I would like to know the flow rate and type of injector (i.e. peak & hold vs. saturated) according to the model year for Prelude injectors.

When did the injectors stop using the resistor box and what year did the flow rate decrease?

Thanks.

-kenji

 

milky man,

92-95 h22a are 370cc injectors and are peak/hold requiring resistor pack. other 92-95 honda and DSM injector plug fit these injectors.
in the 96+ they were 310cc and because saturated, and fits the 96+ obd2 plugs.

Greg

 

Kenji:

RC Engineering tested my USDM 5G (97+) Prelude injectors. They tested at 290cc/min and are saturated (no resistor box required).

Someone here (forgot his name...sorry), tested a set of JDM 4G Prelude injectors (92-96) and they came back at 360cc/min and are peak and hold (resistor box required).

I have not personally tested a set of USDM 4G Lude injectors, but most of the info I've gathered on them rates them at 330cc/min, peak and hold.

RC checks their injectors at 3bar of fuel pressure and 100% duty cycle (injector held wide open). For reference, my 2000 Civic Si injectors came back as 240cc/min. So, I think it's safe to conclude that Honda tests them this way as well.

Sonny


[Modified by Sonny, 12:51 PM 8/23/2002]

 

Thanks for the info Mr. Banker Man and Sonny.

Let me ask you guys one more question. I have heard a rumor (and I feel it is incorrect) that the unused plug on an OBD1 and OBD2 DOHC VTEC engine harness from an Integra that is on the passenger side shock tower can be made to accept an injector resistor box.

I know that the unused plug has 8 yel/blk wires which are all 12v switched.

I don't think this is true but I have not tested or looked at anything extensively.

Anybody have an HANDS ON experience to share? (no guessing please)

Thanks.

-kenji

 

ttt

 

OBD 1 lude injectors flow at 345cc. Peak and hold. Well mine do at least.
OBD 2 290cc saturated

 

93-96 (all 4th gen) Prelude injectors are Peak and Hold and rated at 310cc. However, as others have pointed out, they seem to flow around 350cc or more in actuality when flow tested. These all use the injector harness resistor pack.

97+ (all 5th gen) Prelude injectors are Saturated and rated at 290cc. Saturated injectors are high impedance already and do not use a resistor pack.

Andrew


[Modified by aklucsarits, 12:45 PM 8/26/2002]

 

These would be H23 and H22 injectors?

 

Kenji:

I know of the plug that you're talking about. On the 2000 Civic Si, it's actually located on the bottom side of the intake manifold. It's very difficult to access in that position.

When I did the saturated -> peak-and-hold conversion for my car, Doug from Hondata asked me to use that plug, but I didn't/couldn't because of its location. My car was JRSC equipped at the time which made it even more difficult to access.
I ended up just taking the 4 injector power wires and running them into the input side of the resistor pack. Then I ran the 4 output wires of the resistor pack to the injectors.

If you go to Hondata's site and look in the Tech section, you'll see a resistor pack installation on an OBD1 Integra. I believe that installation makes use of the plug that you are talking about. I am pretty sure that the picture came from a Hondata customer car, so maybe you can contact Hondata and they will refer you to the person who installed their resistor pack that way.

Sonny

 

No. H23 injectors are considerably smaller than the ones found on H22As. (240cc maybe?) 92-96 H23 injectors are also all peak and hold style.

Andrew

 

Thanks Sonny.

Here is the link for future reference:

http://www.hondata.com/techinjectorwiring.html


-kenji


[Modified by kenji, 5:02 AM 8/27/2002]