ScionDad

Well, I got the S-Pipe installed with the EGT probe right at the down pipe collector of all 4 cylinders. Before I started the turbo installation and cooler mod, I figured I'd drive the car around stock just to see what the reading were and give me an idea of stock normal verses emanage tune later with turbo.



Idle - 650 degree

Just crusin - 1000 to 1200 degree

WOT - 1400 to 1500 degrees

Nick06tC

its funny you posted this. I was actually wondering the same thing. I know things are hot, but wow that is more than I was expecting.

ScionDad

You and me both....esp since my Autometer Cobalt gauge only goes to 1600

Nick06tC

I am still in a huge debate on what gauges to get. I know everyone says go elextix gauges. But they are so darn expensive. So I am probably going to get autometer ultra lite or cobalt mechanical (boost, EGT, oil temp)

ScionDad

Well I have the Cobalt ones and they are great looking and self calibrating as well.

jct

WOW

Nick06tC

They are completely wrong for you. I highly reccomend you remove them and sell them to me cheap. I am doing this for your won good.

cdubber9

I just got the defi d-gauges (boost, egt, oil p), they were kinda expensive, but good quality and well worth it.

I'm not sure where to mount the egt sensor yet, does it have to be on the turbo manifold or would it be ok on the downpipe? The instructions say to tap an 1/8" hole into the exhaust manifold and thread the fitting in. Is it thick enough to tap or should I just have a bung welded on?

yamaha16bw

Yeah those temps are higher then I thought they would be. You say your gauge only goes to 1600 well do you think with the turbo it might hotter then that? The gauge would be kinda pointless then unless someone makes one with a higher temp reading.

cdubber9

defi-gauges go up to 2000

ScionDad

Well, in reality it should run the same temp with or without turbo, it's all in the tune is what I was taught years ago. Too hot is too hot as they say. There should be a max temp then fall off, with both rich and lean conditions. I was just kinda shocked at the high end wide open throttle temp from stock tune.

As for the location of the probe, if you can tap on the hottest cylinder, that is the best, hoever, not alot of people want to dig into their manifold. The next best place is the collector point of the down pipe. I did it on the S-Pipe, right past the connection to the down pipe. It's about 1.5 feet from the exhaust port, so it should be good enough reading.

TurboCustomz

In theory, 1600 degrees can melt pistons to cylinder walls. If its hitting 1500 past the manifold, its getting quite a bit hotter in the cylinder. I think its safe to say that detonation could be a concern with those cylinder temps. It only takes one tank of bad gas when you run close to the edge to grenade an engine.

MIAPLAYA

You should the same or similar EGTs when boosted depending on how much timing is run. If you retard the timing you should see a decrease in EGTs all things being the same.

seen4ever

i would have to agree, if its 1500 degrees past the manifold, who knows how hot it is at 1 inch off the runner on the manifold. very surprising a stock car would run that hot of temps. I'm interested to see what they do with turbo back on.

MIAPLAYA

Well unfortunately most cars these days run pretty advanced timing maps for emissions reductions. No doubt that is a contributing factor. The hotter the EGT is the faster the cat heats up and works..

ScionDad

Yeah, I'm very suprised at the temps. We do run 91 octane still and I still have the colder plugs in. But wow.

I asked around a little and was told the following for typical turbo -

1) Idle anything from 800F-to 1100F

2) Cruise around 1300F to 1600F

3) WOT I'd shoot for 1500F

MIAPLAYA

On my turbo Z and granted this reading is at the feed pipe for the turbo I run:
400-600 idle
800-1000 cruise
1000-1200 WOT
1150-1350 Road Race

ScionDad

Now THAT is more like I'm used to seeing.

MIAPLAYA

Unfortunately I don't have before numbers to compare against but keep in mind my car runs nowhere near as much timing as it did stock. I think stock max advance is in the 23-25 degrees range and now max advance is like 14-17 degrees.

TurboCustomz

Scion Dads car runs rotary EGT's

No seriously, I would have some concern if I ever saw 1500 degree's under load. Or anytime for that matter on a piston engine.