8th Generation Honda Civic Forum - View Single Post

vtecmike1 · 03-29-2009, 10:21 PM

since your turbo.. i'd go with either rc 650cc injectors or the modified honda 520's.
the rc 650's have 0 issues. they run great. in fact since you are turbo's i'd prob recommend the RC 650's. they are expensive but wonderful and leave you room to improve. should be a nice low duty cycle for you as well. if and when you decide to go past 300whp and go for more. a walbro fuel pump and the 650's would let you do it.

ninja edit: whatever route you decide. different injectors should require a new tune.

Hondata wrote:

"There have been some reports of misfires and lean areas at high RPMs with JR superchargers for the RSX.

These problems all seem to be mostly associated with:

- 550 Injectors

Here is my opinion.

When testing the European Civic Type R supercharger we found a regular misfire would occur at a set RPM. This misfire would occur at the same RPM every time.

To cut a very long story short - after several months we found the misfire was the result of the combination of:

- The spray pattern of the 550 injectors
- The position of the 550 injector
- The speed of the blower (related to pulley size)
- The angle of the camshaft (VTC)

Altering any of these would alter the RPM at which the misfire would occur. We surmise that the fuel from the fuel injector was being blown backwards and (possibly) into another cylinder. We know the fuel is blown backwards as we have seen nice circular clean spots on the back of the JR manifold. Reversion also happens in NA engines. This is not unusual.

The fuel we suspect is being blown the wrong way as a result of the pulses coming from the blower at a particular speed interacting with the reversion pulses from the cylinder.

The easiest solution was to run 650 injectors which have a more diffuse spray pattern and inject the fuel over a shorter time period.

It would appear that a switch to 650 or 750 injectors will solve the problem. We would also suggest a fuel pump upgrade if you are nearing 300hp."

i suspect they don't work too well with turbos either.

hope i could be of some help.

03-29-2009, 10:21 PM	#26 (permalink)
vtecmike1 Senior Member Join Date: Nov 2007 Location: Simi Valley Age: 27 Posts: 3,950 Mike	since your turbo.. i'd go with either rc 650cc injectors or the modified honda 520's. the rc 650's have 0 issues. they run great. in fact since you are turbo's i'd prob recommend the RC 650's. they are expensive but wonderful and leave you room to improve. should be a nice low duty cycle for you as well. if and when you decide to go past 300whp and go for more. a walbro fuel pump and the 650's would let you do it. ninja edit: whatever route you decide. different injectors should require a new tune. Hondata wrote: "There have been some reports of misfires and lean areas at high RPMs with JR superchargers for the RSX. These problems all seem to be mostly associated with: - 550 Injectors Here is my opinion. When testing the European Civic Type R supercharger we found a regular misfire would occur at a set RPM. This misfire would occur at the same RPM every time. To cut a very long story short - after several months we found the misfire was the result of the combination of: - The spray pattern of the 550 injectors - The position of the 550 injector - The speed of the blower (related to pulley size) - The angle of the camshaft (VTC) Altering any of these would alter the RPM at which the misfire would occur. We surmise that the fuel from the fuel injector was being blown backwards and (possibly) into another cylinder. We know the fuel is blown backwards as we have seen nice circular clean spots on the back of the JR manifold. Reversion also happens in NA engines. This is not unusual. The fuel we suspect is being blown the wrong way as a result of the pulses coming from the blower at a particular speed interacting with the reversion pulses from the cylinder. The easiest solution was to run 650 injectors which have a more diffuse spray pattern and inject the fuel over a shorter time period. It would appear that a switch to 650 or 750 injectors will solve the problem. We would also suggest a fuel pump upgrade if you are nearing 300hp." i suspect they don't work too well with turbos either. hope i could be of some help. Last edited by vtecmike1; 03-29-2009 at 10:25 PM.