M&W's72vette
Well-known member
- Joined
- May 4, 2003
- Messages
- 65
- Location
- Southeast Idaho
- Corvette
- Idaho's only twin turbo big block 72 vette
I finally got to drive my twin turbo project I have been working on every spare second since last november and its great!! I still have some carb tuning to do but it runs pretty good so far. I got it running and cruised around some to check out the fuel system, cooling system, ignition ect. Everything was good so I had it in second gear about 2000 rpm and floored it, at about 3500 the vac/boost guage jumped up to ten lbs boost and at 40 mph or so it totally roasted the tires, drifted sideways and promptly hit the 5400 rev limit. What a rush! This thing never had enough power to even come close to doing that in first gear before. As soon as it hit the rev limiter I let off the gas and heard this wierd whooshing noise and I shut off the key thinking that I had damaged somthing...coasted to a stop and looked everything over and couildnt find anything wrong. Turns out it was the blow off valve on the intake pipe...wierd sounding thing. I made a few more runs after some carb jetting and it pulled even harder. I made a few runs in third gear cruising at 2000 and stomping on it, when the boost comes up it feels like a rocket! You can feel the tires shudder but they dont break loose. I have 7 lb springs in the wastegates so I turned the boost control valve down to see if it was working right and went the wrong way and actually turned it up instead....(still learning how it all works). I had it in third gear again and floored it from about 2000 rpm....when the boost came up, the guage showed 15 lbs and at about 70 mph it roasted the tires again and started drifting sideways and immidately hit the 5400 rev limiter again which allowed it to get traction again. My friend and looked at each other in disbelief....we tried it one more time with the same results. What an animal! I have basically a stock 72 454 engine with a mild comp cam and torker intake, it also has stock pistons, rods, crank ect so I made sure I turned the boost controller the right way this time and am going to keep it under 10 lbs so hopefully the motor will last awhile. I got it back on blocks again fixing a couple of oil leaks and I just recieved the fiberglass sidepipe covers so I can see if I can make the 3 inch exhaust fit under them. I had straight pipes on it so far but its too loud for the street and I got to get some mufflers on it. Here is a pic of it, I used late model ford pickup panel air filters. and a friend made some stainless steel airboxes to fit them. I still have to get the hood on it and build some ducting to feed the filters fresh air from the windshield area. Sure is fun!
Mike
Mike