Tag: Fuel Injection

From my calculations, based upon the current PC800 fuel pump putting out 36 liters of petrol in an hour, I need to get injectors that are rated for about 30 lb/hr or greater.  There are some Delphi 30 lb injectors for sale on DIY Auto Tune for $50/each.  I know I want high Z injectors to minimize current requirements.  This also means they’ll be saturated injectors.  The next size up of injector that DIY Auto Tune carries is a 37 lb model that is marine grade.  The anti-corrosion properties would be useful although that big of an injector might be too big.  The fuel pump that I have on the way would be able to support the larger injectors although unless I have a turbo or some other form of forced air, I probably wouldn’t need to be injecting that much fuel.

I’m not sure if I want a conical spray pattern that will probably deliver superior atomization or if I want a dual squirt gun pattern that will be able to be directed to hit both intake valves.  Both would have their benefits.

Summit Racing has several types of injectors for around $35 each in the right general size category.  For instance, the FAST 30332-1 would be about the right size.  The ACCEL 150132 at 336cc/min would be about right, too. I’m not sure if there is a big difference in quality between brands or not though. I’m willing to pay a little more for a better injector that will last longer and be easier to use on this project.

Unrelated to injectors… I think I am going to go for the Mega Squirt II so that I am ready to expand to full spark control after I get fuel injection squared away. I also think I will spend the extra couple of bucks to put a knock sensor on my engine.

Wide band oxygen sensors and controllers are a difficult bunch of products to figure out.  Some sources I’ve read claim that I don’t need one and shouldn’t spend the money on it.  Other sources say it’s absolutely necessary if I am to achieve a decent tune.  Also a wide band O2 sensor can lead to closed-loop control which helps improve economy for cruising.

Strangely, the MegaSquirt products only support narrow band O2 sensors natively.  Otherwise, you have to have a separate controller for the wide band sensors to work with the MegaSquirts.  There used to be a DIY board available but it seems to have fallen by the wayside.  Now the main two options that are available seem to be the Innovate LC-1 and 14Point7.  The 14Point7 would end up costing less although there seems to be more readily available support for the Innovate LC-1.  Also the LC-1 is a smaller package that would more easily be installed and appears to be weatherproof.  On the high end, I will be out $209.  On the low end, about $150.  Is the extra 50 or so bucks worth the DIY AutoTune support?  Also there are a lot of people using the LC-1 successfully…

The temperature sensors I need for my project are readily available through NAPA and elsewhere.  It’s cheaper to get them there than on EBay or elsewhere.  The GM Part number is 15326386.  They are $11.99 each if I want to wait for them to be shipped in or $12.99 to pick them up today.  I will need two.  One will be a coolant temp sensor and the other an ambient air temp sensor.  I can get the connectors for these sensors with GM part number 12162193 and 12103881 (first is connector, second is terminal).  On EBay the connectors are about $2.50 each and the terminals are $5 for a pack of 25.