resonator removal

I don't think you want to do this. The atkinson cycle engine may need this for proper breathing.

Nate

 

<div class='quotetop'>QUOTE(naterprius @ Apr 11 2006, 04:30 PM) [snapback]238227[/snapback]</div>

Doubtful. Resonators are used for NVH control 99% of the time.

 

Em, I'm curious. Why do you want to remove it?

 

Usually the resonators reduce the flow which often reduces the power... That's why I suppose.

 

Combine your resonator removal with a K&N filter and you should feel more power instantly.

The resonator is used SOLELY to reduce air intake charge noise. You won't create any adverse affects by doing this. Just better response and efficiency.

 

on a 76 HP engine what is your percentage of power gain? 1%? less than 1%?

<div class='quotetop'>QUOTE(Screwdriver @ Apr 17 2006, 03:19 PM) [snapback]241122[/snapback]</div>

only on inline resonators. Have look at the Prius. it's added to the air box and it doesn't flow thru it.

 

<div class='quotetop'>QUOTE(Frank Hudon @ Apr 17 2006, 06:47 PM) [snapback]241141[/snapback]</div>

No, it would still be the same as on other cars. If it's 10% on a Chevy, 10% on a Ford, and 10% on a BMW, then it would still be 10% on a Toyota. The perentage wouldn't necessarily vary, it's the total hp gained. So if you gain 10% on a 400 hp engine, that's 40 more hp. On our little motor, 10% is only 7 hp. But it's still 10%.

 

<div class='quotetop'>QUOTE(DocVijay @ Apr 17 2006, 04:19 PM) [snapback]241161[/snapback]</div>

it still doesn't flow thru the resonator which is the big hp killer. On the Prius it's just off the bottom of the air intake to the air cleaner.

 

Don't expect anything more than 1hp, maybe 2 with the K&N and minus the resonator.

Most Prius owners are obsessed with efficiency, this is just another step in that direction. Obviously, the most benefit would be felt during highway passing.

 

Expect *NOTHING* in terms of HP gains on a Prius- the tiny displacement engine with its Atkinson cycle intake means that the engine is *NOT* intake restriction challenged.. It doesn't even need 300 CFM airflow at max RPM, so even completely removing the airbox (assuming that's something that you wanted to do), wouldn't help the Prius with horsepower...

 

Wouldn't this decrease the MPG? My last two vehicles where it was popular to do the K&N FIPK's, MPG was decreased 1-3 mpg.

 

In the process of fooling with warm-air intakes and all, at this
point I'm running around with the intake hose simply disconnected
and tucked back behind the headlight. I maybe hear a little more
intake noise from the airbox, but there seem to be no differences
plus or minus on mileage. Finally changing the air filter, on the
other hand, may have had a nice side-effect...
.
_H*

 

With the Atkinson coupled with the PSD, these mods are nearly useless. Total power in KW is monitored by the HV ECU and governed. For the most part adding power to the ICE will simply charge the battery quicker, until you reach approximately 60 mph when full engine power is routed to the wheels under WOT. For uphill climbs at WOT you may be able to keep the battery charged an extra few seconds before apparent depletion (40%), but adding engine power won't improve straightline acceleration until you reflash the HV ECU with performance software. Some Japanese programmers have worked on some code, but it tends to overheat your battery due to excessive current flow. Lithium ion helps to solve this problem and unleash the potential of all 400 ftlbs available in MG1, but don't expect that until '09.

Some guy installed a turbo on his 1st gen Prius, and the performance enhancement was noticed in terms of higher MPG and better climb performance. Here's his link: http://autospeed.drive.com.au/cms/A_2664/article.html

 

FYI adding a K&N air filter made no change in mpg.
Now tuning the intake length to work at say 75mph might work.