/(r->center - r->init));
-  
-  tck->gmap[r->center] = 127;
-  
-  for( int i=0; i<(r->end - r->center); i++ )
-      tck->gmap[r->center+i+1] = 127+r->high-i*((float)r->high/(r->end-r->center));
-
-  r->enabled = true;
-}
 
 bool ramp_isactive( track_t* tck ) {
-  return tck->cfg.ramp.enabled;
+  return tck->rampactive;
 }
 
 
diff --git a/lib/Openledrace-lib/olr-lib.h b/lib/Openledrace-lib/olr-lib.h
index efc4049..9ae8a03 100644
--- a/lib/Openledrace-lib/olr-lib.h
+++ b/lib/Openledrace-lib/olr-lib.h
@@ -57,7 +57,7 @@ typedef struct {
   struct cfgparam cfg;
   int ledcoin;      //LED_SPEED_COIN
   uint32_t ledtime;
-  byte* gmap;       //pointer to gravity map
+  bool rampactive;
 }track_t;
 
 
diff --git a/lib/Openledrace-lib/olr-param.c b/lib/Openledrace-lib/olr-param.c
index c10142f..6f1e40d 100644
--- a/lib/Openledrace-lib/olr-param.c
+++ b/lib/Openledrace-lib/olr-param.c
@@ -6,7 +6,7 @@ void param_setdefault( struct cfgparam* cfg ) {
     cfg->ramp.init   = 90;
     cfg->ramp.center = 100;
     cfg->ramp.end    = 110;
-    cfg->ramp.high   = 12;
+    cfg->ramp.high   = 2;
 
     cfg->track.nled_total = MAXLED;
     cfg->track.nled_main  = 300; //240
diff --git a/lib/Openledrace-lib/olr-param.h b/lib/Openledrace-lib/olr-param.h
index cde1d92..30f3012 100644
--- a/lib/Openledrace-lib/olr-param.h
+++ b/lib/Openledrace-lib/olr-param.h
@@ -15,7 +15,7 @@ extern "C"{
 
 enum{
   LEN_UID = 16,
-  CFG_VER = 2,
+  CFG_VER = 3,
 };
 
 
@@ -35,7 +35,6 @@ struct cfgramp  {
   int center;
   int end;
   int high;
-  bool enabled;
 };
 
 struct brdinfo {
diff --git a/src/open-led-race.ino b/src/open-led-race.ino
index 034fa78..1f64a95 100644
--- a/src/open-led-race.ino
+++ b/src/open-led-race.ino
@@ -39,7 +39,7 @@
 
 
 enum{
-  MAX_CARS = 2,
+  MAX_CARS = 4,
 };
 
 
@@ -104,7 +104,6 @@ enum loglevel verbose = DISABLE;
 static struct race race;
 static car_t cars[ MAX_CARS ];
 static controller_t switchs[ MAX_CARS ];
-static byte  gravity_map[ MAXLED ];
 static track_t tck;
 
 static int const eeadrInfo = 0; 
@@ -143,18 +142,14 @@ AsyncSerial asyncSerial(data, dataLength,
 
 Adafruit_NeoPixel track = Adafruit_NeoPixel( MAXLED, PIN_LED, NEO_GRB + NEO_KHZ800 );
 
-void init_track( track_t* tck ){
-  param_load( &tck->cfg );
-  tck->gmap = gravity_map;
-  init_ramp( tck );
-}
+
 
 void setup() {
 
   Serial.begin(115200);
   randomSeed( analogRead(A0) + analogRead(A1) );
   setup_controller( );
-  init_track( &tck );
+  param_load( &tck.cfg );
   
   init_car( &cars[0], &switchs[0], COLOR1 );
   init_controller( &switchs[0], DIGITAL_MODE, DIG_CONTROL_1 );
@@ -177,7 +172,7 @@ void setup() {
   track.begin();
 
   if ( digitalRead( DIG_CONTROL_1 ) == 0 ) { //push switch 1 on reset for activate physic
-    set_ramp( &tck );    
+    init_ramp( &tck );    
     draw_ramp( &tck );
     track.show();
   }
@@ -453,9 +448,19 @@ void draw_car( track_t* tck, car_t* car ) {
 }
 
 void draw_ramp( track_t* tck ) {
-    struct cfgtrack const* cfg = &tck->cfg.track;
-  for(int i=0; i< cfg->nled_main; i++)
-    track.setPixelColor(i, track.Color(0,0,(127-tck->gmap[i])/8) );
+    struct cfgramp const* r = &tck->cfg.ramp;
+    byte dist = 0;
+    byte intensity = 0;
+    for( int i = r->init; i <= r->center; ++i ) {
+      dist = r->center - r->init;
+      intensity = ( 255 * (i - r->init) ) / ( 2* dist );
+      track.setPixelColor( i, track.Color( intensity,intensity, 0 ) );
+    }
+    for( int i = r->center; i <= r->end; ++i ) {
+      dist = r->end - r->center;
+      intensity = ( 255 * ( r->end - i ) ) / ( 2* dist );
+      track.setPixelColor( i, track.Color( intensity,intensity, 0 ) );
+    }
 }
 
 
@@ -576,7 +581,7 @@ ack_t parseCommands(AsyncSerial &serial) {
     if( err ) return ack;
     EEPROM.put( eeadrInfo, tck.cfg );
     
-    set_ramp( &tck );
+    init_ramp( &tck );
     ack.rp = OK;
     if ( verbose >= DEBUG ) { //VERBOSE
       struct cfgramp const* cfg = &tck.cfg.ramp;