if i got a miniram, would i need a egr delete prom? what else would i have to modify to use this on a 86 tpi car? would a ramjet be easier to use? also with either of these manifolds would i need to convert to sd? thanks.

 

Yes, you will need to have the EGR Diagnostics Switch turned off on the eprom, along with altering the "MAT enable temp for the EGR" to a number to ensure the ECM does not attempt to enable it - it affects the code if the EGR is enabled, even if the EGR is not present.

As for whether or not you will HAVE to conver to SD will depend on your engine. On a buddy's 383 Miniram with AFR Comptetiion heads, it looks like he is going to "max the MAF" at 5,000 rpm. The MAF system can only add fuel (in PE or WOT) up to 4,800 rpm, so the mixture cannot be tuned beyond 4,800 rpm. You will have to use one fuel setting for the entire rpm range beyond 4,800 rpm.

With SD, the VE tables support changes to 5,600 rpm and the PE tables (WOT) support additional fuel @ 6,400 rpm.

With a healthy 350, you can find yourself maxing the MAF just before 6,000 rpm. With a Miniram with it's ability to make useable power upto 6,500 rpms, 6,000 rpm is just too low.

MAFs rpm limitations for additional fuel is due to it's orignal design being for a 305 with TPI. For that, MAF is more than adequate. But for larger engines, especially with a high flowing intake like the Miniram; MAF is too limited. I have NO IDEA why they didn't extend the PE table to a higher rpm level.

 

Actually, the MAF PE table also goes to 6400 rpm, or at least it does in GMEPro. Might want to check with TunerCat to make sure they have the range correct in that table.

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Greg Westphal
'87 IROC 355TPI/A4

 

I know that our Diacom is still clicking off different block learn cell numbers @ WOT well beyond 4800 RPM. We've been as high as 6200 and they were still clicking off. I figure if there are different block learn cells above that point there must be fuel maps above that point, too.

A high flow MAF from TPIS (which we used)will also pass a lot more air before it slams into the 255 g/s limit, although the tuning must match the modified MAF's altered airflow and calibration (only TPIS could program our custom chip to work with the TPIS high flow MAF).