TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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Here's some quick answers to your questions Josh. These are by no means the final answer, but more like guidlines.
For a rear end you will start breaking stuff either immediatly or about when you start breaking into the 13's in the quarter. Which with a good setup will take about 300 hp and good traction. The stock rearend is weak no questions about it, they were designed for Vega's with 4 bangers and GM decided to put them in everything. You can build up your rearend or go aftermarket.
The tranny is another hit or miss area. Some people break them when there are stock and others have ran in the 10's with them. If you get a good rebuild by some one who knows what they are doing and add a transgo shift kit it should be good for 12's before the converter and some internal parts start ripping apart. Stay away from b&m shift kits, they killed 2 of my trannies before I figured out what was causing it. Also you can swap in a th350 or th400 with some available swap kits that give your torque arm a place to connect to. They can be built up for more power cheaper but you give up overdrive and the 700 has a lower first gear.
As for a motor, 350's are cheap, like 100-200 gets you a rebuildable core. 400's are expensive and impossible to find. Count on 500-1000 for a rebuildable core. It cost only about 150-200 more to stroke your 350 to a 383 so thats why so many people want to do it. A big block will swap, but it's only for those who have the knowledge and the will power to make it work. A big block will bolt right in. Same motor mounts, it is just 2" longer and 2" higher. Price wise they are expensive too. figure 500-1500 for a rebuildable core. Also all small blocks are the same size demensionly. So get out your tape measure and start measureing.
Finaly you don't sound too familiar with camaro's or chevy's in general. Are you sure you need to be just throwing mad dollars trying to get all this motor in your car just yet? I'm not trying to offend but you might just want to start small. Try installing headers and a cat back exhaust, maybe a set of gears and get your hands greasy on your car. You'll learn alot about it just working on it.
Hope this helps and everybody else just fill in the blanks where they feel fit.
My dream sbc would probably be a 434. There are a lot of different bore/stroke combos you can go with and there is also a lot of money you can spend. Just go with what you can afford and what will meet your goals.
Originally posted by steve8586iroc Don't forget the Holley 900cfm tbi and Comander 950 ecu
Steve
Do they still have that 900 CFM holley tbi readily available? I just want the tbi but last I heard it was a rather pricey special order item. Id like to run a perky 400 sb and be able to feed it adiquatly both air and fuel wise.
I've read that thread before too. I think there is still debate as to whether or not 4 injectors will run off of the stock ECM. I think it can work that all 4 will fire but from a DIY-Promer perspective I think they're saying it doesn't work like it is supposed to, just a thought.
I'm pretty sure a guy on here ran 4 injectors back a while ago too, "Dan W" I think.
It can be done but theres the problem that there really isnt enough current to run them at high speeds. Running them in parallel really isnt an option either since neither the transisters, ecm, or wiring is set up for that kind of current draw. An external injector driver can cure this but there is also the problem of what happens with four 65 or 85 pph injectors trying to meter a tiny bit of fuel at idle. I was thinking of using one the ecms outputs to activate the injector driver when the second set of throttle blades opens up, say at 50 WOT or whatever it will end up being. That way Ill only have two injectors to worry about at low loads and at high loads ill have at least 250 pph of fuel to work with. The outputs arnt that bad, both the smog pump outputs can be easily comandeered and made to turn on at will. Dont know how the code to handle the fueling at the changeover will be, though or how itll react while all four are being brought online. Looks like the biggest problem might be getting a 4 bbl TBI. New theyre listed as discontinued and not too many people seem to be parting with used ones, and you can bet that theyll be pricey. The only ones that I see floating around are the older ones with the crap injectors. Good for a multipoint conversion but not much use for a tbi system.
"In series" Is how Howell has the 700cfm Holley 4bbl TBI wired to work with the motor that i'm building. It will be run with the 8746 ECM. Everyone sayes that it won't work but Howell asures me it will and I've talked to someone on this board that they helped with the wiring of another 4bbl TBI, he said his ran fine too. I don't know how it'll turn out, if it don't work I was thinking about going with Holley's multi-point setup. I only had to give $250 for the 4bbl TBI.
