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-   -   Intake Air Temp rise during a pass (https://www.yellowbullet.com/forum/showthread.php?t=2585845)

Greg O 07-11-2019 08:23 PM

Intake Air Temp rise during a pass
 
What are you guys seeing on an 1/8th mile pass? I ask because I installed a Holley Sniper EFI system this winter so for the first time ever I have a reading of Manifold Air Temp. Problem is I am not sure how well that sensor works.

I run about 10 PSI and use water/meth injection. My data logs show a 5 degree or less change in MAT for the run. I'd sure be happy if that were accurate but I can't believe my IAT does not increase more than that.

Honk if parts fall off shared a log with me and his was similar. Very little change so I suspect the Sniper MAT is just very slow to respond?

Screwblower 07-23-2019 02:34 PM

Re: Intake Air Temp rise during a pass
 
Change the sensor if you canít trust it.
The tune and motor survived, so all is good.
Read the spark plug for specific tune advice.

Ron Clevenger 07-24-2019 03:54 PM

Re: Intake Air Temp rise during a pass
 
If your running a AIS meth injection system , that's exactly what It's suppose to do.

boostedbowtie 07-24-2019 04:56 PM

Re: Intake Air Temp rise during a pass
 
And 10 psi for 5 secs isnt going to make much heat .

allend43 07-25-2019 10:38 PM

Re: Intake Air Temp rise during a pass
 
My experience with the GM type AIT sensors was that they were just too dang slow. Temps would read maybe 75 degrees hotter, but the pistons were destroyed. 25lb's boost with E-85 and water meth, 400 sbc. When I added the air/water intercooler, my tune was the same, but the pistons/heads now survive. So much for E85 not needing an intercooler! I'm reluctant to trust AIT sensors.

Greg O 07-27-2019 03:25 PM

Re: Intake Air Temp rise during a pass
 
I guess I just thought it would move more than it does. For example, on a pass last night the air temp was mid 80's. engine temp about 170*. I data logged 90 seconds which is from the time I cranked it in the staging lanes, did a burnout, made a pass then turned off on the return road. For the entire 90 seconds the MAT only varied from 116 to 128*. During the run itself it went from 121 to 127. You can't even see/tell where the water/meth comes on.

I just see guys talking about high 100s to low 200s intake air temps but I guess it is due to them running a lot more boost?

I am running a Holley Super Sniper and the MAT is built into the throttle body somewhere so not sure where it is picking up the temp.

boostedbowtie 07-28-2019 04:39 PM

Re: Intake Air Temp rise during a pass
 
Heres a log from a 34psi pass with the Holley MAT sensor .

Its right around 70 when it leaves and 120 at the stripe . So 50 degree temp rise in apox 8.7 secs

This is with ice , turning the pump on after the burnout .

I didnt think it was that slow to respond , slow but not THAT slow. I mean you can see the temps start to go down right after I lift .

Sensor is in the hat above an Accufab 4150 TB

[IMG]https://live.staticflickr.com/65535/...f923115c_b.jpgboostmap by David Cedoz, on Flickr[/IMG]

Mike Beck 07-28-2019 06:01 PM

Re: Intake Air Temp rise during a pass
 
Which MAT sensor are you using? GM has two types (that I have used). One is a sealed unit which is also used for water temp. The other is an open-end, you can see the thermistor hanging there in the breeze. I doubt that one would be good for boost though, besides, the body of it is designed to push into a rubber grommet, it does not thread in.

The open-ended one is FAST! I use them on my NA cars, drop at least 22* on a pass (1/4 mile).

The closed-ended one is SLOW! I forget how slow, but it was kinda useless, that is why I am using the other one.

I honestly do not know of any thermistors that can be put in a pressurized tract and stay-put. There could be some out there, since I never needed one I have not looked.

boostedbowtie 07-28-2019 06:10 PM

Re: Intake Air Temp rise during a pass
 
This is the Holley one I have


https://static.summitracing.com/glob....jpg?rep=False

Mike Beck 07-29-2019 09:41 AM

Re: Intake Air Temp rise during a pass
 
Quote:

Originally Posted by boostedbowtie (Post 71200369)

That is the open-ended type, far faster response time than the closed-ended style that can be immersed in the cooling system.

AlexLTDLX 07-29-2019 12:41 PM

Re: Intake Air Temp rise during a pass
 
My IAT sensor is in my lower intake (think fox body mustang); so my numbers will be a little higher than if it was in the discharge tube. This is a 1/4 mile pass (9.88 @ 140) running on Q16. I'll try to post an image, but you might have to click on the link to see it:

http://www.pikasfilm.com/copleymovie.../Run2_9880.jpg

http://www.pikasfilm.com/copleymovie.../Run2_9880.jpg

I have an A/W IC and run ice in it. This is at 14 psi boost.

The green line on the bottom graph is IAT.

The dolts now running YB are blocking private servers for pics. And so, we all lose...

Greg O 07-29-2019 01:17 PM

Re: Intake Air Temp rise during a pass
 
I definitely don't have that sensor. The Sniper has everything self contained in the throttle body. I actually have no idea how they pack the ECU, 8 fuel injectors, MAP and MAT sensors in there. You really can't see any of them.

boostedbowtie 07-29-2019 03:58 PM

Re: Intake Air Temp rise during a pass
 
Quote:

Originally Posted by Greg O (Post 71204255)
I definitely don't have that sensor. The Sniper has everything self contained in the throttle body. I actually have no idea how they pack the ECU, 8 fuel injectors, MAP and MAT sensors in there. You really can't see any of them.

Doesnt the sniper use the HP ECU ?

boostedbowtie 07-29-2019 07:06 PM

Re: Intake Air Temp rise during a pass
 
Sorry I was thinking Terminator EFI

Greg O 07-29-2019 09:31 PM

Re: Intake Air Temp rise during a pass
 
Quote:

Originally Posted by boostedbowtie (Post 71206143)
Sorry I was thinking Terminator EFI

Correct. The Sniper is the throttle body injection with everything self contained.


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