We found the problem with my fuel system to be that one of the fuel pumps was dead! So, just as a temporary crutch, to make sure that indeed, that was the only issue at this point, my buddy but a 190lb Subaru pump in place of the dead 255lb Walboro and went to work...
On 15lbs of boost, we made one pull to 4500 rpms, and the car made 712rwhp/769rwtq.... however, we had to cut the run off at that rpm b/c we were running out of fuel... when the other 255 gets in there, it will easily be able to support this boost level... We're guessing that, if let run to redline, the HP number would have been in the area of 780rwhp... So, we pulled back the boost and tuned went for my goal..
On 13lbs of boost, and ONLY 13* of WOT timing, the car made 692rwhp and 702rwtq... The jump in the graph is where the dyno lost the tach signal... (for reference, most guys wiht setups like this are running about 17 or 18* of timing)
However, as awesome as this is, the victory is quite BITTERSWEET... on the way home, i spent most of the ride on the phone, excited about finally having my baby back, and about how rediculous and insane the car was to drive around the street... got to the parkway, gave it one hit, and bam... bad news.... i'm not 100% sure yet, but i believe its the head gaskets... my buddy asked me if the ARP head studs were retorqued after a couple heat cycles and i know they werent... he said he's guessing that's the issue. I used GM MLS head gaskets, and even tho very cheap, they are recommended by 3 out of 4 guys on the LS1Tech Forced Induction forum... they're great gaskets, and cost next to nothing. So, what we're thinking, is that b/c the studs werent retorqued, it eventually lifted the heads under boost, and the coolant going into the exhaust is what made the wideband read lean when i felt the hitch... definitely white smoke pouring outta the damn car tho, and the overflow resevior is about full... The 1 thing that i do feel good about is that when taking the oil fill cap off, there's really no blowby, so i feel pretty confident that the engine is fine....
That's only 1 of about 6 major issues that's been brought to my attention about the original builder's fabrication, but i'll leave that out here... this is about a great accomplishment, even tho quite bittersweet! Once we have good head gaskets and the second walboro fuel pump in there, she'll easily make 800/800 to the wheels... then again, i may opt for bigger injectors, and then THE SKY'S THE LIMIT!!!
Originally Posted by Quik
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