EGT #'s on throttle stop

sg5985 · 02-16-2021, 04:27 PM

Does anyone pay attention to EGT's on throttle stop? I'm wondering what kind of temps a person should see. Sunset 582 on gas with Stinnett 1050 carb

Tom Goldman · 02-16-2021, 06:34 PM

I use O2 's now ,used to have EGT'S . Besides my own data ,I see a lot of other racers data graphs. .... I can tell you most carbs will go very lean while on the stop .
the only carb I ever had that did not go lean was an APD Max Speed .
EGT's around 1275 and O2's around 12.5-13 to 1 are common ...

sg5985 · 02-16-2021, 06:50 PM

Thanks for the info. My numbers are so cold that I don't trust them; 650 -700 when I drop. Makes me wonder if I have a setting wrong in my racepak. I only run one egt so small sample size also.

sg5985 · 03-02-2021, 02:58 PM

Upon closer review of my data, my egt's are 650 at the hit, 750 coming off the stop, and 950 range at finish line. Sorry about that. I should know better than to rely on my memory

Tom Goldman · 03-02-2021, 11:58 PM

That's really cold , that's measuring right at the port ?
If that reading is accurate I'd think the car would almost look like it was rolling coal down the track.
I'd suspect a faulty EGT probe or wrong setup on the Racepak configuration .

sg5985 · 03-03-2021, 01:50 PM

Interesting. The probe is about 2" down the pipe on #5. I've heard that being too close to the head can create a false reading but more likely to be high than low.
The plugs look ok, the cruise is very flat at 4400 and the 60's are pretty consistent but the car is very difficult to dial in changing conditions and humidity seems to really affect this setup. I've gone 180mph in good air bracket racing but only 170-172 on the stop. Timing @ 34'. 1050 carb with 91 main jets.
Appreciate the feedback

sg5985 · 03-03-2021, 01:55 PM

Btw, while my handle is SG, this is data from my Worthy swingarm SC dragster

Tom Goldman · 03-05-2021, 12:14 AM

that kind of performance swing usually indicates a over rich tune up , plus a rich setup usually is very consistent on the cruise rpm.
Have you talked to Stinnett about it ?

sst5167 · 03-05-2021, 08:36 AM

I too, run a Stinnett carb on both my super gas and super comp car. What jets do you have in it?

sg5985 · 03-05-2021, 05:00 PM

I run primarily in 2000-4000 DA with 91 main jets

02-16-2021, 04:27 PM	#1
sg5985 Junior Member Join Date: Jan 2010 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	EGT #'s on throttle stop Does anyone pay attention to EGT's on throttle stop? I'm wondering what kind of temps a person should see. Sunset 582 on gas with Stinnett 1050 carb

02-16-2021, 06:34 PM	#2
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,435 Likes: 773 Liked 699 Times in 203 Posts	Re: EGT #'s on throttle stop I use O2 's now ,used to have EGT'S . Besides my own data ,I see a lot of other racers data graphs. .... I can tell you most carbs will go very lean while on the stop . the only carb I ever had that did not go lean was an APD Max Speed . EGT's around 1275 and O2's around 12.5-13 to 1 are common ... __________________ Tom Goldman 1500 SG , 1506 STK Last edited by Tom Goldman; 03-02-2021 at 11:59 PM.

02-16-2021, 06:50 PM	#3
sg5985 Junior Member Join Date: Jan 2010 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	Re: EGT #'s on throttle stop Thanks for the info. My numbers are so cold that I don't trust them; 650 -700 when I drop. Makes me wonder if I have a setting wrong in my racepak. I only run one egt so small sample size also.

03-02-2021, 02:58 PM	#4
sg5985 Junior Member Join Date: Jan 2010 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	Re: EGT #'s on throttle stop Upon closer review of my data, my egt's are 650 at the hit, 750 coming off the stop, and 950 range at finish line. Sorry about that. I should know better than to rely on my memory

03-03-2021, 01:50 PM	#6
sg5985 Junior Member Join Date: Jan 2010 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	Re: EGT #'s on throttle stop Interesting. The probe is about 2" down the pipe on #5. I've heard that being too close to the head can create a false reading but more likely to be high than low. The plugs look ok, the cruise is very flat at 4400 and the 60's are pretty consistent but the car is very difficult to dial in changing conditions and humidity seems to really affect this setup. I've gone 180mph in good air bracket racing but only 170-172 on the stop. Timing @ 34'. 1050 carb with 91 main jets. Appreciate the feedback

03-02-2021, 11:58 PM	#5
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,435 Likes: 773 Liked 699 Times in 203 Posts	Re: EGT #'s on throttle stop That's really cold , that's measuring right at the port ? If that reading is accurate I'd think the car would almost look like it was rolling coal down the track. I'd suspect a faulty EGT probe or wrong setup on the Racepak configuration . __________________ Tom Goldman 1500 SG , 1506 STK

03-03-2021, 01:55 PM	#7
sg5985 Junior Member Join Date: Jan 2010 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	Re: EGT #'s on throttle stop Btw, while my handle is SG, this is data from my Worthy swingarm SC dragster

03-05-2021, 12:14 AM	#8
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,435 Likes: 773 Liked 699 Times in 203 Posts	Re: EGT #'s on throttle stop that kind of performance swing usually indicates a over rich tune up , plus a rich setup usually is very consistent on the cruise rpm. Have you talked to Stinnett about it ? __________________ Tom Goldman 1500 SG , 1506 STK

03-05-2021, 08:36 AM	#9
sst5167 Junior Member Join Date: Dec 2009 Posts: 52 Likes: 17 Liked 17 Times in 9 Posts	Re: EGT #'s on throttle stop I too, run a Stinnett carb on both my super gas and super comp car. What jets do you have in it?

03-05-2021, 05:00 PM	#10
sg5985 Junior Member Join Date: Jan 2010 Posts: 16 Likes: 0 Liked 0 Times in 0 Posts	Re: EGT #'s on throttle stop I run primarily in 2000-4000 DA with 91 main jets

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