Now the third test that I did was noting the temperature differences after the heat wrap was applied. My turbo manifold was wrapped with DEI's new titanium heat wrap. I have a equal length manifold and all that was wrapped was the 4 runners and the tube running to my waste gate. Immediately a reduction in overall under hood temperatures were noticed (at idle). Another thing that was noticed was that the rate at which the under hood temperatures climbed were much slower then before (no wrap). For these comparisons I used the highest number recorded and the same amount of time was used to gather the results to try and keep the results as true as possible. Now on to the results:
Between headlight and turbo manifold:
Before Wrap:189 degrees
After Wrap:130 degrees
Reduction:59 degrees
Between Radiator and Engine:
Before Wrap:180 degrees
After Wrap:129 degrees
Reduction:51 degrees
Between Intake Manifold and Fire wall:
Before Wrap:202 degrees
After Wrap:133 degrees
Reduction:69 degrees (highest reduction yet!!
Hypothesis: Well for the most part it's pretty straight forward, however the major reduction behind the intake manifold has me thinking. Are the temps higher behind the intake manifold because it gets trapped between the intake and fire wall? Or is it because of the lack of air flow, because of aerodynamics? This is a question that I would like to find the answer to because judging by the results it has some bearing on IAT's. Now I would agree that most of the reason for high IAT's comes from the head heat soaking everything in it's path, but apparently the under hood temp influence has maybe been a little under rated? I don't know but the numbers don't lie. A reduction in IAT's was noted in all three places that temps were taken! The highest in IAT reduction was 14 degrees!! Now thats not a huge reduction, but when you boosted every little bit counts.
Performance Gains: I originally wasn't going to include this in the review but I kind of have to. After wrapping the exhaust and getting the idle temps I went for a little drive so that I could get the driving temps. Well it started raining and I didn't know if that would have skewed the results so I didn't record any data, however I did noticed a difference in my turbo spool times. Now I'm not saying that its a night and day difference but the reduction in spool time is noticeable. I pulled out of my neighborhood and gave it gas like I normally do, the car started pulling a little harder. I changed gears and tried it again to make sure that I wasn't imagining things. By the time I got to third gear I realized that I was imagining things and that the car was actually pulling harder. I wasn't able to record a datalog as I left my laptop at home. I will however record one when it's not raining. Stay tuned for more, next will be the 60 mph driving when its not raining.
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