What is the highest flowing TB for our systems? Is it the holley or the 454 TB? What are the bore sizes on both (2")? Also I've heard that our injectors off of the 305 can be plenty for a mild 350. You just have to boast the fuel pressure. What I'm really tring to figure out is what the best TB for the 330hp vortec headed 350 crate engine. Turbo city looks good but it just doesn't look big enough. How much does it cost to get the equipment to burn your own chips? About how much does it cost to get a chip burned? Last question, can somebody give me the demensions to the carb to TBI adaptor plate. I'm making one and I don't feel like measuring it all out.

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, Jon (91 RS too many mods to list)

 

my advice, find either a gm TBI unit from a 454 or a holley TBI unit but use your stock injector pod and use a single plane manifold

look for this used, the deals are out there, i got my holley 2" 670 tbi for 60 dollars shipped to my house

Im programming with about 130 dollars worth of equipment

to make the adapter plate youll need the manifold, and the throttle body to best do it, the edges have to be canted inward for most manifolds to work

 

2" is 2", whether its holley or turbo city or gm. Dont buy names. God i wish i had mine in production by now. (looks like summer to much $$$$ to build)

 

Where can I get the equipment to burn chips? Why do you say get a single plane manifold Pablo? I was thinking a dual plane since I'll be driving it on the street a lot. The car is going to have to handle a 540 mile drive :-) I'm thinking the air gap manifold might be a good deal. So does everybody think the 305 injectors will work fine?

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, Jon (91 RS too many mods to list)

 

305 injectors can't handle 330 hp. Realistically, you'd need at least 65pph. Also, you're pretty limited on single plane manifolds for vortec heads.

[This message has been edited by JoB (edited December 20, 2000).]

 

I've heard so many mixed things about TBI injectors and what they can handle. I've heard they've been tested to handle crazy pressure. Then others say just get 350 injectors. I think I'm going to try the 305's out and just watch the actual fuel spray. If it looks like it's not going to work then I'll just swap on my dad's 350 injectors for a while and see if they're any better. They're the least of my worries.

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, Jon (91 RS too many mods to list)

 

try your injectors first. you cant expect to have everything done before you start. somethings are going to have to be adjusted or changed after you do the swap.

 

you cant just swap injectors hoping to fix a problem, theres alot to adjusting the fueling on these motors

and yes many of the TBI injectors can handle extreme amounts of fuel pressure, my 305 injectors have been run at 50 psi without problems before, of course you need the proper fuel pump

you can calculate how much hp those injectors at 50 psi would support on an engine with a .5 bsfc which is typical although i seem to see more engines with a lower BSFC than that

each would flow about 90 lbs/hr, and x2 those would feed around 330 horsepower (the big horses, not the ponies in parts claims)

 

To make 330HP you'll have to use the early BBC injectors, and 2" butterflies will support that.

 

50psi seems to be on the high side don't you think. So what are the cheapest injectors that I can run with the stock fuel pump and still feed the 330hp?
Where can I get the equipment to burn my own chips?
Lastly, where is the best source to find 2" TB?

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, Jon (91 RS too many mods to list)

 

im lookin for investors to have mine built. Otherwise, first try the classifieds here, then ebay, then if you must resort to buying from holley. but their tbi is mostly the same as gms. i think they just bought the castings or somethin, or contract with rochester to have vmore built. i dont know.

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Open Element Tech Article

ENGINE SPECS:
Stock Rating: 170bhp & 255ft-lbs
305 TBI,Open Element,K&N 14x3,Hypertech Stage I,454 GM TBI
Now Rating: A Little More

STEREO SPECS:
JVC Kalmeleon kdlx3,Infinity Kappa 2way 6x9's,PPI 4x6 Coaxials,PPI PC2400 AMP @ 2ohm
DEI Studio 12" 4ohm DVC,Custom Box:Exactly 1 Cubic Foot

 

like grumpy said, the early BBC injectors will get the job done, I believe they flow 90lbs/hr at stock pressure


and relative to stock tbi fuel pressure 50 psi sounds high, but thats what ive run on mine, injectors still worked fine, im running like 19 or 20 now


as for the chip burning equipment, read the article in the tech section by Tim siford (aka Traxion)

 

Sounds good, thanks guys. Hopefully I can keep this TBI system with the 330hp engine. I'm really more worried about if failing because of knock since it doesn't have EGR.

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, Jon (91 RS too many mods to list)

 

To get near 330, your going to have to be doing your own chips, and once you get there then you can see what to do with the EGR etc..