i did a search and didn't come up with much, so i was wondring if my gas mileage would be affected by disabling my egr valve? I'm thinking it probably won't since it's for emmissions control, but i would like more opinions(or facts). I'm not expecting any performance increase by doing this, it's just that there are no emmisions tests where i live and i want to get rid of extra crap.
Originally posted by minute rice sentra cool, i didn't think anyone was gonna answer. Thanx
***** Ditto, it won't hurt your mileage. But it probably will make it ping some going up hills. Listen for it. In any case, there is no gain in power by disabling the egr. I'd leave it alone if it worked.
That's wrong, it will not cause a ping. While the EGR does reduce combustion temperature, it is only active under light engine load, so when you really get on the gas (or going up a hill) combustion temperatures will be higher, and this is completely normal. Thus the engine has to be designed to operate without an EGR. Also, JDM engines don't have EGR and they don't ping going up hills.
Originally posted by jbloggs_c That's wrong, it will not cause a ping. While the EGR does reduce combustion temperature, it is only active under light engine load, so when you really get on the gas (or going up a hill) combustion temperatures will be higher, and this is completely normal. Thus the engine has to be designed to operate without an EGR. Also, JDM engines don't have EGR and they don't ping going up hills.
***** I disagree. Let me clarify my earlier statement. When I said going up a hill, I was referring to part throttle under load. That's when you'll get the pinging on an E-series powered car. Unlike other Nissan engines, including your SR20DE, the E-series engines are extremely sensitive to pinging. You can't do the usual bump of 5 deg. of timing and not have them ping [on the regular gas that they were designed for]. Further, unlike a JDM engine's ECU, a US spec engine's fuel curve is designed to operate with EGR. Minute Rice's car is a US spec car. Yes, I understand that EGR does not work at full throttle. That is why I said that disabling it does not add any performance.
Originally posted by blownb310 *****You can't do the usual bump of 5 deg. of timing and not have them ping [on the regular gas that they were designed for]. Further, unlike a JDM engine's ECU, a US spec engine's fuel curve is designed to operate with EGR. Minute Rice's car is a US spec car. Yes, I understand that EGR does not work at full throttle. That is why I said that disabling it does not add any performance.
so you're saying that it will ping occationally no matter what the timing is set at or just if it's advanced several degrees?
Originally posted by minute rice sentra so you're saying that it will ping occationally no matter what the timing is set at or just if it's advanced several degrees?
***** There are many variables. All I'm saying is that all of the E16's I've ever owned [have to be a dozen or so] pinged if advanced more than spec. Just use your ears, you'll know if you got carried away.
If you get pinging at 5 degrees of advance then either run 94 octane or go with 2 or 3 degrees of advance. I don't see what the timing has to do with the EGR. With the EGR system working the engine runs cooler under part throttle and normally under heavy load and idle. It handles both scenarios just fine. If you disable the EGR, the engine runs at its normal temp all the time. It is designed to run at this temperature. The only purpose of the EGR is to reduce NOx emissions, not to prevent preignition. Also, regardless of what the fuel curve says, fuel injection is monitored by the O2 sensor(s) and the ecu adjusts it accordingly.
I guess what I'm trying to say is too much advanced timing will cause pinging, which is true for any car. Disabling the EGR, on the other hand, will not.
Last edited by jbloggs_c : Jul 30th, 2003 at 09:40 AM.
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