Originally Posted by Zerocyde
Are you saying AirGap + Thumpr is bad all the time or just in cold weather? Truth be told I'd rather lose the thumpr than the airgap, but I'm not the most knowledgeable about this stuff yet. It just feels like I could probably find a cam that gives me just as much power as the thumpr does but with less annoying tuning and driving issues.
The valve overlap of the Thumper can compound the tuning problems the AirGap can cause.
May be fine in Warm/Hot weather but a nightmare when it gets cold.
Final Tranny ratio = 5th/OD ratio.