lb9 GTA

I've been dealing with an intermittant code 34 for a while now and, after reading the article that formulax4 posted I read that a worn throttle body could be the problem. I went out and tested the TB and sure enough it's worn out. So I'm wondering what the best TB would be for my car. It's completly stock aside from a cat back and CAI for now. I know I won't see any benifits from going with a 52mm now but I do plan on up grading in a couple of years where it may make a difference. Anyway, suggestions and insite would be appriciated.

james.gould150

i am subscribing not stealing your thread id like to know too i want to upgrade my tb as well but and reluctant to but the 52mm one but idk if ill even see performance

lb9 GTA

I know I won't with the way my car is now. My cam is too small and my heads and intake are too restrictive to see any improvement in performance.

vette_1989

Everything that I have read is that the stock 48mm TB will support up to 500HP. So don't think that big is better.

myzblubyu

BBk or Holley 52mm... If you need another TB let me know I have 3 stock ones laying around...

lb9 GTA

I've desided to get my stocker rebuilt locally

Chevy86 IROC-Z

iTrader: (17)

If you plan on getting the larger TB (58mm), you wont see any difference. You need to port the plenum, get larger runners (edelbrock,Arizona Speed and Marine, Accel), and a Edelbrock intake manifold. New Aluminum heads would also benefit this combo. If you get just the TB and use the stock intake, the incoming air will be too restricted and itll defeat the purpose of a TB upgrade. I have my stock TB on right now. I got the Edelbrock Hi-Flow base aswell as a few more aftermarket parts just laying around in my computer room. No sense installing them just yet because i dont have all the parts necessary to make my baby tear up the rear tires.

james.gould150

is it worth it to get just the runners and the tb? or is it the same deal and i should wait until i can afford the intake to?

Chevy86 IROC-Z

iTrader: (17)

Its best to wait and buy it one at a time especially if your tight on a budget. but to really FEEL a big difference, here is what I suggest. These changes will give you around 5-30 hp more depending on which items you choose. Here we go.
1. roller rockers, roller lifters (roller lifters will only work if you have a roller camshaft)
2. ported plenum
3. Air box filter bottoms removed
4. after market runners, aftermarket intake manifold
5. aftermarket aluminum heads ( better perfomance if heads are port and polished)
6. aftermarket headers and y-pipe
7. 52 mm TB (Holley) with TB Airfoil
8. MAF Sensor screens removed

these mods will increase power to the rear wheels and there is no need to reprogramm the MemCal (PROM). Also if you choose to buy a roller camshaft, make sure the camshaft is "Computer Controlled". If it aint "Computer Controlled," YOU WILL lose vacuum and you WILL have serious issues. This suggestion of mods is what I have done and will do to my 86 TPI IROC-Z. Like I said, buy the parts (runners and intake manifold) one at a time so that you can remove all the parts at one time instead of once every 3 months. You can choose to put on the TB though since it is easily accesable. Good Luck man