Quote:
Originally Posted by wstar
Sounds like too much expense/complication for very little gain, but who knows. A throttle body probably doesn't make a very good intercooler, which is what you're basically trying to simulate. Also, if you actually achieved significant cooling at the throttle body, you'd be artificially leaning out the mix (denser intake air) post-MAS-sensor, so the car wouldn't adjust for it and might be more likely to knock if you went too far without adjusting the sensors and/or ECU for it. I have no idea what numbers it would take to do that temperature-drop wise.
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It wouldn't actually lean out the mix since the MAF reads all the air that goes through. Take it to the extreme to show the principle.
Imagine you make the air at the throttle a lot cooler. The contraction of air would create a vacuum and pull more warm air through the filter, past the MAF. Making it cooler allows more air to fit in the same space, it doesn't add oxygen to the charge, which is what would cause it to run lean.
Before someone thinks this is an opportunity to hi-jack this great DIY thread, this is one of those things that would really need to be a HUGE change and I agree with wstar, this is a great mod that simplifies the cooling system, doesn't heat the TBs and even saves a pound or two in hoses, clamps and the fluid inside. It's likely not going to add a difference that would be greater than the margin of error of the method that you use to measure. No one would likely disagree that this modification is a good move for those that don't worry about the TBs freezing shut (is that really a problem?).
OH AND BY THE WAY:
Where is the shot of the engine bay all put back together?