318 2bbl to 4bbl: Is it worth it this time?
I got 20 MPG Hwy. in my 360/904/2.76 rea with 26 inch tires Dodge Magnum.
If a 318 can't do it in an A body, you ethier need to go back and tune that baby up or replace the engine or trans cause something aint workin right.
The T-Q should be the smaller primary unit. Get ahold of Demonsizzler for tuning jets. (And advice on a T-Q carb to look for. I don't know if a smogger T-Q would be OK) Advance the timing some and a great MPG netter would be a MSD or equal. The multi spark really helps in mileage.
Between the smaller primary of the T-Q and multi spark, you'll gain mileage. If you had a 2.76 gear out back, you would do really well.
I had one of the old style MSD boxes on the car, the old type that you hook the existing wiring pigtail and connector from the original ecu. Its a simple plu in and play type, not requiring any wiring. It must be a mopar specific box. The why I took it off is because after I hooked up the tach to the coil, I would get erratic inaccurate readings after 5 minutes of run time. Took the box off and am running the stock ecu and the tach works fine. Its a shame, as it ran smoother, cleaner, and did get slightly better mpg with the MSD box.
I noticed a small plug in section on the opposite side of the box. Could this be where the tach lead that normally connects to the coil should go??? How can I get the tach to work normally with the box?
As far as milage, its a combined total. My hemi charger with cylinder deactivation gets 17 mpg mixed over a full tank. I seriuosly doubt that the teen will do better than that. Maybe 20 mpg on the highway, I know I am getting near that, but as an entire tank average, mixed driving, between 14-15 mpg total average at best.
The car is not driven hard unless needed, always under 3,000 rpm, except for freeway driving, which at 65, is right at 3,000 with 235/60/14 tires.
Timing is advanced as far as possible with it on the ragged edge of detonation. I just tuned it up too with plugs and wires. Believe me, its tuned well, with the exception of the carb.
The motor is 20,000 miles old, along with the trans, and has great oil pressure, even ridiculously high, 90 lbs when cold, 75 warm on highway.
Any other suggestions??