I'm toying with the idea of converting my carbureted 540 BBC to EFI for my other car. I've been messing with my '90 IROC TPI 7730 & $8D (Prominator, TunerPro RT, etc). Just wondering if this same technology would transfer to a larger big-block. The 540's got a very streetable Crane solid roller cam, rect-port alum heads, headers, etc, no smog reqt. looking at the Edelbrock single-plane Victor-style manifold (cost-effective), already got spare 7730 ECMs & other TPI EFI parts. just wondering if there's GM design constraints inherent in the 7730 w/ $8D which would prevent this from being do-able.

 

Yes, it's doable, but there's an inherit flaw in the code when applied to big injectors/ CID. Maybe someone else can remember the thread on this, I'm having a senior moment....
Other then that, you should be good to go.

 

I too have the same thing in plan, 489 cu BBC stroker, 96 model vortech truck intake, mild roller cam.

If someone knows the flaw let us know.

thanks.

 

Might try searching.
Patches, comes to mind.

 

You don't actually NEED to use the correct injector flow rate and displacement, it just helps the numbers look better, and makes it easier to adapt to different injectors or fuel pressures.

The airflow calculations probably cancel themselves out somewhat, i.e. if something uses airflow, and you increase the displacement value, you'll probably need to reduce the effect of that in the calibration in order to get it to behave correctly and to behave the same way as if you didn't change the displacement.

 

If I'm not mistaken Rbob or myself added it inot the sticky sections above.

Was basically a calculation that limited flow and made an artificial fueling ceiling.

later
Jeremy

 

Here's the "fix" thread that I think is being referred to:

https://www.thirdgen.org/forums/diy-...t=pe+pw+fix+8d

I'm almost positive that this "fix" is implemented in Super AUJP version 3.