Fuel Injector Kits for Alfa Romeo
These injectors fit the engine with NO modifications. They fit the stock GTV6, Milano, and Spider fuel rail and injector mounts. We have them in various flow rates to handle any possible Alfa application. The most commonly needed sizes are listed below but we have sets to handle anything up to 600 hp!
We have these injectors custom made when you order them. You will get a fresh injector that has not been sitting on the shelf for years.
Allow 2-4 weeks for delivery.
The old L-Jetronic system is an analog fuel injection system. This means it has no software to chip, flash, or reprogram. It can not take advantage of the mass air flow conversion kits out there as they only work on digital systems. With an old analog system like L-Jetronic, it's all in the hardware. For years those of us wanting to change the fuel curves on L-Jetronic cars had few choices. One popular choice was sending the ECU to a specialist for adjustments. This cost about $400 and involved a certain amount of risk to the ECU as the units are very delicate when they are apart. Hairline cracks in the boards and loosened solder joints were common on these boxes. The worst part was you had to send it back in every time you made a big change to the motor. Finally someone has an inexpensive and ADJUSTABLE solution.
Our new product allows excellent control of the fuel system. It DOES NOT make L-Jet as good as a modern injection system like Gotech, SDS, Motec, etc. However it does allow enough control over the fuel curve to handle about 5 pounds of boost with stock fuel injectors and 10 pounds with Stage 2 injectors.
If you want to avoid the hassle of upgrading to modern injection. Or you just feel comfortable with the reliability of the stock injection system then this product is for you.
Two factors can be adjusted. You can control exactly when the system signals the ECU to send in more fuel and you can alter how much extra fuel is added. The amount of fuel is not infinitely adjustable however we include 25 settings which will provide enough range of adjustment for almost everyone. The device on my car is set to trigger at 5500rpm and adds enough fuel to handle 10 pounds of boost on my 2.5 with Stage 2 injectors. Without the device the car starts to lean out at 5500 rpm and would be dangerously lean by 6000 rpm. Now at 5500 the car accelerates noticeably harder and the mixture stays in line up to 6500+ rpm.
Installation is simple and only requires one wire on the car to be cut. It does not require removal of the ECU, soldering or anything else. It's very small and can be hidden anywhere. Even in plain view nobody notices it.
At this time I have only completed testing of the forced induction version. I have not tested the normally aspirated version and they DO NOT interchange.
Question 1. Are your injectors as good as the originals?
Answer 1. They are much better. They have stainless steel bodies and better nozzles. Most importantly you can get them in flow rates high enough to support virtually any Alfa V6.
Question 2. If I don't need more fuel flow, can't I just have my original injectors rebuilt.
Answer 2. Nope. There is no such thing as a rebuilt Bosch injector. The two most critical components in the injector are the internal seal and the coil and they can not be replaced. At least one major rebuilder does nothing but clean them and it says so in the fine print on their website. The best rebuilders clean them and replace the tips and inlet screens. It makes a lot more sense to buy new ones.
Question 3. Ok, what injector should I use for a 2.5 with aftermarket injection and 164S cams.
Answer 3. Stage 2ms are ideal. Any bigger is a waste of money.
Question 4. I need more fuel flow, can't I simply raise the Fuel pressure.
Answer 4. Sort of. There are a few problems with that. First of all it takes a big increase in pressure to make a small increase in fuel flow. Raising the GTV6's fuel pressure to 40 PSI only adds about 1 pound per hour of fuel flow. If you raise it above 40 the injection system will spray in more fuel but it looses efficiency. This happens because as you raise the pressure the fuel coming out of the injector it sprays farther. On the Alfa V6 if the pressure exceeds 40 psi the bottom of the spray cone strikes the bottom of the intake port causing the fuel vapor to liquefy. That's why Alfa Romeo, BMW and other L-Jetronic users altered fuel flow by changing duration and by using different sized injectors. They did not make significant changes to fuel pressure to control fuel flow!
Question 5. I have a 3.0 with 11:1 compression race cams and headers and L-Jetronic what injectors should I use.
Answer 5. Stage 2s.
Question 6. What flow rate is injector X?
Answer 6. First I want to say that when comparing flow rates it's VERY important to note the fuel pressure at which the injector was tested. Most injectors have flow rates published for fuel pressure about 44 psi. Some are higher. All of our flow rate numbers are for factory GTV6/Milano fuel pressure which is 36.5 psi. Obviously at higher fuel pressure the flow numbers would be higher so please take that into account when comparing my injectors to others. I know of no other vendor that flow checks injectors at correct GTV6/Milano fuel pressure. We have them flow checked at 36.5 psi and checked for leakage and quality at much higher pressures.
Stock injectors flow rate = 17.6 pounds per hour (pph) @ 36.5 psi, Stage 1 L jet injectors = 17.6 pph @36.5 psi, Stage 2 L jet injectors 23.8 pph @ 36.5 psi, Stage 2M 22.9 pph @ 36.5 psi, Stage 3M 28.6 pph @ 36.5 psi.
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