If my calculations are correct, the Cougar fitted with the 4.5 Final Drive would top out around 129MPH ... a 14MPH drop. The higher the Final Drive number, the lower your top speed, but the higher your acceleration rate. This means better 0-60/corner exiting, but slower top end. It places the engine at a higher RPM though, thus consuming more fuel at highway cruise speeds. Cruising at 3,000 RPM's in 5th gear now equates to cruising at 3,000+ RPM ... requiring more gas = lower MPG. Expect much better acceleration, but terrible gas milage.
I was trying to get the car to have optimal gearing for the drag, and every now and then a auto-x run.
I was looking to have 4th gear reach 100-105mph (max) at 7000rpm. This would basically have me run through every gear 1-4 staying in the powerband after every shift.
I figured on a 55, 65, or 75 shot I wouldnt make it past maybe 105mph, and NA probably not past 95mph trap speeds on the 1/4. So I get full use of each gear pulling all the way though. with the 4.5 on a stock gear set people have seen a solid .3 drop of 1/4 mile times (in contours). With the slightly shorter gearing to follow, I should hopefully drop another tenth, and with proper tires and some weight reduction, I should be pulling off mid 14's all day with no problems. Add the N2O and some hardcore tires...and I'd like to drop into the mid 13's.
Should make for a fun NA and N2O powered car...
And my engine won't be taking much of a beating from heavy mods at all times. I spray very very very rarely.
My tranny and the install of the internals were done by Leo. And we even had dinner with him and his wife in Las Vegas last week. Was nice to finally meet him after speaking to him on the phone almost like daily. He ROCKS btw...
A forum community dedicated to New Edge Mercury Cougar owners and enthusiasts. Come join the discussion about troubleshooting, builds, ZETEC, maintenance, performance, modifications, classifieds, and more!