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Bye Bye EGR.......

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#82 ·
Paul, how are you not seeing "EGR insufficient flow" codes with this plate in place?

99VTECCoupe said:
There's no EGT sensor on these cars? I didn't know that.
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Who uses EGT from the factory? :confused:

99VTECCoupe said:
EGR lowers the combustion temperature. I believe this is because the exhaust gas can absorb greater specific heat. EGR also tends to make the engine more efficient because it allows advanced timing (lower temp = less preignition tendency) and less throttle loss (less power available at part throttle = higher throttle angle).
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EGR reduces combustion chamber temperatures because the gas is inert. it's already spent so it adds nothing to the combustion process. It displaces oxygen that would have been brought into the cylinder which allows you to run a leaner mixture at cruise.

99VTECCoupe said:
Isn't the EGR turned off at full engine load anyway? I've never done anything with a Honda engine at work, but all the GM/Chrysler/Ford engines have zero EGR flow at anything above like 90% throttle.
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Precisely. It's only used under cruise/partial throttle.
99VTECCoupe said:
edit - I understand what you're trying to do, but it doesnt really work on modern cars with modern electronics and variable EGR. The EGR is off at full throttle so it only 'robs' power at part throttle, which in turn actually (and counterintuitively) makes the engine more efficient (better gas mileage). So unless you're a part throttle racer unconcerned with fuel economy, EGR is one of those things that does very little harm aside from a little more carbon deposits upstream of the cylinders. EGR does take a lot of power out of diesels and older gasoline engines, but in the modern ones it really makes no difference. I appreciate you trying to do new stuff and you've done a lot of bad ass things on the J series, but IMO this does more harm than good. However, if Honda uses the EGR at full throttle (unlike every other gasoline engine I've ever tested/instrumented), this is all wrong.
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correct. I've never understood why anyone wants to remove/block off EGR on a street car.
 
#85 ·
How much, and how do i get one.
 
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#90 ·
Hey Paul, this is Robert...the guy your about to build the nitrous J32 for. I just finished reading this entire thread about your EGR block off adaptor. Firstly, the only thing that I could think of this actually affecting negatively would be the increased nox eventually setting a MIL after a few drive cycles. Unless I just overlooked it, I never seen an update/review on what became after installing the adaptor.

Anything bad? Anything good?

I'm quite certain that it virtually eliminated all carbon buildup on the intakes EGR passages but what about any other areas where carbon accumulation normally occurs...any significant difference? How about increased fuel economy?

Another thing, I seriously think the added combustion chamber cooling effects brought about by going down to PT after a WOT run with nitrous could benefit the engine more and help remove the heat that was added during WOT.

My point here is if there are added advantages here by running this simple block off, you think we should add during the build?
 
Discussion starter · #91 ·
The cars emission system does not look for nox and therefore is a non issue. Engines I have seen running this for 50K+ miles had no carbon in the intake. The EGR sytem shuts down at WOT per the tune of the car from the factory. The only two real advantage is to not have the exhaust carbon sucked back into the engine and for those running pre-cats not sucking the ceramic catylist back in if the front precat fails, which happens quite often.
 
#94 ·
rollym52 said:
i just have mine disconnected with my check engine light on lol
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That's not ideal because the ECM will go actually readjust on certain emissions codes to prevent and further damage and issues on the same as well as any other systems. This could be hindering both performance and gas mileage. For instance, I've seen EVAP system leak codes cause the ECM not trigger any lean codes due to the possibility of the EVAP leak causing that same issue therefore if there actually is an excessively lean condition, the ECM will not adjust and as mentioned, affect both performance and fuel mileage. The ECM does this to prevent any codes from stacking up on one another just from one problem because it's very easy for an EVAP malfunction to trigger all sorts of codes if this wasn't done.

DO THE BLOCK OFF AND KEEP THINGS RUNNING NORMALLY :)

NVA-AV6 said:
The cars emission system does not look for nox and therefore is a non issue. Engines I have seen running this for 50K+ miles had no carbon in the intake. The EGR sytem shuts down at WOT per the tune of the car from the factory. The only two real advantage is to not have the exhaust carbon sucked back into the engine and for those running pre-cats not sucking the ceramic catylist back in if the front precat fails, which happens quite often.
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I'm aware that excess nox wouldn't be detected but I was afraid of the possibility that excessive emissions causing premature catalytic converter failure. Especially since most of the nox produced by the engine is carbon. Thought?

Also, the motor show up yet?
 
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