GM TPI tips for a newbie

[Shannen Durphey]

Hi, Charles.

The first thing to consider is that the early style TPI is a great
torque producer, but tended to run out of oomph! above 4500 rpm.  What
rpm range is your 406 built to make power in?

Next is that the larger the cam, the more "tuning time" needs to be
invested in order to get "bug free" driveability.  There are many
stories around of chip tuners who just couldn't get it right.

There is a lot of information contained in the letter archives for
this list, which can be linked to from here
http://efi332.eng.ohio-state.edu/diy_efi/

And this page has a fuel injector size calculator:
http://sura1.jlab.org/~grippo/auto.html

Have fun, and welcome to the list.
Shannen

diy_efi at efi332.eng.ohio-state.edu wrote:
> 
> Hi all, I joined the list to gain more info on EFI operations
> and maybe a little knowledge, If I don't get lost too quickly!
> 
> I have a 1987 Monte Carlo SS as a pet project. I recently
> installed a built 406 and I've been contemplating an EFI swap.
> Well, I stumbled onto a TPI setup from a 1985 5.0 Camaro and
> contemplation time seems to be over :)
> 
> The 406 flows A WHOLE LOT MORE AIR than the 5.0 so I know I
> need to use larger injectors. My guess was 28-32 Lb units but
> I'm not sure. I've spoken with a few places about a custom
> chip for the ECM but everyone seems to carry "Off the Shelf"
> chips instead of doing any custom work. I'm unsure of my
> options at this point.
> 
> Charles