Will a 05 tundra intake manifold fit a 03 V8 4runner?
- Thread starter bassmacka
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5vzT4R
New member
Not sure where you heard that, but it should not change a thing in HP. The 05+ v8 did not get extra horsepower from different intake manifolds or throttle body's, it got the increase in power from using VVTI, so I'm pretty sure swapping those parts would only waste your money and not your tires. But I've never heard of this before, just going off what I do know.
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Yeah, not sure where that was heard, but I have not discovered that.
More to the answer of your question: it would be unusual if a manifold made for a 4.7 V8 Tundra would fit easily into a V8 4Runner. Now, people have done it, more commonly prior to Doug Thorley releasing their short runner exhaust headers for the V8 4Runners.
The two common problems (as I recall) with the Tundra manifolds were the steering shaft location being different on the 4Runner, and more challenging; the narrower frame configuration.
Unless you REALLY wanted long tubes and wanted to pay a premium to have them heavily modified to fit a 4Runner, it'd be easier to just to put the Doug Thorley's on.
As for the injectors, regardless of the injector size the ECU is still going to fight tooth and nail to attain its programmed A/F ratios. Adding bigger injectors won't change the tuning at all because the ECU is waaaaay smarter than that. It would just run larger injectors as a lower duty cycle. Note that if installed manifolds allowed more air to move, there's plenty of headroom in the stock injectors for a small change like that.
Supposedly the 2UZ-FE ECU is pretty good at figuring out when it's being bamboozled... and send the correction factors of piggy back devices through the roof as the ECU and the piggy-back wrestle for control. Hence, there's very few tuning devices that list the 2UZ-FE as supported... let alone the 4Runner specifically.
The cross over pipe is probably just as detrimental to power as the headers are. However, I noticed a drop in bottom end torque after switching to the Doug Thorleys. I mean, now I make ~80% of peak torque at ~1800RPM instead of... like... idle. Which wasn't that useful anyway.
That is a strange thing to hear. The 03-04 are unique, the 05 is unique and the 06+ is unique. The intake manifold gaskets are a different design in these 3 iterations and it is most likely a waste of time to experiment with swapping any kind of intake parts.
Swapping injectors if you have a supercharger is a good idea, as the computer will be able to run the injectors at less than 100% duty cycle and give you proper AF. However, it doesn't look like you are doing this- it appears that you want to change the injectors without having any power adders installed on the engine. What is the point of doing that? Nothing has changed which would give you more power so why would you need new injectors?
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bassmacka
Member
I am changing the intake and exhaust. Not sure about the new injectors but your are right it would be more of a benefit with forced induction. going from a 4 hole to a 12 hole wont hurt I imagine.
