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3800 sc removing egr or keeping it ??? by fierogtx
Started on: 02-19-2014 10:53 AM
Replies: 8 (967 views)
Last post by: Darth Fiero on 02-20-2014 03:03 AM
fierogtx
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Report this Post02-19-2014 10:53 AM Click Here to See the Profile for fierogtxClick Here to Email fierogtxSend a Private Message to fierogtxEdit/Delete MessageReply w/QuoteDirect Link to This Post
hi i dont know if it is better to remove or keep the egr on the 3800 im not looking for answer like i did it because everyone did it . im looking for a good theory why keep it or why not . in my mind the function of egr is to cool the combustion chamber to lower the nox but does it can help for the kr ( im putting some performance parts like s1x cam ported heads pulley intercooler headers .....)??????? many thanks for your help
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FIEROFLYER
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Report this Post02-19-2014 11:13 AM Click Here to See the Profile for FIEROFLYERSend a Private Message to FIEROFLYEREdit/Delete MessageReply w/QuoteDirect Link to This Post
Removing the EGR will make things cleaner on the inside of the super charger and throttle body and some like the look of it missing on the out side which i can see. removing it means the PCM needs to be programmed to match so no engine codes from it and will cost you a little on the fuel mileage.
Keeping it will dirty up the inside and may not look the best sitting there but will save you some fuel and will keep the emissions guys off you back side which from what I have been told Quebec is bad for enough already.
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fierogtx
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Report this Post02-19-2014 11:15 AM Click Here to See the Profile for fierogtxClick Here to Email fierogtxSend a Private Message to fierogtxEdit/Delete MessageReply w/QuoteDirect Link to This Post
does it have effect on kr ??????
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TbirdMarc
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Report this Post02-19-2014 12:50 PM Click Here to See the Profile for TbirdMarcClick Here to visit TbirdMarc's HomePageClick Here to Email TbirdMarcSend a Private Message to TbirdMarcEdit/Delete MessageReply w/QuoteDirect Link to This Post
yes, running egr makes engine run slightly cooler (who would of thought) thus reducing KR. I'm also in the midst of a 3800 series 2 sc swap and I'm keeping egr from all I have read.

[This message has been edited by TbirdMarc (edited 02-19-2014).]

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Lou6t4gto
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Report this Post02-19-2014 01:18 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
I Also Kept it. :-)
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fierogtx
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Report this Post02-19-2014 02:50 PM Click Here to See the Profile for fierogtxClick Here to Email fierogtxSend a Private Message to fierogtxEdit/Delete MessageReply w/QuoteDirect Link to This Post
the engine look better without it but it is about the kr that im not sure if it will have effect on kr
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FIEROFLYER
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Report this Post02-19-2014 06:47 PM Click Here to See the Profile for FIEROFLYERSend a Private Message to FIEROFLYEREdit/Delete MessageReply w/QuoteDirect Link to This Post
A properly programmed PCM along with mods to match what ever sized SC pulley you use is the best way of eliminating KR.
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fierogtx
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Report this Post02-19-2014 07:23 PM Click Here to See the Profile for fierogtxClick Here to Email fierogtxSend a Private Message to fierogtxEdit/Delete MessageReply w/QuoteDirect Link to This Post
thans fieroflyer your help is very appreciated
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Darth Fiero
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Report this Post02-20-2014 03:03 AM Click Here to See the Profile for Darth FieroClick Here to visit Darth Fiero's HomePageClick Here to Email Darth FieroSend a Private Message to Darth FieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
The EGR valve only works at part throttle on any engine, so any affect it would have on KR would only be during part throttle operation and it would have no impact on full throttle performance (or KR at WOT) at all.

That having been said, 3800 SC engines only have an 8.5:1 compression ratio and you should be running premium unleaded fuel at all times in one of these engines anyway (so you don't hurt it when giving it boost) - therefore there is virtually no risk of any KR or a hot running engine due to the EGR being eliminated - if you so choose to delete it from your 3800 SC engine.

Since it doesn't hurt performance, there's really no reason to remove it from your 3800 SC engine if it is already on there and in working condition. I've seen more guys introduce problems by deleing the EGR because of the leaks they create by not properly sealing the EGR system holes in the intake and exhaust. I've heard guys claim that having a working EGR valve coats everything in the intake (including the supercharger roots) with a black carbon residue after long-term use, but I've never seen any evidence to suggest this small amount of carbon buildup hurts performance one but. It is more of a cosmetic concern I believe. The truth of the matter is you will still get a carbon buildup inside the intake of any engine even if it has no EGR and no PCV system due to the fuel vapors condensing on the intake walls after you shut the engine off.

So my advice for anyone is if you already have a working EGR system on any engine you are using, there are going to be virtually no benefits to deleting it other than cleaning up the appearance of the engine. If you are building a Turbo setup with a different intake that would require you to go thru some pains of getting the EGR system to work, then it probably won't be worth your efforts to install it (due to the low compression ratios turbo engines generally run and the less benefits of having a working EGR would bring to this configuration).

The job of the EGR is to introduce inert combustion gasses into the cylinder to help cool combustion (reducing NOx emissions) during normal part throttle operation. On some applications, having a working EGR valve may result in a miniscule increase in fuel economy. Engines with low compression ratios, and even high compression engines with big overlap camshafts, will have little benefit of having a working EGR valve installed since normal part throttle combustion pressures (and temps) will be relatively low anyway.

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[This message has been edited by Darth Fiero (edited 02-20-2014).]

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