dennisbernal91z

iTrader: (2)

Hi I am building a 500 HP camaro with trickflow heads and a crazy cam, all forged internals and such...matted to a 6 speed.

My first question is, can any motor be tranfered over to EFI? Or would I have to change cams?? There are sure to be many more questions, but this is just to get my feet wet. Thanks guys.

Orr89RocZ

iTrader: (20)

i'm sure you can use most any cam for EFI... usually you want a cam with wider LSA... but any cam can be used as long as you tune it right.


whats your setup that you have in mind? i'm wanting to make a 450-500hp 383 with trick flow heads as well. what cam do you have in mind?

dennisbernal91z

iTrader: (2)

it is super late and I have to get up in a few hours, so i don't wanna write a detailed description now... there is a pic of all the exact cam specks, on my site, please check it out.

The motor was made for a carb, I am just getting some $ soon and am thinking about it.

sofakingdom

iTrader: (1)

Judging by the difficulty you've had getting this thing going so far, I think the wisest thing you can do right now, is to put your extra new money in the bank and leave it alone. Then finish what you've got since it's essentially paid for. Get it working; shake it down, fix the leaks; let it break in; get used to it; get all the other supporting systems like the starting and cooling systems all ironed out, etc. etc. etc. And then AND ONLY THEN, start thinking about HUGE INVASIVE mods to it. Let your other money draw interest in the meantime. Don't let it burn a hole in your pocket. It can sit quietly in the bank, they're not going to up and spend it out from under you.

If you think you're having trouble getting it started up now, then you are not prepared to deal with some kind of a no spark or no fuel situation because something about a computer is unhappy, and you can't just look at it with nothing but your eyeballs and see what's wrong with it like you can with what you've got now.

What's this "super large cam"? I thought you had a 306 grind or some little street thing like that?

Orr89RocZ

iTrader: (20)

his cam specs...

its a fairly big cam.. 246/254 with .558 lift...

dennisbernal91z

iTrader: (2)

I know I need to get other thigs worked out. But I an just tossing this idea around. Since I am going to have the $ I just wanna know if it is even possible...... I am not going to swap anytime soon.


My plan is that I am goin to take the whole damn car appart again, and just leave the motor/tranny and rear in, and most of the syspention, and go piece by piece putting it all back, now that I know what I am doing... Also I am going to buy a nice new painless harness that mounts in the trunk and wire the car up 100% right this time. Then when I get the motor and it causes me problems, I will have it towed to a place that can spend time tuning the carb and jetting i and such. I ust have no experience with carbs and I am trying to learn on a "fairly big" cam. So that the plan.....

I will be going on co-op over the second half of the summer, So i plan on buying another 91-92 Z28 as a DD sometime neer then, and totally finish this crazy car with the $, by that I mean getting C5 brakes, the cervini hood I have allways wanted and of course the wiring to be all correct.... Once the carb is goin good, I wil decide if I wanna drop in the EFI.

All I wanted to know is if the cam in this motor is able to run on EFI...... Just so I know if it is even an option.

And one final thing, This cam may not be SUPER huge, but I say it is big coming from a totally stock 305.... oh and this is pure street car.


anyways, thanks for all the help guys..... After finalls week, next week, I get a week off. I wil be able to use a lot more of your advice then and report new questions I have, thanks again.

sofakingdom

iTrader: (1)

A cam should always be chosen to match its application. Meaning, when/if you change induction, you'll want to change the cam to match it. That pretty much goes without saying. I'd guess though, given that time frame and all, that whenever you get around to doing the EFI swapover, a new cam is going to be relatively low on the list of total expenditures you'll face. Not much to get worried about at this point.

More than likely, being as how that's a purpose-built cam for what your setup now is, it will be less than optimum for some other purpose (ANY other purpose); you'll want something more specific to whatever FI setup you end up with.

Fastbird

iTrader: (5)

That cam is not too big for EFI. It really depends on what type of intake you plan on using.

With that duration cam, you are looking at upper RPM power so your only good choice becomes a miniram. Another thing is low gears. 3.73 being the smallest ratio you would want to run. 4.11's would work better.

I run a solid roller 248/248 @ 0.050 with 585/585 lift ground on a 110. It idles fine with the DFI and miniram. Even has enough vacuum for power brakes. It all comes down to the tune. And yes it is a street driven car that sees the track a couple times a year....not a trailer queen.

