ralphie14

Looking to compare EGT readings with a few others. My setup...

01' B18B with a t3/04 b. EGT tapped off the #3 runner about 2 inches from the head. at 60-65 mph it reads about 1000 F. What are some of you runing?


Second question is if anyone has a vague idea as to what a dangerous temp is on the B18B with boost. I know that every motor is a little diff. also the air fuel ratio will have an effect as well. Just looking for a ball park number is there is one to be had.

Boosted Chemist

iTrader: (1)

i dont believe there is a general number to shoot for, its a good gauge for highway pulls, ie 4th gear and your afrs are good, but the egt starts rising its time to left off

dustin

What RPM are you at when going 60-65mph?

1000F is 537C which seems low (but you're probably at low RPM)

Sustained 75mph (GSR around 3700rpm) I see about 750c which is ~1400F.

EGT is highest at 14.7:1 AFR, so your EGTs will go down if you accelerate.

grndcont

i cant remember exactly what mine are, but that sounds consitant with my temps. they seem high to me.

mike1114

iTrader: (1)

like he said, one motor will differ from another. Its good to get an average of what your motor normally is, then just keep an eye on it every now and then to see if you temps are still "normal"

for my boosted b18c I see normal stop and go driving (no boost) around 850F, in boost around 1100-1250F.

As a general rule of thumb, if your egts get into 1450F + range, get off the throttle till they come back down. You could be running too rich or lean somewhere.

ralphie14

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">What RPM are you at when going 60-65mph?

1000F is 537C which seems low (but you're probably at low RPM)

Sustained 75mph (GSR around 3700rpm) I see about 750c which is ~1400F.

EGT is highest at 14.7:1 AFR, so your EGTs will go down if you accelerate.</TD></TR></TABLE>

I have an LS but I have a GSR tranny so at 60-65 I usually run 3000-3500 I beleive. I have not taken it out of town on the interstate yet so 65 is the high sustained speed that I have hit.

fjt

On my motor at the dyno the EGT stayed right at 1000 F at WOT and redlining at 7000rpms...on 18 PSIs of boost..This was on 4th gear pulls
Mine is tapped 1 " from the turbo in the Downpipe so that is probably a 1200F

ginoboy1978

My car, highway driving @ 75mph, 3500rpms ~1400 degrees.

DAN

B16Civic93

i have a b16 with a type r tranny, and the egt tap is in the downpipe around an inch or two from the turbo. and on the highway at like 70ish its around 800-1000f. it gets to around 1200+sometimes when getting on it hard or beating on it alot. stock block by the way.


Are you guys stock block or built block?

will built motors hold a higher egt? if so about how much more?

dustin

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16Civic93 &raquo;</TD></TR><TR><TD CLASS="quote">i have a b16 with a type r tranny, and the egt tap is in the downpipe around an inch or two from the turbo. and on the highway at like 70ish its around 800-1000f. it gets to around 1200+sometimes when getting on it hard or beating on it alot. stock block by the way.


Are you guys stock block or built block?

will built motors hold a higher egt? if so about how much more?</TD></TR></TABLE>

EGT in the downpipe does you absolutely no good. turbo works off heat and pressure... need to measure EGT before it.

B16Civic93

why do you think it does no good after the turbo? it actually says on the instructions for installing it to do it after the turbo on the downpipe.

I can see that it might lower the temp reading a hundred degrees or so. but i bought the downpipe used and it already had the tap in it so i used that. so you wouldnt suggest using the reading after the turbo?

what difference does it make?

dustin

The reading after the turbo has little to do with how hot the exhaust gas was when leaving the head. I can't imagine what sort of instructions would tell you to put the probe after the turbo... that's just bad advice.

Best scenario is individual EGTs on each cylinder, 1-2" from the head. But since this isn't usually realistic, you want the EGT probe on cylinder #3's runner 1-2" from the head. #3 runs the hottest due to the firing order.

The other possibility (not as good) is if you have a 5bolt turbo, you can tap the downpipe flange and put the probe where the internal wastegate hole is. This is technically pre-turbo and you should see similar numbers, but it will be an average EGT of all 4 cylinders, rather than just #3.

RacerXI

My B16 turbo with the egt in manifold is 710C at 70-75mph on the highway.

wantboost

iTrader: (2)

ive found that with the autometer egt gauge.. the bulb that lights the gauge runs about 150-200 degrees... and that throws the readings off

dustin

Unless the bulb is touching the probe, it won't have any effect.

adseguy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote"> #3 runs the hottest due to the firing order.
</TD></TR></TABLE>

I know I'm being picky, but that's just me. I thought it was the hottest because it received the hottest coolant and it wasn't on the side like #4 is. Please correct me if I'm wrong.

and yes EGT's are not a good tool if used after about 1-2". You want to know combustion temperatures not how hot a gas is in a certain area of the exhaust. I was reading this article and to summarize it said basically that it really shouldn't be used as a tunning tool, but more to make sure that everything is in check kindof like a oil pressure gauge or something similar.

USDM 4G VTEC

http://autometer.com/download_instruction/551.pdf



and no #3 is not the hotttest due to the firing order
because #2 is also between firing order 1&3

it has to do more about our engine design and air flow going into the engine
with engine design i mean, it also has the least amount of coolant round it