Anyone seen any difference between the various airfoils, i.e, TPIS, JET, Holley ect. Anyone tried a few different ones and seen any noticeable difference.

 

Look for around 5-7 HP with any of them. They all do the same thing -straighten out incoming airflow into TB. Find the cheapest one you can get. I run the TPIS unit on my 350 TPI and didn't notice much of any improvement.(I bought it used for $35 shipped)

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89 IROC-Z 5.7L
130,000 MILES
2.77 GEARS
K&Ns FILTERS
ALL FREE MODS
FLOWMASTER MUFFLER
PERFORMANCE RESOURCE CHIP
Best 1/4 E.T. 14.37 @ 95 MPH
Best 1/8 E.T. 9.22 @ 76 MPH
Best 60ft. 2.07

 

Air foils make a great paperweight..they gain ZERO HP and do nothing..dont waste your money on one.
I followed a few threads of some serious 1/4 mile bracket racers and they tried the variousiproducts and stuffs on the market ..no 1/4 mile gains at all.

The stock TPI flows enough VE of air for a 305 and even supplies enough for a 350 engine albeit with a low peak torque line.A air foil isnt goint to change pressure in the engine.
When you can draw/add or force more air into a motor and change the pressure in there, you can make power that way.

 

Or you could be a kook like me and make a homemade airfoil w/ epoxy putty. Just fill in the area between the blades and don't forget to leave good sized holes for the IAC and PCV vent.
Much cheaper than buying one and i'm sure it's worth the same gain (slim to none)
...ed

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Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

I recognized a zero gain but I already knew that. I put one on because it gave it a finished look, kinda' like something GM shoulda' done in the first place. I got a new SLP for 29.00.

 

I have a Hypertech airfoil (basically a TPIS piece) and did not notice any SOTP but the throttle response was much more crisp than with out it.

 

My opinion is if you can get one free or next to nothing, then get it.

If you gotta go pay the money for a brand new one then save the money for other mods...its not worth the price.

I got mine from Modern Musclecars going out of business sale. I bought a LT1 throttle body that had it for $20 then sold the TB on here for $60.

I love deals like that. Got paid $40 for using that airfoil



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Mike L.

"If it feels good - stay in it "

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

I bought one from Mid America designs for $30. Only difference was in the sound. I could hear the air rushing in better but car was not any faster.

 

I got mine for $20 from some dude that works at PAW

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91 z28 lb9 5 speed - hooker 1 5/8 headers - high flow cat- full 3 inch exhaust - home made ram air - tpis airfoil - dual chamber flowmaster - Stage 2 Jet Chip and 160 stat - 8 mm Msd plug wires - 55,000 v hypertech coil/rotor/distrib. cap - Mac. White face gauges - lots of sound system crap...

 

i got mine for free

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1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://discussion-board.com/GreaterC...dyAssociation/
http://www.cincyspeed.com/

 

I bought the Comp Cams one thatis made of plastic. It fits nicely into the throttlebody, and the piece that fits into the back of the throttlebody to hold the piece you actually see does not seem to line up with anything.

I called Comp Cams, the first guy I spoke to told me that he would NEVER own a Chevy because they were to slow... And he didn't know Jack. (keep in mind he WORKS for Comp cams as a tech), At least he sent me to someone who was familiar with the product.

This guy spoke about something that you take out of the throttlebody and relpace it with the piece they sent with it. HUH, look I am no Rocket scientist, but from what I can tell there is nothing to remove to put this stupid thing in. I might have misssed something, but I have three Stock Throttlebodies, two 87's and one 89, and, ahem..sir I think you are smoking something.

I am sending it back.

Unless one of you knows what the heck is going on, and help me.

