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DIY Fuel injection thread.


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@yoeddynz@Roman

https://www.amazon.com/Replacement-Lambda-Wide-Oxygen-Sensor/dp/B07K1SMQYH/ref=sr_1_1_sspa?dchild=1&keywords=bosch+lsu+4.9&qid=1602254839&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyWkhOVUk3NllLU0o2JmVuY3J5cHRlZElkPUEwNDUyMjU0MTZaUjZFQ1RQNjRQNyZlbmNyeXB0ZWRBZElkPUEwODc1OTcwM1BFRldYRkZEMTRaWCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=&tag=dsm0e-20

LSU 4.9 from Amazon, like $51 including shipping and LIFETIME warranty

"Lifetime Warranty - This replacement Oxygen Sensor comes complete with a lifetime warranty. If the part ever fails on your vehicle simply contact us for a replacement. Save time and money and take advantage of our lifetime warranty"

 

Most of the negative reviews were using Innovate controllers

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On 20/01/2021 at 18:15, ajg193 said:

@yoeddynz@Roman

https://www.amazon.com/Replacement-Lambda-Wide-Oxygen-Sensor/dp/B07K1SMQYH/ref=sr_1_1_sspa?dchild=1&keywords=bosch+lsu+4.9&qid=1602254839&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyWkhOVUk3NllLU0o2JmVuY3J5cHRlZElkPUEwNDUyMjU0MTZaUjZFQ1RQNjRQNyZlbmNyeXB0ZWRBZElkPUEwODc1OTcwM1BFRldYRkZEMTRaWCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=&tag=dsm0e-20

LSU 4.9 from Amazon, like $51 including shipping and LIFETIME warranty

"Lifetime Warranty - This replacement Oxygen Sensor comes complete with a lifetime warranty. If the part ever fails on your vehicle simply contact us for a replacement. Save time and money and take advantage of our lifetime warranty"

 

Most of the negative reviews were using Innovate controllers


I've moved on to one of these so I hopefully dont need to worry about blowing up 4.9s anymore. 

https://www.14point7.com/products/spartan-3-adv

Only using the 0-5v output currently but even so, the response time is definitely noticably... quick

But hopefully it goes for ages without blowing up a sensor.

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I think the reason the regular traction control setup uses ignition and fuel cut %, is because it can respond instantly. 
Using something like boost control or e-throttle and there's latency involved and so weird shit can happen.
Plus with the normal traction control you can setup a slip limit, your tyre can put down its best grip while it's slipping at say 10% faster speed than non driven wheels. 

I think the best way to set things like e-throttle angles and boost control, is to control the torque output proactively rather than reactively, then use reactive measures like ign cut to trim it from there.
So develop a table that represents how much power the motor is allowed under different conditions.

I've had some ideas about speed based boost control though, basically you'd build a standardized table that represents how much horsepower the car can put down without wheel slip under "standard conditions" 
Horsepower has a fairly basic relationship against mass air flow so you could have an allowed mass air flow number at a given speed.
So for example to output the same torque amount to the wheels you'd need twice as much HP/air at 200kph than 100kph.
Then the load axis could be a trim pot or some maths channel automagic that perhaps looks at ignition cut % and trims the table up or down if you're wheel spinning too much or not enough.
Then boost control would work by having an "air per cyl estimated" target for a given speed and trim value. 
So "theoretically" if you started wheel spinning at 80kph you could adjust your trim pot and it would rescale the rest of the map to still give you highest torque at the wheels that the car is capable of at each speed

/Just get slicks haha
 

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Also all four wheels can be travelling at different speeds without slip - like when going around a corner. You'd need to account for steering angle if you wanted to know the 'exact' moment of excessive slip initiating.

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Largely a bit technical, only in more recent years with the introduction of stability control does the traction control bother with steering angle, so it can clamp the brake on the individual wheel. Around a corner your combined front wheel speed will be a touch higher than the rear wheels anyway so you can work it no worries. It's not like you're incorporating individual wheel braking or anything.

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On 24/02/2021 at 13:23, Roman said:

I think the reason the regular traction control setup uses ignition and fuel cut %, is because it can respond instantly. 
Using something like boost control or e-throttle and there's latency involved and so weird shit can happen.
Plus with the normal traction control you can setup a slip limit, your tyre can put down its best grip while it's slipping at say 10% faster speed than non driven wheels. 

I think the best way to set things like e-throttle angles and boost control, is to control the torque output proactively rather than reactively, then use reactive measures like ign cut to trim it from there.
So develop a table that represents how much power the motor is allowed under different conditions.

I've had some ideas about speed based boost control though, basically you'd build a standardized table that represents how much horsepower the car can put down without wheel slip under "standard conditions" 
Horsepower has a fairly basic relationship against mass air flow so you could have an allowed mass air flow number at a given speed.
So for example to output the same torque amount to the wheels you'd need twice as much HP/air at 200kph than 100kph.
Then the load axis could be a trim pot or some maths channel automagic that perhaps looks at ignition cut % and trims the table up or down if you're wheel spinning too much or not enough.
Then boost control would work by having an "air per cyl estimated" target for a given speed and trim value. 
So "theoretically" if you started wheel spinning at 80kph you could adjust your trim pot and it would rescale the rest of the map to still give you highest torque at the wheels that the car is capable of at each speed

/Just get slicks haha
 

This is some good food for thought - I've noticed a lot of Emtron users are using a ETB to bleed off boost (I think as a method of boost control)

I'll have to do some further thinking on this

 

 

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