hey guys have not been on in awhile but im trying finish up my bolt on list & rain been keeping me held up. as ive said in the past post all in doing in straight bolt on and was seeing if it was worth it to switch my stock 48mm tb to 52mm. seen test say 15 hp gain & so on read alot say no but wouldn't it make more sense to get more air flow ? with the 52mm also are air foils worth it ? and when doing the tb bypass do you have to plug the ports up where you took the lines off are can they be left open ? and can i keep my stock maf would getting new one make more hp ? thanks guys and any tips on more bolt ons and best lt1 hp gains would help.

 

There is a website out there, ws6.com, that has a dyno test of the airfoil. The dyno chart shows an increase at very high rpm but nothing obvious at low and mid-range rpm. Also, as with all machinery, there is some error in any reading. I've read that dynos have an accuracy of about 97%. On a 300 horsepower engine, that's about 9 horsepower. Since this dyno run shows less than 9 horsepower, it's hard to say the gain is real...

In the real world, I doubt you would see any benefit from a TB airfoil...especially since it's a slight difference at high rpm. I skipped it and think you should, too.

As for the throttle body itself, the 48mm stock item can flow enough air to support about 500 flywheel horsepower. I believe it's the same throttle body used on the 502 HP/502 cu in big block crate engine GM sells. Bottom line, you won't hurt anything bolting on a 52mm throttle body but I don't think you'll see any benefit at this point in your modifications....

Obviously, it is your money to spend any way you want but I think you can do better than either of these add ons....

Good luck!

 

Plugging the open ports for the coolant hoses when doing the TB bypass is purely cosmetic. However, it does look more finished if you spend a buck on some 3/8" vacuum caps. A stock MAF is also your friend.

 

ok shoebox thxs for that ill cap them off doing it this week, just so much bad weather and if a air foil is not worth it and tb is not worth it and maf is not worth changing, what else can i do? ive got my ebay cai on it till my k&n gets here they dont fit right and takes time to make it fit but i could def feel a difference on it over stock, im looking for best hp without really going into the motor :/

 

https://www.camaroz28.com/forums/lt1...p-info-882765/

https://www.camaroz28.com/forums/lt1...0-60-a-882831/

 

those post had tb, air foil, maf in it with lil info on it why i ask.

 

You asked:

DelSoto gave you a detailed list of bolt ons, and I commented on it.

 

Things that are not worth the $$$ in an attempt to reach 300HP at the rear wheels:

-U/D pulleys
-throttle body air foil
-58mm throttle body
-1LE intake elbow
-MAF sensor enlargement or modifications
-Hypertech tuner (unless also used with a 160* t'stat)

Things that do make sense:
-CAI
-Headers
-3" mandrel bent catback
-52mm throttle body (marginal)
-1.6X full roller rockers
-throttle body coolant bypass
-160* t'stat
-a small cam upgrade
-a good mail order tune (cheaper than a Hypertech, and better)

so you say 52mm tb

 

if i do a cam do i need do lifters & rockers springs so on ? as ive said motor is stock

 

If you do a cam you will need new sprinngs. Since the car has 145k on it, you would do yourself a favor replacing the lifters. You will also need roller rockers to get the most out of any cam setup...

 

blah yea that will be a down the road thing are the stock cams pretty good ? ive got stock exhaust and new tune up she sounds pretty good for stock. im just trying get the most out of her without really getting into the motor.

 

Worth it and what can you do.... different and very subjective. If you just want the best bang for your buck period. Nothing will get you more HP per dollar than Nitrous. ~450 bucks for 50hp shot and get you to your goal and call it a day. If your engine can't handle a 50 shot yet, you shouldn't be doing boltons yet either.

 

shes at 146 miles knock on wood runs very strong to me ive never used nos had 150 shot was going to put on my 77 t/a with 383 stroker years back but never did.

 

I used the word "marginal" to indicate there may be some benefit, but whether any gain is worth the $250-350 is questionable. Logically, larger diameter reduces pressure loss, increasing the density of the air, hence increasing the mass of air in the cylinder. More pounds of air means you can add more pounds of fuel = more HP. But at 300-350 HP, the reduction of pressure loss is small. I've never actually seen a dyno test showing the actual size of the power increase.

 

true i was think of just getting my stocker port & polished to 52mm. guy im my town said he do it for 50 bucks ? beats 300 or 150-200 used.