Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
Thanked 54 Times in 52 Posts
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foil is an insulation, underhood heat is likely heating air as it passes from intercooler to turbo... I wouldn't think it would be enough to notice, but if you're watching gauges like a hawk now, you might have just hightend your awareness more than before... however, I have to agree, since I removed the foil on my yellow truck last year, it also seems to take forever to get down to 300-350 on my EGT's before I shut it off...
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
'00 F350 extcab, 9' utility bed, dually 228k
E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
'00 Excursion Limited, 7.3PSD 294k
'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k