90tbi305

I went to the turbo city site to puchase the tbi adapter. I saw two different ones, one is 635-606 That is offset, and the other one is 635-605 that is normal. I want to get the 2" just in case in the future i decide to get a 454 throttle body. Please help want to purchase as soon as possible.

red_johnny

Well I think I have a holley but I am not too sure if I do as I bought it off ebay. Anyway mine is an inch thick and off sets tward the front of the car more in doing so I have attached a pic to show you what I had to do...TEMP. to get this to work. I will have an adapter latter but for now...yeah. This may or may not be the case in your application as I have added the ZZ4 intake to my set up and 350 TPI heads (heads dont matter here) it just depends.


EDIT: The throttle cable WILL NOT adjust. It is a FIXED cable length with no adjustments from the pedal to the TBI. I looked it up in the repair manual....Sucks, dont it?

25THRSS

Centered is better

JPrevost

Centered is best for WOT power, front is the best compromise for a daily driver, and rear is the last resort.
If you've got a coat hanger you can bend and twist it together to be a useable throttle cable extender. You can do what I did, find a 1/2" thick piece of steel and drill 2 holes in it, bolt one up to the throttle cable and the other to the TBI, there's your extension.
I agree it's a pain that it isn't adjustable like the TV cable . Even the cruise control is adjustable!

25THRSS

The best design would be a thick centered adapter plate. Or you could just get the edelbrock tbi manifold.

90tbi305

Edelbrock is gay. its not 2". I would not have trouble with the tranny, i got a t5. jprevost i think your way is the best. So the centerd one is the way to go right?

25THRSS

Explain why the edelbrock tbi is "gay." It has the same plenum depth as the rpm manifold, the runners are the same as the performer carb intake, and it is a direct replacement. So if you can explain why the edelbrock tbi intake is "gay," I'de like to hear it. Besides the whole I want a single plane super high flow nascar intake manifold on my 200 hp tbi engine, there is no reason not to consider it. The only downside may be the slight increase in price for those on a budget, but then you have to factor in the price of the adaptor plate, fittings, etc in. To answer your question though, yes centered is the way to go. Preferably one that is thick so that the air flow is directed evenly no matter what the position of the butterflies are. The edelbrock tbi manifold has this feature as well. If you absolutely must have 2 inch bores, just have it bored out.

90tbi305

The edelbrock is gay, because of the intake boars. It isnt that easy to make it a 2. Thats way i say that it is gay. i like the single plain more than the dual plain. My buddy lost hp, with a dual plain. And i have heard that the single plain works awsome on awer car, Sorry about me trying to be in nascar because i just have a single plain manifold.

thedogs

ok ladies put your handbags down

each to his own. Theres all the pros and cons of each in the stickys and I think shifty bored his out to 2' with out a problem.

JPrevost

They all work, some work better when you can't tune, and other work better when you do tune!
Oh, and I wish they had the Victor or RPM air-gap when I was looking for vortec intake manifolds... I have the standard RPM.
Here's why I wouldn't buy the edelbrock intake; it's expensive and isn't already 2" bore. Of course there is the arguement that it does just bolt right up, including the power brake fitting! I just think with a little bit of work it's worth getting a carb intake for under $100 and an adaptor plate that puts it either in the front (holley) or middle (turbocity). The problem with the square bore carb intakes is that the 2" bore TBI needs to either be modified to let the butterfly's open OR you're stuck getting the 1" tall Holley adaptor that costs $50.
For any EFI I'd go with a single plane. It's easier to tune and makes more horsepower. For anything with a slightly higher than stall TC or manual trans there is no reason to WANT that extra 10hp below 2000rpm that the dual plane gives us.
Just remember this, whichever you choose/prefer, it's no longer the bottle neck.

25THRSS

Yes it is easy, very easy, a lot easier than hacking, I mean adapting a carb intake to work. And how did your buddy lose any hp going with a dual plane? What intake manifold did he have before?

miacamaro305

i have an edelbrock perfromer for 87 up cast iron heads.i use the holley tbi adapter but i dont think my adapter is towards the front due to that all my linkgage lines perfect with no modding.i yes i lost like 6 rwhp ,belive i dyno it just before and after the manifold swap