Between 1300-1400*F during cruise and as high as 1500-1650*F at WOT.

 

sweet i thought my gauge was wrong or i was gunna blow up my car...a buddy said it was high...thanks jamie

 

All cars are different for cruising EGT's, these ranges are just the average that you'll see on an Evo 8 or 9. My Old Talon (turbo'd NT) would cruise at really low EGTs of 1100-1200*F.

 

Just wanted to chime in with my best mpg report.

38mpg

No BS here either and I'll tell you how I did it.

I drove country roads to the lake shore and back total of 168 miles, same stretch of road same everything other than time of day.

I filled the car up all the way before I left, wiggled the *** a bunch until is was full.

I stopped in at the same gas station and filled up the same way and could only put 4.4x gallons of gas in the car.

168/4.4 = 38 mpg and a couple tenths.

The trick was that I hypermiled the car... kinda sorta.


I would get up to my target speed of 65mph and bump the shifter into neutral and let the car idle along until about 55mph and then accelerate back up to 65mph. Yeah I know, I'm nuts but I was curious and felt like experimenting with hypermiling the EVO the same way that I would my electric car.

Needless to say you really can't drive like this in the real world but I could get away with it without ticking off the drivers behind me.

At first I tried to accelerate gently, keeping the vacuum high enough to keep the EGR valve functioning but after a while some cars started closing in from behind and I had to accelerate normally... about 5-7psi of boost was my acceleration target.

So I there I went down the road about 80 miles, had dinner and drove back to the gas station.

Try it yourself for 40 miles and see what you get for mpg.

 

hypermilling not be a jerk, straight pisses me off, you have no idea how many prius's blow stops signs in my neighborhood due in short to the jerkoff that came up with this technique, caused an accident by me recently, by the way if you advanced your ignition timing in cruise you wouldnt have to make boost to accelerate i find my car accelerating in 5th gear no less, at 8-10 psi of vacuum and about a 15.6 AFR, i think the EGR system is genious but i think ive personally proven to myself that it saves more gas in open loop. mind you all my testing is done with both around town and highway driving together, and i have also leaned out acceleration out of boost down low for around town driving with no adverse effects to egt or WOT pulls, i have not added timing down low for around town driving though...i may in the future im extremely happy with my gas savings


also...i was not taking a shot at you merely at hypermiling done by idiots...im sure you dont do that or if you do not in a suburban neighborhood with kids in it

 

Can you post your current timing map? Curious to see the numbers.

 

Not sure what your really after, but I have been averaging 20-21 city mpg with my mods listed below. If I drive it like I stole it? thats another story. You want to save gas? Use less pedal. haha.

 

Where's your sensor mounted? Mine is mounted in the O2 housing and I only see around 1300F @ WOT and 900F during cruise.

 

Thats too far away. The EGT sensor is generally supposed to be about 2" from the cylinder head in one of the exhaust manifold runners. I prefer to have it on the cylinder that gets fuel LAST via the flow direction of the fuel rail since that'd be the most likely cylinder to have a lean condition.

 

IIRC, cylinder 3 usually runs leaner than the rest. I would love to mount it on the exhaust manifold for more accurate readings but I dowan a broken sensor destroying an expensive turbo

 

mrfred ill see if i can get my timing map up here, i hav next to no time it seems lately i usually log on here while at work...and ecuflasher the reason that thats too far is that an EGT gauge is there to alert you to a potential problem, if its at the O2 housing its not only too far away to let you know of a problem but its being cooled off by the fan over to its side, giving yet another false reading, but its too far away that if there was a problem and you saw it and try to stop more the damage would hav already been done, ill take a turbo over a motor anyday

 

I'm up to 21 mpg. Still at 14.7 afr in closed-loop (I'll start running 15.3 next week). I think the extra 1 mpg is just from bumping the tire pressure up from 33f/30r to 36f/33r. I have made a few changes to the timing maps in the last few days. I've added more timing in selected spots and then had to remove a few degrees of timing in the 2500-3000 rpm / 70-80 load cells. I was getting very consistent knock of around 1-2 counts (but saw a 9 count in one log) when traversing these cells. Part of it was that I had modified the EGR advance map to toss in 1 degree of timing in these cells (versus 0 deg in the stock EGR advance map), and I think that is what was triggering the knock. I removed that 1 deg of advance, and I still pulled 1 deg out of the high oct ign map as well in that range. If there's no further knock, I'll try adding back the 1 deg in the ign map. My overall experience is that the EGR advance map can/should be left alone for the most part, but for the main timing map, there's no problem at all with adding 3 deg of timing in all of the cruise cells. I've got as much as 6 deg more timing in some cells. Here are my current timing maps:

Hi Oct Timing Map:


Hi Oct EGR Advance Map:

 

im using the open loop method, but my timing map has 38* in the 50 and 60 load cells around approximatly where yours is 36* and 34*, but im running less in the 0 and 10 load cells i think around 36*, and im still getting a no load rev knock, like if im sitting and i rev the engine hard i get 1 count consistently...havnt had a chance to log the load, i just noticed it quickly when i flashed it for the leaner idle, im finding my idle is fluctuating at random, its set to idle at 15.9 i usually see around 16.0-16.1 but randomly its been hitting 17.0, egts dont even move so i dont believe it to be dangerous if i tap the gas it goes back to normal...my delemma so far, like i said i have no dam time to get this straigtened out...i will attest to better fuel economy tho

 

My understanding is that leaner mixtures will burn even slower than at 14.7:1, so more timing is possible.

 

wow...thats good to know...i was going to start implimenting 40*+ of timing in the lower load lower rpm sections of cruise and see where the knock limit is...i have up until now been very conservative.