EGTs

itb gt · 08-09-2007

Help,need to go faster!Does anyone have any idea of the best EGTS .One of the opels has a gauge but we little information.One car ,the manta hasnt had problems with heat but the G.T. is always running hot,so Im looking at the fuel system the week. Jim

RallyBob · 08-09-2007

Jim, I always had good luck making power with 1350-1450 degrees F. Opels do run hot, they tend to run over 1600 degrees if everything is not 'just right'.

wrench459 · 08-09-2007

exhaust gas temps are a great tuning tool
In my perfect world 4 sensors mounted an inch from the head ports
and 2 more downstream and..

itb gt · 08-09-2007

OK,if Im going to set this thing up on the GT which pipe on the header do I pick?Next race may be a throw away as I have to try out the new tires(lastyears 06s,Ive been running the old 05s) so this may be the best time.

spdkilz02 · 08-09-2007

#2 & #3 are the hottest of the cylinders.

wrench459 · 08-09-2007

All four for the baseline
and then it gets fun
#3 is the problem child for sure
lean you can see temps of over 2000,3000 or even more
rich 1200
so find the sweet spot for your combo

wrench459 · 08-09-2007

If you put a A/F ratio sensor after the head pipe.
Now that would be interesting info!

jeff denton · 08-10-2007

I use a truck-style pyrometer on my car, it's probe goes into the exhaust pipe about a foot aft of the collector. I've seen it go to just a tad beyond 1200. I don't really know what that means, or how to affect it or why. It was just kind of donated by a truck shop to play with. Just for fun, ya know...

RallyBob · 08-10-2007

Jim, when we used a pyrometer on the engine dyno, we fitted the probes about 1"-1.5" from the head. #2 consistently ran the hottest on every 1.9-headed Opel I dynoed. #3 was close behind, about 25-50 degrees cooler. Then #4, usually, at about 100-125 degrees cooler, and finally #1, which on some engines was as much as 200 degrees cooler than #2.

I was able to correct this for the most part with a split profile camshaft and by balancing the exhaust port flows with extra porting work....but for your type of racing this is not legal to do. All you can do is tune for the hottest cylinder.

Bob

wrench459 · 08-10-2007

Can we cut to the chase and talk about combustion camber temps.
instead of exhaust ports temps?

08-09-2007	#1 (permalink)
itb gt Opeler Join Date: Jun 2006 Location: N.H Posts: 12	Unanswered: EGTs Help,need to go faster!Does anyone have any idea of the best EGTS .One of the opels has a gauge but we little information.One car ,the manta hasnt had problems with heat but the G.T. is always running hot,so Im looking at the fuel system the week. Jim

08-09-2007	#4 (permalink)
itb gt Opeler Join Date: Jun 2006 Location: N.H Posts: 12	Pick a pipe OK,if Im going to set this thing up on the GT which pipe on the header do I pick?Next race may be a throw away as I have to try out the new tires(lastyears 06s,Ive been running the old 05s) so this may be the best time.

08-09-2007	#5 (permalink)
spdkilz02 1000 Post Club Join Date: Dec 2002 Location: Akron, OH Posts: 1,734	#2 & #3 are the hottest of the cylinders. __________________ Adam

08-10-2007	#8 (permalink)
jeff denton former opel racer Join Date: Nov 2002 Location: near some glaciers Posts: 2,863 Real Name: Jeff "Oh-Oh" Denton Provided Answers: 4	I use a truck-style pyrometer on my car, it's probe goes into the exhaust pipe about a foot aft of the collector. I've seen it go to just a tad beyond 1200. I don't really know what that means, or how to affect it or why. It was just kind of donated by a truck shop to play with. Just for fun, ya know... __________________ No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning.

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