Hi, im planing on running an air gap type intake, i would like to drill it out for 8 injectors like a the tpi's and lt1s have... but i dont want to run all that wiring... what do i have to run? besides the computer to get them to fire right? what's easier to burn chips for tpi's or lt1s and witch cost less? any help would be great!

 

You need the wires. There is no way around it. All multiport set-ups from TPI, LT1, LS1 and aftermarket have basically the same amount of wires. It is a closed loop feed back system. Therefore you need wires to feed back sensor data to run the system. Chip burning stuff is slightly cheaper than OBD1 and OBD11 programmers but if you do not have a true LT1 there is no need to convert to it. I don't even think you could run an LT1 ECM system on a distributor Gen I motor. It would be pretty pointless even if you could. They make aftermket multi port kits specifically tailored for Gen I motors.

 

so TPI is my only option, which i'm fine with as long as its the same or easier to tune then its all good. What other types of sensors do I need O2, MAF, etc? What do I need to get the injectors to fire right? How are the injectors told when to fire, by computer or is it a crank sensor, or distributor then relayed to the computer? I'm new to this TPI thing. I have thoughts about adding force induction, then what do I do about the computer issue? I'm going to run an air gap type manifold which will be custom fabricated for the application I'm about to embark on.
-Thanks

 

The ECM will tell the injectors to fire. it is the brane of the car and the chip, which goes into the ECM, has all the parameters in it for the engine. Those partameters need to be changed to make the car run right if any mods are added. The parameters control fuel, spark and the whole nine yards. You will need every sensor that the ECM rellys on. A donor motor should come with everything you need. Some of them I would buy new for added insurance. You will need an 02, CTS, knock sensor, ESC module, and fan switch. Those all send important data back to the ECM so that it can mainatain the proper fuel and spark. Read up in the DYI PROM board for getting started with Eproms (chips). A few searches on basic fuel injection on the internet will also help you out. All closed loop FI systems are basically the same.

 

Shifty, the fan switch sends data to the ECM? I thought it was just a thermo-switch that simply turned the fan on.

 

In a stock application, the primary fan is turned on by the ECM. The ECM reads the coolant temp (CTS sensor) and grounds the circuit to the electric fan relay when the temperature specified in the prom is met. The second fan turns on when either the A/C is turned on or when the coolant gets hot enough that the temp switch in the passenger side head closes.

The 1227730 ECM has a second output for turning a second fan on at a specified temperature. This was not used from the factory, but is very convenient for engine swaps.

 

So the fan switch on the passenger side head is only for the secondary fan? My primary fan doesn't come on while I'm driving, but it came on when I had to fetch a SES code, which tells me that the fan motor and relay are ok. I'm glad I read this, I was about to replace that fan switch.

 

Keep in mind that, for speed density systems, the primary electric fan is disabled beyond 35mph. That can be changed in the prom, but the factory disable speed is 35mph. Tuner Cat isn't showing me if the MAF systems disable the fan at a specified speed.

 

Yes

 

OK, thanks for the heads up.