It's been a while since I have been on this site. I did a 6464 1050 2 circuit conversion with help from here several years ago and it worked awesome. We have since gone to a mild small block with a blow-thru gt45 turbo setup.
The carb is a "650HP" and I put that in quotes because it started life as a 4777-7 that got a main body swap to get adjustable bleeds and no choke horn. Everything else is still the 4777-7 parts. That means 2 corner idle block and base plate.
We originally had it set up with a T5 and it really worked pretty good because you modulate the throttle a lot with a manual trans. We have since switched to an AOD and have struggled with getting the carb to act right off boost. We are running 8psi and it works good at WOT, but has issues with tip in and part throttle. Converter is a 2000-2200 and is prob a little too tight.
Tip in has a big stumble and part throttle accel is stupid rich. Like 10:1 rich. Cruise in OD is 14-15:1 . Our elevation here is 3600' so the typical DA is pretty horrible.
Ignition is controlled with a Megasquirt and is completely programmable. I also use it to datalog.
Current setup:
IAB 45
HSAB 27
31/32 squirters
2.5 PV / blocked rear
65/78 MJ
pink cams f&r
I dove in and drilled the PVCR to 0.075" following the hangar18 blow thru instructions. In retrospect, this may have been an error. I may drill and tap these for brass set screws.
Anything glaringly out of place? I went down on primary MJ and went from a 6.5pv to a 2.5 to attempt to lean out the part throttle accel.
Car is crazy fun at WOT, but the street manners with the auto trans need to be better.
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It's getting better. The part throttle accel is much better,
PIAB 72
PMAB 25
SIAB 45
SMAB 36
39/32 squirters
2.5 PV front, rear blocked
65/78 jets
Blue cam front / pink cam rear in #2 hole.
0.075 PVCR
It is much happier with the air bleed change, but it still has this irritating lean spike. This is a pic of the datalog right at the spike.
I am at a steady cruise here, then try to gently accelerate and it spikes lean and sputters. The squirters and cam seem big and have not changed this situation much at all.
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I worked on my timing table a bit yesterday to put a lot more in it at the cruise rpms.
I will upload today and see how she runs.
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The timing seemed to help. The stumble is smaller. I am going to continue to play with the timing a bit to see if I can mitigate it even more.
I added a column in the timing table to have better resolution in the idle/low rpm cruise area.
Old pic:
