Stock vs 123 Wheel HP (All-Motor) Dyno Graph

[PETERPOOP]

What exhaust set up were you running for this dyno?


the long-tube header (also midpipe you will provide) and stock axleback? or the header/midpipe with the removal of the stock exhaust (running open exhuast manifold)? or the head/midpipe with the 2.5" exhaust

[at3GG]

i know something went "boom" when you were testing/troubleshooting/enjoying your proto turbo kit....any news on that?

[YarisPR]

Originally Posted by richardholdener

The Xd throttle body is larger than the Yaris but it plugs right in and runs perfectrly on the yaris. Just needs a minute or two to idel down the first time you start it-ECU is not use to having such large throttl eopenings at idle but once this self adjustment takes place right after initial start up-it works perfectly and was worth roughly 2 hp at this power level. Intake will come with flange to accept Xd TB and have adapter plate to neck down for yaris TB.

Any chance u have any pics of the TB installed on the yaris?

[richardholdener]

The Xd TB was installed on the prototype intake-we won't have photos of the new intake until the production piece is ready. Externally, the Xd TB looks the same as the yaris.

Originally Posted by YarisPR

Any chance u have any pics of the TB installed on the yaris?

[PETERPOOP]

can you answer my question about which exhaust setup you were running for this dyno or did i miss it earlier in the post?

i'm hoping it was just the stock exhaust or axleback and not the removal of the stock exhaust.

[richardholdener]

The exhaust run witht he long tube header was a 2.25-inch section of tubing to simulate a free flowing system. We willmake the long tube and mid pipe connect to the stock or after market axle back, but best results will come with 2.25-inch (or larger) exhaust.

Originally Posted by PETERPOOP

can you answer my question about which exhaust setup you were running for this dyno or did i miss it earlier in the post?

i'm hoping it was just the stock exhaust or axleback and not the removal of the stock exhaust.

[PETERPOOP]

thanks!

[4MPG]

Pretty impressive.. dammed near 25 percent increase in power with zero tuning and only boltons.

Is there no way to tune the car other than a complete standalone system? I can defiantly see where your loosing some power to the tune (especially the dips between 4200~ and 5500~).

I have seen (on this forum) where people did piston swaps from other Toyota cars to get a bump in compression, any plans to try this out on your test mule?

[richardholdener]

I am very curious to know how you see where we are losing power due to tuning based on the graph provided. Since there is no evidence of the air/fuel ratio or timing values, how do you know where tuning may improve the power? To answer your question about tuning, we will be employing an FIC on the yaris motor (basically to increase the timing-since air/fuel is near spot on already. No plans on changing compression-the test motor belongs to another forum member and we don't think he will like us tearing his motor apart. BTW-The dips in the curves you are refering to are a function of the resonance waves from the long-tube headers and intake manifold.

Originally Posted by 4MPG

Pretty impressive.. dammed near 25 percent increase in power with zero tuning and only boltons.

Is there no way to tune the car other than a complete standalone system? I can defiantly see where your loosing some power to the tune (especially the dips between 4200~ and 5500~).

I have seen (on this forum) where people did piston swaps from other Toyota cars to get a bump in compression, any plans to try this out on your test mule?

[4MPG]

Originally Posted by richardholdener

I am very curious to know how you see where we are losing power due to tuning based on the graph provided. Since there is no evidence of the air/fuel ratio or timing values, how do you know where tuning may improve the power? To answer your question about tuning, we will be employing an FIC on the yaris motor (basically to increase the timing-since air/fuel is near spot on already. No plans on changing compression-the test motor belongs to another forum member and we don't think he will like us tearing his motor apart. BTW-The dips in the curves you are refering to are a function of the resonance waves from the long-tube headers and intake manifold.

Your seeing these kinds of dips etc due to the headers? The dyno sheets of the before/after of the headers really show some spots (4-5200) where it looked like a tuning issue, as it was present but not as exaggerated on the stock dyno, which I figured was a tuning issue. Its probably alot less important than it looks... on this scale every small change looks like a monster.

[thebarber]

Originally Posted by 4MPG

Your seeing these kinds of dips etc due to the headers? The dyno sheets of the before/after of the headers really show some spots (4-5200) where it looked like a tuning issue, as it was present but not as exaggerated on the stock dyno, which I figured was a tuning issue. Its probably alot less important than it looks... on this scale every small change looks like a monster.

its not really a dip in the dyno, its just a flatter tq curve vs stock.....

[richardholdener]

My point is that the only way to determine if any dips in the power curve (HP or TQ) are caused by "tuning issues" is to compare the dips versus the air/fuel curve or the timing curve. This way you can determine if the dip is caused by a lean or rich mixture or by excessive or insufficient timing. Simply looking at dips in the power curve will not allow to to determine the reason they exist. As indicated previously, the dips in the power curve are caused by resonace tuning offered by the new induction and exhaust, not by air/fuel or timing. We know this because both air/fuel and timing curves remained identical before and after the header and/or intake installation (we always monitor both while dyno testing). This should clear everything up.

Originally Posted by 4MPG

Your seeing these kinds of dips etc due to the headers? The dyno sheets of the before/after of the headers really show some spots (4-5200) where it looked like a tuning issue, as it was present but not as exaggerated on the stock dyno, which I figured was a tuning issue. Its probably alot less important than it looks... on this scale every small change looks like a monster.