Twilightoptics

'85 Z28 305 TPI

What is an air foil, how hard is it to install,and what exactly does it do?

Porting the plenum: How hard, and what exactly do I drill out?

I'm not extremely familiar with the TPI system, other than seeing it for about a year, and tinkering. I've got a haynes and chilton book....?

3504mula

An air foil is about 40 dollars out of any performance magazine. It is supposed to create a smoother air flow and it only takes about 5 minutes to install. I would go ahead and pick up a K&N filter too if you don't have one.
Porting the plenum can take up to an hour after you get the plenum off if you do a good job. It is kind of hard to explain, but there is an article in the tech section. Hope this helps.

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1990 Formula 350
*Hooker Headers
*Flowmaster 3" Catback (no cat)
*Accel AFPR
*K&N
*Airfoil
*'99 16x8 Formula Wheels
*Metco Lower Control Arms

theformula

SLP sells the airfoil for around $30. Mine was $25. Porting the plenum is fairly easy. You'll need a rotary tool of some sort. Might as well make a homemade adjustable fuel pressure regulator while the plenum is off.

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91 Formula
305 TPI 5speed
1LE/G92/WS6
K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(47psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires,Bosch O2sensor, SLP headers & catback,3:73s w/Auburn posi,180* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.
Street legal with stock throttle body, runners,intake manifold,cam, and heads.

Twilightoptics

How do I make a homemade fuel pressure regulator? What's it's purpose. I don't know what kind of pressure I need. Is it like... I want to go fast, I give it more pressure, or what? Why would I want it adjustable? Thanks

mirage2991

Forget the airfoil, it's a waist of $$, neveer felt of did any diff on my car, if you are going to do mods, then do mods, don't play around....porting your plenum will give you a good improvement that you can feal, K&N's are good for the fact that you can clean them and never buy filters again. Save the 40$ from the airfoil and get some good set of wires or some gauges or best, buy a fuel regulator so you can "tune" you car a little bit better.

My .02$ rock on!

rondubbs

http://members.aol.com/mmmm999/3rd-degree/tips/tips.htm

search and bookmark this site , it will help you out in your questions.
plus look on ebay for a cheap airfoil.

ws6transam

How do you port a plenum in one hour and still do a good job?

My best time so far is just under two hours. That's with a 25,000 RPM Ingersoll Rand Cyclone pneumatic die grinder, three long-shank aluminum carbide cutters, one short-shank aluminum carbide cutter, and various coarse and medium grit sandpaper rolls.

I've done about half a dozen plenums to date.


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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.

JOEL89FORMULA

I ported my plenum in about an hour too. I used about the same tools you did (maybe less) and did a pretty good job I thought. It took a lot longer to take the plenum off and put it back on, but I think I would pass out after 2 hours of just grinding and sanding. I don't think he was trying to give an exact time period anyways. Maybe I didn't do as good of a job as I thought?

Joel

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1989 G92 TPI Formula
Random Technology Exhaust
Accel AFPR
Air Foil
K&N
MSD Ignition
3.73's (I think)
White Face Guages
Pro 5.0 Shifter

theformula

So what you're saying is that the wires you're recommending is a "real" mod.?

All mods don't have to be big ones. Do a combination of little ones . Plugs alone won't do much. But maybe plugs with low resistance wires and an MSD coil will...

Airfoil increases airflow very slightly. Dyno rwhp varies from 1 to 7



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91 Formula
305 TPI 5speed
1LE/G92/WS6
K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(47psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires,Bosch O2sensor, SLP headers & catback,3:73s w/Auburn posi,160* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.
Street legal with stock throttle body, runners,intake manifold,cam, and heads.