Very true. The difference is not even measurable. Power is determined by fuel injection quantity, not air temperature. At 6psi going down the highway the temperature increase is negligible.

Agreed.

The cooler air will result in more hp (marginally more) with the same amount of fuel. The engine is more efficient with the cooler air.

Key word. I had zero power and economy difference with and without my intercooler. If it actually made a difference I wouldn't have gotten rid of it.

FUEL is what controls power. Intercoolers only make a difference at WOT where temperatures are high and the A/F ratio is close to rich. Daily drivers and highway cruisers won't see a bit of difference by adding an intercooler except an increase in turbo lag.

One observation on one car does not make a conclusion for all. Until a study of considerable number of similar engines and conditions with controlled variables targeting this aspect alone is made statements otherwise are without merit. Marginal is the key word and BC is correct to use it. ZERO is a absolute and marginal means just that- marginal. One percent difference could be marginal and that figure is well below your observational skills on one car to discern. The forum would be better off without off the cuff absolute statements such as this.

Yes, it does, especially when its much more than the Butt Dyno most people here use.

As you so clearly state, 1% is unobservable and worthless. There is no point in spending money and many hours of work for NO appreciable difference. This isn't a competition where 2hp makes the difference between winning and losing and any gain is worth the cost, these are daily drivers and people with budgets. Graminal95's case is one that merits an intercooler because his combustion needs to be kept as cool as possible to make up for the lack of proper piston oil cooling. Telling the AverageJoe adding an intercooler will increase power and economy to their 99% stock car is misleading and counterproductive.

Go build an HHO generator, they're about as useful to a daily driver as an intercooler.

If you want more than 1% difference, do something worthwhile like swapping in a VNT or removing the muffler. Until then, this forum would be better off without people like you trying to delude others.

You talk down to people here and assume (note there are no below the belt italics here) they are not able to understand the difference between marginal and absolute. You argue an absolute that is false. I argue that marginal is marginal. That is the only issue here.

I discourage people from making mistakes, big difference.

I assume they are smart enough to figure out the difference between absolute and approximation without the need for every minute detail to be explained.

I argue that "marginal" means insignificant, not worth the cost and is only of "round up/down" value. In the case of 99% of the people here, an intercooler is "round down" in effectiveness.

The issue is that you feel the need to be argumentative of everything I post just to be a pain.

So you agree that you were incorrect in your absolute "zero" statement? A simple yes or no will suffice.

I never made an absolute statement, you continue to make assumptions despite the simplified decription I provided for you in the post above.

Here to refresh your memory.
Brian said marginal, you said zero.

Here is a reminder of what I just said a few hours ago.

Hi,

I am currently installing my GT23V. The flange was made to keep the position of the original turbo inlet. I want to keep my original air filter with the u-shaped connection (to keep the original look).
This means I keep the original manifold. Now I have to run the inlet tube within the u-connection. It works but I can only do it with a 2" stainless steel welding thing that should run down between frame and alternator (SD) after passing the u-connection.
The plan is to install an IC behind the bumper.
The question is: Is 2" IC tubing too small? What is a good compromise for reducing the turbo lag and flow resistance?
The turbo outlet is angled so a direct connection to the manifold is also difficult to do.
Please comment.

Tom

Excellent qualifier. So an IC alone will result is marginal effects- got it.
I think you'll be have lots of twists and quite a long path to and from the IC. That alone will result in more lag. A straight pipe has less flow resistance than a pipe with turns. More turns= more resistance. Keeping the original air filter housing means you'll be cramped for space- but less than a w123. Cramped means tighter turns. I'd think about the options and not keeping the stock air filter.

2" is fine. You might consider 2.5" if you're going to go much past 14psi.

Modify and weld? Its what I did to simplify tubing on mine. Its not pretty but it works pretty well.

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The fact that you are a mile high has something to do with the reason you didn't see much. The thinner air isn't going to cool as well and the change in trapped mass per cylinder won't be as great per the same temp change as it would at a lower altitude.

__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

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