I have become wrong way corrigan
Yhep I unwhittingly have undone my best efforts to improve my cooling of the intake DCAI piping. If you recall that I did an insulation of my intake and temperature testing with probes to verify the gains.
It all worked and I see a 5 - 10 degree rise on the uninsulated pipe versus the insulated one. I was feeling good about the project and then realized something is really messed up. I have undesirably caused a great deal of extra heating without realizing it!!!!! POOP.
It you have followed my posts, the manifold insulation was to keep out extra engine heat on my DCAI design with the DUAL THROTTLE BODIES. THe theory of the throttle bodies TB is that two of them open faster than one by 100%, thus the opening is double the typical TB opening rate = better throttle response off corners for driving and autocrossing. After years of playing with it assistance from ROB, I just got them working without HICCKUPS or dead spots. THIS IS BEYOND THE SPRINT BOOSTER's IMPROVEMENTS, RED OR GREEN LIGHT!
OK old info at this point, the TB's Work and the insulation helps a good deal, maybe 10 degrees on my car and sure to be a bigger gain on your cars.
WHY, well in testing I only compared one inlet with the other to see the difference or gain insulation makes. I was fixated on the improvement and MISSED THE BIGGER ISSUE.
Ill not post all the data I gathered but in a nut shell the insulation is a good thing, period. What I just became aware of is that the inlet was about 140+ going into the supercharger. Thats crazy, the air temp was about 90 - 94 F and the inlet to the SC was 50 or more degrees higher. I was so focused on the insulation difference ( gain) that I overlooked the overall picture.
More testing and moving the probes to the inside of the DCAI pipes, I had a 40 degree rise from the front grill to the down wind side of my TB. The TB was heating the air something large. My TBs are located just inside the front radiator support where the radiator fan is blowing on it. Yikes, in one foot -yes 12 inches (at crusing speeds of 50 - 60 steady state driving) my air was being heated from 92F to about 140F.
No wonder the power was not as good as I wanted, my dual TB design works but its configuration is flawed as the TB's are running way over ambient temps due to the heating by the radiator;s fan.................... GOtta change that to move on.
Anyway, one step forward and much more to be had if I can get this layout improved.
This is a status report, since my air is so heated the insulation showed modest gains, your car should see better gains as the DCAI or CAI you have has cooler air and the insulation has a greater [cooler] differential, thus bigger gains than I have shown. ( Your 90 while Iam 140 in the same day temps).
FYI here what else I found in MY car underhood temps at a stop light rise to 160 - 170 even with my hood cooling. When driving for several minutes steady, that drops down to an under hood temp of about 120, MEASURED NEAR THE DRIVER HEADLIGHT HOUSING NEXT TO THE LARGE A/C HOSE.
oNE MORE TIME: the inlet air temps I am measuring are at the inlet to the SC. IAT is after the SC and intercooler IC. my IAT as Iam set up, is with ambient air temp running 90F in and about 105 at the IAT sensor. THis means that my supercooler is really carrying off much more heat than necessary. When I get the intake under control, the IAT should drop lower while cruising and similar gains to be had at WOT.
I did not muck this posting with all up with numbers but took a mess of readings while driving about 100 miles this weekend for tests. Mostly had an outdoor air sensor on grill, one in the DCAI pipe at the back of my TB and another at the SC inlet. Been in the right lane following trucks with the speed control on at 55 - 60 to keep stable conditions.
Its been interesting and challenging, enjoy. W
DY
https://en.wikipedia.org/wiki/Douglas_Corrigan
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Last edited by waldig; Jul 27, 2015 at 03:46 PM.