I have a stock 92 MPI 350. I'm adding a blower and did not want to use a after market ECU, because I would lose the gauges (and price!) So I was hoping to get some help on what I need to adjust on the prom. I will be running 6lbs of boost and changing the injectors for stock 24 to 42. So any suggestion on what I need to adjust on the injectors, timing, & etc. would be helpful!!!!!! If you can't tell this is my first, so suggesting everything I need to adjust would be helpful and/or examples would also help. Thanks GREATLY!!!
P.S.
I was looking at a MSD blower retard box for the timing, but can't you get set it in the spark table?
:auto:

 

What makes you think you need 42# injectors?

 

It's what BDS told me! I what going to the stock ones for now, but they said I needed 42 if I use 8 injectors or 24 if I use 16 injectors! I wasn't sure about that but until I learn better, I took their word.

 

If you are going to add a blower to your 92. I would suggest going to either Vortech, Procharger or Carrol Supercharging. These guys have done lots of Vettes and have a proven system for stock engines. Their kits will have everything you need for the installation. If you need injectors they will be included in the kit. Installing 42lb injectors will require reprogramming your prom to handle the additional fuel.

Even as BDS is a great supercharger supplier, their forte is not supplying aftermarket kits for Y bodies. Now if you got some show or drag car application that will require a large efi injected 6-71 blower they can help you.

Votech supplies if I remember right for a 92/93 LT1 Corvette they included a set of larger injectors with their kit plus a FMU to cover boost enrichment. I don't care for the FMU route but it does work and thats what comes with their kits. There are better ways for boost enrichment. Check with the above mentioned suppliers and see what they have to offer. Thats the best advice I can give you.

 

Thanks for the help! But the blower I am using is from SuperchargerUSA, And it is for show more than power. Even though I have a lead foot it is lighter as I get older. So this is more for looks and learning experence. So now I'm back to still trying to modify my prom! :thumbs:

 

So what kind of a blower did you or are you anticipating on purchasing? If is only 6 lbs of boost and if you don't want to use a FMU (highly recommended) going to 42lb injectors is not a bad idea. And no matter what you will have to modify your prom for better peformance in anyway. Is you car an LT1 car? As you know Tunercat is available for modifying your prom in any fashion you may wish.

 

The blower is a 671 for SuperchagerUSA, with a 8 injector plate. I haven't decided on using a FMU, but I would rather not. I might if I have to but, I'm trying to get around it! No, its not a LT1, but it is a multi-port fuel injected 350. Also I'm been messing with GMECM, so I thought I would use that to modify the eprom, plus I don't what to spend to much on software until I know if I like that software or not. I have heard of tunercat but the demo did seem to let me try much, and didn't seem to any more that GMECM. BUT, I still am trying to get more info and suggestions before I try my first mod. I'm not sure on the actual addesses that I need to mod, also I'm not sure all what I need to mod. Thats why if I can get someone to do the mod or has done the mod already so I can see what and where to change! I'm try to see all the parts I need to change so I don't miss anything that could cause trouble. So far I have only modified the body and interior! Now it's time for the motor! I will build a stronger bottom end stroker later but for now I figured I better learn to mod the prom first!!! You can see a pic at http://www.users.conninc.com/knight ,but there still more on the inside!

 

Hmm well here is another alternative. You can replace the factory ECM with a ECM from a turbocharged Syclone truck. It will control boost enrichment as its already programmed to do so. It will almost just plug into your existing harness with a few minor pin changes. That is if your car has a 1227730 or 727 ECM now.

Here is a link to a site that tells you how to do it all. Its been done for a F body many times over. And seeing how the F body for 90-92 uses the same ECM as a Corvette I don't see any reason as to why it would not work. There are some minor differences such as the 749 ECM does not have provisions for Canister purge, air pump and air divert solenoids but those devices can be rewired to work in other ways. Plus there is a bin file you can download thats was their last tested BIN for their supercharged 6 PSI F body.
http://www.speedtoys.com/~bort62/7749/Index.htm

If you downloaded Tunercat and just poked around in it. The demo version only has a $42 definition file for an old 1227747 ECM using an old 4k eprom. That was one of the most simple TBI ECMs made. For your ECM you will need to purchase a $8D definition file. There is double the amount of editable tables for your ECM vs the old 747 ECM.

Check it out it could be just what you are looking for.


[Modified by tjwong, 4:46 AM 4/16/2003]

 

Sorry for the off topic but had to ask, can tunercat control a 96 LT4? :cheers:

Paul

 

Unfortunatley at this time TC cannot program a 96 OBD2 car. Someday this year we do expect a OBD2 package. But it does OBD1 and most everything before it quite well. :party:

 

Thanks again, but as for the ECM swap, CAN'T! My ECM is a 16173861. One of the other reason I wish to program my own instead of an after market is becuase most of my dash gauges run through my ECM and if I use an after market ECM I lose them. So as of now I still wish to program mine!

 

So what can be used on a 96 besides LT1-Edit? And BTW is LT1-Edit any good? I mean tables, functions, and features, etc?
Thanks, but once again sorry for stealing the topic.

Paul,

 

Nothing else is available for a 96 LT1 but LT1 Edit. Functionally it is pretty good, basically the same format as LT1 edit for the OBD1 cars. You can edit fuel, timing, transmission, and all the other necessary tables that you need including gear ratio and speedo calibrations.

 

Does your car have a LT1 engine? I ran a check on your ECM number, I can't find a record of it in my books. A 92/93 Y and F body should be using a 16159278 ECM. I will do some research for you in the morning. In the mean time double check that ECM Service number and make sure its right. If its a LT1 engine you should have the number I posted.

There are other ways to connect an aftermarket ECM such as a DFI or FAST system. And that is to connect it via a PIGGY BACK method where the two ECMs share the signals. One ECM takes over for fuel management and the other remains in place to give you your dash functionality. If the number you gave is correct then there is not a ECM definition file for TunerCat to edit its PROM tables for you to tune the car. I will check and repost later.

 

I was at the dealer today and we could not find your part number that you posted as your ECM. The number I posted is supose to be the correct number for a 92/93 model year Y body.

 

Sorry! Your correct. Iwas in a hurry and typed the wrong number, My ECM is 16159278. I don't know were the other number came from. I've been trying to read up, to find out as much as I can, becuase so far everyone is asking question and giving suggestions on what they think I sould do. BUT, none have been answering my question so I can learn what I need to change. I thank I have found out what I need to change, but it would be nice to know that I don't miss anything that I didn't know or forget about. :grouphug: