Hey guys-

I want to install a TPiS AirFoil in my throttle body, but I am not sure where to purchase a unit. I looked at their website, and it says they cost $59.00 and advertise an 11 HP increase... can anyone back that up? Seems a little exagerrated...

Will any Auto-parts store carry them? or do they need to be ordered?

Thanks

-ONE2FLY

 

do airfoils work or not right? well yes at some level they do help. at WOT they may help some amount, i dont think it would be 11hp unless it was a much more sizeable motor then a 305 or 350.

are they worth it is up to you, at some point they deffinately help but 59.00 is alot. i bought 1 made by slp for 34.95 with no shipping charges off ebay. the only shop that will have 1 will be a performance shop and it may cost a bit more. take a look around you will find at least 5-6 companies making airfoils for tpi/lt1 motors.

 

Hey,

I bought the CompPolymers one from Summit, $36.99. Its plastic, and should work fine. It actually looks a lot like the TPIS one, vs some other designes.

I'll prolly end up making my own eventually anyway, but for now it works..

-- Joe

 

Dont bother. Save your money and buy a 52mm TB that comes with an airfoil. You'll get two mods for the price of one.

 

Kevin's got a good point...

-- Joe

 

If you have the money to throw around, I say go for it. I have the foil made by TPI Specialties and I am pleased w/ it. I am sure it's not worth 11 hp but I feel it made a noticable increase in power. Little mods. like this can add up over time. Just my opinion.

 

I put an SLP Foil on my 89 350, not a huge difference but the butt dyno noticed a little better low end throttle response & a little more pull after 4500, I stress little. You can get the SLP one from SLP directly for about $36. A worthwile investment.

Jay

 

I just got the TPIS one for xmas, I dont think it made a sizable diffrence, but it does sort of smooth out acceleration, and with a set of KNN's it cant hurt.

 

Thanks to everyone for the feedback, I didn't realize it wasn't as efficient as made out to be...

It seems like smoothing off the airflow into the TB would make a noticable jump in throttle response, so I am surprised at how many people don't think it's worth it, but perhaps a 52mm would make more sense...

I looked at it as a similar gain increase as K&N filters (5+ HP) or so. I still may roll with it, because little mods do add up over time. I guess I have to order them if they don't sell em in auto-parts stores...

At the same time, where can I get my hands on a 52mm TB? Are they easy to install?

-ONE2FLY

 

if you plan on doin some major mods to the motor, like cam, heads, headers, then you will benifit from a larger throtle body. its like goin from a 650 cfm carb to a 800 cfm on a mostly stock 305. throttle body sizing is sort of like carb sizing, stock on a tpi is like 650 cfm. quite enough for a 305 and good for a 350. it all depends on how much air you plan on moving, but the larger TB may hurt you till you get the rest of the motor up to speed with it.
To me it wouldnt make sense to build your motor around your induction. Of coarse I may be wrong, its just my opinion.

 

I got a tpis one that I will sell you for 20 bucks. Its never been used.

 

Well put. I second that.

 

Thanks again guys

You got mail

-ONE2FLY

 

EFI throttle bodies are not like carb's. Carb's flow both fuel and air, EFI only flows air. By putting a larger throttle body on your TPI, you increase the amount of that air can enter the plenum. More air is good, however, bigger is not always better.

 

I was just gonna say that. Why would he want a 52mm TB with a near stock engine of that ci. thats not going to be heavily modded?? That wouldn't be good. Get the airfoil. Its not going to make that much of a difference on a near stock engne, but it will make some for the good.

 

In a way kevin you are right. If he were to go to a larger TB though, he might wanna think about portin and polishing his TB bores on the plenum, getting some aftermarket runners, siamese and port mathc them, and/or port match the stock base or get an after market one and do the same, along with some higher pound injectors, and an AFPR, that would make for some really good top end power, but then he may also wanna get a good chip or a custom burned job. Like I said, its good, but then he just built his motor around the TB.

 

At 85% Volumetic Efficiency, a stock 305 that pretty much pulls til 4500 requires about 340CFM.

Save your cash.

-- Joe

 

numbers dont lie

 

I am not planning on making my car into a beast, so all this talk about porting runners, new injectors etc... isn't in the near future, if ever...

I'm just trying to do a few little-medium bolt-on mods that will increase my performance over time. For the most part, I want to keep things pretty much stock since it's a 1990 and a collecters car as it is.

The biggest mod that I have planned for the car is ceramic coated headers, which will really improve horsepower.

It really seems like an air foil makes sense, since it prevents air from getting trapped between the butterfly valves in the TB, but I guess I'll find out after I install it!

Thanks guys

-ONE2FLY

 

One2Fly you got mail. As soon as i get your address the part will be at your door.