hey guys just wondering if any of u has taken off there tpi and added a mpi system if so did u get more power or less

 

What is a MPI?

 

multiport injection

 

TPI is a form of multi port injection. More than one port is is getting injected.

 

also i was wondering how much more power does a newer tbi with 8 injectors with 4 barrel throttle body

 

?????????????????

 

sorry not tbi im ment would u get more power if u remove a tpi and put a efi with a 4barrel system on a l98 would it make more power or less

 

This Four Barrel Throttle Body system is Accel's simplest EFI conversion kit. It can be recalibrated for more power or different engine sizes by using Accel's CalMap software. The system bolts onto any intake manifold with a standard 4-bbl bolt pattern, and features true closed-loop EFI operation. The system includes the 750 cfm throttle body assembly with injectors, fuel rails, wiring harnesses, ECM, sensors, air cleaner, fuel pump, fuel filter, gaskets, hardware

http://www.yearone.com/serverfiles/f...ain2.asp?cat=G and instructions.

 

Are there two different people under this same name,91Z28CAMARO32?

 

no y?

 

Tom --- He's talking about the Edelbrock (Holley makes on too) system with 8 injector in fuel rails and a throttle body similar to a carb for the air entry.


I had one of the Holley systems on a 454HO (455HP dyno'ed), and it worked okay. Takes a very long time to tune it to run right though.

If you have a current TBI unit on your motor, it would be a lot cheaper (and work just as well) to swap over to a factory TPI unit and get into prom burning for them. I actually think it would work better than the much more expensive Edelbrock and Holley setups.

If you already have a TPI, then just but the chip programming stuff. Your learning curve will be about the same, benefits about the same or maybe even a little better, and save a bunch of money.

Just my opinion, YMMV.

 

As to your question about the power factor switching from a Edelbrock Pro Flo or Accel Pro Ram.....I have seen dynos where the 4 barrel systems lose a lot of tq compared to the tpi system in the bottom end however it picks up hp in the upper rpm band and keeps the torque up instead of dying.

 

Yenko got my burning question.

Define "power". We all understand the technical definition of power, or work, as:

RPM · Torque ÷ K (5252) = Horsepower.

Simply stating "power", however, is really subjective. That can mean different things, depending on a given perspective. More torque at lower RPMs can be considered more "power". Almost no torque but insane RPM can technically make more horsepower (the import theory of "power"). Or a broad, flat torque curve across a very wide RPM range (like the LS7) can mean more power.

What exactly are you seeking?

 

Its all a matter of personal preference on what he wants to have. I know from switching from a 350 to a 383 just in TBI there is a huge difference on the bottom end. Stock Tpi is great for this kind of power however if you want a 11 second street car then a SuperRam or a Pro Ram would be better suited for that application. However, if you want 400 ft lbs at 2k rpms....tpi will definately get you that but you will sacrifice in the 5k rpms. Hope this helps.