Alright, well I know the most about the fast burns and the LT4 hot cam so I have basically decided to go with that for my first engine build. What I want to know is how much power could I expect from the stock TBI, with ultimate tbi mods, different injectors, AFPR, and a single plane with an adapter to fit the heads? What fuel pressure should I run? I know I would need a whole lot of tuning, new chip and everything, and I plan on just getting tbichips.com to get me that for now, until I learn how to burn my own. What injectors would anyone recommend? And what fuel pressure? How much less power would i have if I just went with the cast iron vortecs? This is going to be a streetable, and fast I hope, daily driven car; so what power could I see with just this? I do plan on chaging cam a little later on. but going small for now since it's my first and I want to learn how to tune and build more than anything.

first, if this is going on a 350, good combo, fast-burns + lt4hot cam can make more than 400HP.

bad news, stock TBI ported to the MAX is not going to cut it. 670cfm, may do it, assuming you can get enough gas in there. you will need a new fuel pump, and the TBI unit with the largest injectors you can get from holley. you will likely have to raise the fuel pressure to fuel that beast up high.

no mail order chip will work for this combo, learn to tune before you do the swap, then tune it yourself. that is a very extreme change, and well, tbichips.com's chips for 'custom' combos have been known to be not much more than slightly modified 350 TBI Caprice chips, don't waist your money, do it right, do it yourself.

if you are talking about the combo on the current 305, forget it, way too much cam.

Oh heck no....I would never waste my money tuning on a 305 unless it was a last resort and I was tired of getting walked on my hondas. I am aware that the stock TBI is gonna kill everything on the top end and grossly limit the bottom end as well. I plan on saving up later for a MPFI induction system, probably the mini ram III, and the price is the reason I am not getting it right away. Plus a single plane for vortecs isn't all that much, and I want to get a 350 in the car and running so I can start tinkering and learning to tune. What fuel pump would anyone recommend and what about fuel pressure? I know my stock pump won't cut it but should I get an in-tank pump or just get an inline one? Also, what's the name of the program you can buy that allows you to burn your own chips....I wanna start learning asap and I think that'd be a nice Christmas present.

i would go with this one...

http://www.racetronix.com/product/RX..._Pump_Kit.html

and the regulate the pressure down to where you end up needing it. you WILL NEED at the least new injectos. period.

cool, that's freaken cheap for a pump. The stock one is just a little more than that....OH well. I plan on doing 85# injectors to feed it. Hopefully that'll work for the time.

i can verify that pump will feed a 7500rpm 500hp 383 motor at 50PSI with 30# injectors. it should be plenty for what you are going for.

are 85# the largest out there now? those are equivelent to 22# on a TPI car.

I think the 85# were on the 454 TBI engines. If I am not mistaken, I think there are up to 90# out there now. I'd have to check on that though. But like I said, I don't want to spend too much on induction cuz I am hopefully going to save for a miniram III or maybe super ram with vortec baseplate. Dunno yet on that either. So many choices.....so little money....

another option that isn't brought up very often, and i wish it was.

since you are going with the fastburns

is this intake option.

GM Part #'s (you need 1 of each)

12489371 -- Ram Jet Manifold
17096144 -- Ram Jet TB
12553918 -- Ram Jet Fuel Rails
17123897 -- Ram Jet FPR (this may or may not be needed.)

alont with that stuff, you can use a stock TPI computer and injectors i believe. if the injectors don't fit the fuel rail. the part number for the injectors is 17124248 once agian, not sure if those are compatable with the TPI computer. price that out, it is much cheaper than a MiniRam III

Yeah, that's true. I completely forgot about the ramject injection system. It seems ok, but I hate the way it looks, all narrow and crap. I wish the stealth ram has a vortec-type baseplate or maybe a LT1. That's why I aws gonna do mini ram, I like teh way it looks a LOT more than the ram jet. but if it is cheaper, I guess I could look into it.

the ramjet does have longer runners than the miniram , one of my really good friends has the miniram and on a 383, it breathes clean ot 7500rpm no problems there. if you can afford it, it is a great intake.

i have 90 lbs GM injectors at 9.5 lbs FP and feeds the motor to 5800 rpms with a rich A/F at 12/1. single plane. 2.00 TB's. max HP is at 5100 rpms however due i feel to to small a cam..what are specs on LT4 hot cam?

