hey everyone.. i Have a 93 z28 with a t56 and im hoping to just get some general information if anyone can help me it would be greatly appreciated.

as you kno i have a speed density motor and the car rite now is pretty stock... im hopefully planing on doing some mods here soon.. but im getting mixed answers from people when i tell them what i want to do.

So here it goes, i want to get the lt4 hot cam kit along with doing some porting and get a set of headers eliminate the egr and put a stage 3 clutch ect.

Now hers my problem don't kno what the better way to go along with the tuning, I wanted to try and switch the car over to a mass air car and get ride of the speed density, but i cant get a strait answer from anyone with what that involves. I kno i will need to get a 94 or 95 computer and a wiring harness for a 6 speed and a mass air flow sensor of corse but what else am i going to haft to do to make it work? and is it worth it or is it easier to just take it up have a prom burned by a tuner for it? and if i switch it over what will i haft to do for a gauge cluster?

I kno this is alot for newbie but seemed like theirs a knowledgeable group of people that could give me some answers. Thanks in advance for any help.. Derek

 

is thier anyone that can help??

 

With the exception of one aftermarket system, they are speed density. Every HI po is speed density. So why do you want to change?

We know the following about 93's
speed density as you mentioned.
Batch fired injectors compared to sequential for all other years
Lower flow injectors. I think 22# compared to 24# for MAF types later.
Fuel system and intake manifold is different than later models.
ECM is prom type where the later versions are flash type.
Trouble codes can be gotten with a paper clip as compared to "reader" later on.

Here is one of many sources of information.
http://www.lt1howto.com/

Very few of us can give you hardware and wiring change advice because we don't have a shop manual for a 93. I personally have a 94 and a 96 manual. The 93 is a beast all unto itself. Aside from the obvious things you mentioned, unless someone has actually done the change, they are just guessing.

My advice to you is talk to someone like a pcmforless and ask their opinion since they actually tune these things and know the pit falls.

 

Depending on how many times you might want to change tunes, just having a custom chip burned would be the easiest thing to do. There is no big downside to having a non-MAF car.

 

Getting a 94/95 PCM with wiring harness would cause problems.

-the 94 or 95 harness is not going to match your body harness interfaces

-the 93 IAC motor connection is different than 94/95

-the 93 unvented Opti connection is different than 95.

-the 94/95 wants to control the T56. Your 93 T56 does not have the skip shift feature. No big deal, just requires a resistor across the harness wires for the skip shift solenoid.

-93 drives the tach off the coil, with an inline filter. 94/95 drives the tach off the PCM.

-I "BELIEVE" the VSS setup is different between the 93 and the 94/95

-the 94/95 PCM will run sequential fire injection. Your 93 fuel rails are designed for batch fire, and there "MAY" be issues with pressure irregularities.

Do some reading through this forum on alternatives to the LT4 HOT cam.

What benefit do you see in removing EGR? On your 93, the EGR and AIR systems are integrated. You would have to remove both. No performance gain in removing the systems.

I'd say to just keep the 93 speed-density, and have a chip burned. Yes, speed-density is a bit less forgiving when you make breathing modifications that change the volumetric efficiency, but make the changes and get a good chipped burned and you are good to go.

I have a 94 that left the factory with an MAF. But for the last 10 years the engine has been running speed-density, using an aftermarket engine management system (MoTeC). Never had a problem with the fact that it is speed-density, because is was tuned correctly. The MoTeC just makes it easier to change the tune than a stock PCM.

 

ok yea this all makes sense this is exact info i was looking for thank you all very much. i was only considering switching it because i have a buddy with a 95 and he has a programmer for them and i already have 24 lb injectors in it so it looks like with as much time and money this would take me its just better to leave it and buy a prom burner and learn how to use it.. and the reason i wanted to get ride of the egr and air was basically i dont live in an emissions state and thats less in the engine bay and less to go bad a kick me a code..

 

It would take some money and some know how from someone who has done it before. Like injuneer said it would create alot of problems. I think you went with the right choice. Also if you havent bought the cam and head package i would hold off until you look at a website that can give you more horsepower for three quarters of the cost or less. I have the edelbrock head and cam package and i love it but it cost me some money. The website is http://elliottsportworks.com/. I wish i would have went to this website would have saved me some money and headache because he explains to you any questions you have about your setup, such as trans upgrades rearends injectors anything you want to know. Hope it isnt too late.

 

no i haven bough anything yet. im gonna keep my stock heads and just do some good porting on them.. im trying to keep this more of a street car that sounds good and has some decent power and i can still dive to work everyday if i wanted to so the lt4 cam set looked to be the best but its gone up in price since a year ago.. so if anyone has any other cams that are close to same as the lt4 and had good luck with them im all ears