Loco Honkey
Banned
Originally posted by beerbongskickass@May 11 2004, 04:33 PM
Your statement that they are worthless and worse than having no intercooler at all is not true and just ignorant. If anybody believes that statement they are just as ignorant as you are. :roll:
The only reason I'm still replying is not to further your knowledge, becuase you're too far gone into the "me too" crowd to have a clue. I'm doing this for the guy that started this thread, and for those that are on the fence.
I'm about to head out for dinner, but I promise you, by the end of the week, I'll post some mathmatical formulas that prove that the johnnyracer IC is worse than none at all. My statement is as such:
The IC in question will cool the charge for approximately two full gear pulls. Once you're in 3rd gear, the IC is heat soaked. Once it's heat soaked, it will not cool the charge any more. Once it's heat soaked, it becomes a restriction. Once it becomes a restriction it adds to the heat. Once it adds to the heat already produced by a turbo that's overworking by 4 PSI, you have a condition that's worse than having no IC at all. Here's some approximate numbers to give you an idea what I mean... I'll post factual numbers later on...
A turbo has an outlet temp of 200° at 6 PSI, and without an IC, this is the charge temp the engine sees. Now let's add that wonderful IC and see what happens... The turbo has to produce an additional 4 PSI to overcome the pressure drop of the IC, so the outlet temp is now 265°. Because the IC has a poor cross sectional area, and because it's so long, the charge temp will only drop to 180°, but will lose 4 PSI in the process. This happens for two gears at WOT. After that, the IC is an interheater. The turbo is working at 10 PSI and 265°, and after going through the heat soaked IC and being heated further by the restriction, we're upwards of 300° charge temps in the intake manifold.
Again, these numbers are based on what I've seen turbos over the years produce, and will vary from turbo to turbo and IC to IC, but I'm willing to bet that they're not too far off of what's happening.
Still wonder why the guy was able to hit a 12 second run? Well, a JR supercharger puts out around 280° charge temps at 10 PSI, and I'm sure you've heard of at least one 12 second supercharged B- powered 4th gen Civic... I can promise you that if that guy took his IC off and ran the turbo straight to the intake manifold, his power levels or times wouldn't get worse.
Anyway... factual scientific math will come later this week. I'm off to dinner.