112 LSA, 218*/228* duration @.050" .525"/.525" lift w/1.6 rockers, .492"/.492" lift with 1.5 rockers

that is quite a large cam. not sure if i would want to go that big. i have 206/214 at .05 and will go to 218/218 in spring.

Nah, the cam is relatively small actually. It just has some nice lift characteristics. I suppose the ram jet with the longer runners would allow for more low end torque, plus some higher end power over TBI. then again, 5100 rpm isn't that bad of a hp peak, it's relatively low and doesn't take forever to reach. Dewey, what are the specs on that 383 you are speaking of? Just curiosity.

what exactly are your cam specs? Just trying to get some more ideas before I start doing this so I can have it running as soon as possible.

the specs on it are.

10.0:1 compresion. AFR 190 heads, mini-ram, forged everything, UltraDyne 230/238 .565 .565 114 the cam is set up for nitrous, after we get tuning done, he is going to run a 250 or 300 shot. and then in the future put in a pro-charger. it is a stout little mouse.

it is a MAF car, and still needs ALOT of tuning. before this, he had his stock l98 longblock, with the mini-ram and hot cam, but spun a rod when his oil pump pickup fell off the hot cam for the specs is suprisingly mild, and is pretty computer friendly. i think it is a great cam, and the right one with the fastburns , you just need to get it the air and fuel it needs.

I have the same question, what would be a good tbi for a zz430 motor? I will run it with a 730 ecm

well if the miniram III uses a TPI throttle body, then it would be cheaper.

all the stuff above you listed for the ramjet is like 900 and some dollars, the miniram is only 870 something. but thats just for a manifold.

LT4 intake can be made to work from what i hear, only have to work on the bolt hole locations.

As a question though. how would a properly tuned miniram III or a LT4 intake compare to a carb and manifold?(i.e. edelbrock rpm air gap, and 600 cfm carb)?

gas mileage is killing me......if the horsepower issue is a toss up, im gonna buy a LT4 manifold, and make it work.

i just have other stuff to do to my car first. (i.e. a transmission that isn't about to break, a hood without a giant hole in it, and a paint job.

ok,

1) the miniram is NOT that cheap. look into it more. you need more than just the bare manifold. especialy if you are swaping from TBI.

2) gas milage sort of goes with HP. you can only get an engine so efficent. the more power you make, the more gas you use, it goes hand in hand.

3) HP wise, in some ways carbs are better. but you sacrifice gas milage and drivability. EFI is the way to go. as to which is the best choice, there are alot of things to consider. the cam you choose, the heads, your driving style, the tranny, the rear end gears, ect, all go into finding the right combo.

if you are trying to low buck a build up, maybe start looking into some cheaper heads or saving money. imho the lt4 conversion is a hack job. i know that alot of people will argue and talk about how it is the greatest thing since sliced bread. but drilling a dizzy hole, and doing this and doing that. IMHO is not worth it. also another thing to toss into this, GM desinged the ramjet manifold specificly for the fastburn heads. they are a match made in heaven so to speak. if it was my money, that is the route that i would be taking. whatever you descide, you are going to have a hot little mouse on your hands, and i am sure you will be happy. all the options here are very valid, and proven intakes.

Dewey is more than right in this case. The miniram III is close to $2000 after you get you get everything for it. Driving style and purpose of the vehicle are the biggest factors in choosing the intake for a combo like this. I am personally wanting to run EFI cuz I like the tunability of FI and it is my daily driver so I want something that will get good fuel economy, throw codes at me if something is wrong, and have room to expand upon.

Dewey, that's a sick little motor ya'll are tuning on. Just make sure you get it all right before you throw that shot on.....wouldn't want anything to blow up right when you hit the funny gas! I checked on the Ram Jet, and Pace sells a "complete system'' for around $1300. I know I can find better. Do you know if stock TPI or LT1 fuel rails will work with the Ram jet? That'd make life a whole lot easier. And it is a MAP system so a harness for running it will be cheaper as well....wahoo. Thanks for the help!

yes, the pace kit is nice, bascily i don't beleive stock fuel rails will fit, i basicly dummied the pace kit down, to the bare min. of parts that you would need, assuming you had a TPI harness, and such. i am also not sure if the injectors work or not, might be worth calling pace about, see what all is needed to really do the swap.

Yeah I got the jest of it. Not too bad actually since it is really conducive to more torque than the miniram. And I think it is more cost effective than going super ram as well. I think that is what i may go with as soon as I get the motor build and just not worry about the TBI at all. Patience is a virtue so if I save long enough I'll get the money for everything at once......