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Fuel Injectors

red_triangle.gif (202 bytes) Written by Merlin Johnson

The factory injectors are quite good and are capable of approximately 200hp. They are of the pintelless (how the hell do I spell that?) design, which means more resistance to clogging. To make a long story short, don't screw with em. Don't put a cheap injector cleaner in there, don't take them apart (you can't anyways as they are sealed at the factory), just leave em alone. There are a few companies like R.C. Engineering that claim all sorts of cool things by cleaning your injectors. The SR20DE injectors are hard to clog, are long lasting and usually just dot break. There have been one or two people that have sent their injectors to RCE who then said they balanced them and cleaned them, the only thing RCE can really do is use ultrasound on em to clean them. I really dot think it helped, besides cleaning their injectors. I would say that if your car runs fine, doesn't hesitate (and there are lots of other reasons your SR20 could do this, blame the injectors as a last resort) dot worry about em. Plus the installation can be a bitch if you screw up the rubber seals and dot get a good fit. You will gain nothing as far as HP is concerned by fooling with your injectors if your engine is working properly to begin with or you just dot have the capability to use more than the stock fuel flow.

The stock fuel injectors can probably be pushed to a max flow of about 240-250hp with tons of fuel pressure.

If your after more than 200HP from your SR20 then you have a few expensive options, these injectors are an easy drop in, no need to fool with the fuel rail;

Where from Fuel Flow Approx HP capability@stock PSI
Stock 259cc 200HP
Infiniti Q45 370cc 250HP
Nismo Sylvia 270R 444cc 300HP
Nismo Racing 550cc 370HP

Recently Jim Wolf Technology has fabricated a fuel rail for the SR20 engines that allow the use of Bosch style injectors. This opens up the doors to large and somewhat inexpensive injectors. The ECU code must be changed to allow for the different size injectors.

Fuel injector cleaning

red_triangle.gif (202 bytes) Comments by Wayne Cox

Have R.C. Engineering clean your fuel injectors! It's only a lousy 108 bucks! No, I'm not on their payroll. I can't make any guarantees, but my timeslips from the drag stip immediately went from 16.2 to 15.31, and 7.05 on the trusty VC200 (w. winter traction). No one else here with a non-blown car has been able to show numbers this good. I don't have any explanation for what was "wrong" with my injectors, but my "before" performance and some other probs seem about identical to what everyone else is reporting.

red_triangle.gif (202 bytes) Comments by Fred Miceli

The cleaning at R.C. cost $28.50/injector, totalling $114.00. Then you must pay for shipping both ways (price depends on method of course) and must buy some small bolts (don't use screws), O-rings and insulators. Here is my total bill:

Injector Cleaning $114
O-rings & insulators $39
Bolts/washers $ 7
TOTAL $160

Fuel Injectors and Cleaning with Redline's SI-1 by Larry Weeks
I wrote to Redline to find a local dealer for some products, and asked about the SI-1 injector/valve cleaner. I mentioned the Nissan TSB which states that we shouldn't use injector cleaner. Here's their response:

"The SI-1 will not cause any performance problems in the pintleless Nissan injectors. Nissan believes that with the pintleless design, there is a much less problem with injector deposits and that many fuel injector cleaners actually contribute to intake valve deposits. Red Line SI-1 still will actually help clean intake valve deposits, which can be a major source of driveability problems such as hesitation when accelerating. "