Full throttle Electric Supercharger Build Thread

[autobrz]

Will the kit have the option to be run with WOT switch completely disabled? I mean, to permanently run in partial throttle mode? I'm wondering if the motor can be run at a speed that can make the system on 100% of the time?

[mid_life_crisis]

Originally Posted by sw20kosh

A supercharger has no such mechanism to "keep the same pressure" in the manifold. A supercharged system that makes 10 psi at sea level would make, for example, 7 psi at high altitude. There is no wastegate to allow the supercharger to work harder to maintain 10 psi.

Some do. If you designed the system to produce the desired boost at altitude, the BOV should dump the excess at sea level.

[DJCarbine]

Interested to see a run from a 5-10mph first gear roll...

[Ingen]

Originally Posted by autobrz

Will the kit have the option to be run with WOT switch completely disabled? I mean, to permanently run in partial throttle mode? I'm wondering if the motor can be run at a speed that can make the system on 100% of the time?

It is my understanding that this would cook your batteries pretty quickly, thus the entire point of a WOT switch - intermittent power to the motor, with time in between for the alternator to recharge the batteries. If you want to run it all the time it truly is more efficient to run it with a belt drive a la vortech than it is to involve the losses and inefficiencies of the alternator, and the charging circuit, and the wire leads from both, and the motor.

[fenton]

Originally Posted by ft_sjo

I assume those videos were just for fun and not meant to prove performance?

Oh ya there is no way a FRS is going to beat a BMW with full exhaust but it gives you and idea.

Sent from my HTC One using Tapatalk 4 Beta

[fenton]

Originally Posted by DJCarbine

Interested to see a run from a 5-10mph first gear roll...

1st gear roll

[ame="http://www.youtube.com/watch?v=fSVG9vtuE_Q&feature="]FRS BRZ vs BMW 135i - YouTube[/ame]

Now everyone else go out in their FRS or BRZ either NA or supercharged and tell me how close you are to a 135i with full exhaust.

I tell you, its miles away. I raced him stock before i got the system and i was 20 car lengths away after 2 gears. It was just destruction.

I'm interested in seeing what the vortech boys can do. So far I haven't seen any comparison.

[fenton]

Forgot round 3
[ame="https://www.youtube.com/watch?v=nLH0WkohMSo&feature=youtube_gdata_player"]Supercharged FRS BRZ vs BMW 135i round 3 - YouTube[/ame]


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[ft_sjo]

So you are comparing performance then? You're comparing one car in 2nd gear, another in 3rd, and conveniently cut the video off as soon as the faster car gets into 4th gear and blows you into last week?

You're discrediting this work pretty quickly........

[brillo]

Fenton,

A couple of questions, I've tried reading through about half the thread but it’s a lot to sift through in one day. Thanks again for doing this, very exciting project and your willingness to share the info as you have as well as be a guinea pig is commendable. Next time I’m in Calgary we should meet up and the beer is on me.

1. What exactly is 80% throttle on your car? 80% isn’t foot to the floor but close? I’ve watched the video’s but its hard to tell if 80% is gunning it in street driving without going to the floor boards or not. How would you describe the feel of the throttle input necessary to get the system to kick in?

2. I read early on a CEL was thrown going ~WOT under 3,000 RPM. What happens for example if you were at a dead stop waiting to turn on to a busy highway feeder road and you gun it? Will that through a CEL?

3. How did you apply throttle with you dyno runs given the ~3,000rpm issue mentioned above?

[fenton]

Originally Posted by ft_sjo

So you are comparing performance then? You're comparing one car in 2nd gear, another in 3rd, and conveniently cut the video off as soon as the faster car gets into 4th gear and blows you into last week?

You're discrediting this work pretty quickly........

There is nothing discrediting about it.... it is what it is. There are two other video's that show him pulling away constantly. I just uploaded one where we both start in first.

Im sorry i dont have very many friends with cars as slow as the FRS so this is all i have to post lol.

We were out having fun and starting the BMW in third at 3000 RPM (peak torque) and the frs in second at 4500 rpm resulted in the funnest video's.

