Blow through problems

[bigdaddyvu]

I have a turbo charged camaro with a blow through holley 750 dbl pumper. I have or had similar problems with my setup. when you get a holley style carb or have one modified make sure it has neo fill floats or they will collapse under pressure, remove and mill choke, anti blow power valve they like to rip apart under uneven pressure, modified air bleeds, vacuum fittings on all extrenal throttle shafts bushing and having a vaccum line attacted to the plenum ( holley style carbs always leak power at the throttle shafts) special metering block gaskets (rubberize coated style) seal off all unused vacuum fitting with epoxy or solder don't use rubber cabs or vacuum lines with a bolt stuck in it. reduce your primaries and inrichen your secondaries. and mod your metering blocks. or you can buy a carb already setup for blow throughs for atleast 800 bucks. and another thing check the nuts and bolt on the carb they like to loosen up with the hot and cold ( i blew a gasket on my float bowl cuz one bolt was loose)

I also use a aeromotive fuel pressure regulator. with a progressive line signal. run your pressure at least 4 psi and should always be atleast 4psi above boost psi or the boost will push the fuel back into the tank (4 psi @ idle no boost psi to 18 psi of fuel 14 psi of boost)

I use a mallory hyfire vi 685 advance box. it features boost psi retard. beings everyone knows you can't run a advancing dizzy on a boosted engine or detenation occurs (hestitates or popping just before boost). i modified a hei dizzy with a lockout advance and have it set at 24 degrees i use the hyfire feature by using a stock gm map sensor and hooking it up to the plenum now i can retard the timing. basic rule for boosted is for every pound of psi retard the timing a degree or two. and since i have the dizzy solid advance i also use other feature the under 500 rpm to retard timing to get the engine started easier.

if you don't believe me read the book Maxinum Boost by corky bell

i have a 86 z28 junkyard 350 s-10 headers flipped, t-70 turbo, ford power strok intercooler, holley 750 blow through, spohn 8 point roll cage 6 point legal, sub fram, and other misc stuff. 4000 dallors get me going 10.69 @124 mph in a qtr