You always bring this same story up with no actual proof that you did it. If you have all this vast knowledge, why not put it to use and give some advice..? Why not use said knowledge and turbo your own car? Why not post your findings online so others can benefit from it? You can stroke your ego and talk yourself up all you want, but if youre not going to put it to any use, then what good is it?Petros wrote: ↑Wed Sep 29, 2021 5:02 pm
Hey look, no problem, I am not telling not to do it. I am not stopping you. please do not take my comments as being critical., more power to you. Good for you for giving it a try. Seriously. it will be interesting to see your results. I am just sharing some experience so you may be able to benefit from it, so you can perhaps take some precautions to counter what may become troublesome. And I doubt the early lighter connecting rods will be a problem, toyota tends to way over kill the low end (compare the 3a rods to say a similar size honda civic engine, which has more power output). I would not worry about the crank or connecting rods, it is the head that will be the limiting factor I think.
while true I have never put a turbo on a 3ac, I do have some turbocharging design experience. And perhaps you do have more turbo experience than me, I only worked for AirReasrch turbo charger division as an application engineer in 1981-2. we designed turbo systems for production cars in the early 1980's (when I worked there) for all the US, Japanese and European cars that used an AiReaseach turbo system, I designed the systems, the EFI, induction, specified the size of the turbine and compressor (A/r ratio) to optimize performance, and over saw the dyno testing, and mapped the performance, of the preproduction prototype engines. I also published technical articles on the performance of turbo changed engines in academic journals. During that time I also worked for the racing division of Nissan when they ran a factory backed turbo charged 300ZX race car (I assists with the engine development, induction, cooling system and the suspension) from 1978-84 (on and off for different projects). the 300zx race car used a production based 3.0 liter engine that was tweaked with the turbo to put out over 900 hp. that car was undefeated when it was running the IMSA circuit.
what is the extent of turbo charging experience do you have?
The early 3a rods are not only smaller, but they use a size smaller rod bolt. Definitely not as strong as the later ones, nor are they interchangeable. They are a bit smaller width wise, and as my roommate found out, if you do use one, itll chew up the rod bearing and spin it.
Toyota managed to crank out 90-something horse out of a 3a--mind you, it was a twin downdraft carb setup. I bet if all you do is increase the intake size and possibly make a more free-breathing exhaust, you'd gain a good chunk of power.