diff --git a/src/k_kart.c b/src/k_kart.c
index de8d3e004..74ad3e658 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -2992,15 +2992,14 @@ INT16 K_GetSpindashChargeTime(player_t *player)
 fixed_t K_GetSpindashChargeSpeed(player_t *player)
 {
 	// more speed for higher weight & speed
-	// Tails = +6.25%, Fang = +20.31%, Mighty = +20.31%, Metal = +25%
+	// Tails = +18.75%, Fang = +46.88%, Mighty = +46.88%, Metal = +56.25%
 	// (can be higher than this value when overcharged)
-	const fixed_t val = (player->kartspeed + player->kartweight) * (FRACUNIT/32);
+	const fixed_t val = ((player->kartspeed + player->kartweight) + 2) * (FRACUNIT/32);
 
 	// TODO: gametyperules
 	return (gametype == GT_BATTLE) ? (4 * val) : val;
 }
 
-
 // sets boostpower, speedboost, accelboost, and handleboost to whatever we need it to be
 static void K_GetKartBoostPower(player_t *player)
 {
@@ -3085,7 +3084,7 @@ static void K_GetKartBoostPower(player_t *player)
 
 	if (player->startboost) // Startup Boost
 	{
-		ADDBOOST(FRACUNIT/2, 4*FRACUNIT, 0); // + 50% top speed, + 400% acceleration, +0% handling
+		ADDBOOST(FRACUNIT, 4*FRACUNIT, sliptidehandling/2); // + 100% top speed, + 400% acceleration, +25% handling
 	}
 
 	if (player->driftboost) // Drift Boost
@@ -7291,6 +7290,8 @@ static void K_LookForRings(mobj_t *pmo)
 */
 void K_KartPlayerThink(player_t *player, ticcmd_t *cmd)
 {
+	const boolean onground = P_IsObjectOnGround(player->mo);
+
 	K_UpdateOffroad(player);
 	K_UpdateDraft(player);
 	K_UpdateEngineSounds(player); // Thanks, VAda!
@@ -7562,8 +7563,10 @@ void K_KartPlayerThink(player_t *player, ticcmd_t *cmd)
 	if (player->strongdriftboost)
 		player->strongdriftboost--;
 
-	if (player->startboost)
+	if (player->startboost > 0 && onground == true)
+	{
 		player->startboost--;
+	}
 
 	if (player->spindashboost)
 	{