It shows that when taken off gaurd a e supercharged FRS can keep ahead of a $52000 BMW with full exhaust...... for a little bit

Come on we are having fun just take it for what it is

[fenton]

The 135i has infinitely more top end so we knew this would be the result but i promised everyone more video's so im doing the best i can

[Adeets]

Originally Posted by sw20kosh

Superchargers don't make up for altitude. Only turbo's do that because the boost that is entering the motor is tied to a turbo that is controlled by a wastegate that will keep a certain set pressure. This wastegate looks for a certain manifold pressure and tries to maintain it irregardless of what atmospheric pressure you are at.

High altitude has less pressure to begin with so a turbo will spin harder to make, say 10 psi at 6000ft. How does it work harder? The wastegate keeps shut untill manifold pressure reaches the set point. This set point is harder to reach at altitude. This set up would still make 10 psi at sea level, but the turbo wouldn't be working as hard.

A supercharger has no such mechanism to "keep the same pressure" in the manifold. A supercharged system that makes 10 psi at sea level would make, for example, 7 psi at high altitude. There is no wastegate to allow the supercharger to work harder to maintain 10 psi.

You can think about it like this:

A turbo can be made to work harder in order to maintain a set manifold pressure. A belt driven supercharger cannot. A belt driven supercharger works "X amount" and cannot work more than X amount unless you rev higher or change the pulley so that it works X + Y amount.

Ex.
X amount of work = 10 psi at sea level
X amount of work = 7 psi at 6000 ft

Unless you have a waste gated supercharger running higher boost then what you want so it cuts you off at say 9psi that it hits at around 4k rpm, after the waste gate starts opening the back pressure on the supercharger lightens increasing mpg compared to running the supercharger without a waste gate, it also allows the ability to run boost by gear and also an actual flexfuel setup...

All the perks of a turbo with out the spool up time.

I may know someone who's doing this ass soon as he makes his fat ass fit back into his 32" jeans.

[Adeets]

Originally Posted by Ingen

Silly question here but if the cel doesn't hurt anything do you really need a tune? Do you care if it's there? Because tunes are expensive and I have had check engine lights before lol.

CELS inhibit things like cruise control.

[fenton]

Originally Posted by brillo

Fenton,

A couple of questions, I've tried reading through about half the thread but it’s a lot to sift through in one day. Thanks again for doing this, very exciting project and your willingness to share the info as you have as well as be a guinea pig is commendable. Next time I’m in Calgary we should meet up and the beer is on me.

1. What exactly is 80% throttle on your car? 80% isn’t foot to the floor but close? I’ve watched the video’s but its hard to tell if 80% is gunning it in street driving without going to the floor boards or not. How would you describe the feel of the throttle input necessary to get the system to kick in?

2. I read early on a CEL was thrown going ~WOT under 3,000 RPM. What happens for example if you were at a dead stop waiting to turn on to a busy highway feeder road and you gun it? Will that through a CEL?

3. How did you apply throttle with you dyno runs given the ~3,000rpm issue mentioned above?

1. 80 percent throttle is 80 percent to the floor.... which is = to 100% throttle body open. So you can basically drive the car Full throttle NA and then push the throttle 10% more(past the switch) and get the supercharged power. It has never kicked in when i didnt want to it. When i want to pass someone i go WOT and it engages instantly.

2. It isnt just going wot under 3000 rpm. If you go wot in 4th to 6th gear between 3000 and 4000 the CEL will come on indicating MAP out of range or something like that. If you gun it at 1000 rpm(dont know why you would do this) it will go very rich and probably bog. In first gear you are out of that range within seconds..... even after you feather the clutch to get going you usually are at 2000 and it works just fine.

The one thing that i found was i had a crap start once and bogged it(almost stalled) and then went full thorttle to try and get up to speed and it just kind of bucked and bogged. You have to think of it this way, almost no other form of Forced induction can give 4 to 5 psi of boost(sans PD) at 1000 rpm..... there is so much load on the engine at that RPM that it pushes the ECU outside of its known fuel and load tables resulting in rich AFR.

It really isnt a problem at all, only ran into it once as i mentioned.

3. For the dyno on the stock tune we just started at 3200 rpm and it recorded the run fine. It still gets a CEL but the run produced safe AFR's and good power.

Once we tuned we were starting at about 2300 RPM and it has happy to do that all day long without throwing a code. I really recommend a tune for this product.

Hope that helps, keep the questions coming, im the Guinea pig and have had the system for over 5000km now!