But to build an EFI system that is going to handle that kind of power, regardless of what cam, you are looking at some serious coin. Just be prepared and think it through about 10 times before you buy the first piece.

anesthes

iTrader: (12)

What do you idle at for vac?

I've found that although speed density is the bomb as far as tuning goes, if you're idling < 10hg, and WOT is anywhere from 5-0hg, you dont have much tunability left. And with a 2-bar map it's even worse..

I think my next project is gonna be an lt4 powered vette. Been kinda toying with the idea of a 500hp n/a motor.

-- Joe

Orr89RocZ

iTrader: (20)

i'd like to think that cam is MORE than plenty for 500crank hp... that one magazine test got 505 outta a miniram with the comp cam XE288HR.. which is a 236/242 with less lift.

anesthes

iTrader: (12)

Whats the rest of the motor specs?

-- Joe

dennisbernal91z

iTrader: (2)

Just wanted to say that my car does have a 12bolt with 4.11s... some said it would be better if it did. and it does.

Looks like I will need a cam swap, so I will most likely sit tight and use the carb for a year or two before I do the swap. Thx guys

Fastbird

iTrader: (5)

My motor makes approx 550 at the craank depending on what % loss you give the drivetrain.

As for idle vacuum I am at 12 in. It idles around 900-1000 rpms.

This is probably the jagged edge as far as what you can get away with for an EFI system as far as tuning goes.

I have a 406 motor which makes the cam behave itself a little better than if it was in a 350 or 383.

dennisbernal91z

iTrader: (2)

sounds like a nice set up. ^^^^^. I will be a little lower than that at the fly I think. It is only supposed to get to 500 peak HP, and TQ is supposed to be around 475.

There is actualy a little graph in summit, the place my engine builder bought the set up from, so it should be sorta close to it.

Now if I could pass my classes and get to my break, I can finally get some work done

anesthes

iTrader: (12)

Whats your combo? n/a ??

-- Joe

Fastbird

iTrader: (5)

Here is a link to the car starting and idling in my garage.

http://drugg.net/steve's91idle.mpg


The combo is 406 small block, solid roller 248/248 with 585/585 lift. Miniram, AFR 210 heads, 11.8:1 compression (yes it runs on 93 octane), 36lb Ford injectors, DFI-6 controlling it all. Hooker Super Comps to a 4" Mufflex system. 700r4 with 4000 stall vigilante convertor, strange 12-bolt with 4.11 gears. I think that about sums it up. Car weighs about 3750 with me in it. Full steel, has A/C, cruise control, cool stereo system with 2 12's in the trunk. Just an all out cruise car.

700r4 is about to give up the ghost though...At wide open throttle it is slipping and searching between gears. Time for a Turbo 400

dennisbernal91z

iTrader: (2)

Thats awsome. Very nice work. I might try and head in that direction. I was first set on just having the basics, but after you said u have all that stuff in yours, it is making me think twice...... Oh well.... Looks like this summer is gonna be a little more expensive after all, hehe. Any more pics, or clips would be great.

Lo-tec

I have to agree with sofakingdom.

If you can't get it to start with a carb, what do you think the outcome of an efi swap will be?

Let me guess the post:

I just spent $3500 on this EFI setup and my engine won't run-help

dennisbernal91z

iTrader: (2)

I allready said that I am not wanting the swap cuz the motor won't run. I just wanted to know if it was an option. Apparently it is, but it would run even better if I did a cam swap. My question was asked. As for the car not running now, it is cuz I have not worked on it since I tried last time... I have no time right now.

I will be running a carb for a year or two before I take the plung to EFI, pretty much exactly what I said last post.

Thanks for all your help, later

-Dennis

anesthes

iTrader: (12)

Sounds pretty wild..

Im in the process of trying to figure out if my motor will fit under the hood of a C4.. I think Jesse (ski_dwn_it) ran a singleplane shortyly on his c4, so I guess I should ask him.. I'd hate to have to go to a miniram.

-- Joe

Lo-tec

The guy I sold my old pro-ram intake to was putting it on a C4, and I think he was either cutting the hood or changing it to get it to fit. I'll try to get ahold of him and see.

anesthes

iTrader: (12)

I dont remember if it was you, or someone else that told me you can mill nearly 2" off the top of the intake before you run into problems. ??

-- Joe