Full throttle Electric Supercharger Build Thread

[SloS14]

Originally Posted by serialk11r

So what? A supercharger that's not spinning still has a giant gap for air to go through.

Compressor wheels have very tight tolerances to the housing. Not enough air for an engine to breath freely. It would be like breathing through a straw

[Toma]

The motor spins semi freely. And the compressor still has an inducer connected to the exducer even when not moving lol.

[ft_sjo]

Originally Posted by SloS14

Compressor wheels have very tight tolerances to the housing. Not enough air for an engine to breath freely. It would be like breathing through a straw

You may not have much relevant experience with turbocharged engines, but I can try and clear something up for you. A lot of engines, particularly those with larger turbochargers, do not spin the turbo until load demands it. Particularly when the oil is cold.

[FT_Monk]

Originally Posted by ft_sjo

You may not have much relevant experience with turbocharged engines, but I can try and clear something up for you. A lot of engines, particularly those with larger turbochargers, do not spin the turbo until load demands it. Particularly when the oil is cold.

My WRX turbo generates light air pressure even at idle. I have a port for water injection and you can feel air pumping out at idle.

[SloS14]

Originally Posted by ft_sjo

You may not have much relevant experience with turbocharged engines, but I can try and clear something up for you. A lot of engines, particularly those with larger turbochargers, do not spin the turbo until load demands it. Particularly when the oil is cold.

I've installed a turbocharger or ten. A stationary compressor wheel is going to be a huge bottleneck cruising down the highway. A stationary car isn't going to require a lot of air to idle or rev.

[Dodzilla]

That seems like a pretty simple issue to work out as long as the alternator can feed the batteries enough current to cover whatever free wheeling/spinning the compressor needs not to be a restriction while cruising. If not, alternator upgrade? This system seems like it could have enough potential to investigate bigger alternator, more batteries, larger compressor etc...

[neutron256]

Originally Posted by Dodzilla

That seems like a pretty simple issue to work out as long as the alternator can feed the batteries enough current to cover whatever free wheeling/spinning the compressor needs not to be a restriction while cruising. If not, alternator upgrade? This system seems like it could have enough potential to investigate bigger alternator, more batteries, larger compressor etc...

It probably could but you'd have to figure out the right speed, which might need to be a variable speed to be efficient.

The other answer as has already been mentioned is a bypass when the compressor is not in use.

Edit:

A centrifugal clutch on the compressor wheel is also a possible solution but again adding to the complexity.

[fenton]

Originally Posted by SloS14

I've installed a turbocharger or ten. A stationary compressor wheel is going to be a huge bottleneck cruising down the highway. A stationary car isn't going to require a lot of air to idle or rev.

Happy to report that fuel mileage is not effected. 5.8 liters per 100km which is right what I got before on long hauls with cruise on.

The new motor controller is in that will detect low pressure and pulse the turbo to maintain atmospheric pressure :-)

That will go on the car this week

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[Robftss]

'Restriction' requires airflow, and enough that the constriction of the compressor creates a delta P. The throttle plate is a variable constrictor and creates all the restriction of airflow up to a certain point. Once the compressor constriction has enough flow it will create a restriction (delta P). Typically, 0-50% TB there is no P drop across the compressor and therefore no restriction. Above 50%... opening the TB slightly more than normal will maintain airflow. There is no loss @ highway cruising speed. From 50% to on set of boost (~80%), partial activation to maintain stock intake slight vacuum can be signalled by the delta P.

[nonicname]

Im gonna guess that this kit is making more power than innovates SC at sea level. Simply because of the lack of parasitic loss.
Their SC kit is Only running 4.5 psi on stage 1.

[fenton]

Originally Posted by nonicname

Im gonna guess that this kit is making more power than innovates SC at sea level. Simply because of the lack of parasitic loss.
Their SC kit is Only running 4.5 psi on stage 1.

If we were at sea level we would have 1 more psi across the band.

One psi that lacks parasitic drag equals more than 20hp from our experience.

I mean we made 30 peak HP with 1.3 psi :-) not to mention 90tq with only 3 psi.

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[brichard0625]

i really want this kit

[continuecrushing]

Originally Posted by FT_Monk

My WRX turbo generates light air pressure even at idle. I have a port for water injection and you can feel air pumping out at idle.

So at idle your boost gauge shows positive pressure? It should be in vacuum.

[carbonBLUE]

Originally Posted by Shutter

So at idle your boost gauge shows positive pressure? It should be in vacuum.

Wrx is fitted with a small turbo stock, a light impeller could produce positive intake pressures even at idle