Do air foils on the throttle body make a difference?

[apyah]

just wondering if these make any difference at all

Brand New TPI Throttle Body Air Foil L98 LT1 1985-96 Corvettes!! Also fits 85-97 Camaros, Firebirds, and Impala SS with 305, 350 TPI V8 engine. This Kit will IMPROVE Air Flow to your engine by 40 CFM resulting in approximately a 6-10 HP/8-13 ft.lbs. of torque gain! Simply add this Air Intake Foil to your throttle body and redirected the air straight into the throttle body butterflies resulting in maximum air flow,thus significantly increasing horsepower!

[jakes_GSXR]

You will probably see a little gain when your pushing 500 hp or more.
I've got one on my little 350.
Yeah, I'd buy it.

[shawnc16]

honestly for 50 bucks.. It aint worth shit. If you buy an aftermarket TB it will have it already. It doesnt do shit.

[transampimp]

I paid $30 for mine off ebay several years ago. I noticed an increased sucking sound in the intake. If you look at the throttle body you wonder why this was never machined into it right off the bat. I would buy one, just don't spend $50

[DanO]

i always hate how they say "40 CFM increase"

increase at what condition, what pressure drop, total flow rate, etc..????

its a proven fact that things like this arent truly tested, they just "look cool" so people would buy them.

[tenpin842]

I even bought one for my 305. But I paid $20.00 for mine.

[MP81]

I'm trying to find one for like $20. I really don't want to spend more than that...

[TenaciousB]

Hp to $ ratio isnt exactly optimal at $50. I'd pick it up for $25 or so.

[b.lee]

I've always heard they are for suckers?
and can lower hp.

[VirginBreaker]

waste of time and money

[Virtue]

x2 waste!

[WMCC SSLS1]

Back when I used to run TPI stuff I had a noticeable gain on both a 305 and a 350 engine and would recommend it. Of course find the best price you can and even look for a used one as nothing can go wrong with them obviously. $20 to $30 sounds good and remember people spend $150 + on the LS1 cars for a similar gain from an air lid which is just a piece of vacuum formed plastic. The air foil won't give you 50 magical HP but is will help throttle response much like porting the TB on a LS1 engine.

Somewhere around here I have an OLD copy of a book from TPIS from the 80's where they went step by step and changed pieces like the air foil, air filter, runners, plenum, milled MAF heat sink fins, and they even tried a Corvette air box stock and modified, Camaro and Firebird air filter boxes. Each piece was attached to a flow bench to measure the airflow change in CFM. I don't have the exact numbers in front of me but the air foil did increase the CFM through the throttle body which makes sense as the GM TPI throttle body is about as aerodynamic as the front of a city bus.

[WMCCjames]

Back when I used to run TPI stuff I had a noticeable gain on both a 305 and a 350 engine and would recommend it. Of course find the best price you can and even look for a used one as nothing can go wrong with them obviously. $20 to $30 sounds good and remember people spend $150 + on the LS1 cars for a similar gain from an air lid which is just a piece of vacuum formed plastic. The air foil won't give you 50 magical HP but is will help throttle response much like porting the TB on a LS1 engine.

Somewhere around here I have an OLD copy of a book from TPIS from the 80's where they went step by step and changed pieces like the air foil, air filter, runners, plenum, milled MAF heat sink fins, and they even tried a Corvette air box stock and modified, Camaro and Firebird air filter boxes. Each piece was attached to a flow bench to measure the airflow change in CFM. I don't have the exact numbers in front of me but the air foil did increase the CFM through the throttle body which makes sense as the GM TPI throttle body is about as aerodynamic as the front of a city bus.

Gotta love that old TPIS info!!!! I have that same book floating around here too...that was my bible back in the day.

[shawnc16]

If it "added 5 hp" it probably didnt add any hp.... dyno numbers are always different after each run.

Save yur money.. buy something that is going to net you legit power gains

[MP81]

I'm pretty sure it helps with throttle response, though.