Originally Posted by Red Lion
Choroplast (corrugated plastic) is the popular choice among most Eco Modder guys - it's cheap, flexible, easy to cut and somewhat rugged.
I did the upper grill block on my Sentra, it wasn't too bad, it helped a little at highway speeds. Lots of guys do aero mods, but aero really only helps at highway speeds (50+). There's lots of little mods to do, like inflating your tires to their maximum psi, leaning out your air/fuel ratio (or running a WAI instead of a CAI since it basically leans out your AFR in a round-about way) and of course lightening the car as much as possible (take out your spare tire and tools and other shit when you're driving around the city).
The easiest thing you can do though is modify your driving habit. I'm currently driving a car rated at 18mpg getting 24+ solely on driving habit.
Mmmm, I haven't found any local sign shops that sell choroplast sheets yet. And the FRP sheets are like ~$30. My OE wheel liners are still fully intact so I just need to worry about making a functional and semi aesthetically pleasing under pan for the front and rear.
Once I get a baseline with all these new mods installed, (rear disc, your bushings/motor mounts, 5-lug, and new wheels/tires) I'll start this project. I usually run my tires at 40 PSI and I try and keep the trash in my car to a minimum. I also recently removed the jack and spare since I had a leak in the trunk, which is now fixed, but the spare is useless since it's 4 lug.
I already try and keep the RPM's around 2000-2500 when accelerating around town to keep my exhaust down and to try and help my mileage a bit. What sucks is there's really no middle ground here for speed limits. I'm either driving through heavily patrolled residential areas or I'm driving on 40+ multi-lane roads.
The EPA calls for 20/28 and 23 mixed for the 01 which is probably due to the shorter gearing in the 00-01's. I'm hoping to bump that to mid to high 20's for city and mid 30's for highway. Maybe a bit unrealistic but we've all gotta have goals in mind.
I also plan on starting to add the 2 stroke marine oil consistently again. I used to do it but never kept track of the results. For those who have no clue what I'm talking about wait for my next reply. I've gotta dig up a few threads on the subject.
I also want to get my E-Mance harness converted over to a 95 pinout at some point and run a tuned ECU finally. There's gotta be some power and mileage to be gained with an N/A tune. I also need to check my timing and advance it/run premium in the mean time. I also need to pick up a proper sized grommet and actually plug the IAT sensor into my CAI. As it sits right now it's just hanging there.
Lastly, for shits and giggles do you happen to have any pics of the Sentra with the grille block?