diff --git a/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkPairDetector.cpp b/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkPairDetector.cpp
index 1a561957368..8af16b9cf6f 100644
--- a/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkPairDetector.cpp
+++ b/extern/bullet2/src/BulletCollision/NarrowPhaseCollision/btGjkPairDetector.cpp
@@ -254,20 +254,21 @@ void btGjkPairDetector::getClosestPointsNonVirtual(const ClosestPointInput& inpu
 			}
 #endif //
 			
-			m_cachedSeparatingAxis = newCachedSeparatingAxis;
 
 			//redundant m_simplexSolver->compute_points(pointOnA, pointOnB);
 
 			//are we getting any closer ?
 			if (previousSquaredDistance - squaredDistance <= SIMD_EPSILON * previousSquaredDistance) 
 			{ 
-				m_simplexSolver->backup_closest(m_cachedSeparatingAxis);
+//				m_simplexSolver->backup_closest(m_cachedSeparatingAxis);
 				checkSimplex = true;
 				m_degenerateSimplex = 12;
 				
 				break;
 			}
 
+			m_cachedSeparatingAxis = newCachedSeparatingAxis;
+
 			  //degeneracy, this is typically due to invalid/uninitialized worldtransforms for a btCollisionObject   
               if (m_curIter++ > gGjkMaxIter)   
               {   
@@ -294,7 +295,7 @@ void btGjkPairDetector::getClosestPointsNonVirtual(const ClosestPointInput& inpu
 			if (!check)
 			{
 				//do we need this backup_closest here ?
-				m_simplexSolver->backup_closest(m_cachedSeparatingAxis);
+//				m_simplexSolver->backup_closest(m_cachedSeparatingAxis);
 				m_degenerateSimplex = 13;
 				break;
 			}
@@ -303,7 +304,7 @@ void btGjkPairDetector::getClosestPointsNonVirtual(const ClosestPointInput& inpu
 		if (checkSimplex)
 		{
 			m_simplexSolver->compute_points(pointOnA, pointOnB);
-			normalInB = pointOnA-pointOnB;
+			normalInB = m_cachedSeparatingAxis;
 			btScalar lenSqr =m_cachedSeparatingAxis.length2();
 			
 			//valid normal
diff --git a/extern/bullet2/src/BulletDynamics/Vehicle/btRaycastVehicle.cpp b/extern/bullet2/src/BulletDynamics/Vehicle/btRaycastVehicle.cpp
index 345dca6a11c..5b467883d84 100644
--- a/extern/bullet2/src/BulletDynamics/Vehicle/btRaycastVehicle.cpp
+++ b/extern/bullet2/src/BulletDynamics/Vehicle/btRaycastVehicle.cpp
@@ -698,7 +698,7 @@ void	btRaycastVehicle::updateFriction(btScalar	timeStep)
 					btVector3 sideImp = m_axle[wheel] * m_sideImpulse[wheel];
 
 #if defined ROLLING_INFLUENCE_FIX // fix. It only worked if car's up was along Y - VT.
-					btVector3 vChassisWorldUp = getRigidBody()->getCenterOfMassTransform().getBasis().getColumn(1);
+					btVector3 vChassisWorldUp = getRigidBody()->getCenterOfMassTransform().getBasis().getColumn(m_indexUpAxis);
 					rel_pos -= vChassisWorldUp * (vChassisWorldUp.dot(rel_pos) * (1.f-wheelInfo.m_rollInfluence));
 #else
 					rel_pos[m_indexUpAxis] *= wheelInfo.m_rollInfluence;
diff --git a/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.h b/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.h
index 586e75d2d00..51e00b9111f 100644
--- a/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.h
+++ b/source/gameengine/Physics/Bullet/CcdPhysicsEnvironment.h
@@ -125,7 +125,11 @@ protected:
 		virtual void		debugDrawWorld();
 //		virtual bool		proceedDeltaTimeOneStep(float timeStep);
 
-		virtual	void		setFixedTimeStep(bool useFixedTimeStep,float fixedTimeStep){};
+		virtual	void		setFixedTimeStep(bool useFixedTimeStep,float fixedTimeStep)
+		{
+			//based on DEFAULT_PHYSICS_TIC_RATE of 60 hertz
+			setNumTimeSubSteps(fixedTimeStep/60.f);
+		}
 		//returns 0.f if no fixed timestep is used
 
 		virtual	float		getFixedTimeStep(){ return 0.f;};