Sean,
Honestly I'd brake boost in 4th gear because regardless your goign to lose a little bit of time having to shift. You make enough power where when its in boost it will not really matter that your in a lower RPM.

LOL about the your side of the family comment LOL!!

 

1. Congrats on the boy! No girl problems to deal with, and a buddy to with cars!

2. Congrats on the CTT!

3. I hope your son doesn't look at this in 15 years and see the first thing you ever said about was that he had small *****.

 

keep hitting minus haha GL

 

You guys have clearly never driven any slow cars That has been the case for every car I've ever driven with AC. In many sub-200 hp cars on a hot summer day, you can actually feel the difference if you turn it off while accelerating. Nothing unique for the GT2/TT.

 

I could feel it in my stock Mustang GT and in my G35 (which makes about 350 to the crank)

 

On both of my previous DSMs, one of the mods I did was to remove the AC entirely once I had the engine out - compressor, condenser, lines, belts. Made a noticible difference in acceleration with less drag from the belts and the weight savings. Too bad they were both black with black leather. Summertimes were a biotch.

 

Windows up at the track?

 

hmmm... I heard the opposite. The AC takes about 2-3 hp.

 

Considering that the AC switches off durning WOT and then turns back on it would not use any HP overall at that point. I have dynoed the cars with the AC on and off and the numbers do not change for this reason. One can assume that the cooler fuel would help cool the back of the valve faster under a long run. We use to do this when we were broke building high CR engines. We would dump lots of fuel not for the fuel but for the colling effect on the back of the valve.

 

I would think that the parasitic losses from running the compressor outweight the gains from cooling, no?

I mean, if you look at the system, this is a zero sum game. You can't gain energy, just move it around.

 

Not really. The container is rather large so unless you have a volume drop or a pressure drop then you would gain more by cooling the valve.

 

If that is true, where is your horsepower gain on the dyno. You already posted that it makes no difference. I agree that cooler gas is beneficial, but running the A/C is not a way to do it to gain power.

 

You are taking my post out of context. My point was it does not subtract any HP because it switches off at WOT. I have not run a test specifically with the AC off for a series of prolong runs and therefore have incomplete data. Meaning the unit should remain off for all the runs, idling, etc. I can run that test if anyone REALLY wants to know. It is built in the car so I doubt anyone would remove it.

 

What about using "Air Conditioning Technology" in a more direct means to cool intake temps? Like piping AC lines through your intercoolers for example?

 

Congrats on the boy buddy, btw PS2's should be fine once warmed up, they stick amazingly well for street performance tires , goodluck at the track and be safe