Any pointers on this conversion? i will be doing late next week hopefully. i think i have all the conversion components pre purchased.

Q#1. i see fuel comes in from front of engine currently. 454 TB fuel lines are to rear of TB. should i cut incomming fuel pressure line at
frame rail and splice in new and attach to firewall or whereever? return line remains as my FP gauge and FP REG is in front of engine off
alternator bracket.

Any help greatly appreciated.

 

Will it work? yes.
Is boring the CF TB's out to 2" a better answer? yes.

I redid all the lines in AN when I tried that.

You need to also raise the new lid up at least a .25 to get the fuel out to the outter runners. The .25 is a great way to get better fuel distribution, and increase the plenum volume. If I had had the time, I would have tried a .5 thich spacer. I've heard of a guy that built a .75 thick spacer and claimed great results.

 

i have an xram. 2 x 2.00 inch TB's bored. 3/8 inch current clearance to hood no more. i believe the fuel atomization in cold weather or cold plenum is terrible(xram design limitation). no exhaust heat to plenum as was available in crossfire.. heat soaked result is OK. the fuel flow from plenum floor into head intake reunner is a V shaped flow path result. the injectors currently spray directly on plenum floor. plenum is about 3/4 to 1.00 inch thick. oval shaped. i feel the 454 TB is a better answer. keep in mind air temps 35-55 deg often in wis.

 

Just one little thing Ron, you will have to nearly double all your IAC counts every where.. Remember that when we started tuning these crossfires with a std 5.7L TBI .bin, we had to halve them all because the 2 IACs were letting in too much air...

 

Cold start-up, yes. But the crossfire has a wonderfully designed coolant passage under the manifold. When the heater is on, ir puts a nice amount of heat into the plenum floor.

The plenum is everything under the lid.

You can believe what you want, but I've run both, and am just speaking from my experience.

 

That hasn't been my experience.
The CF TB's IACs have very small pintles, in the limited math I know the cross-sectional areas of the two CF pintles closely matched the cross-sectional area of the single large pintle of the other TB.

I had rather good luck with the stock IAC settings. I did at one time recut the taper and the CF TBs, to more limit there effect, with the 42 code.

 

thank you. i was expecting to reduce the counts as the CF had two of those deals. right now i only have one iac. the other is stuck closed(good thing) and not functional.i have no high idle but dont need it as car never dies. car just idles nice on cold start but a bit low. thanks for the input guys. i have a full season of use on the xram and now i will be in a position to compare the results of the conversion.

 

If running on one IAC, you might put a balance tube from the one test port to the other, so as to have the flow thru the two bodies as equal as possible at idle.