tooter's next manifold adventure...

[RJay]

Looks nice, and I estimate the tacoma runs a bit smoother and lazyer with the 2 inch?

Still that is a pretty flat torque curve to start with.

[tooter]

Originally Posted by RJay

Looks nice, and I estimate the tacoma runs a bit smoother and lazyer with the 2 inch?

Still that is a pretty flat torque curve to start with.

Yes it's very flat. The Tacoma is a slow turning low end torque industrial engine. The redline is only 5,600 rpm and there isn't much over 4,000 rpm.

The dyno charts don't show it but the truck pulls like a tractor right from idle and even below. I measured the slope of my driveway with an inclinometer and it's 12 degrees. My fully loaded truck climbs right up it even down to only 500 rpm without stalling. It vibrates just like a tractor engine. If you've ever driven a tractor, you'll know exactly what I'm talking about. I live and work in a steep canyon and am always crawling up and down the hills in first gear, so this spacer exactly suits my own needs.

Here's the dyno run with the tooter spacer. All the sound is the intake because the exhaust was stock when I ran it.
http://www.youtube.com/watch?v=H6ofUy8_-6Q

And an acceleration run, same spacer, stock exhaust.

http://www.youtube.com/watch?v=hvIBURPwtXw


Greg

[tooter]

Here's the prototype on the manifold...



It doubles the length of straight runner section before entering the head as well as adding a little more volume to the manifold.



This with the spacer on the engine. Installation is stupid easy. There's tons of clearance everywhere, and even the oil dipstick tube fit perfectly. You can hardly tell it's there because it's covered up by the fuel rail and the wiring loom.



With the cover on, it's literally invisible. I bet it wouldn't even be noticed on a smog test.



I drove it around today, but couldn't really tell any difference, because I'm so used to driving the tooter ET manifold and the larger Corolla throttle body. So that was giving up a lot of advantages. Still it ran good with no issues. I had disconnected the battery so that the ECU could adjust back to the different stock manifold, the different throttle body, and to the spacer as well. All three being changed at exactly the same time caused the ECU hunt around for quite a while trying to figure out the right idle. But it eventually stabilized and the engine runs just fine.

I'll see about dyno runs this week, if I can find the time.


Greg

[JustDidIt]

Originally Posted by tooter

Here's the prototype on the manifold...





Greg

Originally Posted by tooter

The tooters are done...





$265 including shipping

Greg

I'm really thinking about pulling the trigger on this and trying it on my 1NZ-FXE.. Should bolt right up.

[tooter]

Originally Posted by JustDidIt

I'm really thinking about pulling the trigger on this and trying it on my 1NZ-FXE.. Should bolt right up.

If your intake manifold looks like this...



I have no idea as to the spacer's effect on your engine...

However, it would be an interesting experiment because you have an Atkinson cycle engine and not an Otto. You'd also need at least 3 inches of free space in front of the intake manifold for the spacer to fit. From the drastically shallow design of that manifold it looks like free space might be at a premium. But I don't know your under the hood situation. Can you post a pic of the space in front of your intake manifold? Then you can go from there. Don't get one without first finding out if it would even fit.

Greg

[JustDidIt]

Originally Posted by tooter

If your intake manifold looks like this...



I have no idea as to the spacer's effect on your engine...

However, it would be an interesting experiment because you have an Atkinson cycle engine and not an Otto. You'd also need at least 3 inches of free space in front of the intake manifold for the spacer to fit. From the drastically shallow design of that manifold it looks like free space might be at a premium. But I don't know your under the hood situation. Can you post a pic of the space in front of your intake manifold? Then you can go from there. Don't get one without first finding out if it would even fit.

Greg

My 1NZ-FXE

[tooter]

Originally Posted by JustDidIt

My 1NZ-FXE

Hey wait a minute... that intake doesn't look stock. Did you make a custom CAI for it?

There's an experiment you can try...
Unbolt the 5 bolts holding the intake manifold, yank all the hoses and put them out of the way, and then measure how far away from the head you can pull the manifold before anything hits the plastic reservoir of anything else in front of the engine. That will let you know whether or not a spacer will work. To me it looks tight in there, but it's hard to tell from pics. You'd know better than anyone else because you're right there.

Greg

[CrankyOldMan]

Originally Posted by JustDidIt

I'm really thinking about pulling the trigger on this and trying it on my 1NZ-FXE.. Should bolt right up.

DOOOO EEEET! Dyno runs or it didn't happen!

[tooter]

The only issue I can see is that very strange 1-2-4 (opposite of a 4-2-1 tri y exhaust manifold) intake manifold is specifically designed for an Atkinson cycle engine and is tuned for a very specific optimal rpm range. So an intake manifold spacer lengthening those extremely short intake runners is likely to push the curve outside that range. While there's a chance it might make it better, there's a greater chance of making it worse.


Greg