so while fixing my EGR valve, i read the honda service manual and the hemls and read up on al things EGR related.........

those EGR Blockoff plates claim to be a cheap way to free up a few more hp..... but i submitt they are worthless and here is why.

they way the egr works is that when you are at cruzing or low speeds, the EGR conrtrol soleniod will apply vaccume to the EGR valve which will lift the pin inside the vavle allowing exhause gasses back into the block lowering the engine temp and reducing emissions........

well, it is only open at a constant or low rpm... durring accel or high rpms it is closed and no gasses get reused....... so how would blocking off the EGR vavle help? if you are trying to gun it at 2000-2500 rpm, i think you need to learn how to drive...... (excluding certain launch situation, you may be in that rpm range for a 1/8 of a second in first gear)

so, i guessi would say invest your $40 in something that will actually be noticed..... maybe a better air filter or something...... i dont see how the EGR blockoff plate will help you ever.....


Modified by 92blkJDMh22 at 2:46 PM 10/2/2006

 

uhhh yep.

 

The only reason I see to block them off anyway is just so you have one less potential problem.

 

Are you trying to be logical about some mods? C'mon, you can gain neck snapping acceleration by bastardizing your car in so many ways. Don't try to see through the hype.

 

well i got my plate for free... and it cleans up the engine bay alot, cause u can take off all the **** on the side of the motor too.

 

Have you ever seen your intake manifold or head inside? I have... A lot of carbon **** hard as a stone. Everything covered... I had my fingers cut badly to clean that. EGR blockoff plate = but not for hp but cleaniness.

 

and cleaness overtime=hp=

 

oh..... hit redline once a day and your engine will stay clean....

 

"they way the egr works is that when you are at cruzing or low speeds, the EGR conrtrol soleniod will apply vaccume to the EGR valve which will lift the pin inside the vavle allowing exhause gasses back into the block lowering the engine temp and reducing emissions"

Maybe I'm wrong here but how does hot exhaust cool the engine?

 

it creates a lower temp combustion by not allowing as much pure air into the chamber...... the more oxygen there is, the hotter the burn.....

see.....


example (and i am just making up these numbers, the concept is the same, but the acutall temps may varry)

pure air comes in and the air fuel mix reaches 550 degrees durring combustion.....

hot exhaust gasses are added to the mix and the combustion only burns at 460 degrees as there is not as much oxygen in the mix......

 

If you do use the EGR block off plate do you get a CEL for it?

and if so, are there ways around it? Like tricking the ECU thinking that it is there...?

 

i think the general and scientific answer for OBD1 is...... you might..... you might not......

it seems to be 50/50 and i have yet to understand why it would be random....

 

it comes on during certain driving conditions. aprox. 40-60mph constaint speed, about 2-15%thorttle, and its more likely to come on when there is a heavier load on the motor (going up a hill)

 

i would personally do it just for engine bay cleanliness. Just makes it look nicer and easier to work on.

 

I have my EGR Blocked and it has deffinetly kept my exhaust mani much cleaner. If you unplug the egr then you will get a CEL unless you mod your ECU. The ecu only checks to see if your egr is there and plugged in... so mine is...

BTW I still get 30-33, sometimes 35 MPG w/ out the EGR on the highway

 

OBD1 only cares that it is plugged in. OBDII cares that it is plugged in AND flowing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4bidden &raquo;</TD></TR><TR><TD CLASS="quote">OBD1 only cares that it is plugged in. OBDII cares that it is plugged in AND flowing.</TD></TR></TABLE>

Does this also apply for people running chipped P28's on their H22's? I have heard that the P28 does not read for EGR at all, is there any truth in this?

I ask because my motor is still in the works and I haven't been able to crank the engine up yet. Seeing if I can just yank the EGR stuff completely if the P28 doesn't read EGR.

 

Why do you need an EGR block-off plate at all?
Why not simply disconnect the vacuum line if you're OBD1?

With the line disconnected the egr valve remains closed and there's no flow of exhaust gasses back into the combustion chamber.
I've disconnected the vacuum line and egr-plug on my car (OBD1 non USDM) and it's been running fine for thousands of kilometers, no CEL at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb_one &raquo;</TD></TR><TR><TD CLASS="quote">

Does this also apply for people running chipped P28's on their H22's? I have heard that the P28 does not read for EGR at all, is there any truth in this?

I ask because my motor is still in the works and I haven't been able to crank the engine up yet. Seeing if I can just yank the EGR stuff completely if the P28 doesn't read EGR.</TD></TR></TABLE>

I'm pretty sure (not posative) that the P28 doesn't look for a knock sensor...
and to the last post quote:

"Why do you need an EGR block-off plate at all?
Why not simply disconnect the vacuum line if you're OBD1?"

A DAMN good point, as long as there isn't a vaccumm leak/difference that messes with you idle, but then again it sounds like it is working just fine for you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattmw88 &raquo;</TD></TR><TR><TD CLASS="quote">

I'm pretty sure (not posative) that the P28 doesn't look for a knock sensor...
</TD></TR></TABLE>

Yea, The P28 doesn't read for the knock sensor for the IAB's either. What I was wondering is if it reads for the EGR stuff.

**EDIT** After much searching, I found out that the P28 indeed does not see EGR stuff.


Modified by bb_one at 1:55 AM 10/3/2006

 

I'm trying to learn (I'm in highschool, so bear with me)
now if the ecu doesn't see the egr, you could just disconnect the vacuum line (obd1 of course) and not have to worry about it, correct?

 

If you are OBD1, you can unplug the EGR vac line without problems or CEL. However you cannot unplug the harness.

I was trying to get rid of all the EGR sensors and solenoids by unplugging them all & removing them completely (clean up engine bay). If you unplugged the lift valve from the electrical harness it WILL throw a CEL if you are on the P13 ecu or an ECU that reads for EGR.

 

so if my car is obd 1 (92' si) I still need to have the actualy egr valve still in my car to avoid throwing a cel?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92blkJDMh22 &raquo;</TD></TR><TR><TD CLASS="quote">so while fixing my EGR valve, i read the honda service manual and the hemls and read up on al things EGR related.........

those EGR Blockoff plates claim to be a cheap way to free up a few more hp..... but i submitt they are worthless and here is why.

they way the egr works is that when you are at cruzing or low speeds, the EGR conrtrol soleniod will apply vaccume to the EGR valve which will lift the pin inside the vavle allowing exhause gasses back into the block lowering the engine temp and reducing emissions........

well, it is only open at a constant or low rpm... durring accel or high rpms it is closed and no gasses get reused....... so how would blocking off the EGR vavle help? if you are trying to gun it at 2000-2500 rpm, i think you need to learn how to drive...... (excluding certain launch situation, you may be in that rpm range for a 1/8 of a second in first gear)

so, i guessi would say invest your $40 in something that will actually be noticed..... maybe a better air filter or something...... i dont see how the EGR blockoff plate will help you ever.....


Modified by 92blkJDMh22 at 2:46 PM 10/2/2006</TD></TR></TABLE>

You could invest that $40 in a Tornado intake swirler. That helps, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by godslayer &raquo;</TD></TR><TR><TD CLASS="quote">

You could invest that $40 in a Tornado intake swirler. That helps, right? </TD></TR></TABLE>

OF COURSE!