Hello everyone, I recently just inherited my grandfathers LS430, and I was curious what restricts power the most for it. Im not doing this for the power gains but instead to let the engine flow more freely and not be restricted as much. For example on my 89 Toyota pickup the header restricts it the most, and a lot (the gain is 10-15% more hp and a small amount of torque with an aftermarket header, even with the stock exhaust.). So I was curious is it the header? Exhaust? Air intake? Throttle body? Or something small like getting a better air intake filter.
I just want to help it breathe better and not be as restricted to make it happier.
Thank you for any help.

 

Don't try to make it what's it's not.

 

The oem airbox is the best you can get for an intake, the stock exhuast manifolds are incredibly restrictive followed by the rest of the exhaust system. PPE headers are $1300-$2000 they will give you 20 hp 20tq on a stock ecu. You will have to have a custom exhaust system made there is no bolt on aftermarket available.

 

Did you even read what I said? I do not care about making more power, I want to help the engine by not restricting it as much. Yes this usually leads to more power but that is not my goal. I'd be happy to loose 5-15hp/tq if it helped not restrict the engine as much and made the engine happier that it can breathe better. This is almost never the case when letting an engine breathe more but like I said, power is not the goal.

 

Why do you want less restriction? what is the benefit? The engine is carefully designed and very reliable.

 

Toyota reputedly spent $400 Million to develop the LS430 motor. Monkey with it if you want, but I wouldn't.

 

As the man said, " if it's not broke then why fix it?"

 

you can't make more horsepower on the 3uz without tuning it. The only way to make more power is forced induction and tuning

 

What is the number? Like $500 million 1980s dollars that Toyota spent to develop the UZ engine?

Unless the developer of the aftermarket engine parts spent $5,000,000.01 or more, I would not give their product much value.

There is some guy on YouTube that bolted a supercharger on an LS430. You could tinker and experiment with a high miles/beater example to see where the trail leads you. Toyota could have probably cracked 300 HP in 1998 when they went to variable valve timing and coil on plug but they picked durability and reliability.

 

A good general rule is to trust the engineers. Yes, I am an engineer.

 

Alright, thank you all, I know (obviously) manufacturers dump tons of money into creating their engines but I didn't realize it was that much and it sounds like nothing would help it out because its just fine the way it is. I was more thinking along the lines of stuff that they do for emissions which restricts the engine from breathing and being happier.

 

Vehicles are designed to work with the mandated emissions equipment and probably throw a code if taken off. Also if in your state it has to be inspected a visual look is supposed to be done to make sure equipment is still there.

 

As I stated above hp can be gained from aftermarket exhaust, headers ecu tune etc. They are 100% more efficient than stock equipment. If you leave the primary cats it still passes emissions inspections. People are saying leave it alone because they like the 430 for what it is a great riding car.

I personally have 3 430's two stock and one I am putting a harrop super charger on with headers full suspension etc. It all depends on what you are going for if you want a slight bump in power get a quantum auto ecu tune. That updates the transmission, fuel maps etc while leaving the car stock. If you still want it quite get PPE headers, quantum auto ecu tune and keep the stock exhaust.

I cannot stress this enough the two primary cars have almost 0 effect on power or exhaust flow so leave them on the car.

 

correct me if im wrong but i thought they did crack 300hp/310 tq with the 1uzfe when the 2gs debuted in 1997 for the 98 model year. I had a 2gs with a 3uz and it supposedly made 300hp, 330tq...to the crank obviously

 

Throw a tune on it, drops you to just under 6 sec 0-60 and a 14.6 1/4 mile. Anything past that just a supercharger on it