__________________ '91 Camaro RS 305 TBI TH700R4 NOW TOTALED OUT
Moroso Air Filter, 4-Wire Heated O2 sensor, MSD GM Blaster Coil, Holley Blue Fuel Pump with Moroso Upgraded Spring, LT1 cam, BBK Underdrive Pulleys, Energy Suspension Tranny Mount, B&M Downshift Kit, B&M Transpak, B&M Drain Plug Kit, B&M Trick Shift fluid, Moroso 20lb radiator cap, Milodon 160* thermostat, Edelbrock Victor Water Pump,
Earl's Hyperfirm Stainless Brake lines,
Summit 1900 Stall Converter,
B&M Flexplate, AC Rapid Fire plugs,
Flowmaster Cat-Back Exhaust, Jet Fan Switch, 40-Below Water Weter,
Ultimate TBI mods, Tuning by TBIChips.com, Spoon Performance sway bar set, Removed EGR,
Removed Cat. Conv., Removed Smog Pump
Probably a better solution would be to run a secondary injector driver so you dont have to worry about the injectors getting flakey. Be a good setup on a healthy big block
Originally posted by joshwilson3 ... I'm still trying to figure out what block I need to start with on my engine build. So, you say the more cube the better. So, what is the largest cube that I can get that will fit in my 1989 firebird?
..... or is there something I'm missing like cost, getting it to work or something?
You're asking a ton of very basic questions (basic to many here -- but perhaps not to you).... and the answers could fill books. So it might be a whole lot better for you to realistically tell us how much money you really plan to spend, and we can steer you to the appropriate engine build.
I will also suggest you get a copy of David Vizard's book on small block Chevy engine building.
Originally posted by kdrolt You're asking a ton of very basic questions (basic to many here -- but perhaps not to you).... and the answers could fill books. So it might be a whole lot better for you to realistically tell us how much money you really plan to spend, and we can steer you to the appropriate engine build.
I will also suggest you get a copy of David Vizard's book on small block Chevy engine building.
I don't know how far I'm willing to go with this engine build. I'm gonna be piecing it along. The main thing I'm trying to figure out is what size engine: 350, 383, 400,427. That's the thing I'm trying to figure out. Is bigger bore always better? I think that I've even saw posted on here that you could get a SBC 454. Anyone know anything about that? But I'm guessing that I should get the biggest bored engine like the 400 and stroking it. But I'm interested in this SBC 454 I've heard about on here. But I'll probably be sticking to a GEN 1 block. I was thinking of going GEN 2 LT1 or LT4, but I'm not sure. First thing first, is what cc block to get.
Yeah, I do plan on getting some books. I'll have to get that book that you mentioned. Do you know of any other real good books I should get? I'm also thinking of getting a C4 Corvette to work and mod on instead of modding my 1989 firebird. Cause I've always wanted a Corvette. Can a BBC fit into a C4 Corvette?
Basically, yes, bigger is better, but there are a few exceptions. To get 454 cubic inches out of a small block you must have an aftermarket block. Everything depends on how much $ you are willing to fork out.
Originally posted by 25THRSS Basically, yes, bigger is better, but there are a few exceptions. To get 454 cubic inches out of a small block you must have an aftermarket block. Everything depends on how much $ you are willing to fork out.
Do you have a product name or part number for this item? Or maybe a link? I'm guessing this 454 small block is a generation 1?
Originally posted by joshwilson3 Do you have a product name or part number for this item? Or maybe a link? I'm guessing this 454 small block is a generation 1?
Ohh...thats pretty... I have a 94 GMC Suburban with the 7.4L BBC 454 in it. That thing is a B-E-A-S-T. When that thing was new it could have pulled a 17 in the 1/4, no exageration! Gah, that is most definetly my favorite engine...
Bruce (90RS305)
__________________ "The INFAMOUS Bruce" Gun-Metal Grey 1990 Camaro RS L03' 305 TBI 5 speed One Of Only 2,787 Produced!! --1/4mile = 15.3 @ 87.00mph--
How do they get that 434? Is it a 400 SBC stroked and bored? And how does that compare to a 454? Is there enough room for a rebuild later on down the road? That is what I want in an engine build, the ability to rebuild it later on.
Hey Dewey, I like that engine also, BUT I don't think I would want to run race gas all the time. 14/1cr is pretty tuff to run on the street. Makes a killer race engine though. The Bill Mitchell 427 or 454 will run on premo pump gas, so I would have to go with one of these for a street car. Now the real question is, can I make 600hp with the BM454 with a 454tb and 90# injectors at a 150psi?
Steve
Last edited by steve8586iroc; 01-23-2004 at 02:21 AM.
150 PSI ? i dont think you can run GM injectors that high. GM i think in older TB applications ran 12 lbs at 80% duty. maybe 20 lbs MAX and that takes a LT pump or aftermarket. my 85 vette pump we measured at 21 lbs B4 the injector unregulated? sound right guys? 4 90 lb inj is the way to go. SY1 with dual 454 TBs bored out to whatever and tied into modified ECU to run 4 of those injs...whatt manifold did original Z28 (302) use? check GM performance parts on that.
no no a party on crossfire is building a 4 x one barrell engine right now with a custom plate on SY1 manifold. due to fact he needs more CFMS and LBS. anything possible if you have the knowledge and $$$$$