I found out some more info about the Turbo Puerto Rico Buick 350: https://www.youtube.com/watch?v=AYGsuwrBkvI It has a 4.10 gear, 29x12 tires, th-350, trans brake, 4100 stall converter, engine is pretty much stock except bored 30 over forged pistons, stock rods, copper o ringed block, stock exhaust manifolds are in place, the car runs 11.20 @120 MPH in the quarter mile. He says he shifts at 7000 RPM and it has been reliable though the different phases of the progression from 14 second quarter miles down to the low 11s. Edit, more info added: He used 1.8 ratio Chrysler rockers, must have been some cool custom work to make that work! In 1990 when he built the engine there was no engine dyno so he could get a naturally aspirated baseline but in 2016 he did a chassis dyno test and got 515 rear wheel HP at 7000 RPM and then 630 HP at 10 PSI.
Got some more info about this setup. He rebuilt is once over 30 years and it all measured out well so it was re assembled with some upgrades. The owner is the manager of a performance shop. The cylinder heads have with larger BBC stainless steel valves, ported, the cams:Custom 116 LSA .495/.500, Duration is 250 and 260 @ .050 solid,The compression ratio is about 10.5.
If the rods and crank are stock and he shifts at 7 grand then he's certainly got a good bottom end in the thing. Good to see it. Jim
Yes he really seems to know his stuff. I think that the reason the stock rods are holding up is because of a razor sharp tune and the fact that turbos are easier on parts vs high compression NA, supercharging or nitrous.
Impressive power and track times:Brow: I wonder what it would do in the 1/4 with less gear, like 3.42 to load the turbos more
It doesn't matter what power adder you put on if it does not get tuned correctly you will burn it up. I saw this in both Turbos and Procharger systems and if you do not follow the guidelines for nitrous you will burn that up too. 12:1 compression is no different either. One does not do better than the other.
It is tough to say... For my car even with the 4.56 gear it builds boost super quick anyways so it would likely slow down with less gearing. For anything that has a large turbo and has trouble getting the boost spooled up the lower numeric gearing does help the engine build boost.
