Recorded Underhood Temps. - Session 2
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Joined: Mar 2001
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Recorded Underhood Temps. - Session 2
If you haven't been following this go to this thread for background: http://www.s2000online.com/forums/showthre...?threadid=19725
Read the data and I'll tell you after what mods I incorporated. Again, a brief legend:
Probe A - Between sheet metal near rocker panel just in front of left door (for ambient readings).
Probe B - Inside airbox hanging over JR filter, in contact with filter.
Probe C - Inside rubber intake tube 2-3" in front of TB.
Probe D - Suspended high up in engine bay between TB and left fender wall (position changed due to mod).
Recorde Run #1
-stop & go traffic
-speed up to 80 kph
-I'm not recording D as often since this is a known factor from previous runs and I've had to move the probe's location because the mod took up that space.
1.(time@0min.)-left for work. A=25.4; B=31.1; C=34.7; D=33.0
2.(1.5 min.)-3 bars. A=28.2; B=28.9; C=30.7; D=?
3.(10.0 min.) A=31.7; B=29.9; C=33.9; D=?
4.(15.0 min.) A=30.7; B=30.0; C=36.0; D=?
5.(27 min.)-arrived@work. A=28.4; B=28.9; C=36.4; D=54.0
This most resembles my Run #3, Session 1.
Can you see what's happened? AMAZING!!! The airbox temp does not rise much and sometimes even lower than ambient due to moving air. The intake tube temp rises only slightly now compared to before and when it does rise, say at a stoplight, it comes back down within 1 min. of the car moving. Note that this run was done in the highest ambient temp yet. Here's what I did:
(couldn't find the stuff that was recommended to me the last thread)
1. Bought a roll of pipe insulating tape (2" wide), the kind that is 1/8" compressed styrofoam with a silvery metallic lining on one side. I wrapped the rubber intake tube as completely as I could with it (NOT a pretty site).
2. Bought a roll of aluminized insulation tape (6" wide), the kind that has 2 layers of crinkled aluminum with plastic bubble wrap in between (total thickness - 3/16"). I slid this between the airbox intake horn and the top of the rad. I covered the entire top of the rad area from the front side of the airbox to just beyond the foam rad cushion (back to front) and the whole width of the hood opening (side to side) with one layer, duct taped it all down (again, NOT a pretty site).
But look what it accomplished! The airbox now gets ambient temp air and does NOT heat up significantly. The pre-TB temp rose by about ONLY 20% higher than ambient @ the highest, 10% @ lowest. This compared to Session 1 (50% or more). I'd like to do another run in case this was a fluke before I make my next mod.
Read the data and I'll tell you after what mods I incorporated. Again, a brief legend:
Probe A - Between sheet metal near rocker panel just in front of left door (for ambient readings).
Probe B - Inside airbox hanging over JR filter, in contact with filter.
Probe C - Inside rubber intake tube 2-3" in front of TB.
Probe D - Suspended high up in engine bay between TB and left fender wall (position changed due to mod).
Recorde Run #1
-stop & go traffic
-speed up to 80 kph
-I'm not recording D as often since this is a known factor from previous runs and I've had to move the probe's location because the mod took up that space.
1.(time@0min.)-left for work. A=25.4; B=31.1; C=34.7; D=33.0
2.(1.5 min.)-3 bars. A=28.2; B=28.9; C=30.7; D=?
3.(10.0 min.) A=31.7; B=29.9; C=33.9; D=?
4.(15.0 min.) A=30.7; B=30.0; C=36.0; D=?
5.(27 min.)-arrived@work. A=28.4; B=28.9; C=36.4; D=54.0
This most resembles my Run #3, Session 1.
Can you see what's happened? AMAZING!!! The airbox temp does not rise much and sometimes even lower than ambient due to moving air. The intake tube temp rises only slightly now compared to before and when it does rise, say at a stoplight, it comes back down within 1 min. of the car moving. Note that this run was done in the highest ambient temp yet. Here's what I did:
(couldn't find the stuff that was recommended to me the last thread)
1. Bought a roll of pipe insulating tape (2" wide), the kind that is 1/8" compressed styrofoam with a silvery metallic lining on one side. I wrapped the rubber intake tube as completely as I could with it (NOT a pretty site).
2. Bought a roll of aluminized insulation tape (6" wide), the kind that has 2 layers of crinkled aluminum with plastic bubble wrap in between (total thickness - 3/16"). I slid this between the airbox intake horn and the top of the rad. I covered the entire top of the rad area from the front side of the airbox to just beyond the foam rad cushion (back to front) and the whole width of the hood opening (side to side) with one layer, duct taped it all down (again, NOT a pretty site).
But look what it accomplished! The airbox now gets ambient temp air and does NOT heat up significantly. The pre-TB temp rose by about ONLY 20% higher than ambient @ the highest, 10% @ lowest. This compared to Session 1 (50% or more). I'd like to do another run in case this was a fluke before I make my next mod.
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From: Sheridan
Excellent experimenting. Thanks. I'd love to see pictures of "not pretty."
I think you have to be careful when you say, "The pre-TB temp rose by about ONLY 20% higher than ambient @ the highest, 10% @ lowest. This compared to Session 1 (50% or more). I'd like to do another run in case this was a fluke before I make my next mod."
If you are talking about a percent rise in temperature, you better use an absolute temperature scale rather than celsius or fahrenheit.
I think you have to be careful when you say, "The pre-TB temp rose by about ONLY 20% higher than ambient @ the highest, 10% @ lowest. This compared to Session 1 (50% or more). I'd like to do another run in case this was a fluke before I make my next mod."
If you are talking about a percent rise in temperature, you better use an absolute temperature scale rather than celsius or fahrenheit.
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Thread Starter
Joined: Mar 2001
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Barry WY Silver/Black '01, thanks for the explanation and of course you are very correct in your assessment. I just couldn't think of any other way to put it such that the masses could understand and see the dramatic differences I recorded. Perhaps I might try to express the results in terms of % difference in change of the already documented change. I don't know whether this or talking in degrees Kelvin is more confusing. Or I could just leave the data for people to analyze and just say something like, "Holy begeezus, will ya look at how that didn't go up (or down) as much as last time!!!"
It's getting late and I'm at work (no camera). I'll put up some pics tomorrow morning.
It's getting late and I'm at work (no camera). I'll put up some pics tomorrow morning.
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Joined: Jan 2001
Posts: 6,455
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From: Glendale/Burbank/LA
Cool! I knew I bought that Reflectix stuff for a good reason last night. 
I'd be very interested to see what happens after stopping @ the store for a few minutes and when sitting in your garage for 30 minutes after a run -- you know, where those temps went crazy high in Session #1. And pics!!! =) You the man xviper!
I'd be very interested to see what happens after stopping @ the store for a few minutes and when sitting in your garage for 30 minutes after a run -- you know, where those temps went crazy high in Session #1. And pics!!! =) You the man xviper!
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Joined: Oct 2000
Posts: 4,762
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From: Sheridan
Originally posted by xviper
Perhaps I might try to express the results in terms of % difference in change of the already documented change
Perhaps I might try to express the results in terms of % difference in change of the already documented change