Figured I'd put this in the boost section since I don't think too many people run 60s on an NA motor. This thread is about a different style injector that was brought to my attention by Oldskool. I'll copy what was said on the hptuners forum here for you to read:
Injector Selection.....and reasons why:
The stock injectors are a split pattern dual cone spray injector. There is a huge reason for this, since our motors are a 4 valve design. There is an intake runner splitter right in front of the valves. The proper injector will spray right on the back of both valves for maximum fuel atomization and efficiency....just like the factory injectors does.
Not an LSJ head, but same concept here:
basic spray patterns:
Siemens 60lb Deka specs including spray pattern:
Problem here is most people slap in the Siemens 60 and 80 pound Deka injectors, which are a single pattern cone spray. This intake split is about an inch and a half away from the tip of the injector, so this single 26* cone is spraying right on the split before it is even broader than an inch. This is very very bad, as it causes the fuel to lose its atomization and leads to fuel pooling in the intake as well as very inconsistent transient fueling. This single factor right here is why the idle is so poor with these injectors. Many people tell me they got their car to idle great with these injectors, and I simply have to call bull@!#$. No way you can get this style injector to idle as smooth as stock. You can get them to idle OK with no surging, but not perfect.
The injector I chose is a Bosch EV14 injector, part number 0280158123. You have to use an adapter on the nozzle to make it work, but many injector shops have this adapter. They are slightly longer than 60mm(stock length) at 64.5mm, but I had no trouble since the stock fuel rail is at a 45 degree angle. The spray pattern is a split cone 25* just like the factory injector. They flow 60.5lb/hr @43.5psi, and 72.02@58psi which is close to the stock LSJ fuel pressure. Another good point is the minimum linear pulse width is .711ms, compared to the 1.4 for the Siemens 60's. This is HUGE for our tiny motors, since idle is typically around 1.2, and deaccel is .7ish. My idle is as good if not better than factory right now, and transient fueling is very smooth with these.
More info about the injector I went with:
http://www.bosch-motorsport.de/en-US/literature/en-US/Injection_Valve_EV_14_Datasheet_51_en_2775993867.pdf
Pic of this Bosch injector with the adapter that Fuel Injector Connection makes:
After reading this myself, I decided to give Jon a call at Fuel Injector Connection and grab a set for myself. He knew exactly what I needed and shipped them out to me within a few days. Total cost was 271.60 shipped to my door. I know the Siemens Deka are cheaper but believe me, it's worth the money. The beauty of these injectors is that they are stock length; no cups/spacers necessary to make them fit with the l61 rail. Here is an illustration of that:
(Left, Lucas 42 I was previously running; Middle, GMPP 36 from the l61 SC kit; Left, new EV14 60)
As some of you know, I was running into misfire issues that would throw a random misfire code quite frequently. After countless hours trouble shooting and purchases I had it narrowed down to the 42's I was currently running. I found out that those injectors weren't really rated for a pulse width below 2.0ms. Obviously, that creates idle problems since my car tends to idle more about 1.4ms; not to mention that they have the same cone spray pattern of the Siemens Deka injectors. Here's what I was seeing at idle:
Even at 1.8ms, it was misfiring like crazy. Here's an idle shot I took today on my commute to work:
It should be noted that I run my idle at 1100rpm so those running at 900rpm will likely see the 1.2ms mentioned above. I logged misfire the whole drive today and saw literally 0 misfires. I have to say that these injectors idle as smooth as, if not better than stock. I should also mention that I gained 2 highway mpg after the installation of these injectors despite having more weight in the car than before AND hitting more traffic. I can't wait to see what they can do in the summer.
So,
Pros:
-Stock length
-Stupid low pulse width for very smooth idling (.711ms)
-Correct spray pattern (25* Split Stream)
-Possible increased fuel efficiency
-Large flow rate for boosted applications
Cons:
-Minimeter harness plug requires a custom made harness
-Cost, about 80 bucks more than ZZP's Siemen's Deka for the set (maybe less with shipping)
In my opinion these are the way to go for anyone looking to upgrade to bigger injectors. If you're running the LSJ or GMPP 36lb injectors or even the 42# stage 2 LSJ's, you should be fine. For those looking to buy aftermarket 42's, 60's, 70's, I urge you to stay away from the cheaper old technology and give Jon a call at Fuel Injector Connection for some of these EV14's.
Edited 1 time(s). Last edited Tuesday, December 03, 2013 6:11 AM
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