PATRIOTIC1911

iTrader: (2)

I'm sure there are many threads that talk about this, but my question is specifically for my 91 Formula. I want to convert my 305 from the TBI and go TPI. I know I need the intake components, sensors, wiring, ecm, fuel stuff.
I thought I read somewhere that 91-92 are the only years that require some other kind of tweak and that it's not just a plug and play situation. I think it had something to do with the ecm?

N.J.-SLICK-1

Plus you must replace your intank low pressure pump with the Tuned Port high pressure unit!

92droptopws6

iTrader: (10)

90-92 TBI AND TPI utilize the same dash harness. I have modded quite a few.
You need:
TPI donor
TPI engine bay harness
730 ecu
TPI high pressure pump
While you are gathering parts for your swap you should consider all mods you plan on doing, do them all at one time to have a proper chip burned since Speed Density is quite picky on certain mods.You will have a new found love for your car once you swap that TBI set up OUTTATHERE!!!!!! No disrespect to anyone that has had success modding TBI but TPI is way better

sofakingdom

iTrader: (1)

I'd use Sofakingdom's™ Patented Copyrighted All-Rights-Reserved Eeeeeeezy© 2-Step Method®:

Step 1. Sell the thing you don't want.

Step 2. Take the cash you just got, and buy the thing you DO want.

It'll cost you less in the end, and is as close to risk-free as anything ever is in this hobby, since you have the opportunity to choose wisely in Step 2.

Deposit all royalty payments to my numbered Swiss bank account.

PATRIOTIC1911

iTrader: (2)

If your saying to sell the entire 305TBI engine and swap in a TPI. That would certainly be an option. If your saying sell the whole car and buy one that already has a TPI......no way. I just bought this car and it has already been restored and engine rebuilt a year ago.