TBI question

[SFROMAN]

Alright well i dont post here often but I read through threads quite often and use this site for info.

Well I have a question that I hope someone with some knowledge can answer.

I own a landcruiser FJ40 with a 350 SBC in it. The motor came out of a late 70s camaro and is currently carburated.

I found a TBI system for sale in the classified section and I want to know if it will work with my engine?

I believe the system is out of a 89 truck but I am still waiting for more info from the seller.

New fuel injenction systems are in the thousands of dollars so I am hoping that this will work and save me quite a bit of cash.

Any info, comments, or suggestions would be greatly appreciated.

Thanks
DEL

 

[lilfoot]

For startsers you need to gather a few parts to go along w/tbi like a set of 86 n up heads as these have a different intake angle. You'll also need to get a pcm w/ harness, high preasure fuel lines and most likely an inline elec. fuel pump. I think tbi units run on 35 to 42 psi and you block off the manual pump. I also think they have a different dist. even though it's still called HEI. These are just some of the things I can think of off the top of my head, anyone else care to chime in?

 

[Ron]

Taking a SBC from carb to EFI is damn easy.
You need the throttle body (duh)
Some way to get it on the intake...this can be a TBI intake and youbore the holes out or just an adapter plate where you bolt the TB to the carb mounting holes.
Next you want the dizzy
Then you need an ecm
then you need a fuel pump and to modify the lines a bit
Finally whatever sensors you decide to run...(this is my opinion) O2 is a must, if I was going through the trouble Id have MAF, tps is a given...beyond that it gets into theory and debate....

Alright well i dont post here often but I read through threads quite often and use this site for info.
Well I have a question that I hope someone with some knowledge can answer.
I own a landcruiser FJ40 with a 350 SBC in it. The motor came out of a late 70s camaro and is currently carburated.
I found a TBI system for sale in the classified section and I want to know if it will work with my engine?
I believe the system is out of a 89 truck but I am still waiting for more info from the seller.
New fuel injenction systems are in the thousands of dollars so I am hoping that this will work and save me quite a bit of cash.
Any info, comments, or suggestions would be greatly appreciated.
Thanks
DEL

 

[Ron]

For startsers you need to gather a few parts to go along w/tbi like a set of 86 n up heads as these have a different intake angle. You'll also need to get a pcm w/ harness, high preasure fuel lines and most likely an inline elec. fuel pump. I think tbi units run on 35 to 42 psi and you block off the manual pump. I also think they have a different dist. even though it's still called HEI. These are just some of the things I can think of off the top of my head, anyone else care to chime in?

you dont have to change the heads only the 4 center bolts are different and you can drill out the intake and run a washer (ghetto but it works)
or get an adapter plater for ~$50 to bolt the Tb up to the intake
block off plates are super cheap...but avoid the chrome ones they suck
you WANT an cpu controlled dizzy...its probably the most important part of the swap...and your fuel prressures seem off to me....I havent fawked with TBI in a few yars but I swear thats too high...I have a notebook at home Ill look it up for ya. 2000 pumps work fine

 

[transman731]

sbc tbi fuel pressure is 9-13psi

 

[ltoy]

Going to TBI is easy
You need the following:

1. Complete TBI Unit
   • Both Fuel Injectors
   • TPS Sensor
   • Fuel Pressure Regulator
   • Some way to bolt the unit to your engine (either Adapter or factory Intake)
2. Temp sensor
   • Not the same as the Temp Guage Goes into the intake before the T Stat
3. 02 Sensor
   • Use a factory manafold and put the sensor there if you can
   • Put this as close to the manifold as you can if not using a factory Manafold
   • Do not put this at or after the collector unless you run a heated sensor
4. Map Sensor
   • Some years used a MAF sensor instead of a MAP sensor these are rare in TBI
5. Electronic Controled HEI dizzy
   • There are 2 flavors of these some of them look just like the
     standard HEI but have and extra plug. The others are the small cap With remote Coil
   • Try and get one that Matches your Harness to avoid plug swapping
6. ESC Module
   • Knock Sensor
   • Knock Sensor Harness
   • Not used on a factory 454 TBI
7. ECM
   • 1227747 is the simplest if you can find it
8. Harness
9. Electric Fuel Pump
   • Put the Pump in the tank
   • Use a 3/8 feed and return line
   • Don't skimp on the line size
   • TBI requieres between 9 and 13 psi for a small block
   • Keep the return big and you will put less stress on the pump
   • The pumps in the tank are cooled by the fuel and last much longer in my experience
   • External Inline pumps will work but do not get one that puts out more that 20 PSI as it will overpower the Regulator

Don't be afraid to modify a stock harness. Is very easy to get these things to run.

 

[Yay!Gurrr]

Unless you want to do some tuning, you will need to swap in a TBI camshaft. Otherwise you will have to do some tuning. Carb. cams generally have less vacuum at idle and produce a lumpy signal. The ecm will see this low vacuum signal as load and dump more fuel causing a rich condition.

 

[Caver Dave]

but avoid the chrome ones they suck

Oh really?

you WANT an cpu controlled dizzy...its probably the most important part of the swap

I agree... dynamic fueling it is nothing compared to BOTH fuel *AND* timing control

Is very easy to get these things to run.

I agree with this also... Just do NOT equate "easy" with quick/afternoon project/100% bolton! I spent months of nights & weekends swapping a GM TBI onto my AMC 304. I could've done it lot faster, but choose to read everything 3 times, do all the work at a relaxed pace (we all know what happens when you rush) and quadruple checked everything twice!

Once you learn how the TBI works, it's a very simple system... just not an "easy" slap-it-in kinda proposition!

Unless you want to do some tuning

And while I haven't gotten to the point of doing my own tuning like Yager, I can offer a couple suggestions on tuning.

- A $3 (RS parts) cable and WinALDL (freeware) will handle logging/monitoring the 1227747 ECM just fine!
- The OEM chip/carrier in the 7747 is a royal PITA to mess with if you need to pull it out, reprogram, & reinstall very often and requires a UV eraser. I went with a ZIF socket (Moates.com) & cheaper/larger capacity/electronically erasable chips (fleabay). This lets me change the tune ,supplied to me by others, in about 60 seconds (actually takes longer to pull the ECM cover than it does to flash!)

 

[ltoy]

I agree with this also... Just do NOT equate "easy" with quick/afternoon project/100% bolton! I spent months of nights & weekends swapping a GM TBI onto my AMC 304. I could've done it lot faster, but choose to read everything 3 times, do all the work at a relaxed pace (we all know what happens when you rush) and quadruple checked everything twice!
Once you learn how the TBI works, it's a very simple system... just not an "easy" slap-it-in kinda proposition!
And while I haven't gotten to the point of doing my own tuning like Yager, I can offer a couple suggestions on tuning.
- A $3 (RS parts) cable and WinALDL (freeware) will handle logging/monitoring the 1227747 ECM just fine!
- The OEM chip/carrier in the 7747 is a royal PITA to mess with if you need to pull it out, reprogram, & reinstall very often and requires a UV eraser. I went with a ZIF socket (Moates.com) & cheaper/larger capacity/electronically erasable chips (fleabay). This lets me change the tune ,supplied to me by others, in about 60 seconds (actually takes longer to pull the ECM cover than it does to flash!)

X2 On this. Not an afternoon project at all. It takes time and Is best if you read / learn all about it that way if it has a problem you can get back going or at least get it home.