do these actually work ?? i dont rele want to spend 20 bux on something i wont be able to tell is there , it says better throttle response and 5-10 hp gain ??

 

I would probably say they'd work if you had other mods, such as an aftermarket intake, headers and such.... on a stock, probably not the desire you'd like... but then again maybe they do work... I think it prevents turbulence or something ... don't remember...

 

why would u need other mods like runners and etc ?? if it moves more air it will gain horse power even if there where no other mods right ?

 

an air foil I don't think moves more air, it settles it down ... my train of thought is, how can a 60 dollar part compete with a 300 dollars part such as headers or an intake manifold... I think you would see the numbers it advertises if you allow it to do its job... I don't think you'll see a 5 horsepower gain, but like I said before, perhaps you will... .. lets wait and see what other members who have used this device have to say...

 

It reduces turbulence and makes it more smooth for the air to enter the throttle body. If your car is completely stock, all you will get is better throttle response. I use the piece from TPIS and noticed a big difference but also I'm quite far from stock. Don't expect huge gains if you are stock or have a 305, try headers and exhaust, AFPR, or intake and runners instead.

 

On a flow bench, the foil increases flow

https://www.thirdgen.org/forums/alte...ctor-info.html

On a dyno, no power is made from either TPI or LT1. Spend your money elsewhere

 

True, everything I have ever seen shows increased airflow due to less turbulance in front of the throttle body. However when I installed one on my car I felt no difference and there was no difference in my 1/4 mile times either (bone stock L98 at this time), a SLP cold-air fixed that though... I think my airfoil has been laying in my toolbox or somthing since lol.

 

The effect of the air foil is increased cfm (more air incoming than without the air foil). More air means you should add more fuel (most don't and there's the issue).

TPIS commonly sells the airfoil with an adjustable fuel pressure regulator to avoid ECM calibration rework.

Many others have copied the TPIS air foil and sell it alone without an adjustable fuel pressure regulator. Don't expect much gain out of an air foil alone (without adding fuel).

Regardless, even on a stock engine, some would consider the small gains to be worth the money spent. Obviously if you're looking for big gains, focus on exhaust, heads, and/or cam.