Nice, Im going to set vtec that low to see the advantages. I would also love to see that needle hit 7k
but not with stock internals. i think my pistons would crack.
Another thing, Besides the tuning what aspects of the engine got you to achieve higher hp than tq?
TB bore, higher compression and rev limiter?
That's considerably high for VTEC on an F23. Stock engagement is ~2,300rpm. It's designed for a cleaner and more efficient idle and low rpm cruising. We moved it around between 2k and 3k to see where the smoothest engagement was, and the best results were around 2,800 or so on my setup. Anyone who sets it higher than 3,000 rpm on an F23 is seriously misinformed and losing lots of potential in the mid-low rpm range.
We only set the rev limit that high because it made power that high. If the engine stopped making power at 5,500rpm, we probably would have set it to 6,000. It's completely dependent on where the motor makes power; there is absolutely no reason to rev these engines to 8,000 like I've seen some do when their power drops like a rock after 6,000.
The power band here is mostly influenced by the size of the exhaust turbine and higher compression. The throttle body is less than 60mm, and has almost nothing to do with power gains. A larger throttle body is primarily for throttle response. Just another false truth that Accord guys spread, just like throttle body spacers. Ignition timing also plays a role in how high the engine makes power. The better an engine responds to ignition, the more power you can make up top. That depends a lot on the competency of your tuner, but little things help too like the ceramic coated pistons to prevent detonation, proper spray pattern from quality injectors, and a free-flowing exhaust manifold to help gasses escape and prevent reversion.
Everyone thinks I did something super special here, but the reality is that I saved money in places where OEM parts work just fine (fuel rail, ignition, head, cam, etc) and put that money towards quality injectors, a good manifold, proper machine work, and a dozen other details that made this build what it is.
it's amazing to see an f23 with more than 400hp !
very good work indeed. It'll be a blast in Europe!
more Q's! what did you set your cam gear to? substantial power increase with it?
