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Old 05-15-2007, 08:07 PM   #1
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Default Intake location and its affect on AIT

Interesting observation from today.

With the intake U tube and the airfilter in the standard greddy position, today and yesterday, I was seeing intake temps of 140 deg f at hot idle. With the airfilter 4" forward of the turbo, sticking straight forward (like olderguy's but without the afm) intake temps were 110 deg f at hot idle.
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Old 05-15-2007, 08:17 PM   #2
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wow...but how do you run that without the intake flapper thing? haha
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Old 05-15-2007, 08:18 PM   #3
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uhm, the big red avatar doesn't give it away? :gay:
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Old 05-15-2007, 09:24 PM   #4
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MS PNP for the win.... throw away your AFM's ladies and gentlemen
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Old 05-15-2007, 09:54 PM   #5
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i'm curious how this translates to intake temps under boost, many people will argue air filter locations are meaningless since the air still has to travel through the intercooler. I'm wondering if the 30 degree delta will still exist under boost
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Old 05-15-2007, 09:57 PM   #6
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temp sensor is on the throttle side, probing air that's already through the cooler
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Old 05-15-2007, 10:05 PM   #7
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90° to behind headlight w/ NACA duct; heat sheild blocking the turbo = slightly higher than ambient idle & cruise
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Old 05-15-2007, 10:11 PM   #8
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Quote:
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uhm, the big red avatar doesn't give it away? :gay:

good point...i just figured you were advertising it to jump on the bandwaggon:gay: ...just kidding. okay you got me there
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Old 05-15-2007, 11:32 PM   #9
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Quote:
Originally Posted by Ben View Post
temp sensor is on the throttle side, probing air that's already through the cooler
i realize the iat sensor is right before the throttle body but i'm questioning if that 30 degree difference in temp exists when compressor outlet temps start to get high
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Old 05-16-2007, 11:34 PM   #10
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Ok, here are some datalog captures. The first is with the greddy air intake position:
MAP 136 kpa
Mani Temp 122F
CLT 211F
AFR 10:1

The second is with the airfilter straight off the turbo, pointing towards the front of the car
MAP 160 kpa
Mani Temp 108F
CLT 207
AFR 12.7:1

So, with the intake towards the front, this shows more boost, with a leaner mix, at lower temps.
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Old 05-17-2007, 12:32 AM   #11
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Ben ,could translate what "kpa" and "clt" means for the un-iniated? Thanks.
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Old 05-17-2007, 01:40 AM   #12
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kpa kilopascals
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Old 05-17-2007, 01:58 AM   #13
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anything over ~100 kpa means under boost. 7kpa=1psi
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Old 05-17-2007, 03:06 AM   #14
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I took some datalogs (20 minutes worth) after getting my car on the road today with no hood installed and intake placed just behind the headlight. I have a gt2554, 16x10x2" intercooler, megasquirt, 150kpa (about 8psi). According to Megatune and a GM AIT tapped into the manifold, my highest temperatures were 114 and lowest 94. What was even more surpisising was that the highest temps were at idle/cruise, and the lowest were under boost.
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Old 05-17-2007, 04:22 AM   #15
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Quote:
Originally Posted by akaryrye View Post
What was even more surpisising was that the highest temps were at idle/cruise, and the lowest were under boost.
That'll be because at idle you're not really using the intercooler at idle as there's no nice cooling air rushing through it at speed

I know there will be a difference in normal running putting the air filter out of the way of the turbo heat, but it does make less difference than you'd think. Idle is really the only place you'd notice it at all as you start to get heat soak through the filter and the intercooler is only running on the air the cooling fans are drawing through.
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Old 05-17-2007, 09:39 AM   #16
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Ben, remove your turn signal lens and perform the same log.
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Old 05-17-2007, 09:54 AM   #17
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Quote:
Originally Posted by Exhondaman View Post
Ben ,could translate what "kpa" and "clt" means for the un-iniated? Thanks.
kpa = pressure, in this case absolute pressure so you have to subtract atmo to see boost
CLT = coolant temp, ie engine temp

Brainy
I can later, but it's not going to be apples-apples because I expect significant changes to my tune.
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Old 05-17-2007, 10:27 AM   #18
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brainy- did you ever do air temp test with the naca headlight duct? I'd be curious to see what ms shows the intake temp at with the naca covered and uncovered.
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Old 05-17-2007, 10:31 AM   #19
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Surface temps only....with the NACA duct the filter directly behind it was 85° on a 80° day (GReddy location w/ heatsheild). Without the duct is was closer to 160°. I wrote it all down then forgot to take it home with me....
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Old 05-17-2007, 11:17 AM   #20
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I wonder how a yellow kevlar naca duct would look on a black NB... I think a cold air intake like that is in my near future.
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