94 VX 1000 mile tank @ 80 MPG

[ultimx]

Just fyi, battery current is really important for injectors to function correctly, this is in reference to your alternator delete.

[Daox]

Long term fuel trim can easily compensate for the lower voltage. Many people use alternator deletes to improve fuel economy. Not that boosting voltage back up is a bad thing, there have been tests shown that say that it does improve fuel economy as well (as long as it doesn't have to come from the alternator).

[rwhyde]

Thanks for you detailed list of Mods, this is an awesome response that will be immensely valuable. I need to get out to my garage and get to work.
From What I have read, lowering the vehicle reduces the size of the hole that it punches through the air so you should benefit in reduced frontal area. NASCAR takes this to the extreme of the rules. They also believe that stopping air from moving under the car at all is beneficial and try to duct it around the vehicle as much as they can. The Honda' benefit from a very nicely sloped front end which eases the airflow over the vehicle.

[The donkey CRX]

Thanks for your comment. What should I be looking for to know if the injectors are not performing correctly?

So far on my 54 mile commute, the lowest voltage I have seen is 12.4. This is when I am going to the shop early in the morning and burn the headlights the entire trip. I know the Honda ELD allows the voltage to drop to 12.5 when the amp draw is lower than 10 amps, so I was assuming that 12.4 volts would not be too harmful to the car.

I installed a high quality fuel pressure gauge on my 92 RED VX prior to using the alternator delete on it to see if it would change the fuel pressure as the voltage dropped during my commute. I have never seen any changes in the pressure as the voltage dropped from 12.9 to as low as 12.2 on my red VX. The pressure always fluctuates based on throttle position from 30 psi at off throttle to as high as 42 psi at WOT.

With only the engine running and no accessories, I am drawing about 8 amps. As I get over 55 MPH, the amp draw increases to a little over 9 amps and never increases from there.

I have installed all LED lights on the White VX including the headlights. This has lowered my amp draw from 12.5 amps to 6.5 amps for all lights.

This means that on my regular commute of 54 miles ( 1 hour and 20 minutes) I use about 12 amps hours with no lights on and about 20 amp hours with the headlights on the entire trip. I am only using about 20% of the capacity of the 100 amp hour deep cycle battery during the trip. When I get to the shop and turn off the car the battery resting voltage returns to around 12.7 volts. It takes less than 2 hours for the on-board 25 amp battery charger to bring the battery back to 100%.

I hope this will give you the information you need for you to give me your opinion of were I may be effecting the injectors. Thanks.

[The donkey CRX]

Thanks for the information on voltage and injectors. I have not "seen" any changes in this area from the alternator delete, but would welcome any knowledge that will improve my MPG.

I have tried to build my alternator delete so it will not stress the capacity of the battery or do any harm to the car.

[The donkey CRX]

Hope this motivates you to work on your car. This site and all the great information provided by many posters is what got us going on making more MPGs with all our cars.

Good luck !!

[echo-francis]

where did you find your hotstart circulating heater?

[The donkey CRX]

Hi Francis, My brother was able to get this one on E-Bay for less than $200 dollars. One year ago this item listed for $700 direct from Hotstart, but prices seem to be getting more reasonable lately. There are several different voltage models (240 and 120 volts). Make sure you get one that will work best for you.

[COcyclist]

Originally Posted by The donkey CRX

So here are the major modifications and my opinion of the MPG benefit of each:

14 X 5 1/2 HX wheels with Bridgestone RE 92 low rolling resistance tires. 7 or 8 MPG improvement over "regular" 13 inch tires.

Thank you for listing these mods out for us. I am amazed at the mpg difference between LRR and "regular" tires. I'll have to try them when my tires wear out.

Great looking car and very nice workmanship.

[echo-francis]

Originally Posted by The donkey CRX

Hi Francis, My brother was able to get this one on E-Bay for less than $200 dollars. One year ago this item listed for $700 direct from Hotstart, but prices seem to be getting more reasonable lately. There are several different voltage models (240 and 120 volts). Make sure you get one that will work best for you.

where to you see the prices? i cant find any price

BTW, very nice project