bcty

I know that on n/a cars it doesnt make a huge difference compared to turbo cars but how much of a gain are we looking at for turbo cars.. I would say for n/a's maybe 5hp at the most and more upbeat feel the to engine.. but on turbos where it matters the most what type of temps could give what gains? I built a 3" mandrel bent TID on my turbo and I was seeing frost on my intake and AFM as cold as ice.. Wondering what type of gains would I see in air temps when its like this over when the temps just ambient?

And I was also wondering whos boosts hard in 4th and 5th gears? I heard from someone around here its pretty hard on your drivetrain due to the stress.. I genrally tryed to stay out of boost in 5th gear as much as possible.. Just wondering how hard you take it in these gears!?

Thanks Guys!
Tyler

1987RX7guy

iTrader: (3)

I will get back to this thread in maybe a month or so when I dyno the TII version of our intake. Hopefully I can pull off the dyno on the N/a intake for this comming december. damned holidays!

bcty

how are you hoping to get cold air on the dyno.. factor in the windchill that a cold temp unless your gonna run some a/c into your intake or hood up your intake to a freezer!

1987RX7guy

iTrader: (3)

well I am hoping to rent some LARGE fans. But I don't expect to get a 100% accurate reading from it.
sony boy there ain't been no chill round here for 53 and a half years. Don't you know I live in texas. Its a freaking desert!

bcty

haha.. borrow a beer fridge and make it freeze and cut a 3" hole in thw side and use that.. let me know how that goes

1987RX7guy

iTrader: (3)

I don't know about a freeze that might freak the dyno people out. But I will get back to you guys.

bcty

Any takers?

scathcart

Sure, why not? I go all out. Top speed runs. I don't see it being a problem.

When TII trannies do fail, they typically lose the 1st, 2nd, 3rd gears if they don't completely grenade and take out the whole tranny. If this were true, wouldn;t 4th and 5th be the typical failure modes?

Also, I believe the gains for CAI are over-rated. We're yet to see any numbers for it, and a well-designed heat shielding box would net you 90% of the gains. The stuff sells on APC propaganda.

I would be interested in a cure for intake manifold heat-soak, like a phenolic palstic lower intake manifold.

Evil Aviator

First of all, you will understand this whole engine performance concept if you realize that things you do to the car usually multiply power rather than adding it. Given that, the intake air temperature rule of thumb is 1% horsepower per 6degC or 11degF. The actual equations and variables involved are extremely complicated, but the rule of thumb should give you a good general idea.

That sounds like a standard venturi effect. Sorry, no performance gains here, but rather a slight overall loss.

Wind chill factor is how cold wind feels on your skin. I can see where you would think it would help your engine produce more power, but unfortunately it has little to do with your car.
http://www.nws.noaa.gov/om/windchill/index.shtml

The fans aren't going to do anything. The goal of a "cold air intake" is to initially pull air into the engine that is the same temperature, or at least close to the same temperature, as the ambient outside air. It is probably better described as an "anti-hot air intake", or if you are an engineering geek, a "thermal normalized intake", lol. Some type of special cooling system (N20, CO2, etc.) would be required to cool the intake air below the ambient temperature.

88IntegraLS

While we're on the subject, who has an opinion on intake manifold insulation devices? Ie. devices that reduce heat soaking of the intake manifold.

Evil Aviator

A friend of mine has a Nylon 6/6 performance intake manifold for his SLP Camaro. It's light, it's a good insulator, and I'm sure it is easy to manufacture with good internal flow. I don't understand why anybody still makes performance intake manifolds out of metal.

version13

I used aircraft grade aluminum and the put a double coat of high temp exhaust paint. I think that it works pretty well.

HAILERS

Just off the cuff, I think putting the pedal to the metal in fifth gear at anything over 3000 rpm is just fine. Even better going up a grade. Sort of a method of seeing if your car has any guts or not. Just don't lug it in fifth. I'd say a turbo car in fifth gear at 3000rpm pulls better than a non-turbo in fourth gear at 3000rpm. Just rambling.