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HOWTO: E85/98 with high and low boost settings.

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Circuit 1

4 Position switch in the cabin (no flex fuel).

Position 1 E85 High Boost

Position 2 E85 Low Boost

Position 3 98 High Boost

Position 4 98 Low boost

 

Circuit 2:

Uses a rotary potentiometer in the cabin (no flex fuel)

E85 with variable boost (0-100% boost)

98 with variable boost (0- 80% boost or whatever you desire)

 

Circuit 3:

2 position switch in the cabin (utilises the flex fuel kit)

Position 1 Flex fuel with high boost

Position 2 Flex fuel with low boost

 

Circuit 1

Requires a 4 position single pole switch

image.thumb.png.7d7e4b187bec60316e7eae95fdf4d606.png

 

Circuit 2.

Requires a 2 pole 2 position switch and a potentiometer.

image.thumb.png.3cdfc6e1669592ec508c37fa7f40a580.png

 

Circuit 3

Requires a single pole two position switch

USfE9.png

 

 

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image.png

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54 minutes ago, Roland@pcmtec said:

E85/98 with a rotary dial for variable boost.

 

Lemme just ask a stupid question here. Does this mean that you can still have a flex tune but have variable boost?

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On 11/1/2018 at 8:00 PM, Puffwagon said:

 

Lemme just ask a stupid question here. Does this mean that you can still have a flex tune but have variable boost?

No flex. Only e85 or 98. Or you could do flex with a high low boost switch.

Or you can use the flex fuel sensor and use the multi tune via the cruise control buttons to switch boost levels. 

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I did think so but I wanted to be sure.

Flex fuel with high or low boost on a more or less stock pcm is still pretty amazing. What more does the average to slightly crazy car enthusiast need?

You guys are nailing it ?

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10 hours ago, Puffwagon said:

I did think so but I wanted to be sure.

Flex fuel with high or low boost on a more or less stock pcm is still pretty amazing. What more does the average to slightly crazy car enthusiast need?

You guys are nailing it ?

So if we’re using the rear o2 input for the flex fuel, what input gets used for the high/low boost switch?

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36 minutes ago, will15 said:

So if we’re using the rear o2 input for the flex fuel, what input gets used for the high/low boost switch?

You use a single input. See the wiring diagram and blend tables. 

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3 hours ago, Roland@pcmtec said:

You use a single input. See the wiring diagram and blend tables. 

 

3 hours ago, Roland@pcmtec said:

You use a single input. See the wiring diagram and blend tables. 

 

3 hours ago, Roland@pcmtec said:

You use a single input. See the wiring diagram and blend tables. 

What diagram applies to flex fuel with high/low boost switch?

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1 minute ago, will15 said:

What diagram applies to flex fuel with high/low boost switch?

The single pole 4 position switch. It has 4 positions E85 high, E85 low, 98 high, 98 low. You then setup the fuel and boost ramps as per the photo of the whiteboard. I will make up sample tables in the editor shortly.

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I see how to works with e85 or 98 tunes, but if your using flex with the o2 in put of 0 to 1.66 volts, and the ecu needs to see all of the 0 to 1.66 volts, how dose the ecu no if we want high or low boost or do you not use the hole 0 to 1.66 when doing this?

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2 minutes ago, will15 said:

I see how to works with e85 or 98 tunes, but if your using flex with the o2 in put of 0 to 1.66 volts, and the ecu needs to see all of the 0 to 1.66 volts, how dose the ecu no if we want high or low boost or do you not use the hole 0 to 1.66 when doing this?

The two scenarios described wouldn't work with flex.

A third scenario would be to use a flex fuel sensor and a high/low boost switch. I will add a diagram for this as well.

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1 hour ago, will15 said:

I see how to works with e85 or 98 tunes, but if your using flex with the o2 in put of 0 to 1.66 volts, and the ecu needs to see all of the 0 to 1.66 volts, how dose the ecu no if we want high or low boost or do you not use the hole 0 to 1.66 when doing this?

It would be something like 0 to 0.7 v is the low boost and 0.8v to 1.5v would be high boost. So you would divide the resolution. I would then use a 3 pole switch to toggle between the normal flex setup to this. It's a bit tricky to work out the resistor values do I might wait and see if there is any demand for it first. Have to get my old electrical engineering books out to do the maths for the values. 

The alternative is get the can bus input working instead. 

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37 minutes ago, Roland@pcmtec said:

The alternative is get the can bus input working instead. 

That sounds like it will appeal to a larger audience and have a much wider range of uses.

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I just don’t understand how the voltagess are gonna work there would be so many different  scenarios eg

low boost e85

low boost 98

low boost e50, e60, e70

high boost e85, e70, e60

and so on and so on. 

We can do flex fuel and adjust boost/timing compared to  ethanol   Content but now I  assume ?

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42 minutes ago, will15 said:

I just don’t understand how the voltagess are gonna work there would be so many different  scenarios eg

low boost e85

low boost 98

low boost e50, e60, e70

high boost e85, e70, e60

and so on and so on. 

We can do flex fuel and adjust boost/timing compared to  ethanol   Content but now I  assume ?

There are only 3 possible options. Danny Pirrotta will look at building a kit for all 3 including a value file so that people don't have to understand how it works. It will simply "just work".

 

Circuit 1

4 Position switch in the cabin (no flex fuel).

Position 1 E85 High Boost

Position 2 E85 Low Boost

Position 3 98 High Boost

Position 4 98 Low boost

 

Circuit 2:

Uses a rotary potentiometer in the cabin (no flex fuel)

E85 with variable boost (0-100% boost)

98 with variable boost (0- 80% boost or whatever you desire)

 

Circuit 3:

2 position switch in the cabin (utilises the flex fuel kit)

Position 1 Flex fuel with high boost

Position 2 Flex fuel with low boost

 

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1 hour ago, Puffwagon said:

That sounds like it will appeal to a larger audience and have a much wider range of uses.

Yeah right now this is something that will work and only took me half a day to draw up. Can bus will take us a few weeks so its lower priority than the datalogger and the next software update.

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Update. The current uses cases described here are now redundant due to the multi tune. You could however use the same circuits to multiplex in a thermocouple, afr protection via a wideband or a low level switch from a water methanol kit. 

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So, assuming you wanted to just control boost maps, if could be done on the fly? no need to reboot the ECU between a different setting on the dial?

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22 hours ago, FiftyOne said:

So, assuming you wanted to just control boost maps, if could be done on the fly? no need to reboot the ECU between a different setting on the dial?

Yes it could be done instantaneously with an infinite number of boost levels depending on what type of dial you use.

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