Thanks, guys!

Talked to Patrick at Griffin, finally. First, he thought I was nuts running the stock radiator. <img src="/forums/images/graemlins/smile.gif" alt="" /> Had trouble figuring out how that ever worked. Anyway, a new radiator from them is in the works. 3" core, with dual 1.25" tubes.

The ECU just isn't completely happy. As far as I can tell the 3.0L used 210cc injectors and the 3.5L used 275cc injectors. Or there in abouts.

The 3.0L ECU fuel trims are in the negative rage far enough that it's having trouble scaling back further on steep descents when you let off the gas. Enough that I can barely hear what's happening in the exhaust - but the issue is there.

Part of my ECU problem is the heat, of course. IAT temps are way up there because of ambient temps. The engine is running too warm because of the cooling issue. But, the timing for the 3.0L is just a tad too aggressive for the 3.5L over about 2800 RPM. Seems to be very similar to timing a Chevy small block 350 vs. a Pontiac 350.

So, I'm looking for a '99 3.5L Fed ECU, checking into Tactrix Openport and EvoScan and looking at MegaSquirt and other piggy-backs.

Edward