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Discussion Starter · #1 ·
been looking around (and searching) and returned a whopping.....nothing. <IMG NAME="icon" SRC="http://www.vortexmediagroup.com/images/banghead.gif" BORDER="0"> <p><br>do you guys have a concern with monitoring the EGTs? <br>i would assume with the obviously small IC (with the space i cant see how it could be large in any way shape or form) and (presumably - dont think i ever got a response to this in my other thread) small non VVT turbo that they would be of particular concern, yet i cant seem to find a single reference to it? <br>I have seen someone mention an 'aquamist system' or the like - which i can only assume to be a water/meth system. But since im still new...i dont know if its application on our cars is more on the side of power or cooling. I know a few people in the high performance diesel world(where i get most of my turbo knowledge - so it might not be applicable here) running a snow perf. water/meth with 100% meth who have windowed the block and others who use the same system at 90/10 for cooling.<p>thanks<br>-<br>CH <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0">
 

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No need to monitor EGTs on a stock car. <p>In fact monitoring A/F ratio is superior anyway.
 

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Discussion Starter · #3 ·
Re: (quick)

quick, thanks for the response:<p>but <B>IF</B> (hypothetically of course <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> ) i plan on doing 'a few' performance mods, will they come into play? I also wouldnt mind being able to see what they are before i shut down (if ive just come off a hard run, long drive at high speed, etc) as while i realize 'wet stacking' isnt really an issue in a gas engine, 'coking' the oil in the turbo certainly could be. <p>as far as A/F – a good idea. i can definitely see how that COULD be important, but as i was searching for info on EGTs, etc i came across a discussion about A/F which made me think it was a lot more trouble than its worth (apparently its not only pulsed, but several people were unsure if it was narrow or broad, and even where a good tap would be) on the s40s.<p>Either way – still not really sure where I would put any of them, just sort of thinking ahead. I don’t want to mess up the aesthetics of the interior (which I think gauges might) and have yet to see a good clean looking install. <p><br> <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/embeer.gif" BORDER="0">
 

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sure thing. <p>If you're going to do something to the car you should do it on an eddy-current dyno which will allow you to approximate hard street driving. You will want to do that with a wideband A/F meter as well. <p>Then you should not have to worry, in theory. <p>The EGT gauge is iffy... you need to know the right place to locate it, etc. In the downpipe will probably not provide you with a rapid-enough or accurate reading. <p>...and then you have to determine if you want to put it in a runner of the exhaust manifold. Then which runner. Etc. etc. <p>I'd go with the wideband, personally.... <p>check out <A HREF="http://www.sdsefi.com/techegt.htm" TARGET="_blank">http://www.sdsefi.com/techegt.htm</A>
 

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Discussion Starter · #5 ·
1800?! whoo.... i guess i have some learning to do about EGTs on gas engines, thanks for the link! Right now I run about [email protected] on the freeway in the truck (diesel). Heat soaking to ~1000 on a car I can see, but I would be seriously worried if I hit 1800 for more than a second or two on anything but a specifically race built engine! <p>I would never try to tune an engine to or around a certain EGT - seems a strange concept to me? In theory I can see how it would make it efficient, but it would be impossible to hold that EGT with anything but a dyno queen.<p>As for location, I couldnt agree more: if I end up doing it would definitely have to be pre turbo and as such, would be in the manifold. I dont about these engines, but on the ones im used to 'tuning' you can see a + 400-500 degree variation pre/post turbo. <p>Is there anything I DO need to worry about if I plan on trying for about 260-290 to the wheels? (since it was my other option when getting the car, and i have friends who have them.... ive gotta be able to take out G35s ya know <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> )<br>
 

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not sure -- talk to 'oldman' and do a little searching. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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It's been my experience that an EGT gauge can be a good 'early warning' indicator of problems and it's frequently easier to install than an A/F, especially if you need your own wideband sensor.<p>The EGT won't tell you what is wrong but it can tell you that SOMETHING is wrong as long as you have a good set of baseline data. A/F data is necessary for a custom tune but if you're only monitoring an off the shelf tune maybe you don't need it.<p>EGT depends on where the sensor is mounted, obviously. On my WRX it was on the cylinder the farthest down the fuel rail (theoretically the leanest) and plumbed into the manifold about 3" from the head. I saw about 1550 F maximum (it went to 1650 at one point with a wonky tune). EGT's in the downpipe will be far lower for example.<p>EDIT: You wont' have to worry about G35's as soon as you get a tune (Evolve, BSR, whatever).
 
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