Street Lethal

^ Come on over to ThirdGen.org regarding welding in your own bungs, we're always discussing similar concepts in comparison w/the stock TPI, HSR, LT1 & Miniram conversions. Click Here....

ponyhater27

iTrader: (11)

Yea I would fab up my own deal to mount the TB to. I'm pretty sure that guy's dad fabbed his up for him. If you use your HEI what are you going to do with your computer and not having a crankshaft position sensor to calculate spark timing of your engine? Can you tune that out I wonder? Just something to think about. There is also another distributorless system that you could use in your application besides the one with LS1 coils if you can't get the HEI to work. http://www.delteq.com/index.htm Looks like a good deal for $700.

fastcar65

i dont have anywhere near $700 to spend. i plan on spending around 500 on this whole project. the very first tpi motor, 1985, used the hei distributor. the tach lead is what is plugged into the computer with some sort of filter on it. correct me if im wrong.

Street Lethal

Tuned Port Injected engines didn't use a Crank Angle Sensor, as ESC (Electronic Spark Control) was controlled through the CC (computer controlled) HEI distributor. A used TPI dizzy can be found for very cheap, in fact, I have about three of them just lying around the garage....

fastcar65

hmm, would u mind letting me purchase one of those bad boys from ya?

Street Lethal

The distributor's themselves are pretty much the same (referring to the computer controlled versions from GM). What you'll also need to obtain is the pigtail from the engine harness, to the ignition module. The dizzy's themselves though are pretty common. Click Here, although this came from a TBI system, it's the very same unit found on the TPI's....

ponyhater27

iTrader: (11)

Ok I understand. Thanks for clearing that up for me.

transam5.7lt1

iTrader: (18)

Interesting! I have a 1975 camaro and I always like the idea of transplanting a LT1 in there with the pcm and harness! I'll be checking back here for info, thanks in advance for the info!

ZONES89RS

iTrader: (25)

A TBI and TPI distributor are the same??? Or is the ign. cont. module just different???

fastcar65

i would imagine they are the same because the tpi is a batch fire system. it doesnt need extremly precise instrumentation.

ZONES89RS

iTrader: (25)

Well, that would be funny, i bet if they were people would sell used ones for more that used TBI dist.

fastcar65

so ur sayin they arnt...

Street Lethal

The main difference between the two systems is ECM capability. I have two distributors from each individual system, and they are the same (the only variance would be that the earlier TPI distributors had an internal coil). The swap from TBI to TPI is very common, with the majority of people keeping their stock TBI distributor's to make the swap a lot less costly. There are many parts that interchange, including sensors and relays....

Street Lethal

But this concept is a little late though. They were in fact selling for a great deal, once upon a time, but with the advent of the LT1/LT4/LS1/LS6/LS2 and LS7, how much do you really think one could get for such a prehistoric TBI piece nowadays? Case in point, I recently purchased a 454-Throttle Body for $50.00, when, once upon a time, you couldn't find one for less than $200.00....

fastcar65

thanks for clearing that up. thats what i thought, but being new to this whole fuel injection stuff, i wasnt sure.

are the new ls motors batch fire like the tpi's?

Street Lethal

No, sequential.....

Also, for those curious about the older TBI to TPI swaps, click here....

CarAteMyMoney

iTrader: (2)

I did the swap.. very straightforward but occasionally you need some creativity. PM me if you have any questions

fastcar65

ok thanks for ur help. but which swap are u refering to? cause we have talked about several here.