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
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;
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
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.
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:
Fuel Injectors and Cleaning with Redline's SI-1 by Larry Weeks