From what i've been reading people doing the tbi to tpi swap seem to be doing fine with the "painless wiring kits." Either that or they end up rewiring the stock harness (which i'd rather not get into). Which leads me to my point.

I have a tpi 89 firebird engine (and wiring harness, and ecm) and im going to be installing it in my tbi 91 camaro.

Can i replace some of the stock tbi wiring with the firebird harness?

Or will i need to find a tpi harness out of a camaro? Or should i buy a "painless kit?"

This is going to be a winter project, so im in no rush.

Thanks,

 

This link might be helpful:

https://www.thirdgen.org/techbb2/sho...=repin+tbi+tpi

 

Does this imply since i have the harness i have another option? Possibly a better option?[

 

I just thought the link might give you some ideas. I plan to use the method described, but haven't done so yet.

Considering you already have the other harness, you might be better off using parts from it, but I haven't researched this.

 

Are you going from tbi (91 or 92) to tpi as well?

And, it did give me some ideas, i'll do my best to apply them to my situation.

 

I'm currently building a brand new TPI harness best suited for any 90-92 F-Body (it is the exact length of a stock F-Body TPI harness). It includes the IP connector under the dash. Installation requires simply plugging the harness in under the dash and splicing only a couple wires to your harness that comes out of the driver side firewall near the fuse block. You'd have to reuse that bulkhead connector and the wiring that goes to the starter, wipers, etc. I can help with the installation by providing detailed instructions for the couple wires that need spliced (and I really mean only a few) and I'll give you my phone number.

This harness has no provisions for emissions. It does have two electric fan relays. It is a speed density harness (but I can build a new MAF harness). It is best suited for a 90-92 F-Body, but I can repin the IP connector for a 86-89 F-Body. Each year is different, so I'd need to know what year your car is. I was going to put it up on ebay for $375.00 shipped, but if someone is interested, get ahold of me within the week. The harness should be done this Friday.

 

Scotty,

My car is a 92 RS 305 TBI. My plan is to replace the 305 with a 383 using the Holley stealth ram intake. To use the HSR, I plan on swapping to a speed-density style tpi harness. I've done a lot of research on the swap, but so far my plans are bigger than my budget.

 

I appreciate your thought S10Wildside, however, if i could convert the tbi harness i have. I believe it will work out a little better for me. Mostly because i dont have the funds right now ^_^.

Anyway, there are a few articles on these boards, and i have a chiltons manual. There is all of this informationand i need to decide wahts relevent to my situation. I suppost what i am looking for, is what i will need to make my situation work. And it looks like the easiest way will be to repin the tbi harness i have.

Thoughts?

 

If you are looking for an easier way to add TPI to a TBI car, Street & Performance offers an adapter harness, I believe they call it the Integrator or something like that. Its designed specifically so you can add TPI to any TBI vehicle. Not sure of the price, but all of their stuff is very high quality in my experience.

 

If you have the right service manuals (wiring diagrams), then you should have no problems converting your TBI harness. To be totally honest, I don't have time to give you all the details. If you have a very specific question, let me know. I have helped people in the past (through the phone and email) with conversions and it always requires more of my time than I can give.

 

Ok I convertred a 88 TBI harness to the 90-92 SD style. Now I dont get he FP clicking on when I turn the key and the injectors dont pulse. Any clue as to what the problem might be? Oh and the chip was burnt right for no VATS either

I know the wires are in the correct order, I must have went over that about 3-5 times.

Kat

 

I'd start with the fuel pump relay. Pull off the relay and jump the orange wire to the tan/white wire. If the pump does not run, you don't have the tan/white wire connected to the fuel pump or the orange wire is not connected to a 12v battery power source.

If it does run, take another look at the ECM.

Terminals B1 and C16 should have 12v power at all times.
Terminal A6 should have 12v power with the ignition on.
Check all your ECM grounds.

If that is all correct, check out the fuel pump relay.

The orange wire should have 12v power at all times.
The black/white wire should be grounded.

Turn the ignition on. If the pump does not prime, then either the green/white wire from the ECM to the relay is broken or the tan/white wire going from the relay to the fuel pump is broken.

 

It's getting to be summer now and i'm finally going to have time to do my plans, but after rethinking and considering lots of possiblities I have myself very confused...

I have a 91 with a 305 tbi in it now, do I have speed density now?

Next, whenever I drop this engine in, can I just use the wiring harness and ecm that it came with? Why/why not what are the advantages/disadvantages.

Is getting a 91-92 ecm and repinning my 91 harness the easiest way to get back on the road?

If I havn't meantioned the best/easiest way of getting all of this working, please by all means give me suggestions. Once I know exactly what I have to do to get this on the road, i'll feel alot better and things will get accomplished much faster.

Oh, and on a side note, why do the later model TPI's have more HP than the earlier years?

Thanks,

 

The easiest way is to get a TPI engine harness from a 91 car. The next easiest way is to have your TBI harness converted to TPI. Depending on the year of the TPI harness you have, the next easiest way is to repin that harness for your 91 car.