I was wondering what kind of EGT temps I should be seeing with my Vortech setup. At idle, I am seing temps of almost 1400 deg. at WOT. I was told by the guy that did my SC install that I dont want to see temps over 1300 deg at any point and this is very dangerous. Any comments/thoughts?

Also, what does it mean if the temps are too high? And, could this have an adverse efect on boost?

 

I think that's too high, I have a tt set up and get about 6000 at idle and about 9000-10000 at WOT.

But I have ceramic coated most of the hot spots like the manifolds, turbo housing, test pipes...

Hope this helps,

Tasso-

 

How much did it cost you to ceramic coat all your parts?

 

about 200-300$ CAN currency.

 

If the EGT is too high it could indicate that you are too lean. What are your AF ratios like? I don't recall ever seeing my temps above 1200° F.

 

9,000 - 10,000° F ????

 

That's after I have been kicking the car for most of the day.
I've never seen above 10,000 even on the hottest day !

 

do you wear a fireretardant suit when you drive, 10000 is solar heat man. imi surprised your car doesnt spontaneously combust.

 

Steel melts at just under 3000° F ...

 

Ooops !

I put one too many zero's

I ment 900-1000.

Sorry,

 

First off.....Im new to this ....But , to get a good reading that will do any good . The probe needs to be as close as possible to the exhaust port . Mine is one inch from the exhaust . Im getting temps of 1450 F at 12.8 psi and 6,500rpm . Hoping to get it down some today when we tune on the dyno . From what Ive read and heard . A/F ....and timing can effect EGT temps . To much timing...temps go up . To little.... temps go up and you go BOOM .

 

My numbers are probably a bit skewed here as my EGT probe is on the merge pipe of my two header feeds (Turbonetics kit). Cruising around off boost I get 600-800 degrees. Full boost in 3-5 highest I've seen is 1150 lowest is 950 while on boost (not full boost though)

 

EGT readings are like dyno numbers.. every car is different.. where you put the probe will make a big difference in readings. Like for instance, place it just a little close to the CAT and you will get higher readings... If you are sure everything is tuned ok just make sure your reading don't go up when ever you add a mod..

1300F-1400F is certainly still a reasonable number

I'm supercharged as well and my EGT seems to hover around 1200F with my latest tune and mods.. but with previous tune and mods, I have seen it hit 1400F ..

--mike

 

Booger is right, the temps will vary based on location. Booger and I compared our readings from manifold measurement, to downpipe, and with case manifolds, the temp drop was minimal. If your probe is on the test pipe, the readings will be much lower.

For comparison, I usually see about 1250 at WOT, and a slightly increase towards redline...never more than 1350. I think 1400-1450 is the safe limit. Some shops may go as high as 1600...so it really depends on your tuner. I wish there was a clear-cut answer for this, but there really isnt.

Timing, as booger mentioned, as a HUGE impact on EGT's. Very small changes in timing will dramatically change your EGT's...even though A/F ratios may or may not change dramatically.

Remember that although the exhuast gases can reach 1500 degrees, this doesnt mean the piston is getting that hot. The beauty of AL is its high specific heat, which means it takes a lot of energy to increase the temp of AL 1 degree. The melting point of pure AL is only 1220F. But becuase of the thermal properties of AL, the tops never get close to reaching this point, even with 1500 degree EGT's. The heat is quickly drawn to the bottom and skirts of the piston.

 

My AF ratios are from 11.5-12.0 from about 3300 to 6200 RPMs. They NEVER actually hit 12.0.

 

I believe my installer said that the probe is close to the collector(?). I assume it is ideal to be as close to the head as possible?

 

That is where mine is on the passengers side. It is just behind the header flange..

 

I paid $225, taxes in (Ottawa, Ontario). That's about 160usd. Some pics here: http://www.science.uottawa.ca/~paul/...rbo/index.html

 

I have seen extremely high EGT's, and perfect A/F ratios (too little timing). You really need to mate it A/F with EGT's to get a good picture of what's happening with the motor, IMHO.

 

We just got done tuning my car and EGT's never went above 1400 F this time . I reduced the timing and it didnt change the EGT's and made no diff in the power . I put the retard timing back in