Tl;Dr: can you tune a v8 for a crap load of power? How much?

Hey guys and gals. I have a weird pipe dream I'd like to share, and I want to know if it's feasible. I'm hoping your combined knowledge and experience will help me out!

First, is it possible to 'tune' the 4.7L? I know I can take my motorcycle and get it tuned at a shop to produce more peak power and torque with just a simple intake, header, exhaust rework.

Second, using the above logic, could I expect to see significant gains from a thorough airflow revamp? We already have a psuedo cold air from the fender, but I could see me running it though a snorkel or even fabbing a hood scoop intake to put it directly in fresh, cold, clean air, while adding in a throttle body spacer, because I'm already that far in, why not.
Removing a set of cats and replacing the remaining set with high flow, along with new headers and appropriately sized Y pipe, and a less restrictive muffler would round this out. I would say dual, but where are you going to run a true x-pipe under there?

Third, and finally, the goal would be a significant increase in power, not just horses. I feel like an appropriate tune bring the 320lb/ft closer to 350lb/ft, and the 270 hp into the the low 300's. (325...? :fingerscrossed: ) This is |guesswork| based on the small differences I've seen claimed across the different, smaller mods without opening up a laptop. I feel like cracking the laptop open will provide that tool, if it's available.

Background:

To be clear, I'm not trying to drag race, and I'm not lacking for power. I just want to have this vehicle at the peak of it's potential.

The unreal version would be dreaming of 350hp and 450lb/ft. I know (feel) that's not doable without a different engine or a forced induction set up. I've already looked into the archive threads here on t4r, and I see two lunatics years ago fit the non-VVTi TRD supercharger into the 2005 Tundras with different approaches, and general success. One used a ninth injector and separate fuel tank, and one got larger injectors and had a guy sit and remap while they drove. I don't have access to that level of expertise, and I don't think that forced induction is the way to go longterm.
However, I feel like letting the engine breath as much and as fast as it can will provide it the best solution for increasing power, without increasing the pressures inside, IF the actual engine maps can be adjusted the same way with natural aspiration.
I've googled tunes, but the V8 engine is lovable adoringly by few and neglected by the masses. It just isn't the focus of the aftermarket community, as far as I can tell.

I'm happy to hear all sides and experiences cause my 2005 V8 is almost finished with restoration. Just needs some cosmetic surgery and it'll be ready to actually start messing with. I'm on tapatalk so forgive my spelling.

Cheers!

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Nope. TRD S/C was only for 03/04 V8s without VVTi.

No other off the shelf options unless you’re ready to drop a ton of money on custom.

Yup. I mentioned that lower down, I've seen way too much effort go into making that work, which is why I have this pipedream.

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The ECU is locked down by Toyota and hasn't been easy/profitable to crack by anybody so gains are minimal. It's not like a turbo Supra where a tune/exhaust/intake can gain you 100whp.

This is the only thread that I know of where someone actually dyno'd their V8 after mods.
http://www.toyota-4runner.org/engine...ip-intake.html

Dollar for horsepower, last time I calculated it, was about the same with NA mods as it was for a supercharger. You can make a lot more HP with the supercharger but it's a linear jump in price. Headers will give you the largest jump in HP but they aren't easy to install. +11 max hp and +18 max tq. You can maybe get +60hp/tq with all the NA mods.

URD makes the one and only supercharger kit (other than discontinued TRD) claiming 100hp/100tq gains on 5.5psi boost.

That was a great read, good info for me to start off of. A 50hp/lb/ft gain would be admirable, especially now that the parts he wanted at the time exist regularly (more regularly) than ten years ago. That thread is ancient.

That makes me 320hp and 370lb/ft, near enough to the dream that I wouldn't mind. Maybe the chips have better programming now as well, not that they can change physics, but they may play with it more.

I really don't like the spool style supercharger, much preferring the rotr... rotrex?( I forgot how to spell it.) and even then I'm pretty sure its only for the V6.

(Wait I think rotrex is spool and I'm a fan of the Twin Scroll, the type that TRD used.)

I'm interested in the items they were describing by item number. That was a fuel air mixture.... what? Override? Adjustment? Anyone have some education on that? I definitely feel I'm on the same vibe as this guy was, but it's much later and the truck is much older. I don't have to worry about it so much, so I think this may begin early next year.

He spent about $1100, I think for $2,000 I can get the gains across the band and peak awlb/ft in the mid 300's.

Anyone else? I'm eager to hear if this is doable and get going, or not and move on to other things, like bumpers or an air compressor.

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Going to give this a bump, one time thing. Anyone have anything to add, or suggest?

I’m definitely interested in seeing what you come up with because as you’ve seen, performance mods for these trucks generally is the main focus on this site. Most go for suspension, tires, lighting, and other mods suited to increase its abilities off-road. I feel like inv4drzm gave a really solid synopsis of what’s available in post #4 though, at least of what’s been tried on here anyway. I’m fortunate in that I have the ‘04 engine (non-vvt), so if I was able to score a TRD supercharger kit, it would bolt right up. By the way, the terms you are looking for when taking Superchargers are centrifugal, and roots. Those are the 2 main types, but then in the roots category it’s broken down into single and twin screw. From what I’ve seen, most OEM superchargers tend to be of the roots type, which leads me to believe they are the most reliable since OEMs have to warranty them. Just as an FYI, I actually have my truck modded with most of the stuff you are talking about already. I have the DT headers with high flow CATs, high flow AFE dry filter, TRD stainless dual exhaust, etc. I do not however have a custom tune, Y-pipe, or throttle body spacer. The TB spacer from reading on here does absolutely nothing for these trucks, and those who tried it claimed it was a total waste of money so I didn’t bother, even though I was intrigued at first. One product that surprised the heck of me though, was the Sprint Booster. I followed threads, and read about for months thinking it had to be one of those snake oil type products similar to most of the “plug in chips” sold as performance enhancers. Much to my surprise, it made the biggest difference in the actual “feel” of any other mod I have! I’m sure it helped unlock the potential of the mods I already have, but either way, it was by far the most noticeable seat of the pants increase. Funny thing is that it doesn’t actually “add” any hp/torque, all it does it remove the throttle lag inherent to drive by wire systems, which the T4R is one of the worst I’ve experienced. So, if you don’t already know about it, I don’t suggest researching and possibly adding that to your list. At under $300, I’d say it’s bang for the buck is better than any other mod I’ve done (and WAY easier to install). Good luck!