tooter's next manifold adventure...

[cali yaris]

Can't wait to see.

[Golddeenoh]

how about now?

:D

[tooter]

Ok. Just got back from Harry's shop...

(ta da )

Red: no spacer
Blue: with the tooter I.V spacer





Both runs were done with the same short ram intake, the same air filter, the same stock plastic intake manifold, the same stock throttle body, the same header, and the same axle back exhaust.

The tooter I.V intake manifold spacer was the only change.

This is similar to the results I got with my Tacoma. The I.V spacer lowered the torque peak from 4,100 rpm down to 3,650 rpm as well as fattening up the torque curve a little. Not too bad for just a simple bolt on part.

Just for context, the bone stock torque peak is 4,400 rpm, so the intake, the 4-2-1 header, and the Magnaflow exhaust had already lowered it by 300 rpm. The spacer lowered the peak by another 450 rpm for a total of 750 rpm.

Greg

[WeeYari]

Got a selling price set yet? I couldn't spot mention of $$s in this thread.

[tooter]

Originally Posted by WeeYari

Got a selling price set yet? I couldn't spot mention of $$s in this thread.

Not yet... I just ordered a dozen blocks for the first production run and the shop hasn't gotten back to me yet on the material cost.

From the original concept on November 29th to a dyno tested prototype took only a little over 3 months and that was with the holidays. So if all goes well, I should have finished products ready to ship in another month for a total elapsed time of 4 months from virtual concept to the reality of a finished product ready to sell.

This is the advantage of a microbusiness where just one person calls all the shots.


Greg

[WeeYari]

Originally Posted by tooter

Not yet... I just ordered a dozen blocks for the first production run and the shop hasn't gotten back to me yet on the material cost.

In the meantime, can you source a shipping quote to L0P 1K0 Ontario, Canada? Preferably USPS.

[tooter]

Originally Posted by WeeYari

In the meantime, can you source a shipping quote to L0P 1K0 Ontario, Canada? Preferably USPS.

Sure. The spacer and hardware will fit into a USPS international medium flat rate box which is $42.25. That same box ships domestically for $12.35, so the additional shipping cost to Canada would be $30.

Greg

[tooter]

Originally Posted by WeeYari

Got a selling price set yet? I couldn't spot mention of $$s in this thread.

When they're available they'll be offered for sale at $265 including shipping. The shop still has tooter II.VII Tacoma spacers in the works so the I.V's will be machined once they're completed.



Greg

[Silver Streak]

Bummer great mod, but out of my price range right now. I'm curious Tooter, what do you think the spacer would yield on a bone stock Yaris?

[tooter]

Originally Posted by Silver Streak

Bummer great mod, but out of my price range right now. I'm curious Tooter, what do you think the spacer would yield on a bone stock Yaris?

From the dyno tests I've seen, a stock Yaris makes about 91 horsepower and 91 foot pounds of torque at the wheels.

So extrapolating the results I got with my engine, the spacer would only make about 92 horsepower and 94 foot pounds of torque.

Note on the graph that the peak values for both hardly go up at all with the spacer. The biggest difference is in the profile of the torque curve, and that the torque peak is reached 450 rpm sooner.

[Golddeenoh]

nice .65HP and 3.2lbft torque. now if you can get the production price and kits together.

[tooter]

Originally Posted by Golddeenoh

nice .65HP and 3.2lbft torque. now if you can get the production price and kits together.

I'm working on it right now...
The negligible horsepower increase is only incidental as this was not designed to be a top end high performance accessory. The purpose of this spacer is to make regular daily driving easier because the engine doesn't have to work as hard at low rpms.

And the increased torque peak really isn't all that much either. Most all of the advantage comes from shifting the whole torque curve down lower in the rpm range. So as the two torque curves are climbing, the spacer curve remains above of the baseline curve. This spreads the torque increase over a larger rpm operating range.

This mod is for just regular low rpm daily driving.

Greg

[malibuguy]

Anyway to overlay this with a tooter dyno as well?

Btw madness on the midrange gains!

[tooter]

Originally Posted by malibuguy

Anyway to overlay this with a tooter dyno as well?

Btw madness on the midrange gains!

That's a great idea. I'll see if Harry can do it. I need to talk to him about the chart anyways as the peak numbers don't match up with the line on the chart, so one or the other isn't right.

The tooter manifold with the larger throttle body makes 111 horsepower, so it's graph will be a lot stronger at the top.

It would be run 16 with the plain tooter intake manifold and the 1ZZ throttle body...


...and run 23 with the stock manifold and the tooter I.V spacer.



Longer intake runners making more torque is a sound mechanical principle that worked out really well on my Tacoma, so I figured, heck, why not for the Yaris too?

Greg

[7:34pm]

If you have the resources, you should experiment with different spacer sizes to find the optimum length. I'd be curious to see the different outcomes.

And then run them all on the dyno, on the same day so there is no discrepancy between the variables.

[tooter]

Originally Posted by 7:34pm

If you have the resources, you should experiment with different spacer sizes to find the optimum length. I'd be curious to see the different outcomes.

And then run them all on the dyno, on the same day so there is no discrepancy between the variables.

Sorry, I don't have the time or the resources.

This is just a hobby I do on the side in my free time off of work. Dyno time gets really expensive when your car is on the machine and you're trying to swap out parts. Adding the cost for new CNC programming would make it unpractical to make a bunch of different sizes. Anyways you can simply extrapolate the difference as a one inch spacer would make half the torque as a two inch.

I picked 2 inches because that is the thickest spacer which will work without interfering with the engine peripherals like the oil dipstick tube. The two inch simply drops into place like it belongs there.



Other intake manifold spacers sold like this one for a Toyota Tacoma V6 are usually only a half inch thick...



...while the tooter I.V is like stacking up FOUR of them.





Greg

[WeeYari]

^^

Originally Posted by tooter

Sorry, I don't have the time or the resources.

[Kaotic Lazagna]

I like the bump in torque and where the bumps are in the band.