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87 Formula 5.1 converted to TPI Yellow/Black
SLP Dur 206/212, Lift 480/487, Cent Line 112 cam, SLP headers, SLP cat-back exhaust
K&N Airfilter
Modified Stock cold air intake
Ported & polished Stock TPI intake
Holley Adjustable Fuel Press regulator
AC Rapidfire Spark Plugs.
Gil Younger (no yo-yo) Shift Kit
Aluminum Driveshaft
3.73 Posi gear
Baer 12" brakes 4 wheels
KYB AGX Adjustable Shocks & struts
Hotchkis strut tower brace
South side machine frame connectors
Custom reinforced control arms and pan hard bar.
Custom Leather interior
CUSTOM Yellow Gauge Faces

87 Formula TPI (5 Speed) Yellow/Gray STOCK

1967 Buick Riviera 430hp Turns high 14's (Not bad for 4300 lbs)

83 Camaro (Parts)
83 T/A (parts)

http://www.3rdgenformula.com

 

You have to take the top cover off the TB to put that little tit with threads in.

If you take the top plate off (say Tuned Port Injection on it) you will see right in the middle a hole. Drop that tit down in the hole with the threads facing towards the front of the TB.

NOW YOU GOT SOMETHING TO SCREW IT INTO

If I didn't explain it good enough, I'll draw you a pic and e-mail it to you.


------------------
Mike L.

"If it feels good - stay in it "

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

ahhhhhhhh, ok, now don't I feel STUPID?

Oh well, not the first time, Wont be the last either. The thing did not come iwth any !@#$% instructions. And the Tech guy was less helpful.

John

 

Obviously the little dweeb dosn't recognize which side his bread is buttered on, or who supplied the butter. Did ya get his name? If so, I would send a friendly message to CompCams Sales Dept: Attn V.P. Sales.

Thankfully the rest of the company is not as moronic as this idiot. A quick glance through their latest catalog tells me they make more different cams for different Chevy engines than they do for all other brands combined. Hmmm, wonder why that is?

 

Btw, if you want to know which POS, ill-fitting, hunk-o-crap airfoil to avoid like the plague, I've got three letters for you,...

J-E-T

Considering any airfoil you buy will cost you $30 - $60 for something that costs the manufacturer less than $5, and is unlikely to give you a noticeable gain, I'd say spend the money elsewhere.

Like a good set of plugs. Or an oil change. Or a good set of plugs and an oil change!

 

Ed,

You mean like this?



I guess we both have too much time on our hands...

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

I bought a TPIS airfoil and even with 200,000+ miles on my engine I noticed a definite throttle response increase and the car pulls harder from 3500 to 5 grand and I'm sure it'd pull much farther than 5 grand if not for my ****ty stock ignition and stock cam that cuts off at 5!

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1986 Trans AM
305 TPI
Well over 200,000+ miles (speedo/odometer non-funtional! Odometer reads 142,000)
4 Wheel Discs
9 bolt Borg Warner Rear (2.77's....oh joy) :P
Completely Stock
Current Project: upgrade to a 355 TPI, 6" rods, 9.5:1 Compression, Stock TPI ported, 24#/hr LTI injectors, Hedman Shorty Headers, SBC Stock Casting heads pocket ported, Comp Cams XE262-14 TPI Cam, Ed Wright Fast Chip, Holley AFPR, TPIS airfoil, MSD wires, MSD 6-AL Box, Hypertech hot coil!!

 

just get a new tb with one in it thats what i did and only cost me $300

 

Hey your only 3 years and 1 month too late..... impressive

 

didnt even notice that

 

Man! you get railed if you use the search and you get railed if you don't. JK I would have said it too if I caught it first

 

just had to put in my $.02 plus its a very serious issue

 

Like runners the airfoil is useless if the rest of the intake is stock...
If you have a coldair setup /ported maf (if you have one)/plenum it will have a small gain..

 

I don't remember the magazine or the test but I did see one where they used a Holley air foil and it did give them a HP and TQ increase at the rear wheels, not much, less than 10 each, but it did show an improvement. I have a TPIS airfoil, I couldn't tell a difference when I put it in, but that was with the stock motor. A deep breathing stroker motor probably will benifit from it.