diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 19c52baf81..e5733e98fc 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -47,10 +47,10 @@ var (
 
 	MaxForkAncestry  = 3 * params.EpochDuration // Maximum chain reorganisation
 	rttMinEstimate   = 2 * time.Second          // Minimum round-trip time to target for download requests
-	rttMaxEstimate   = 20 * time.Second         // Maximum rount-trip time to target for download requests
+	rttMaxEstimate   = 5 * time.Second          // Maximum rount-trip time to target for download requests
 	rttMinConfidence = 0.1                      // Worse confidence factor in our estimated RTT value
-	ttlScaling       = 3                        // Constant scaling factor for RTT -> TTL conversion
-	ttlLimit         = time.Minute              // Maximum TTL allowance to prevent reaching crazy timeouts
+	ttlScaling       = 2                        // Constant scaling factor for RTT -> TTL conversion
+	ttlLimit         = 5 * time.Second          // Maximum TTL allowance to prevent reaching crazy timeouts
 
 	qosTuningPeers   = 5    // Number of peers to tune based on (best peers)
 	qosConfidenceCap = 10   // Number of peers above which not to modify RTT confidence