OVTune 3.5L Tacoma Supercharger and Twin Turbo Systems

Hopefully he takes a 10 min beer break soon to give us something to look at for a while. Pictures, videos. Start up. Even a picture of a burn out left behind would be nice.

 

I smell Rotrex

 

It's been said over and over that these engines were designed for top end power. So while a turbo setup would potentially give more low end power, a SC might be better suited for this engine. That coupled with the fact a SC is a simpler, more reliable design and less expensive, I would think it's a better route.

 

I think you are correct

 

I'm going to keep an open mind and wait for results...although my initial sentiment was leaning towards turbo.

Is there an approximate eta for these setups?

 

more the better if fruition is achieved. i would love to look at some dynos of both and decide based on what happens between 1100 & 4000rpm... if it gets that far.

 

Going to assume not until he's ironed out the tuning for the n/a AT and MT 3.5

Once that's finally done and taken care of, he can properly focus on FI R&D

 

I don’t know the fundamental difference between a supercharger and a turbo, but if a supercharger does better down low where we need it, why is there a turbo in the works? Saw something on the monster thread that he’s concerned with 6k+ power output, I just can’t figure out why. Are superchargers harder to make? This truck isn’t a supercar, we need usable power down low.

 

Wow, I'm am now in for when a supercharger gets installed. This is sick! Keep up the good work ovtune!!!!! Tip of the spear here. I will have the money for when your ready guys!

 

Turbo gets the low end power a Supercharger is high end power.
Turbo is powered by exhaust which can spool very fast where as a SC is powered by engine belt so harder the engine is working more power. If you want more low end you want turbo if you want more up top supercharger or bigger turbo. Supercharger is less parts and cheaper setup but turbo is probably more what most of us are looking for.

 

Oh. That’s the opposite of what others are saying, even 5 -10 posts ups in this thread. I guess there are varying opinions.

 

Turbo, no matter the size, takes time to spool and compress air. The smaller, the faster. With a sc if the truck is making power, it is too

 

So, forgive my lack of details, but full information will be available!

So we are of course still developing our turbo kit. But some people are adamantly against the idea of a turbo.
We did manage to get twins fitted. So that's nice.

The supercharger information is "TBD" as of right now. There will be two options, C38-81 and C38-91.
Supercharger kits are expected to be cheaper yes.


As far as power goals. c38-81 produces a "street" friendly gain, while the 91 is 500+HP class. They are relatively silent, efficient, and do not really produce heat. It's like having a bigger displacement engine.


The turbo kit is designed to deliver maximum possible torque straight up from 1500 rpm. Numbers on this is TBD. (Harder to install, more complex system)

 

Didn’t know there was a supercharger in the works, very nice.

 

@Turd Hawg A turbo can be setup to make large gains up high or down low, but it’s difficult to do both. Most are sized to achieve some gains across the power band, with boost usually coming on somewhere between 1500-3000 rpm. No matter how well a turbo is setup there will be some lag when throttle is applied since the exhaust flow drives the boost. You need throttle to increase exhaust flow which increases boost and it takes a small delay to build that pressure on the exhaust side to drive the turbo. Turbos have the advantage of often being more efficient than superchargers since some of the boost they gain is created by wasted energy that would normally push exhaust down the exhaust system. It’s actually completely wrong to say that a Turbo makes its power completely from waste energy. The increased back pressure from the turbine on the exhaust side does require energy to maintain. So there is some parasitic draw, but some of the energy definately comes from waste energy and the energy the boost itself creates cancels out a lot of the parasitic draw of the turbo from increased back pressure.

With a roots supercharger power usually comes on quicker, since the system spins up immediately with the crank RPMs. Often superchargers make boost right from idle which is why they are common on drag racers and anything that needs lots of power right from idle. There is no need for pressure to build up in the exhaust like on a turbo, the boost is created mechanically from the engine. This places a large parasitic draw on the crank, usually almost a third of power gained, however the net increase in energy output from the boost allows for more power to be created than is consumed driving the supercharger. However, since there is a mechanical linkage involved with little waste energy harvested, superchargers tend to be less efficient. Also the speed of rotors in a roots is lower than the turbine in a turbo and less heat is usually produced for the same amount of boost, so failures tend to be less epic and occur less often. Superchargers for that reason often don't require any special water or oil cooling beyond cooling the compressed air before it enters the cylinders.

That all being said it sounds like a centrifugal supercharger is what OVTune will be using, which is actually much like a turbo in how the power comes on and failure rate. It doesn't have as many advantages as a roots blower down low in the rpm band but it is much smaller.

TL;DR All boost creates power and all systems can be sized to make power down low. A roots type supercharger though is naturally easy to make power down low with since it often makes boost the fastest down low with almost no lag.

 

The turbo was likely off my ‘todo’ list due to my fear of the complexity, cost, and effort to install in the garage. The SC however, may have me back in the game. I started googling to see what I could learn and came across this page on the URD website. Ignore the pricing, but what I did find interesting is that they have the taco listed for the C38-31.

Has this always been there, or is it a new addition? Not trying to redirect the thread, just that there’s more info supporting the application to the Taco with OVTuning.

 

Looks more like a list of every engine (toyota) it's suited for.
That's the price of just the unit too, not any of the other required items.

 

Me too. I just know I’d prefer to get 150-200k miles out of this truck and would prefer whichever helps ensure that.

Regarding SCs, do they have a clutch or waste gate or something that can help drop the parasitic loss when you’re not needing the extra power? I’m pretty happy with OvTune right now for daily driving (looking forward to 2.0). But would like that extra oomph for a 4K lb trailer.

I read some of the online descriptions of these SCs, and they are quoting big numbers for 3.5L engines. I don’t want something that’s going to break stuff. Just another solid 50-75 HP to take the stress out of towing. I’m hoping that’s where Mat’s headed, but my guess is he’s thinking somewhere in the 75-125 HP range.

Hoping to buy a nice trailer in the next 2 years, so figure I’ll need to add this to the cost of the trailer.

 

Totally understand that, just excited to see that there’s an alternative solution in the works. Anything that can get me that 50-75 HP with risking breaking stuff right away I’m all for.

 

Happy to see some updates finally.

I imagine you’ll have the same problem as MESO. Soon as something is released it’s sold out in minutes.