Hey Everyone.

Im debating on whether its worth it to put an air foil into my car.

The set up is:
LT1 Cam (.447 lift)
1.6 Roller Rockers
Edelbrock TES Headers
3" Catback
3.42 rear


Would it make any more power? My engine is a 305 with the above modifcations.
I understand it wont make much street driving difference

Would it knock any 1/4 time off? or 1/8 mile time?

Any extra HP from it?

Thanks,

sheldon

 

the little $20 item that goes in front of the throddle body? sure buy it, it can straighten air so theres no turbulence in front of the TB. as far as performance is concerned, they say you can gain 5hp but you have to find out for yourself. there are websites saying they are awesome and usefull and other sites that say they are useless.

EDIT: but for 20 buks who can go wrong?

 

I bought one just for the looks, as for flow straightening, the screens in the MAF do that so the small sample of air the hot wire anemometer measures is representative of total air flow, turbulence would cause errors in the MAF signal.

 

That is true but when the air goes into the throttle body it hits the flat spot in the middle of the blades and cause's turbulance entering the plenum.Dont expect huge gains from it but like everything else we do every little bit counts

 

i sure noticed a differance in throttle response. $20 and 20 minutes of work is sure worth it my friend!!

 

Save yourself buying something twice, and get a 52mm throttle body with an airfoil already built in.

 

I installed one a few weeks ago along with an Accel Ignition module and I descreened the maf sensor. I couldn't tell a difference in performance. But I surely don't think it hurt anything!

 

Yes I have one, didnt feel a difference, but like everyone else said.....it couldnt hurt.

 

port out your intake then buy it, you feel a difference

 

Here are some flows numbers for you-all, these numbers have been posted here before.:
A stock 48mm TB flows 783 CFM at 28" of something, the standard test conditions on flow benches. The same TB with the airfoil will flow 822 CFM. A 52mm TB with a built in airfoil flows 899 CFM. The air foil may not drop your 1/4 mile ET, but it cant hurt.
You would probably get more of a gain from an AFPR.

 

Thats pretty useful info there Doc! It makes me feel a little bit better about spending $40 on my air foil.

 

The center between the bores is what produces the turbulence and the airfoil does reduce it for an increase of about 4HP, but like I said I just bought it to make the center piece look better, although it can't be seen, I at least know that it's functional.

 

With the mods listed I see no gain.

Think about it this way, where is the weakest link in terms of flow? Air flows through many different parts of the intake system as it makes its way to the heads. Air filter(s), tubing, possibly a MAF, a throttlebody, the plennum, the runners, the base intake manifold, then finally the heads. Each of these different parts flows a different ammount of CFM, and you'll always be limited by the part that flows the least. You could have high flowing throttlebody, high flowing plennum, and high flowing runners, but if its all installed on a stock base intake manifold, there will not be a huge gain. So if the rest of the Intake is still stock, an air-foil is not going to help anything. To really see a benifit of more airflow all the parts of the Intake system need to be upgraded/modified to flow more.

 

CrazyHawaiian, Any tips on wether a stock TPI base is worth porting/polishing vs. getting an aftermarket one that flows better than factory? I understand that my air box will be my biggest restriction, but I have a plan for that. In the future I will be rebuilding the L98 with better heads and possibly a 383 stroker. I just ordered my 58mm TB and AZ. S&M runners and will be port matching them to my plenum. Should I match them to my stock intake or look at an aftermarket one when I do the 383? Thanks , Daniel U

 

The TB isn't the weakest point, especially in a 305, so it probably won't make a much of a difference, if at all. You can only jam so much air into the plenum on any engine until the runners and heads become the restriction. For the price you can't really go wrong, just don't be upset if you don't notice a difference.

 

Josh, I bought the 58mm TB for the future 383 stroker. I have a 5.7L(350). I'm not looking for any gains right now with my stock L98. I have also purchased bigger runners (AZ. S&M) as well. When I do the 383, I will get the proper head/cam combo for my goal(See my vB garage). My IROC has a restrictive air box/air filter housing. I plan on either fabbing up a new one, or seeing if it can be enlarged like JMiller's. He sliced his longways and added fiberglass to gain more inside air volume.

 

Actually, the air foil really helps you out at top end (higher rpms). So in theory, it couldn't really hurt, but you wouldn't be able to tell any difference below 3000rpm. Get a AFPR, and you should see a bit of a gain.

 

I noticed some crisper throttle response, but YMMV.