Tuned Port Injection

[gnvair]

TPI your talking GM first real MPI fuel injection

You want to say the LT1 is superior, well of course it would be better on they would not have moved on to it

TPI is super simple and reliable

1985 tech vs 1992

Actually GM had multi port electronic fuel injection in 1975 on the Oldsmobile 350 used in the Cadillac Sevilles (using Bendix electronics).
The first sequential multiport electronic fuel injection for GM was on the 1984 Buick Turbo Regals and Riviera's

 

[TURNA]

Actually GM had multi port electronic fuel injection in 1975 on the Oldsmobile 350 used in the Cadillac Sevilles (using Bendix electronics).
The first sequential multiport electronic fuel injection for GM was on the 1984 Buick Turbo Regals and Riviera's

Ok you are still talk old vs newer tech

 

[gnvair]

Ok you are still talk old vs newer tech

No I am trying to explain that Chevrolet did not have multiport efi first. They also did not have sequential first.

 

[Wagonman100]

My buddy has TPI off of a 305 on his 327 in a ‘68 Camaro and it runs well. Not a radical engine, just a cruiser with a little lope. My 355 in the El Camino produces good low and mid range power. The thing you have to watch on the cam for TPI is the lobe separation angle.

 

[xitabl442]

I did mine when LSs were just available and out of my price range. I also wanted the TPi for looks. It has all the power I need to burn the tires off. Just a cruiser. I also have a mostly complete TPi from a 305, minus the harness. My harness came from Affordable Fuel Injection, I think they’re still in business.

My

 

[ronnyinwaxhaw]

EFI Connection uses LS ECM'S which are tunable too.

Thanks for the tip! I'll look them up!

 

[ronnyinwaxhaw]

I did mine when LSs were just available and out of my price range. I also wanted the TPi for looks. It has all the power I need to burn the tires off. Just a cruiser. I also have a mostly complete TPi from a 305, minus the harness. My harness came from Affordable Fuel Injection, I think they’re still in business.View attachment 132146 MyView attachment 132147

I was checking out Affordable Fuel Injection because they make a cool kit for using a GM TBI in a retrofit on a 4 barrel intake. I already have a Air Gap on my engine (waiting to be picked up from the machine shop). But all of the comments to my question have been helpful to convince me to convert to EFI.

 

[jlcustomz]

I had a tpi from mid 90's till my ls swap in 02'. Though you had a list of faults with em, there was no ignoring the torque they produced especially on a 350 or 383 with a ported intake & tb, etc. On the typical street engine back then with higher gearing, it helped make up for that. Some good examples, such as TPIS built 383's put out over 500 ft lbs torque & good hp for the 90's. Fast forward to today & it's still badass for a driver.
Biggest issue now is building up an engine from scratch & updating a system with new wiring & modern parts can quickly exceed an ls transplant cost.

 

[ronnyinwaxhaw]

I had a tpi from mid 90's till my ls swap in 02'. Though you had a list of faults with em, there was no ignoring the torque they produced especially on a 350 or 383 with a ported intake & tb, etc. On the typical street engine back then with higher gearing, it helped make up for that. Some good examples, such as TPIS built 383's put out over 500 ft lbs torque & good hp for the 90's. Fast forward to today & it's still badass for a driver.
Biggest issue now is building up an engine from scratch & updating a system with new wiring & modern parts can quickly exceed an ls transplant cost.

FAST EZ EFI has a version that will run a TPI that I'm really interested in.

 

[jlcustomz]

I'm not up to date on any of these new systems, But I know some of them, possibly the efi connection system convert things over to using individual coils & when things are said & done, you're running all later model technology on top of your tpi, gen 2 lt, or whatever sort of engine & efi intake you have or can build.
As far as brands, I'd trust anything Holley company based (FAST) or many using mainly later factory type components and wiring connectors. I wouldn't want anything Edelbrock & not comfortable about these offshore brands at all. Motec is a popular system with off road & imports, no personal knowledge there.
With whatever system is used, proper tuning for the system to be in the proper parameters for the sensors to be able to finish fine tuning it is where many go wrong setting things up. Self learning only learns within given parameters.
In general MAF setups can final fine tune for the street better, but speed density systems are easier to tune especially for modified engines. Also in general, late model factory computers have more capacity than given credit for, but aftermarket are much simpler for many to set up and modify parameters.