Full throttle Electric Supercharger Build Thread

[Target70]

Originally Posted by fenton

Ya that was a edge case. Under normal condition you will never engage that low.

Yes the controller can be programmed by Rob to come on slower but that wrecks all the fun of the ESCs instant boost.

I am not talking about much slower, maybe .25 seconds. Just an initial pulse on engagement, then a very short pause for the ecu to adjust then the compressor back on full.. because maybe if I am crusing along at 40mph in 6th, I want to be able to punch it to block some guy who is trying to cut me off, without having to race him, or downshift.

[fenton]

Originally Posted by Target70

I am not talking about much slower, maybe .25 seconds. Just an initial pulse on engagement, then a very short pause for the ecu to adjust then the compressor back on full.. because maybe if I am crusing along at 40mph in 6th, I want to be able to punch it to block some guy who is trying to cut me off, without having to race him, or downshift.

If you are hitting it at 40mph in 6th .25 seconds won't help I don't think.

The ecu does a fine job of compensating quickly....shiv just needs to get the tune dialed in so it doesn't spike lean as much.... There is some sort of transition at 3000 rpm that is taking to long to richen from.

If you look at my datalogs mine spikes just a bit but then its super rich...things probably need to just be dialed in or I need a custom tune at my altitude.

[fenton]

Originally Posted by Boofneenee

why does it stall? I thought it would just run really lean. Perhaps the lack of fuel while at 0% throttle and incoming 02 causes it to stall? Is this what's happening.

No need for a blow off valve has always raised a brow for me. Another question, if the braking for the turbine does not work correctly, like it did in this example, do you think it could create too much boost with nowhere to go? I love this concept and I am really toying with its purchase. Excuse my ignorance I am trying to understand. thx

It will never make more than 5psi....that is the surge limit of the compressor. And thing more and it just makes it way back out through the intake.

The reason it stalls is the throttle is closed and it is forced air for which it has no compensation for at 700rpm. There is no such thing as adding boost at idle so the computer doesn't know what to do with it.

The reason for no blow up is the compressor brakes very fast. As soon as you let off the throttle it stops the compressor and hence no more boost or no more pressure.

You probably could add a bov if you really wanted too although that creates a lot of additions to the tune to make it run right. Then you essentially wouldn't have to run much of a brake at all. Again the key here would be to try and retain stock driveability which would not be a easy task.

Glad you are asking questions. We are all here to help people understand the facts and are super glad when new people are interested

[silent runner]

Originally Posted by fenton

Sorry I have been pretty busy with the new baby. Not many opportunities to just go out for a cruise by myself

I'm down for meeting up sometime though.

Hey congrats! A new "real" baby trumps a car baby thing anytime.

Take your time, if an opportunity comes up lemy know.

[s2d4]

Originally Posted by fenton

There is some sort of transition at 3000 rpm that is taking to long to richen from.

Close loop to Open loop transition.

[Bu-Tang]

http://www.datazap.me/u/bu-tang/15-a...&data=1-6-9-12

woot, hit 4.94PSI

[raven1231]

Originally Posted by Bu-Tang

http://www.datazap.me/u/bu-tang/15-a...&data=1-6-9-12

woot, hit 4.94PSI

Jealous! Lol best I hit is 4.79. I might try another pull for the hell of it now that my 1.5 has been conditioned

[fenton]

Originally Posted by Bu-Tang

http://www.datazap.me/u/bu-tang/15-a...&data=1-6-9-12

woot, hit 4.94PSI

Looking good. How are you liking the 94 octane?

The TQ250 is really damn good at the low RPM. The 300 im running wont hit those numbers but gets about .5 psi more above 6500.

Your AFR's do look better than mine as well.

Did you end up going to Toma's dyno day? We should go for a cruise soon.

[enwave]

What altitude are you guys at? I'm way up around 4200ft, so I sadly don't get quite that much boost


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[fenton]

Originally Posted by enwave

What altitude are you guys at? I'm way up around 4200ft, so I sadly don't get quite that much boost


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3500ft

[Bu-Tang]

Originally Posted by fenton

Looking good. How are you liking the 94 octane?

The TQ250 is really damn good at the low RPM. The 300 im running wont hit those numbers but gets about .5 psi more above 6500.

Your AFR's do look better than mine as well.

Did you end up going to Toma's dyno day? We should go for a cruise soon.

the 94 is pretty good, been running is for 2 tanks now.

I was at the dyno day but it was packed and eventually started pouring out so I took off early!

Yea forsure we need to get out and get some runs in!

[enwave]

I wonder if I have something misconfigured. I'll have to double check logs, but I'm pretty sure I'm only hitting about 3.5psi. Is it possible my half pack isn't functioning correctly? What should my display be reading at full charge? It seems to be draining at a 1.5pack-like speed though...

And I was wrong, I'm at 4500 ft.

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[fenton]

Originally Posted by enwave

I wonder if I have something misconfigured. I'll have to double check logs, but I'm pretty sure I'm only hitting about 3.5psi. Is it possible my half pack isn't functioning correctly? What should my display be reading at full charge? It seems to be draining at a 1.5pack-like speed though...

And I was wrong, I'm at 4500 ft.

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It will drain about the same....the .5 pack just helps stabilize the current draw.

With 1.5 you should see 4 psi at 3000 rpm.....altitude does play a role as well. The key is to really get the pack warmed up. My first boosts of the day are not as strong either.....just keep boosting and the packs will dump more efficiently.

[enwave]

Alright I'm pretty confident that I'm in good shape then. Just took a run and I'm squeezing about 3.5-3.7psi in that range which I'll attribute to altitude and the fact I'm running a 1dump tune.


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