![]() ![]() This is heads (maybe 0.2 under stock SCR), cam, 9psi from TTi X twin turbo setup and again, Alkycontrol methanol. On the last pass where he launches in boost, he sees he's way out on the 10.0 race car in the other lane so he brakes but still runs under. This link goes to a 44 MB video (right click and save-as) of a twin turbo C5 with a stock bottom end doing his first shakedown runs (no boost launches until the end) but was actually done during a race day. The day he ran the pass below, I think he got in right at 20 runs at that track rental alone. It's been ticking for 4-5 years now and literally hundreds of dragstrip passes. Many internet racers have said this is a ticking time bomb. A 9-second totally stock engine, six-speed Vette with no weight reduction. Combined with the driver, this is a record car. ![]() The Vette on the front of my website has a 100% factory stock LS6 never had valve covers off of it, 10.5:1 SCR, long tube headers, D1sc Procharger, about 13psi. It is also pump gas and Alkycontrol meth kit. I have another local customer with a stock cube forged LS1 (well 347"), AFR 205s and a mid 230s duration cam and D1sc Procharger make 763rwhp at about 16psi, roughly 10:1 SCR. All of these numbers are pump gas and Alkycontrol methanol injection. The blower now makes 13.5psi and over 700rwhp through a hefty dyno-unfriendly 4l80. It was beat on like this for a year + before moving to a built 408 ETP 245s. The car made 643rwhp at 67-6800 RPMs where I lifted, but it was still headed straight up. I had a local with a set of AFRs milled to 59-60cc (SCR over 11:1), g5x3 on a 114LSA, big ole F1c Procharger and with a the biggest blower pulley available, it still made 9psi. If you even think about trying to push the timing or mixture though, you can flush it in a heartbeat. He also has a very good book out.Hope this helps.You can run compression and boost with a stock bottom end the tuning just has to be good. Your cam should be ok but I think you will just end up breaking parts if you try to run 11-1 and 6lbs on a stock bottom end.If you really want to learn something check out this man has been building turbo cars longer than most of us have been around. Just so you know people are putting some nasty budget build 370 cubic inch motors together for boost IMO you would be better off running the 70 cc head and 10-12 lbs of boost(or more) versus a 61cc and risking 6 lbs every time you nail it,the cam isnt going to be perfect but it will work ![]() I'm contemplating using the 61cc 215 Trickflows and 226 cam I have on the shelf for a mild street setup.I think you could get away with it,but you will always be riding the edge of boom.You will have to have race gas Im sure to keep from pulling alot of timing.Why not get a set of 70cc heads? I don't want to spend 20 grand building a motor to hold 30 lbs of boost and use e85. Will a 226 cam have enough overlap to make 11.0 to 1 compression ratio usable w/6 lbs of boost without have to run excessively rich and backing way off the timing to keep it from detonation? Almost anything will live with 5 degrees of timing and afr of 10:1. I realize we need adequate fuel, tuning, and turbos work, etc. Will a 226 cam reduce dynamic compression ratio enough to run 6 lbs of boost without pulling lots of timing (to keep it safe enough to keep away from detonation). ![]()
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