Pro

Just curious if this is possible or even logical (to swap out the TPI in the car and put in MPFI).

I guess theoretically it could work. Just get the kit that comes for the 93 and older trucks with 700R4, and then use the chip that comes with it.

The kit will even let you use vortec heads.

And I am told that the MPFI kit is a little more effecient than TPI.

http://www.edelbrock.com/automotive/mpfi_sb.html

Stekman

You do realize that they come with calibration modules that allow you to tun ethem to your liking. Those instructions merely say how they can replace a 5.7/7.4L TBI with another TB-based unit.

EDIT: Why not just by one for 'normal' sbc's. Like the 3500.

Pro

This isnt a TBI based unit.................................

MPFI in action (in a truck though):
http://www.pswired.com/95yukon/performance/383-0-60.wmv
http://www.pswired.com/95yukon/perfo.../coldstart.wmv

That there is the MPFI kit with vortec heads. Being that the L98 is the same block as the trucks, my point is that maybe this kit is more effecient than TPI in a camaro.

Stekman

I did not say it is a TBI based design. Read carefully. I said it is a throttle body based design. I did not say it is throttle body injection.

Just think, for a moment, if you will, about what the restrictions and limitations of the factory TPI are. The runners and the baseplate. They lack the ability to support the engine at higher RPMs with sufficient air flow. Anything that increases the air flow all around, and especially at higher RPMs is a vast improvement over factory.

Do a search.

Pro

Well yes.... L98 heads do not flow well. Vortec heads do. And from what I have read, L98 intake doesnt flow all that much better than a bolt on 454 or aftermarket (holley) TB.

Stekman

In your orignal post, you bring mention of swapping out the TPI. To me, that measn swapping the intake setup, not the heads. Therefore, in my view, that negates the Vortec option. With that being said, why look at the vortec setup if you aren't swapping to vortec heads? I am not sure if you are aware or not, but vortec heads have nothing in common with standard sbc heads when it comes to standard bolt on intakes. You cannot use non-vortec intake with vortec heads without extensive, and usually unsuccessful, modifications. The Vortec setup is for Vortec heads. That is it. So, in short, no THAT kit will not let you use vortec heads. Do they offer a kit that can be bolted to vortec heads, yes? Are they compatable, no.

For that matter, if you do want to get a kit, do not get the kit for TBI eqipped 5.7/7.4 engines. Get one from the list of pre-86 heads, 87-up heads, and Vortec heads. If you aren't getting vortec heads, get either the pre-86 or post-87 setup. Of dont burn the money on Edelbrock, rather get Holley. Holley makes a Commander 950 series which is essentially the same components. That is, if you want that intake design with that specific design of TB. Otherwise, there is the Stealth Ram. I would take a HSR over an Edel. MPFI any day.

The intake flow has nothing to do with what the throttle body flows. Sure, bolting a Holley 670 or 454 TB will increase air and fuel delivery. However, neither of those have any effect on what the intake itself flows.

But to answer what youve been told, yes the MPFI is more efficient than factory TPI. Then again, so is any other aftermarket upgrade. Anything that doesn't choke the engine by 5000 RPM. Also, the fact that the MPFI doesn't utilize a long tube runner design, rather the short runner which is better suited for air flow at higher RPMs. Then there is the TPI baseplate, which in itself is a flow barrier in and amongst itself. So, not particularly limited to "more efficient," it is more or less "just better."